drm/ttm/memcg/lru: enable memcg tracking for ttm and amdgpu driver (complete series v3)

drm/ttm/memcg/lru: enable memcg tracking for ttm and amdgpu driver (complete series v3)

[Dave Airlie]

Hi all,

This is a repost with some fixes and cleanups.

I'd really like to land this into drm-next, Maarten posted xe support for this and some other work
and I think we need to start moving this forward in tree as I'm not sure what else I can really do
out of tree.

Differences since last posting:
1. Squashed exports into where they are used (Shakeel)
2. Fixed bug in uncharge path memcg
3. Fixed config bug in the module option.

Differences since 1st posting:
1. Added patch 18: add a module option to allow pooled pages to not be stored in the lru per-memcg
   (Requested by Christian Konig)
2. Converged the naming and stats between vmstat and memcg (Suggested by Shakeel Butt)
3. Cleaned up the charge/uncharge code and some other bits.

Dave.

Original cover letter:
tl;dr: start using list_lru/numa/memcg in GPU driver core and amdgpu driver for now.

This is a complete series of patches, some of which have been sent before and reviewed,
but I want to get the complete picture for others, and try to figure out how best to land this.

There are 3 pieces to this:
01->02: add support for global gpu stat counters (previously posted, patch 2 is newer)
03->06: port ttm pools to list_lru for numa awareness
07->13: add memcg stats + gpu apis, then port ttm pools to memcg aware list_lru and shrinker
14: enable amdgpu to use new functionality.
15: add a module option to turn it all off.

The biggest difference in the memcg code from previously is I discovered what
obj cgroups were designed for and I'm reusing the page/objcg intergration that 
already exists, to avoid reinventing that wheel right now.

There are some igt-gpu-tools tests I've written at:
https://gitlab.freedesktop.org/airlied/igt-gpu-tools/-/tree/amdgpu-cgroups?ref_type=heads

One problem is there are a lot of delayed action, that probably means the testing
needs a bit more robustness, but the tests validate all the basic paths.

Regards,
Dave.

[PATCH 01/15] mm: add gpu active/reclaim per-node stat counters (v2)

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

While discussing memcg intergration with gpu memory allocations,
it was pointed out that there was no numa/system counters for
GPU memory allocations.

With more integrated memory GPU server systems turning up, and
more requirements for memory tracking it seems we should start
closing the gap.

Add two counters to track GPU per-node system memory allocations.

The first is currently allocated to GPU objects, and the second
is for memory that is stored in GPU page pools that can be reclaimed,
by the shrinker.

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

---

v2: add more info to the documentation on this memory.

I'd like to get acks to merge this via the drm tree, if possible,

Dave.
---
 Documentation/filesystems/proc.rst | 8 ++++++++
 drivers/base/node.c                | 5 +++++
 fs/proc/meminfo.c                  | 6 ++++++
 include/linux/mmzone.h             | 2 ++
 mm/show_mem.c                      | 9 +++++++--
 mm/vmstat.c                        | 2 ++
 6 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 2971551b7235..ae0aad28fe7d 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -1095,6 +1095,8 @@ Example output. You may not have all of these fields.
     CmaFree:               0 kB
     Unaccepted:            0 kB
     Balloon:               0 kB
+    GPUActive:             0 kB
+    GPUReclaim:            0 kB
     HugePages_Total:       0
     HugePages_Free:        0
     HugePages_Rsvd:        0
@@ -1275,6 +1277,12 @@ Unaccepted
               Memory that has not been accepted by the guest
 Balloon
               Memory returned to Host by VM Balloon Drivers
+GPUActive
+              System memory allocated to active GPU objects
+GPUReclaim
+              System memory stored in GPU pools for reuse. This memory is not
+              counted in GPUActive. It is shrinker reclaimable memory kept in a reuse
+              pool because it has non-standard page table attributes, like WC or UC.
 HugePages_Total, HugePages_Free, HugePages_Rsvd, HugePages_Surp, Hugepagesize, Hugetlb
               See Documentation/admin-guide/mm/hugetlbpage.rst.
 DirectMap4k, DirectMap2M, DirectMap1G
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 3399594136b2..b2fa9d55666d 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -485,6 +485,8 @@ static ssize_t node_read_meminfo(struct device *dev,
 #ifdef CONFIG_UNACCEPTED_MEMORY
 			     "Node %d Unaccepted:     %8lu kB\n"
 #endif
+			     "Node %d GPUActive:      %8lu kB\n"
+			     "Node %d GPUReclaim:     %8lu kB\n"
 			     ,
 			     nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
 			     nid, K(node_page_state(pgdat, NR_WRITEBACK)),
@@ -518,6 +520,9 @@ static ssize_t node_read_meminfo(struct device *dev,
 			     ,
 			     nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED))
 #endif
+			     ,
+			     nid, K(node_page_state(pgdat, NR_GPU_ACTIVE)),
+			     nid, K(node_page_state(pgdat, NR_GPU_RECLAIM))
 			    );
 	len += hugetlb_report_node_meminfo(buf, len, nid);
 	return len;
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index a458f1e112fd..65ba49ec3a63 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -163,6 +163,12 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 	show_val_kb(m, "Balloon:        ",
 		    global_node_page_state(NR_BALLOON_PAGES));
 
+	show_val_kb(m, "GPUActive:      ",
+		    global_node_page_state(NR_GPU_ACTIVE));
+
+	show_val_kb(m, "GPUReclaim:     ",
+		    global_node_page_state(NR_GPU_RECLAIM));
+
 	hugetlb_report_meminfo(m);
 
 	arch_report_meminfo(m);
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 0c5da9141983..12f1b872f40f 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -245,6 +245,8 @@ enum node_stat_item {
 	NR_HUGETLB,
 #endif
 	NR_BALLOON_PAGES,
+	NR_GPU_ACTIVE,          /* Pages assigned to GPU objects */
+	NR_GPU_RECLAIM,         /* Pages in shrinkable GPU pools */
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/mm/show_mem.c b/mm/show_mem.c
index 41999e94a56d..e63cc4e0f419 100644
--- a/mm/show_mem.c
+++ b/mm/show_mem.c
@@ -254,7 +254,9 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z
 			" sec_pagetables:%lukB"
 			" all_unreclaimable? %s"
 			" Balloon:%lukB"
-			"\n",
+		        " gpu_active:%lukB"
+		        " gpu_reclaim:%lukB"
+		        "\n",
 			pgdat->node_id,
 			K(node_page_state(pgdat, NR_ACTIVE_ANON)),
 			K(node_page_state(pgdat, NR_INACTIVE_ANON)),
@@ -279,7 +281,10 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z
 			K(node_page_state(pgdat, NR_PAGETABLE)),
 			K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)),
 			str_yes_no(pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES),
-			K(node_page_state(pgdat, NR_BALLOON_PAGES)));
+		        K(node_page_state(pgdat, NR_BALLOON_PAGES)),
+		        K(node_page_state(pgdat, NR_GPU_ACTIVE)),
+			K(node_page_state(pgdat, NR_GPU_RECLAIM)));
+
 	}
 
 	for_each_populated_zone(zone) {
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 71cd1ceba191..8c95b731e723 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1289,6 +1289,8 @@ const char * const vmstat_text[] = {
 	[I(NR_HUGETLB)]				= "nr_hugetlb",
 #endif
 	[I(NR_BALLOON_PAGES)]			= "nr_balloon_pages",
+	[I(NR_GPU_ACTIVE)]			= "nr_gpu_active",
+	[I(NR_GPU_RECLAIM)]			= "nr_gpu_reclaim",
 #undef I
 
 	/* system-wide enum vm_stat_item counters */
-- 
2.50.1

[PATCH 02/15] drm/ttm: use gpu mm stats to track gpu memory allocations. (v4)

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This uses the newly introduced per-node gpu tracking stats,
to track GPU memory allocated via TTM and reclaimable memory in
the TTM page pools.

These stats will be useful later for system information and
later when mem cgroups are integrated.

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

---
v2: add reclaim parameters and adjust the right counters.
v3: drop the nid helper and get it from page.
v4: use mod_lruvec_page_state (Shakeel)
---
 drivers/gpu/drm/ttm/ttm_pool.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index baf27c70a419..148c7530738d 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -150,8 +150,10 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
 
 	if (!pool->use_dma_alloc) {
 		p = alloc_pages_node(pool->nid, gfp_flags, order);
-		if (p)
+		if (p) {
 			p->private = order;
+			mod_lruvec_page_state(p, NR_GPU_ACTIVE, 1 << order);
+		}
 		return p;
 	}
 
@@ -186,7 +188,7 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
 
 /* Reset the caching and pages of size 1 << order */
 static void ttm_pool_free_page(struct ttm_pool *pool, enum ttm_caching caching,
-			       unsigned int order, struct page *p)
+			       unsigned int order, struct page *p, bool reclaim)
 {
 	unsigned long attr = DMA_ATTR_FORCE_CONTIGUOUS;
 	struct ttm_pool_dma *dma;
@@ -201,6 +203,8 @@ static void ttm_pool_free_page(struct ttm_pool *pool, enum ttm_caching caching,
 #endif
 
 	if (!pool || !pool->use_dma_alloc) {
+		mod_lruvec_page_state(p, reclaim ? NR_GPU_RECLAIM : NR_GPU_ACTIVE,
+				      -(1 << order));
 		__free_pages(p, order);
 		return;
 	}
@@ -288,6 +292,9 @@ static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p)
 	list_add(&p->lru, &pt->pages);
 	spin_unlock(&pt->lock);
 	atomic_long_add(1 << pt->order, &allocated_pages);
+
+	mod_lruvec_page_state(p, NR_GPU_ACTIVE, -num_pages);
+	mod_lruvec_page_state(p, NR_GPU_RECLAIM, num_pages);
 }
 
 /* Take pages from a specific pool_type, return NULL when nothing available */
@@ -299,6 +306,8 @@ static struct page *ttm_pool_type_take(struct ttm_pool_type *pt)
 	p = list_first_entry_or_null(&pt->pages, typeof(*p), lru);
 	if (p) {
 		atomic_long_sub(1 << pt->order, &allocated_pages);
+		mod_lruvec_page_state(p, NR_GPU_ACTIVE, (1 << pt->order));
+		mod_lruvec_page_state(p, NR_GPU_RECLAIM, -(1 << pt->order));
 		list_del(&p->lru);
 	}
 	spin_unlock(&pt->lock);
@@ -331,7 +340,7 @@ static void ttm_pool_type_fini(struct ttm_pool_type *pt)
 	spin_unlock(&shrinker_lock);
 
 	while ((p = ttm_pool_type_take(pt)))
-		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p);
+		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p, true);
 }
 
 /* Return the pool_type to use for the given caching and order */
@@ -383,7 +392,7 @@ static unsigned int ttm_pool_shrink(void)
 
 	p = ttm_pool_type_take(pt);
 	if (p) {
-		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p);
+		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p, true);
 		num_pages = 1 << pt->order;
 	} else {
 		num_pages = 0;
@@ -475,7 +484,7 @@ static pgoff_t ttm_pool_unmap_and_free(struct ttm_pool *pool, struct page *page,
 	if (pt)
 		ttm_pool_type_give(pt, page);
 	else
-		ttm_pool_free_page(pool, caching, order, page);
+		ttm_pool_free_page(pool, caching, order, page, false);
 
 	return nr;
 }
@@ -780,7 +789,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 	return 0;
 
 error_free_page:
-	ttm_pool_free_page(pool, page_caching, order, p);
+	ttm_pool_free_page(pool, page_caching, order, p, false);
 
 error_free_all:
 	if (tt->restore)
-- 
2.50.1

[PATCH 03/15] ttm/pool: port to list_lru. (v2)

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This is an initial port of the TTM pools for
write combined and uncached pages to use the list_lru.

This makes the pool's more NUMA aware and avoids
needing separate NUMA pools (later commit enables this).

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

---
v2: drop the pt->lock, lru list has it's own lock which is sufficent.
rearrange list isolates to fix bad locking orders.
---
 drivers/gpu/drm/ttm/tests/ttm_device_test.c |  2 +-
 drivers/gpu/drm/ttm/tests/ttm_pool_test.c   | 32 ++++----
 drivers/gpu/drm/ttm/ttm_pool.c              | 91 ++++++++++++++-------
 include/drm/ttm/ttm_pool.h                  |  6 +-
 mm/list_lru.c                               |  1 +
 5 files changed, 82 insertions(+), 50 deletions(-)

diff --git a/drivers/gpu/drm/ttm/tests/ttm_device_test.c b/drivers/gpu/drm/ttm/tests/ttm_device_test.c
index 1621903818e5..1f207fd222bc 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_device_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_device_test.c
@@ -183,7 +183,7 @@ static void ttm_device_init_pools(struct kunit *test)
 
 				if (params->use_dma_alloc)
 					KUNIT_ASSERT_FALSE(test,
-							   list_empty(&pt.pages));
+							   !list_lru_count(&pt.pages));
 			}
 		}
 	}
diff --git a/drivers/gpu/drm/ttm/tests/ttm_pool_test.c b/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
index 8ade53371f72..39234a3e98c4 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
@@ -248,7 +248,7 @@ static void ttm_pool_alloc_order_caching_match(struct kunit *test)
 	pool = ttm_pool_pre_populated(test, size, caching);
 
 	pt = &pool->caching[caching].orders[order];
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt->pages));
 
 	tt = ttm_tt_kunit_init(test, 0, caching, size);
 	KUNIT_ASSERT_NOT_NULL(test, tt);
@@ -256,7 +256,7 @@ static void ttm_pool_alloc_order_caching_match(struct kunit *test)
 	err = ttm_pool_alloc(pool, tt, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
-	KUNIT_ASSERT_TRUE(test, list_empty(&pt->pages));
+	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt->pages));
 
 	ttm_pool_free(pool, tt);
 	ttm_tt_fini(tt);
@@ -282,8 +282,8 @@ static void ttm_pool_alloc_caching_mismatch(struct kunit *test)
 	tt = ttm_tt_kunit_init(test, 0, tt_caching, size);
 	KUNIT_ASSERT_NOT_NULL(test, tt);
 
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt_pool->pages));
-	KUNIT_ASSERT_TRUE(test, list_empty(&pt_tt->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_pool->pages));
+	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt_tt->pages));
 
 	err = ttm_pool_alloc(pool, tt, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
@@ -291,8 +291,8 @@ static void ttm_pool_alloc_caching_mismatch(struct kunit *test)
 	ttm_pool_free(pool, tt);
 	ttm_tt_fini(tt);
 
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt_pool->pages));
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt_tt->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_pool->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_tt->pages));
 
 	ttm_pool_fini(pool);
 }
@@ -316,8 +316,8 @@ static void ttm_pool_alloc_order_mismatch(struct kunit *test)
 	tt = ttm_tt_kunit_init(test, 0, caching, snd_size);
 	KUNIT_ASSERT_NOT_NULL(test, tt);
 
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt_pool->pages));
-	KUNIT_ASSERT_TRUE(test, list_empty(&pt_tt->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_pool->pages));
+	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt_tt->pages));
 
 	err = ttm_pool_alloc(pool, tt, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
@@ -325,8 +325,8 @@ static void ttm_pool_alloc_order_mismatch(struct kunit *test)
 	ttm_pool_free(pool, tt);
 	ttm_tt_fini(tt);
 
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt_pool->pages));
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt_tt->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_pool->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_tt->pages));
 
 	ttm_pool_fini(pool);
 }
@@ -352,12 +352,12 @@ static void ttm_pool_free_dma_alloc(struct kunit *test)
 	ttm_pool_alloc(pool, tt, &simple_ctx);
 
 	pt = &pool->caching[caching].orders[order];
-	KUNIT_ASSERT_TRUE(test, list_empty(&pt->pages));
+	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt->pages));
 
 	ttm_pool_free(pool, tt);
 	ttm_tt_fini(tt);
 
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt->pages));
 
 	ttm_pool_fini(pool);
 }
@@ -383,12 +383,12 @@ static void ttm_pool_free_no_dma_alloc(struct kunit *test)
 	ttm_pool_alloc(pool, tt, &simple_ctx);
 
 	pt = &pool->caching[caching].orders[order];
-	KUNIT_ASSERT_TRUE(test, list_is_singular(&pt->pages));
+	KUNIT_ASSERT_TRUE(test, list_lru_count(&pt->pages) == 1);
 
 	ttm_pool_free(pool, tt);
 	ttm_tt_fini(tt);
 
-	KUNIT_ASSERT_TRUE(test, list_is_singular(&pt->pages));
+	KUNIT_ASSERT_TRUE(test, list_lru_count(&pt->pages) == 1);
 
 	ttm_pool_fini(pool);
 }
@@ -404,11 +404,11 @@ static void ttm_pool_fini_basic(struct kunit *test)
 	pool = ttm_pool_pre_populated(test, size, caching);
 	pt = &pool->caching[caching].orders[order];
 
-	KUNIT_ASSERT_FALSE(test, list_empty(&pt->pages));
+	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt->pages));
 
 	ttm_pool_fini(pool);
 
-	KUNIT_ASSERT_TRUE(test, list_empty(&pt->pages));
+	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt->pages));
 }
 
 static struct kunit_case ttm_pool_test_cases[] = {
diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 148c7530738d..8b0fe7a0164a 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -131,6 +131,15 @@ static struct list_head shrinker_list;
 static struct shrinker *mm_shrinker;
 static DECLARE_RWSEM(pool_shrink_rwsem);
 
+static int ttm_pool_nid(struct ttm_pool *pool) {
+	int nid = NUMA_NO_NODE;
+	if (pool)
+		nid = pool->nid;
+	if (nid == NUMA_NO_NODE)
+		nid = numa_node_id();
+	return nid;
+}
+
 /* Allocate pages of size 1 << order with the given gfp_flags */
 static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
 					unsigned int order)
@@ -288,30 +297,41 @@ static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p)
 			clear_page(page_address(p + i));
 	}
 
-	spin_lock(&pt->lock);
-	list_add(&p->lru, &pt->pages);
-	spin_unlock(&pt->lock);
+	INIT_LIST_HEAD(&p->lru);
+	rcu_read_lock();
+	list_lru_add(&pt->pages, &p->lru, page_to_nid(p), NULL);
+	rcu_read_unlock();
 	atomic_long_add(1 << pt->order, &allocated_pages);
 
 	mod_lruvec_page_state(p, NR_GPU_ACTIVE, -num_pages);
 	mod_lruvec_page_state(p, NR_GPU_RECLAIM, num_pages);
 }
 
+static enum lru_status take_one_from_lru(struct list_head *item,
+					 struct list_lru_one *list,
+					 void *cb_arg)
+{
+	struct page **out_page = cb_arg;
+	struct page *p = container_of(item, struct page, lru);
+	list_lru_isolate(list, item);
+
+	*out_page = p;
+	return LRU_REMOVED;
+}
+
 /* Take pages from a specific pool_type, return NULL when nothing available */
-static struct page *ttm_pool_type_take(struct ttm_pool_type *pt)
+static struct page *ttm_pool_type_take(struct ttm_pool_type *pt, int nid)
 {
-	struct page *p;
+	int ret;
+	struct page *p = NULL;
+	unsigned long nr_to_walk = 1;
 
-	spin_lock(&pt->lock);
-	p = list_first_entry_or_null(&pt->pages, typeof(*p), lru);
-	if (p) {
+	ret = list_lru_walk_node(&pt->pages, nid, take_one_from_lru, (void *)&p, &nr_to_walk);
+	if (ret == 1 && p) {
 		atomic_long_sub(1 << pt->order, &allocated_pages);
 		mod_lruvec_page_state(p, NR_GPU_ACTIVE, (1 << pt->order));
-		mod_lruvec_page_state(p, NR_GPU_RECLAIM, -(1 << pt->order));
-		list_del(&p->lru);
+		mod_lruvec_page_state(p, NR_GPU_RECLAIM, -(1 << pt->order));		
 	}
-	spin_unlock(&pt->lock);
-
 	return p;
 }
 
@@ -322,25 +342,47 @@ static void ttm_pool_type_init(struct ttm_pool_type *pt, struct ttm_pool *pool,
 	pt->pool = pool;
 	pt->caching = caching;
 	pt->order = order;
-	spin_lock_init(&pt->lock);
-	INIT_LIST_HEAD(&pt->pages);
+	list_lru_init(&pt->pages);
 
 	spin_lock(&shrinker_lock);
 	list_add_tail(&pt->shrinker_list, &shrinker_list);
 	spin_unlock(&shrinker_lock);
 }
 
+static enum lru_status pool_move_to_dispose_list(struct list_head *item,
+						 struct list_lru_one *list,
+						 void *cb_arg)
+{
+	struct list_head *dispose = cb_arg;
+
+	list_lru_isolate_move(list, item, dispose);
+
+	return LRU_REMOVED;
+}
+
+static void ttm_pool_dispose_list(struct ttm_pool_type *pt,
+				  struct list_head *dispose)
+{
+	while (!list_empty(dispose)) {
+		struct page *p;
+		p = list_first_entry(dispose, struct page, lru);
+		list_del_init(&p->lru);
+		atomic_long_sub(1 << pt->order, &allocated_pages);
+		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p, true);
+	}
+}
+
 /* Remove a pool_type from the global shrinker list and free all pages */
 static void ttm_pool_type_fini(struct ttm_pool_type *pt)
 {
-	struct page *p;
+	LIST_HEAD(dispose);
 
 	spin_lock(&shrinker_lock);
 	list_del(&pt->shrinker_list);
 	spin_unlock(&shrinker_lock);
 
-	while ((p = ttm_pool_type_take(pt)))
-		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p, true);
+	list_lru_walk(&pt->pages, pool_move_to_dispose_list, &dispose, LONG_MAX);
+	ttm_pool_dispose_list(pt, &dispose);
 }
 
 /* Return the pool_type to use for the given caching and order */
@@ -390,7 +432,7 @@ static unsigned int ttm_pool_shrink(void)
 	list_move_tail(&pt->shrinker_list, &shrinker_list);
 	spin_unlock(&shrinker_lock);
 
-	p = ttm_pool_type_take(pt);
+	p = ttm_pool_type_take(pt, ttm_pool_nid(pt->pool));
 	if (p) {
 		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p, true);
 		num_pages = 1 << pt->order;
@@ -744,7 +786,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 		p = NULL;
 		pt = ttm_pool_select_type(pool, page_caching, order);
 		if (pt && allow_pools)
-			p = ttm_pool_type_take(pt);
+			p = ttm_pool_type_take(pt, ttm_pool_nid(pool));
 		/*
 		 * If that fails or previously failed, allocate from system.
 		 * Note that this also disallows additional pool allocations using
@@ -1173,16 +1215,7 @@ static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
 /* Count the number of pages available in a pool_type */
 static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt)
 {
-	unsigned int count = 0;
-	struct page *p;
-
-	spin_lock(&pt->lock);
-	/* Only used for debugfs, the overhead doesn't matter */
-	list_for_each_entry(p, &pt->pages, lru)
-		++count;
-	spin_unlock(&pt->lock);
-
-	return count;
+	return list_lru_count(&pt->pages);
 }
 
 /* Print a nice header for the order */
diff --git a/include/drm/ttm/ttm_pool.h b/include/drm/ttm/ttm_pool.h
index 54cd34a6e4c0..df56527c4853 100644
--- a/include/drm/ttm/ttm_pool.h
+++ b/include/drm/ttm/ttm_pool.h
@@ -45,8 +45,7 @@ struct ttm_tt;
  * @order: the allocation order our pages have
  * @caching: the caching type our pages have
  * @shrinker_list: our place on the global shrinker list
- * @lock: protection of the page list
- * @pages: the list of pages in the pool
+ * @pages: the lru_list of pages in the pool
  */
 struct ttm_pool_type {
 	struct ttm_pool *pool;
@@ -55,8 +54,7 @@ struct ttm_pool_type {
 
 	struct list_head shrinker_list;
 
-	spinlock_t lock;
-	struct list_head pages;
+	struct list_lru pages;
 };
 
 /**
diff --git a/mm/list_lru.c b/mm/list_lru.c
index ec48b5dadf51..627589d75320 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -179,6 +179,7 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item, int nid,
 	unlock_list_lru(l, false);
 	return false;
 }
+EXPORT_SYMBOL_GPL(list_lru_add);
 
 bool list_lru_add_obj(struct list_lru *lru, struct list_head *item)
 {
-- 
2.50.1

Re: [PATCH 03/15] ttm/pool: port to list_lru. (v2)

[kernel test robot]

Hi Dave,

kernel test robot noticed the following build errors:

[auto build test ERROR on tj-cgroup/for-next]
[also build test ERROR on linus/master v6.17-rc4]
[cannot apply to akpm-mm/mm-everything next-20250902]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Dave-Airlie/drm-ttm-use-gpu-mm-stats-to-track-gpu-memory-allocations-v4/20250902-130646
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next
patch link:    https://lore.kernel.org/r/20250902041024.2040450-4-airlied%40gmail.com
patch subject: [PATCH 03/15] ttm/pool: port to list_lru. (v2)
config: i386-buildonly-randconfig-002-20250903 (https://download.01.org/0day-ci/archive/20250903/202509030849.OExBO13p-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509030849.OExBO13p-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509030849.OExBO13p-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/drm/ttm/ttm_device.h:31,
                    from drivers/gpu/drm/ttm/ttm_range_manager.c:32:
>> include/drm/ttm/ttm_pool.h:57:25: error: field 'pages' has incomplete type
      57 |         struct list_lru pages;
         |                         ^~~~~


vim +/pages +57 include/drm/ttm/ttm_pool.h

    40	
    41	/**
    42	 * struct ttm_pool_type - Pool for a certain memory type
    43	 *
    44	 * @pool: the pool we belong to, might be NULL for the global ones
    45	 * @order: the allocation order our pages have
    46	 * @caching: the caching type our pages have
    47	 * @shrinker_list: our place on the global shrinker list
    48	 * @pages: the lru_list of pages in the pool
    49	 */
    50	struct ttm_pool_type {
    51		struct ttm_pool *pool;
    52		unsigned int order;
    53		enum ttm_caching caching;
    54	
    55		struct list_head shrinker_list;
    56	
  > 57		struct list_lru pages;
    58	};
    59	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH 04/15] ttm/pool: drop numa specific pools

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

The list_lru will now handle numa for us, so need to keep
separate pool types for it. Just consoldiate into the global ones.

This adds a debugfs change to avoid dumping non-existant orders due
to this change.

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/ttm/ttm_pool.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 8b0fe7a0164a..bc8a796201b4 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -396,17 +396,11 @@ static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool,
 #ifdef CONFIG_X86
 	switch (caching) {
 	case ttm_write_combined:
-		if (pool->nid != NUMA_NO_NODE)
-			return &pool->caching[caching].orders[order];
-
 		if (pool->use_dma32)
 			return &global_dma32_write_combined[order];
 
 		return &global_write_combined[order];
 	case ttm_uncached:
-		if (pool->nid != NUMA_NO_NODE)
-			return &pool->caching[caching].orders[order];
-
 		if (pool->use_dma32)
 			return &global_dma32_uncached[order];
 
@@ -1281,7 +1275,7 @@ int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m)
 {
 	unsigned int i;
 
-	if (!pool->use_dma_alloc && pool->nid == NUMA_NO_NODE) {
+	if (!pool->use_dma_alloc) {
 		seq_puts(m, "unused\n");
 		return 0;
 	}
@@ -1292,10 +1286,7 @@ int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m)
 	for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i) {
 		if (!ttm_pool_select_type(pool, i, 0))
 			continue;
-		if (pool->use_dma_alloc)
-			seq_puts(m, "DMA ");
-		else
-			seq_printf(m, "N%d ", pool->nid);
+		seq_puts(m, "DMA ");
 		switch (i) {
 		case ttm_cached:
 			seq_puts(m, "\t:");
-- 
2.50.1

[PATCH 05/15] ttm/pool: make pool shrinker NUMA aware

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This enable NUMA awareness for the shrinker on the
ttm pools.

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/ttm/ttm_pool.c | 38 +++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index bc8a796201b4..ae46aa370545 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -413,12 +413,12 @@ static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool,
 	return NULL;
 }
 
-/* Free pages using the global shrinker list */
-static unsigned int ttm_pool_shrink(void)
+/* Free pages using the per-node shrinker list */
+static unsigned int ttm_pool_shrink(int nid, unsigned long num_to_free)
 {
+	LIST_HEAD(dispose);
 	struct ttm_pool_type *pt;
 	unsigned int num_pages;
-	struct page *p;
 
 	down_read(&pool_shrink_rwsem);
 	spin_lock(&shrinker_lock);
@@ -426,13 +426,10 @@ static unsigned int ttm_pool_shrink(void)
 	list_move_tail(&pt->shrinker_list, &shrinker_list);
 	spin_unlock(&shrinker_lock);
 
-	p = ttm_pool_type_take(pt, ttm_pool_nid(pt->pool));
-	if (p) {
-		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p, true);
-		num_pages = 1 << pt->order;
-	} else {
-		num_pages = 0;
-	}
+	num_pages = list_lru_walk_node(&pt->pages, nid, pool_move_to_dispose_list, &dispose, &num_to_free);
+	num_pages *= 1 << pt->order;
+
+	ttm_pool_dispose_list(pt, &dispose);
 	up_read(&pool_shrink_rwsem);
 
 	return num_pages;
@@ -781,6 +778,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 		pt = ttm_pool_select_type(pool, page_caching, order);
 		if (pt && allow_pools)
 			p = ttm_pool_type_take(pt, ttm_pool_nid(pool));
+
 		/*
 		 * If that fails or previously failed, allocate from system.
 		 * Note that this also disallows additional pool allocations using
@@ -929,8 +927,10 @@ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt)
 {
 	ttm_pool_free_range(pool, tt, tt->caching, 0, tt->num_pages);
 
-	while (atomic_long_read(&allocated_pages) > page_pool_size)
-		ttm_pool_shrink();
+	while (atomic_long_read(&allocated_pages) > page_pool_size) {
+		unsigned long diff = page_pool_size - atomic_long_read(&allocated_pages);
+		ttm_pool_shrink(ttm_pool_nid(pool), diff);
+	}
 }
 EXPORT_SYMBOL(ttm_pool_free);
 
@@ -1187,7 +1187,7 @@ static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
 	unsigned long num_freed = 0;
 
 	do
-		num_freed += ttm_pool_shrink();
+		num_freed += ttm_pool_shrink(sc->nid, sc->nr_to_scan);
 	while (num_freed < sc->nr_to_scan &&
 	       atomic_long_read(&allocated_pages));
 
@@ -1315,11 +1315,15 @@ static int ttm_pool_debugfs_shrink_show(struct seq_file *m, void *data)
 		.nr_to_scan = TTM_SHRINKER_BATCH,
 	};
 	unsigned long count;
+	int nid;
 
 	fs_reclaim_acquire(GFP_KERNEL);
-	count = ttm_pool_shrinker_count(mm_shrinker, &sc);
-	seq_printf(m, "%lu/%lu\n", count,
-		   ttm_pool_shrinker_scan(mm_shrinker, &sc));
+	for_each_node(nid) {
+		sc.nid = nid;
+		count = ttm_pool_shrinker_count(mm_shrinker, &sc);
+		seq_printf(m, "%d: %lu/%lu\n", nid, count,
+			   ttm_pool_shrinker_scan(mm_shrinker, &sc));
+	}
 	fs_reclaim_release(GFP_KERNEL);
 
 	return 0;
@@ -1367,7 +1371,7 @@ int ttm_pool_mgr_init(unsigned long num_pages)
 #endif
 #endif
 
-	mm_shrinker = shrinker_alloc(0, "drm-ttm_pool");
+	mm_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "drm-ttm_pool");
 	if (!mm_shrinker)
 		return -ENOMEM;
 
-- 
2.50.1

[PATCH 06/15] ttm/pool: track allocated_pages per numa node.

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This gets the memory sizes from the nodes and stores the limit
as 50% of those. I think eventually we should drop the limits
once we have memcg aware shrinking, but this should be more NUMA
friendly, and I think seems like what people would prefer to
happen on NUMA aware systems.

Cc: Christian Koenig <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/ttm/ttm_pool.c | 60 +++++++++++++++++++++++++---------
 1 file changed, 45 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index ae46aa370545..bd08667c9cfb 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -115,10 +115,11 @@ struct ttm_pool_tt_restore {
 
 static unsigned long page_pool_size;
 
-MODULE_PARM_DESC(page_pool_size, "Number of pages in the WC/UC/DMA pool");
+MODULE_PARM_DESC(page_pool_size, "Number of pages in the WC/UC/DMA pool per NUMA node");
 module_param(page_pool_size, ulong, 0644);
 
-static atomic_long_t allocated_pages;
+static unsigned long pool_node_limit[MAX_NUMNODES];
+static atomic_long_t allocated_pages[MAX_NUMNODES];
 
 static struct ttm_pool_type global_write_combined[NR_PAGE_ORDERS];
 static struct ttm_pool_type global_uncached[NR_PAGE_ORDERS];
@@ -289,6 +290,7 @@ static void ttm_pool_unmap(struct ttm_pool *pool, dma_addr_t dma_addr,
 static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p)
 {
 	unsigned int i, num_pages = 1 << pt->order;
+	int nid = page_to_nid(p);
 
 	for (i = 0; i < num_pages; ++i) {
 		if (PageHighMem(p))
@@ -299,10 +301,10 @@ static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p)
 
 	INIT_LIST_HEAD(&p->lru);
 	rcu_read_lock();
-	list_lru_add(&pt->pages, &p->lru, page_to_nid(p), NULL);
+	list_lru_add(&pt->pages, &p->lru, nid, NULL);
 	rcu_read_unlock();
-	atomic_long_add(1 << pt->order, &allocated_pages);
 
+	atomic_long_add(num_pages, &allocated_pages[nid]);	
 	mod_lruvec_page_state(p, NR_GPU_ACTIVE, -num_pages);
 	mod_lruvec_page_state(p, NR_GPU_RECLAIM, num_pages);
 }
@@ -328,7 +330,7 @@ static struct page *ttm_pool_type_take(struct ttm_pool_type *pt, int nid)
 
 	ret = list_lru_walk_node(&pt->pages, nid, take_one_from_lru, (void *)&p, &nr_to_walk);
 	if (ret == 1 && p) {
-		atomic_long_sub(1 << pt->order, &allocated_pages);
+		atomic_long_sub(1 << pt->order, &allocated_pages[nid]);
 		mod_lruvec_page_state(p, NR_GPU_ACTIVE, (1 << pt->order));
 		mod_lruvec_page_state(p, NR_GPU_RECLAIM, -(1 << pt->order));		
 	}
@@ -367,7 +369,7 @@ static void ttm_pool_dispose_list(struct ttm_pool_type *pt,
 		struct page *p;
 		p = list_first_entry(dispose, struct page, lru);
 		list_del_init(&p->lru);
-		atomic_long_sub(1 << pt->order, &allocated_pages);
+		atomic_long_sub(1 << pt->order, &allocated_pages[page_to_nid(p)]);
 		ttm_pool_free_page(pt->pool, pt->caching, pt->order, p, true);
 	}
 }
@@ -925,11 +927,13 @@ int ttm_pool_restore_and_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
  */
 void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt)
 {
+	int nid = ttm_pool_nid(pool);
+
 	ttm_pool_free_range(pool, tt, tt->caching, 0, tt->num_pages);
 
-	while (atomic_long_read(&allocated_pages) > page_pool_size) {
-		unsigned long diff = page_pool_size - atomic_long_read(&allocated_pages);
-		ttm_pool_shrink(ttm_pool_nid(pool), diff);
+	while (atomic_long_read(&allocated_pages[nid]) > pool_node_limit[nid]) {
+		unsigned long diff = pool_node_limit[nid] - atomic_long_read(&allocated_pages[nid]);
+		ttm_pool_shrink(nid, diff);
 	}
 }
 EXPORT_SYMBOL(ttm_pool_free);
@@ -1189,7 +1193,7 @@ static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
 	do
 		num_freed += ttm_pool_shrink(sc->nid, sc->nr_to_scan);
 	while (num_freed < sc->nr_to_scan &&
-	       atomic_long_read(&allocated_pages));
+	       atomic_long_read(&allocated_pages[sc->nid]));
 
 	sc->nr_scanned = num_freed;
 
@@ -1200,7 +1204,7 @@ static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
 static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
 					     struct shrink_control *sc)
 {
-	unsigned long num_pages = atomic_long_read(&allocated_pages);
+	unsigned long num_pages = atomic_long_read(&allocated_pages[sc->nid]);
 
 	return num_pages ? num_pages : SHRINK_EMPTY;
 }
@@ -1237,8 +1241,12 @@ static void ttm_pool_debugfs_orders(struct ttm_pool_type *pt,
 /* Dump the total amount of allocated pages */
 static void ttm_pool_debugfs_footer(struct seq_file *m)
 {
-	seq_printf(m, "\ntotal\t: %8lu of %8lu\n",
-		   atomic_long_read(&allocated_pages), page_pool_size);
+	int nid;
+
+	for_each_node(nid) {
+		seq_printf(m, "\ntotal node%d\t: %8lu of %8lu\n", nid,
+			   atomic_long_read(&allocated_pages[nid]), pool_node_limit[nid]);
+	}
 }
 
 /* Dump the information for the global pools */
@@ -1332,6 +1340,22 @@ DEFINE_SHOW_ATTRIBUTE(ttm_pool_debugfs_shrink);
 
 #endif
 
+static inline uint64_t ttm_get_node_memory_size(int nid)
+{
+	/* This is directly using si_meminfo_node implementation as the
+	 * function is not exported.
+	 */
+	int zone_type;
+	uint64_t managed_pages = 0;
+
+	pg_data_t *pgdat = NODE_DATA(nid);
+
+	for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
+		managed_pages +=
+			zone_managed_pages(&pgdat->node_zones[zone_type]);
+	return managed_pages * PAGE_SIZE;
+}
+
 /**
  * ttm_pool_mgr_init - Initialize globals
  *
@@ -1343,8 +1367,14 @@ int ttm_pool_mgr_init(unsigned long num_pages)
 {
 	unsigned int i;
 
-	if (!page_pool_size)
-		page_pool_size = num_pages;
+	int nid;
+	for_each_node(nid) {
+		if (!page_pool_size) {
+			uint64_t node_size = ttm_get_node_memory_size(nid);
+			pool_node_limit[nid] = (node_size >> PAGE_SHIFT) / 2;
+		} else
+			pool_node_limit[nid] = page_pool_size;
+	}
 
 	spin_lock_init(&shrinker_lock);
 	INIT_LIST_HEAD(&shrinker_list);
-- 
2.50.1

[PATCH 07/15] memcg: add support for GPU page counters. (v3)

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This introduces 2 new statistics and 3 new memcontrol APIs for dealing
with GPU system memory allocations.

The stats corresponds to the same stats in the global vmstat,
for number of active GPU pages, and number of pages in pools that
can be reclaimed.

The first API charges a order of pages to a objcg, and sets
the objcg on the pages like kmem does, and updates the active/reclaim
statistic.

The second API uncharges a page from the obj cgroup it is currently charged
to.

The third API allows moving a page to/from reclaim and between obj cgroups.
When pages are added to the pool lru, this just updates accounting.
When pages are being removed from a pool lru, they can be taken from
the parent objcg so this allows them to be uncharged from there and transferred
to a new child objcg.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
v2: use memcg_node_stat_items
v3: fix null ptr dereference in uncharge
---
 Documentation/admin-guide/cgroup-v2.rst |   6 ++
 include/linux/memcontrol.h              |  12 +++
 mm/memcontrol.c                         | 107 ++++++++++++++++++++++++
 3 files changed, 125 insertions(+)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 51c0bc4c2dc5..2b5f778fa00d 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1551,6 +1551,12 @@ The following nested keys are defined.
 	  vmalloc (npn)
 		Amount of memory used for vmap backed memory.
 
+	  gpu_active (npn)
+		Amount of system memory used for GPU devices.
+
+	  gpu_reclaim (npn)
+		Amount of system memory cached for GPU devices.
+
 	  shmem
 		Amount of cached filesystem data that is swap-backed,
 		such as tmpfs, shm segments, shared anonymous mmap()s
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 785173aa0739..d7cfb9925db5 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1599,6 +1599,18 @@ struct sock;
 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
 			     gfp_t gfp_mask);
 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
+
+bool mem_cgroup_charge_gpu_page(struct obj_cgroup *objcg, struct page *page,
+			   unsigned int nr_pages,
+			   gfp_t gfp_mask, bool reclaim);
+void mem_cgroup_uncharge_gpu_page(struct page *page,
+				  unsigned int nr_pages,
+				  bool reclaim);
+bool mem_cgroup_move_gpu_page_reclaim(struct obj_cgroup *objcg,
+				      struct page *page,
+				      unsigned int order,
+				      bool to_reclaim);
+
 #ifdef CONFIG_MEMCG
 extern struct static_key_false memcg_sockets_enabled_key;
 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 8dd7fbed5a94..3d637c7e10cf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -329,6 +329,8 @@ static const unsigned int memcg_node_stat_items[] = {
 #ifdef CONFIG_HUGETLB_PAGE
 	NR_HUGETLB,
 #endif
+	NR_GPU_ACTIVE,
+	NR_GPU_RECLAIM,
 };
 
 static const unsigned int memcg_stat_items[] = {
@@ -1340,6 +1342,8 @@ static const struct memory_stat memory_stats[] = {
 	{ "percpu",			MEMCG_PERCPU_B			},
 	{ "sock",			MEMCG_SOCK			},
 	{ "vmalloc",			MEMCG_VMALLOC			},
+	{ "gpu_active",			NR_GPU_ACTIVE			},
+	{ "gpu_reclaim",		NR_GPU_RECLAIM	                },
 	{ "shmem",			NR_SHMEM			},
 #ifdef CONFIG_ZSWAP
 	{ "zswap",			MEMCG_ZSWAP_B			},
@@ -5064,6 +5068,109 @@ void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
 	refill_stock(memcg, nr_pages);
 }
 
+/**
+ * mem_cgroup_charge_gpu_page - charge a page to GPU memory tracking
+ * @objcg: objcg to charge, NULL charges root memcg
+ * @page: page to charge
+ * @order: page allocation order
+ * @gfp_mask: gfp mode
+ * @reclaim: charge the reclaim counter instead of the active one.
+ *
+ * Charge the order sized @page to the objcg. Returns %true if the charge fit within
+ * @objcg's configured limit, %false if it doesn't.
+ */
+bool mem_cgroup_charge_gpu_page(struct obj_cgroup *objcg, struct page *page,
+				unsigned int order, gfp_t gfp_mask, bool reclaim)
+{
+	unsigned int nr_pages = 1 << order;
+	struct mem_cgroup *memcg = NULL;
+	struct lruvec *lruvec;
+	int ret;
+
+	if (objcg) {
+		memcg = get_mem_cgroup_from_objcg(objcg);
+
+		ret = try_charge_memcg(memcg, gfp_mask, nr_pages);
+		if (ret) {
+			mem_cgroup_put(memcg);
+			return false;
+		}
+
+		obj_cgroup_get(objcg);
+		page_set_objcg(page, objcg);
+	}
+
+	lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page));
+	mod_lruvec_state(lruvec, reclaim ? NR_GPU_RECLAIM : NR_GPU_ACTIVE, nr_pages);
+
+	mem_cgroup_put(memcg);
+	return true;
+}
+EXPORT_SYMBOL_GPL(mem_cgroup_charge_gpu_page);
+
+/**
+ * mem_cgroup_uncharge_gpu_page - uncharge a page from GPU memory tracking
+ * @page: page to uncharge
+ * @order: order of the page allocation
+ * @reclaim: uncharge the reclaim counter instead of the active.
+ */
+void mem_cgroup_uncharge_gpu_page(struct page *page,
+				  unsigned int order, bool reclaim)
+{
+	struct obj_cgroup *objcg = page_objcg(page);
+	struct mem_cgroup *memcg;
+	struct lruvec *lruvec;
+	int nr_pages = 1 << order;
+
+	memcg = objcg ? get_mem_cgroup_from_objcg(objcg) : NULL;
+
+	lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page));
+	mod_lruvec_state(lruvec, reclaim ? NR_GPU_RECLAIM : NR_GPU_ACTIVE, -nr_pages);
+
+	if (memcg && !mem_cgroup_is_root(memcg))
+		refill_stock(memcg, nr_pages);
+	page->memcg_data = 0;
+	obj_cgroup_put(objcg);
+	mem_cgroup_put(memcg);
+}
+EXPORT_SYMBOL_GPL(mem_cgroup_uncharge_gpu_page);
+
+/**
+ * mem_cgroup_move_gpu_reclaim - move pages from gpu to gpu reclaim and back
+ * @new_objcg: objcg to move page to, NULL if just stats update.
+ * @nr_pages: number of pages to move
+ * @to_reclaim: true moves pages into reclaim, false moves them back
+ */
+bool mem_cgroup_move_gpu_page_reclaim(struct obj_cgroup *new_objcg,
+				      struct page *page,
+				      unsigned int order,
+				      bool to_reclaim)
+{
+	struct obj_cgroup *objcg = page_objcg(page);
+
+	if (!objcg)
+		return false;
+
+	if (!new_objcg || objcg == new_objcg) {
+		struct mem_cgroup *memcg = get_mem_cgroup_from_objcg(objcg);
+		struct lruvec *lruvec;
+		unsigned long flags;
+		int nr_pages = 1 << order;
+
+		lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page));
+		local_irq_save(flags);
+		__mod_lruvec_state(lruvec, to_reclaim ? NR_GPU_RECLAIM : NR_GPU_ACTIVE, nr_pages);
+		__mod_lruvec_state(lruvec, to_reclaim ? NR_GPU_ACTIVE : NR_GPU_RECLAIM, -nr_pages);
+		local_irq_restore(flags);
+		mem_cgroup_put(memcg);
+		return true;
+	} else {
+		mem_cgroup_uncharge_gpu_page(page, order, true);
+		return mem_cgroup_charge_gpu_page(new_objcg, page, order, 0, false);
+	}
+}
+EXPORT_SYMBOL_GPL(mem_cgroup_move_gpu_page_reclaim);
+
 static int __init cgroup_memory(char *s)
 {
 	char *token;
-- 
2.50.1

[PATCH 08/15] ttm: add a memcg accounting flag to the alloc/populate APIs

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This flag does nothing yet, but this just changes the APIs to accept
it in the future across all users.

This flag will eventually be filled out with when to account a tt
populate to a memcg.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c          |  3 ++-
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c          |  5 +++--
 drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c     |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c       |  4 ++--
 drivers/gpu/drm/loongson/lsdc_ttm.c              |  3 ++-
 drivers/gpu/drm/nouveau/nouveau_bo.c             |  6 ++++--
 drivers/gpu/drm/radeon/radeon_ttm.c              |  3 ++-
 drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c |  2 +-
 drivers/gpu/drm/ttm/tests/ttm_pool_test.c        | 16 ++++++++--------
 drivers/gpu/drm/ttm/tests/ttm_tt_test.c          | 12 ++++++------
 drivers/gpu/drm/ttm/ttm_bo.c                     |  5 +++--
 drivers/gpu/drm/ttm/ttm_bo_util.c                |  6 +++---
 drivers/gpu/drm/ttm/ttm_bo_vm.c                  |  4 +++-
 drivers/gpu/drm/ttm/ttm_pool.c                   |  6 ++++--
 drivers/gpu/drm/ttm/ttm_tt.c                     |  8 +++++---
 drivers/gpu/drm/vmwgfx/vmwgfx_blit.c             |  4 ++--
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c       |  7 ++++---
 drivers/gpu/drm/xe/xe_bo.c                       |  3 ++-
 include/drm/ttm/ttm_bo.h                         |  1 +
 include/drm/ttm/ttm_device.h                     |  1 +
 include/drm/ttm/ttm_pool.h                       |  1 +
 include/drm/ttm/ttm_tt.h                         |  1 +
 22 files changed, 61 insertions(+), 42 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 27ab4e754b2a..f71431e8e6b9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1139,6 +1139,7 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
  */
 static int amdgpu_ttm_tt_populate(struct ttm_device *bdev,
 				  struct ttm_tt *ttm,
+				  bool memcg_account,
 				  struct ttm_operation_ctx *ctx)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bdev);
@@ -1162,7 +1163,7 @@ static int amdgpu_ttm_tt_populate(struct ttm_device *bdev,
 		pool = &adev->mman.ttm_pools[gtt->pool_id];
 	else
 		pool = &adev->mman.bdev.pool;
-	ret = ttm_pool_alloc(pool, ttm, ctx);
+	ret = ttm_pool_alloc(pool, ttm, memcg_account, ctx);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 1f4814968868..6cdaf3696583 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -314,6 +314,7 @@ static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,
 
 static int i915_ttm_tt_populate(struct ttm_device *bdev,
 				struct ttm_tt *ttm,
+				bool memcg_account,
 				struct ttm_operation_ctx *ctx)
 {
 	struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
@@ -321,7 +322,7 @@ static int i915_ttm_tt_populate(struct ttm_device *bdev,
 	if (i915_tt->is_shmem)
 		return i915_ttm_tt_shmem_populate(bdev, ttm, ctx);
 
-	return ttm_pool_alloc(&bdev->pool, ttm, ctx);
+	return ttm_pool_alloc(&bdev->pool, ttm, memcg_account, ctx);
 }
 
 static void i915_ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
@@ -808,7 +809,7 @@ static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,
 	}
 
 	if (bo->ttm && !ttm_tt_is_populated(bo->ttm)) {
-		ret = ttm_bo_populate(bo, &ctx);
+		ret = ttm_bo_populate(bo, false, &ctx);
 		if (ret)
 			return ret;
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
index 2f6b33edb9c9..4ab1eb3e42bc 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
@@ -624,7 +624,7 @@ int i915_ttm_move(struct ttm_buffer_object *bo, bool evict,
 
 	/* Populate ttm with pages if needed. Typically system memory. */
 	if (ttm && (dst_man->use_tt || (ttm->page_flags & TTM_TT_FLAG_SWAPPED))) {
-		ret = ttm_bo_populate(bo, ctx);
+		ret = ttm_bo_populate(bo, false, ctx);
 		if (ret)
 			return ret;
 	}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c
index 61596cecce4d..0b555979d786 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c
@@ -90,7 +90,7 @@ static int i915_ttm_backup(struct i915_gem_apply_to_region *apply,
 		goto out_no_lock;
 
 	backup_bo = i915_gem_to_ttm(backup);
-	err = ttm_bo_populate(backup_bo, &ctx);
+	err = ttm_bo_populate(backup_bo, false, &ctx);
 	if (err)
 		goto out_no_populate;
 
@@ -189,7 +189,7 @@ static int i915_ttm_restore(struct i915_gem_apply_to_region *apply,
 	if (!backup_bo->resource)
 		err = ttm_bo_validate(backup_bo, i915_ttm_sys_placement(), &ctx);
 	if (!err)
-		err = ttm_bo_populate(backup_bo, &ctx);
+		err = ttm_bo_populate(backup_bo, false, &ctx);
 	if (!err) {
 		err = i915_gem_obj_copy_ttm(obj, backup, pm_apply->allow_gpu,
 					    false);
diff --git a/drivers/gpu/drm/loongson/lsdc_ttm.c b/drivers/gpu/drm/loongson/lsdc_ttm.c
index 2e42c6970c9f..6d8781506802 100644
--- a/drivers/gpu/drm/loongson/lsdc_ttm.c
+++ b/drivers/gpu/drm/loongson/lsdc_ttm.c
@@ -110,6 +110,7 @@ lsdc_ttm_tt_create(struct ttm_buffer_object *tbo, uint32_t page_flags)
 
 static int lsdc_ttm_tt_populate(struct ttm_device *bdev,
 				struct ttm_tt *ttm,
+				bool memcg_account,
 				struct ttm_operation_ctx *ctx)
 {
 	bool slave = !!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL);
@@ -122,7 +123,7 @@ static int lsdc_ttm_tt_populate(struct ttm_device *bdev,
 		return 0;
 	}
 
-	return ttm_pool_alloc(&bdev->pool, ttm, ctx);
+	return ttm_pool_alloc(&bdev->pool, ttm, memcg_account, ctx);
 }
 
 static void lsdc_ttm_tt_unpopulate(struct ttm_device *bdev,
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index b96f0555ca14..1f2b9f5f2bf8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1417,7 +1417,9 @@ vm_fault_t nouveau_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 
 static int
 nouveau_ttm_tt_populate(struct ttm_device *bdev,
-			struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
+			struct ttm_tt *ttm,
+			bool memcg_account,
+			struct ttm_operation_ctx *ctx)
 {
 	struct ttm_tt *ttm_dma = (void *)ttm;
 	struct nouveau_drm *drm;
@@ -1434,7 +1436,7 @@ nouveau_ttm_tt_populate(struct ttm_device *bdev,
 
 	drm = nouveau_bdev(bdev);
 
-	return ttm_pool_alloc(&drm->ttm.bdev.pool, ttm, ctx);
+	return ttm_pool_alloc(&drm->ttm.bdev.pool, ttm, memcg_account, ctx);
 }
 
 static void
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 616d25c8c2de..8c4273239d16 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -526,6 +526,7 @@ static struct radeon_ttm_tt *radeon_ttm_tt_to_gtt(struct radeon_device *rdev,
 
 static int radeon_ttm_tt_populate(struct ttm_device *bdev,
 				  struct ttm_tt *ttm,
+				  bool memcg_account,
 				  struct ttm_operation_ctx *ctx)
 {
 	struct radeon_device *rdev = radeon_get_rdev(bdev);
@@ -547,7 +548,7 @@ static int radeon_ttm_tt_populate(struct ttm_device *bdev,
 		return 0;
 	}
 
-	return ttm_pool_alloc(&rdev->mman.bdev.pool, ttm, ctx);
+	return ttm_pool_alloc(&rdev->mman.bdev.pool, ttm, memcg_account, ctx);
 }
 
 static void radeon_ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
diff --git a/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c b/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
index 1bcc67977f48..9869586ee57e 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
@@ -538,7 +538,7 @@ static void ttm_bo_validate_no_placement_signaled(struct kunit *test)
 
 	if (params->with_ttm) {
 		old_tt = priv->ttm_dev->funcs->ttm_tt_create(bo, 0);
-		ttm_pool_alloc(&priv->ttm_dev->pool, old_tt, &ctx);
+		ttm_pool_alloc(&priv->ttm_dev->pool, old_tt, false, &ctx);
 		bo->ttm = old_tt;
 	}
 
diff --git a/drivers/gpu/drm/ttm/tests/ttm_pool_test.c b/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
index 39234a3e98c4..aaf152c2383d 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
@@ -88,7 +88,7 @@ static struct ttm_pool *ttm_pool_pre_populated(struct kunit *test,
 
 	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, true, false);
 
-	err = ttm_pool_alloc(pool, tt, &simple_ctx);
+	err = ttm_pool_alloc(pool, tt, false, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
 	ttm_pool_free(pool, tt);
@@ -157,7 +157,7 @@ static void ttm_pool_alloc_basic(struct kunit *test)
 	KUNIT_ASSERT_EQ(test, pool->nid, NUMA_NO_NODE);
 	KUNIT_ASSERT_EQ(test, pool->use_dma_alloc, params->use_dma_alloc);
 
-	err = ttm_pool_alloc(pool, tt, &simple_ctx);
+	err = ttm_pool_alloc(pool, tt, false, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 	KUNIT_ASSERT_EQ(test, tt->num_pages, expected_num_pages);
 
@@ -220,7 +220,7 @@ static void ttm_pool_alloc_basic_dma_addr(struct kunit *test)
 
 	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, true, false);
 
-	err = ttm_pool_alloc(pool, tt, &simple_ctx);
+	err = ttm_pool_alloc(pool, tt, false, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 	KUNIT_ASSERT_EQ(test, tt->num_pages, expected_num_pages);
 
@@ -253,7 +253,7 @@ static void ttm_pool_alloc_order_caching_match(struct kunit *test)
 	tt = ttm_tt_kunit_init(test, 0, caching, size);
 	KUNIT_ASSERT_NOT_NULL(test, tt);
 
-	err = ttm_pool_alloc(pool, tt, &simple_ctx);
+	err = ttm_pool_alloc(pool, tt, false, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
 	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt->pages));
@@ -285,7 +285,7 @@ static void ttm_pool_alloc_caching_mismatch(struct kunit *test)
 	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_pool->pages));
 	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt_tt->pages));
 
-	err = ttm_pool_alloc(pool, tt, &simple_ctx);
+	err = ttm_pool_alloc(pool, tt, false, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
 	ttm_pool_free(pool, tt);
@@ -319,7 +319,7 @@ static void ttm_pool_alloc_order_mismatch(struct kunit *test)
 	KUNIT_ASSERT_FALSE(test, !list_lru_count(&pt_pool->pages));
 	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt_tt->pages));
 
-	err = ttm_pool_alloc(pool, tt, &simple_ctx);
+	err = ttm_pool_alloc(pool, tt, false, &simple_ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
 	ttm_pool_free(pool, tt);
@@ -349,7 +349,7 @@ static void ttm_pool_free_dma_alloc(struct kunit *test)
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 
 	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, true, false);
-	ttm_pool_alloc(pool, tt, &simple_ctx);
+	ttm_pool_alloc(pool, tt, false, &simple_ctx);
 
 	pt = &pool->caching[caching].orders[order];
 	KUNIT_ASSERT_TRUE(test, !list_lru_count(&pt->pages));
@@ -380,7 +380,7 @@ static void ttm_pool_free_no_dma_alloc(struct kunit *test)
 	KUNIT_ASSERT_NOT_NULL(test, pool);
 
 	ttm_pool_init(pool, devs->dev, NUMA_NO_NODE, false, false);
-	ttm_pool_alloc(pool, tt, &simple_ctx);
+	ttm_pool_alloc(pool, tt, false, &simple_ctx);
 
 	pt = &pool->caching[caching].orders[order];
 	KUNIT_ASSERT_TRUE(test, list_lru_count(&pt->pages) == 1);
diff --git a/drivers/gpu/drm/ttm/tests/ttm_tt_test.c b/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
index 61ec6f580b62..333c503e218b 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
@@ -262,7 +262,7 @@ static void ttm_tt_populate_null_ttm(struct kunit *test)
 	struct ttm_operation_ctx ctx = { };
 	int err;
 
-	err = ttm_tt_populate(devs->ttm_dev, NULL, &ctx);
+	err = ttm_tt_populate(devs->ttm_dev, NULL, false, &ctx);
 	KUNIT_ASSERT_EQ(test, err, -EINVAL);
 }
 
@@ -283,11 +283,11 @@ static void ttm_tt_populate_populated_ttm(struct kunit *test)
 	err = ttm_tt_init(tt, bo, 0, ttm_cached, 0);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
-	err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+	err = ttm_tt_populate(devs->ttm_dev, tt, false, &ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 	populated_page = *tt->pages;
 
-	err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+	err = ttm_tt_populate(devs->ttm_dev, tt, false, &ctx);
 	KUNIT_ASSERT_PTR_EQ(test, populated_page, *tt->pages);
 }
 
@@ -307,7 +307,7 @@ static void ttm_tt_unpopulate_basic(struct kunit *test)
 	err = ttm_tt_init(tt, bo, 0, ttm_cached, 0);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
-	err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+	err = ttm_tt_populate(devs->ttm_dev, tt, false, &ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 	KUNIT_ASSERT_TRUE(test, ttm_tt_is_populated(tt));
 
@@ -351,7 +351,7 @@ static void ttm_tt_swapin_basic(struct kunit *test)
 	err = ttm_tt_init(tt, bo, 0, ttm_cached, 0);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
-	err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+	err = ttm_tt_populate(devs->ttm_dev, tt, false, &ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 	KUNIT_ASSERT_TRUE(test, ttm_tt_is_populated(tt));
 
@@ -361,7 +361,7 @@ static void ttm_tt_swapin_basic(struct kunit *test)
 	KUNIT_ASSERT_TRUE(test, tt->page_flags & TTM_TT_FLAG_SWAPPED);
 
 	/* Swapout depopulates TT, allocate pages and then swap them in */
-	err = ttm_pool_alloc(&devs->ttm_dev->pool, tt, &ctx);
+	err = ttm_pool_alloc(&devs->ttm_dev->pool, tt, false, &ctx);
 	KUNIT_ASSERT_EQ(test, err, 0);
 
 	err = ttm_tt_swapin(tt);
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index f4d9e68b21e7..af04bb8e2c2a 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -142,7 +142,7 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 			goto out_err;
 
 		if (mem->mem_type != TTM_PL_SYSTEM) {
-			ret = ttm_bo_populate(bo, ctx);
+			ret = ttm_bo_populate(bo, false, ctx);
 			if (ret)
 				goto out_err;
 		}
@@ -1256,6 +1256,7 @@ void ttm_bo_tt_destroy(struct ttm_buffer_object *bo)
  * is set to true.
  */
 int ttm_bo_populate(struct ttm_buffer_object *bo,
+		    bool memcg_account,
 		    struct ttm_operation_ctx *ctx)
 {
 	struct ttm_tt *tt = bo->ttm;
@@ -1268,7 +1269,7 @@ int ttm_bo_populate(struct ttm_buffer_object *bo,
 		return 0;
 
 	swapped = ttm_tt_is_swapped(tt);
-	ret = ttm_tt_populate(bo->bdev, tt, ctx);
+	ret = ttm_tt_populate(bo->bdev, tt, memcg_account, ctx);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index acbbca9d5c92..13a9e9bba968 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -167,7 +167,7 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 	src_man = ttm_manager_type(bdev, src_mem->mem_type);
 	if (ttm && ((ttm->page_flags & TTM_TT_FLAG_SWAPPED) ||
 		    dst_man->use_tt)) {
-		ret = ttm_bo_populate(bo, ctx);
+		ret = ttm_bo_populate(bo, false, ctx);
 		if (ret)
 			return ret;
 	}
@@ -355,7 +355,7 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 
 	BUG_ON(!ttm);
 
-	ret = ttm_bo_populate(bo, &ctx);
+	ret = ttm_bo_populate(bo, false, &ctx);
 	if (ret)
 		return ret;
 
@@ -538,7 +538,7 @@ int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map)
 		pgprot_t prot;
 		void *vaddr;
 
-		ret = ttm_bo_populate(bo, &ctx);
+		ret = ttm_bo_populate(bo, false, &ctx);
 		if (ret)
 			return ret;
 
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index b47020fca199..c5ad447debe3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -225,7 +225,9 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
 		};
 
 		ttm = bo->ttm;
-		err = ttm_bo_populate(bo, &ctx);
+		err = ttm_bo_populate(bo,
+				      false,
+				      &ctx);
 		if (err) {
 			if (err == -EINTR || err == -ERESTARTSYS ||
 			    err == -EAGAIN)
diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index bd08667c9cfb..9a8b4f824bc1 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -742,6 +742,7 @@ static unsigned int ttm_pool_alloc_find_order(unsigned int highest,
 }
 
 static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
+			    bool memcg_account,
 			    const struct ttm_operation_ctx *ctx,
 			    struct ttm_pool_alloc_state *alloc,
 			    struct ttm_pool_tt_restore *restore)
@@ -852,6 +853,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
  * Returns: 0 on successe, negative error code otherwise.
  */
 int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
+		   bool memcg_account,
 		   struct ttm_operation_ctx *ctx)
 {
 	struct ttm_pool_alloc_state alloc;
@@ -861,7 +863,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 
 	ttm_pool_alloc_state_init(tt, &alloc);
 
-	return __ttm_pool_alloc(pool, tt, ctx, &alloc, NULL);
+	return __ttm_pool_alloc(pool, tt, memcg_account, ctx, &alloc, NULL);
 }
 EXPORT_SYMBOL(ttm_pool_alloc);
 
@@ -914,7 +916,7 @@ int ttm_pool_restore_and_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 			return 0;
 	}
 
-	return __ttm_pool_alloc(pool, tt, ctx, &alloc, tt->restore);
+	return __ttm_pool_alloc(pool, tt, false, ctx, &alloc, tt->restore);
 }
 
 /**
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 506e257dfba8..8f38de3b2f1c 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -366,7 +366,9 @@ int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
 EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_swapout);
 
 int ttm_tt_populate(struct ttm_device *bdev,
-		    struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
+		    struct ttm_tt *ttm,
+		    bool memcg_account,
+		    struct ttm_operation_ctx *ctx)
 {
 	int ret;
 
@@ -395,9 +397,9 @@ int ttm_tt_populate(struct ttm_device *bdev,
 	}
 
 	if (bdev->funcs->ttm_tt_populate)
-		ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
+		ret = bdev->funcs->ttm_tt_populate(bdev, ttm, memcg_account, ctx);
 	else
-		ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
+		ret = ttm_pool_alloc(&bdev->pool, ttm, memcg_account, ctx);
 	if (ret)
 		goto error;
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c b/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c
index fa5841fda659..a4d4ebf585fe 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c
@@ -569,13 +569,13 @@ int vmw_bo_cpu_blit(struct vmw_bo *vmw_dst,
 		dma_resv_assert_held(src->base.resv);
 
 	if (!ttm_tt_is_populated(dst->ttm)) {
-		ret = dst->bdev->funcs->ttm_tt_populate(dst->bdev, dst->ttm, &ctx);
+		ret = dst->bdev->funcs->ttm_tt_populate(dst->bdev, dst->ttm, false, &ctx);
 		if (ret)
 			return ret;
 	}
 
 	if (!ttm_tt_is_populated(src->ttm)) {
-		ret = src->bdev->funcs->ttm_tt_populate(src->bdev, src->ttm, &ctx);
+		ret = src->bdev->funcs->ttm_tt_populate(src->bdev, src->ttm, false, &ctx);
 		if (ret)
 			return ret;
 	}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
index 5553892d7c3e..2351dafc1c68 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
@@ -360,7 +360,8 @@ static void vmw_ttm_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
 
 
 static int vmw_ttm_populate(struct ttm_device *bdev,
-			    struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
+			    struct ttm_tt *ttm, bool memcg_account,
+			    struct ttm_operation_ctx *ctx)
 {
 	bool external = (ttm->page_flags & TTM_TT_FLAG_EXTERNAL) != 0;
 
@@ -372,7 +373,7 @@ static int vmw_ttm_populate(struct ttm_device *bdev,
 						       ttm->dma_address,
 						       ttm->num_pages);
 
-	return ttm_pool_alloc(&bdev->pool, ttm, ctx);
+	return ttm_pool_alloc(&bdev->pool, ttm, memcg_account, ctx);
 }
 
 static void vmw_ttm_unpopulate(struct ttm_device *bdev,
@@ -580,7 +581,7 @@ int vmw_bo_create_and_populate(struct vmw_private *dev_priv,
 	if (unlikely(ret != 0))
 		return ret;
 
-	ret = vmw_ttm_populate(vbo->tbo.bdev, vbo->tbo.ttm, &ctx);
+	ret = vmw_ttm_populate(vbo->tbo.bdev, vbo->tbo.ttm, false, &ctx);
 	if (likely(ret == 0)) {
 		struct vmw_ttm_tt *vmw_tt =
 			container_of(vbo->tbo.ttm, struct vmw_ttm_tt, dma_ttm);
diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index 1be2415966df..af684c61e7c6 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -516,6 +516,7 @@ static struct ttm_tt *xe_ttm_tt_create(struct ttm_buffer_object *ttm_bo,
 }
 
 static int xe_ttm_tt_populate(struct ttm_device *ttm_dev, struct ttm_tt *tt,
+			      bool memcg_account,
 			      struct ttm_operation_ctx *ctx)
 {
 	struct xe_ttm_tt *xe_tt = container_of(tt, struct xe_ttm_tt, ttm);
@@ -533,7 +534,7 @@ static int xe_ttm_tt_populate(struct ttm_device *ttm_dev, struct ttm_tt *tt,
 		err = ttm_tt_restore(ttm_dev, tt, ctx);
 	} else {
 		ttm_tt_clear_backed_up(tt);
-		err = ttm_pool_alloc(&ttm_dev->pool, tt, ctx);
+		err = ttm_pool_alloc(&ttm_dev->pool, tt, memcg_account, ctx);
 	}
 	if (err)
 		return err;
diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h
index 479b7ed075c0..6edff0ec9b72 100644
--- a/include/drm/ttm/ttm_bo.h
+++ b/include/drm/ttm/ttm_bo.h
@@ -465,6 +465,7 @@ pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
 		     pgprot_t tmp);
 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
 int ttm_bo_populate(struct ttm_buffer_object *bo,
+		    bool memcg_account,
 		    struct ttm_operation_ctx *ctx);
 
 /* Driver LRU walk helpers initially targeted for shrinking. */
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
index 592b5f802859..dcecb06b67b3 100644
--- a/include/drm/ttm/ttm_device.h
+++ b/include/drm/ttm/ttm_device.h
@@ -84,6 +84,7 @@ struct ttm_device_funcs {
 	 */
 	int (*ttm_tt_populate)(struct ttm_device *bdev,
 			       struct ttm_tt *ttm,
+			       bool memcg_account,
 			       struct ttm_operation_ctx *ctx);
 
 	/**
diff --git a/include/drm/ttm/ttm_pool.h b/include/drm/ttm/ttm_pool.h
index df56527c4853..da5b94226203 100644
--- a/include/drm/ttm/ttm_pool.h
+++ b/include/drm/ttm/ttm_pool.h
@@ -79,6 +79,7 @@ struct ttm_pool {
 };
 
 int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
+		   bool memcg_account,
 		   struct ttm_operation_ctx *ctx);
 void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt);
 
diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h
index 406437ad674b..15d4019685f6 100644
--- a/include/drm/ttm/ttm_tt.h
+++ b/include/drm/ttm/ttm_tt.h
@@ -250,6 +250,7 @@ int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
  * Calls the driver method to allocate pages for a ttm
  */
 int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm,
+		    bool memcg_account,
 		    struct ttm_operation_ctx *ctx);
 
 /**
-- 
2.50.1

[PATCH 09/15] ttm/pool: initialise the shrinker earlier

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

Later memcg enablement needs the shrinker initialised before the list lru,
Just move it for now.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/ttm/ttm_pool.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 9a8b4f824bc1..2c9969de7517 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -1381,6 +1381,17 @@ int ttm_pool_mgr_init(unsigned long num_pages)
 	spin_lock_init(&shrinker_lock);
 	INIT_LIST_HEAD(&shrinker_list);
 
+	mm_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "drm-ttm_pool");
+	if (!mm_shrinker)
+		return -ENOMEM;
+
+	mm_shrinker->count_objects = ttm_pool_shrinker_count;
+	mm_shrinker->scan_objects = ttm_pool_shrinker_scan;
+	mm_shrinker->batch = TTM_SHRINKER_BATCH;
+	mm_shrinker->seeks = 1;
+
+	shrinker_register(mm_shrinker);
+
 	for (i = 0; i < NR_PAGE_ORDERS; ++i) {
 		ttm_pool_type_init(&global_write_combined[i], NULL,
 				   ttm_write_combined, i);
@@ -1403,17 +1414,6 @@ int ttm_pool_mgr_init(unsigned long num_pages)
 #endif
 #endif
 
-	mm_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "drm-ttm_pool");
-	if (!mm_shrinker)
-		return -ENOMEM;
-
-	mm_shrinker->count_objects = ttm_pool_shrinker_count;
-	mm_shrinker->scan_objects = ttm_pool_shrinker_scan;
-	mm_shrinker->batch = TTM_SHRINKER_BATCH;
-	mm_shrinker->seeks = 1;
-
-	shrinker_register(mm_shrinker);
-
 	return 0;
 }
 
-- 
2.50.1

Re: [PATCH 09/15] ttm/pool: initialise the shrinker earlier

[Christian König]

On 02.09.25 06:06, Dave Airlie wrote:
> From: Dave Airlie <airlied@redhat.com>
> 
> Later memcg enablement needs the shrinker initialised before the list lru,
> Just move it for now.

Hui? That should just be the other way around.

The shrinker depends on the list lru and so needs to come after ttm_pool_type_init() and not before.

Regards,
Christian.

> 
> Signed-off-by: Dave Airlie <airlied@redhat.com>
> ---
>  drivers/gpu/drm/ttm/ttm_pool.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
> index 9a8b4f824bc1..2c9969de7517 100644
> --- a/drivers/gpu/drm/ttm/ttm_pool.c
> +++ b/drivers/gpu/drm/ttm/ttm_pool.c
> @@ -1381,6 +1381,17 @@ int ttm_pool_mgr_init(unsigned long num_pages)
>  	spin_lock_init(&shrinker_lock);
>  	INIT_LIST_HEAD(&shrinker_list);
>  
> +	mm_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "drm-ttm_pool");
> +	if (!mm_shrinker)
> +		return -ENOMEM;
> +
> +	mm_shrinker->count_objects = ttm_pool_shrinker_count;
> +	mm_shrinker->scan_objects = ttm_pool_shrinker_scan;
> +	mm_shrinker->batch = TTM_SHRINKER_BATCH;
> +	mm_shrinker->seeks = 1;
> +
> +	shrinker_register(mm_shrinker);
> +
>  	for (i = 0; i < NR_PAGE_ORDERS; ++i) {
>  		ttm_pool_type_init(&global_write_combined[i], NULL,
>  				   ttm_write_combined, i);
> @@ -1403,17 +1414,6 @@ int ttm_pool_mgr_init(unsigned long num_pages)
>  #endif
>  #endif
>  
> -	mm_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "drm-ttm_pool");
> -	if (!mm_shrinker)
> -		return -ENOMEM;
> -
> -	mm_shrinker->count_objects = ttm_pool_shrinker_count;
> -	mm_shrinker->scan_objects = ttm_pool_shrinker_scan;
> -	mm_shrinker->batch = TTM_SHRINKER_BATCH;
> -	mm_shrinker->seeks = 1;
> -
> -	shrinker_register(mm_shrinker);
> -
>  	return 0;
>  }
>  

[PATCH 10/15] ttm: add objcg pointer to bo and tt

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This just adds the obj cgroup pointer to the bo and tt structs,
and sets it between them.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/ttm/ttm_tt.c | 1 +
 include/drm/ttm/ttm_bo.h     | 6 ++++++
 include/drm/ttm/ttm_tt.h     | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 8f38de3b2f1c..0c54d5e2bfdd 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -162,6 +162,7 @@ static void ttm_tt_init_fields(struct ttm_tt *ttm,
 	ttm->caching = caching;
 	ttm->restore = NULL;
 	ttm->backup = NULL;
+	ttm->objcg = bo->objcg;
 }
 
 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h
index 6edff0ec9b72..c33b3667ae76 100644
--- a/include/drm/ttm/ttm_bo.h
+++ b/include/drm/ttm/ttm_bo.h
@@ -135,6 +135,12 @@ struct ttm_buffer_object {
 	 * reservation lock.
 	 */
 	struct sg_table *sg;
+
+	/**
+	 * @objcg: object cgroup to charge this to if it ends up using system memory.
+	 * NULL means don't charge.
+	 */
+	struct obj_cgroup *objcg;
 };
 
 #define TTM_BO_MAP_IOMEM_MASK 0x80
diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h
index 15d4019685f6..c13fea4c2915 100644
--- a/include/drm/ttm/ttm_tt.h
+++ b/include/drm/ttm/ttm_tt.h
@@ -126,6 +126,8 @@ struct ttm_tt {
 	enum ttm_caching caching;
 	/** @restore: Partial restoration from backup state. TTM private */
 	struct ttm_pool_tt_restore *restore;
+	/** @objcg: Object cgroup for this TT allocation */
+	struct obj_cgroup *objcg;
 };
 
 /**
-- 
2.50.1

[PATCH 11/15] ttm/pool: enable memcg tracking and shrinker. (v2)

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This enables all the backend code to use the list lru in memcg mode,
and set the shrinker to be memcg aware.

It adds the loop case for when pooled pages end up being reparented
to a higher memcg group, that newer memcg can search for them there
and take them back.

Signed-off-by: Dave Airlie <airlied@redhat.com>

---
v2: just use the proper stats.
---
 drivers/gpu/drm/ttm/ttm_pool.c | 127 ++++++++++++++++++++++++++-------
 mm/list_lru.c                  |   1 +
 2 files changed, 104 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 2c9969de7517..1e6da2cc1f06 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -142,7 +142,9 @@ static int ttm_pool_nid(struct ttm_pool *pool) {
 }
 
 /* Allocate pages of size 1 << order with the given gfp_flags */
-static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
+static struct page *ttm_pool_alloc_page(struct ttm_pool *pool,
+					struct obj_cgroup *objcg,
+					gfp_t gfp_flags,
 					unsigned int order)
 {
 	unsigned long attr = DMA_ATTR_FORCE_CONTIGUOUS;
@@ -162,7 +164,10 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
 		p = alloc_pages_node(pool->nid, gfp_flags, order);
 		if (p) {
 			p->private = order;
-			mod_lruvec_page_state(p, NR_GPU_ACTIVE, 1 << order);
+			if (!mem_cgroup_charge_gpu_page(objcg, p, order, gfp_flags, false)) {
+				__free_pages(p, order);
+				return NULL;
+			}
 		}
 		return p;
 	}
@@ -213,8 +218,7 @@ static void ttm_pool_free_page(struct ttm_pool *pool, enum ttm_caching caching,
 #endif
 
 	if (!pool || !pool->use_dma_alloc) {
-		mod_lruvec_page_state(p, reclaim ? NR_GPU_RECLAIM : NR_GPU_ACTIVE,
-				      -(1 << order));
+		mem_cgroup_uncharge_gpu_page(p, order, reclaim);
 		__free_pages(p, order);
 		return;
 	}
@@ -301,12 +305,11 @@ static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p)
 
 	INIT_LIST_HEAD(&p->lru);
 	rcu_read_lock();
-	list_lru_add(&pt->pages, &p->lru, nid, NULL);
+	list_lru_add(&pt->pages, &p->lru, nid, page_memcg_check(p));
 	rcu_read_unlock();
 
-	atomic_long_add(num_pages, &allocated_pages[nid]);	
-	mod_lruvec_page_state(p, NR_GPU_ACTIVE, -num_pages);
-	mod_lruvec_page_state(p, NR_GPU_RECLAIM, num_pages);
+	atomic_long_add(num_pages, &allocated_pages[nid]);
+	mem_cgroup_move_gpu_page_reclaim(NULL, p, pt->order, true);
 }
 
 static enum lru_status take_one_from_lru(struct list_head *item,
@@ -321,20 +324,56 @@ static enum lru_status take_one_from_lru(struct list_head *item,
 	return LRU_REMOVED;
 }
 
-/* Take pages from a specific pool_type, return NULL when nothing available */
-static struct page *ttm_pool_type_take(struct ttm_pool_type *pt, int nid)
+static int pool_lru_get_page(struct ttm_pool_type *pt, int nid,
+			     struct page **page_out,
+			     struct obj_cgroup *objcg,
+			     struct mem_cgroup *memcg)
 {
 	int ret;
 	struct page *p = NULL;
 	unsigned long nr_to_walk = 1;
+	unsigned int num_pages = 1 << pt->order;
 
-	ret = list_lru_walk_node(&pt->pages, nid, take_one_from_lru, (void *)&p, &nr_to_walk);
+	ret = list_lru_walk_one(&pt->pages, nid, memcg, take_one_from_lru, (void *)&p, &nr_to_walk);
 	if (ret == 1 && p) {
-		atomic_long_sub(1 << pt->order, &allocated_pages[nid]);
-		mod_lruvec_page_state(p, NR_GPU_ACTIVE, (1 << pt->order));
-		mod_lruvec_page_state(p, NR_GPU_RECLAIM, -(1 << pt->order));		
+		atomic_long_sub(num_pages, &allocated_pages[nid]);
+
+		if (!mem_cgroup_move_gpu_page_reclaim(objcg, p, pt->order, false)) {
+			__free_pages(p, pt->order);
+			p = NULL;
+		}
 	}
-	return p;
+	*page_out = p;
+	return ret;
+}
+
+/* Take pages from a specific pool_type, return NULL when nothing available */
+static struct page *ttm_pool_type_take(struct ttm_pool_type *pt, int nid,
+				       struct obj_cgroup *orig_objcg)
+{
+	struct page *page_out = NULL;
+	int ret;
+	struct mem_cgroup *orig_memcg = orig_objcg ? get_mem_cgroup_from_objcg(orig_objcg) : NULL;
+	struct mem_cgroup *memcg = orig_memcg;
+
+	/*
+	 * Attempt to get a page from the current memcg, but if it hasn't got any in it's level,
+	 * go up to the parent and check there. This helps the scenario where multiple apps get
+	 * started into their own cgroup from a common parent and want to reuse the pools.
+	 */
+	while (!page_out) {
+		ret = pool_lru_get_page(pt, nid, &page_out, orig_objcg, memcg);
+		if (ret == 1)
+			break;
+		if (!memcg)
+			break;
+		memcg = parent_mem_cgroup(memcg);
+		if (!memcg)
+			break;
+	}
+
+	mem_cgroup_put(orig_memcg);
+	return page_out;
 }
 
 /* Initialize and add a pool type to the global shrinker list */
@@ -344,7 +383,7 @@ static void ttm_pool_type_init(struct ttm_pool_type *pt, struct ttm_pool *pool,
 	pt->pool = pool;
 	pt->caching = caching;
 	pt->order = order;
-	list_lru_init(&pt->pages);
+	list_lru_init_memcg(&pt->pages, mm_shrinker);
 
 	spin_lock(&shrinker_lock);
 	list_add_tail(&pt->shrinker_list, &shrinker_list);
@@ -387,6 +426,30 @@ static void ttm_pool_type_fini(struct ttm_pool_type *pt)
 	ttm_pool_dispose_list(pt, &dispose);
 }
 
+static int ttm_pool_check_objcg(struct obj_cgroup *objcg)
+{
+#ifdef CONFIG_MEMCG
+	int r = 0;
+	struct mem_cgroup *memcg;
+	if (!objcg)
+		return 0;
+
+	memcg = get_mem_cgroup_from_objcg(objcg);
+	for (unsigned i = 0; i < NR_PAGE_ORDERS; i++) {
+		r = memcg_list_lru_alloc(memcg, &global_write_combined[i].pages, GFP_KERNEL);
+		if (r) {
+			break;
+		}
+		r = memcg_list_lru_alloc(memcg, &global_uncached[i].pages, GFP_KERNEL);
+		if (r) {
+			break;
+		}
+	}
+	mem_cgroup_put(memcg);
+#endif
+	return 0;
+}
+
 /* Return the pool_type to use for the given caching and order */
 static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool,
 						  enum ttm_caching caching,
@@ -416,7 +479,9 @@ static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool,
 }
 
 /* Free pages using the per-node shrinker list */
-static unsigned int ttm_pool_shrink(int nid, unsigned long num_to_free)
+static unsigned int ttm_pool_shrink(int nid,
+				    struct mem_cgroup *memcg,
+				    unsigned long num_to_free)
 {
 	LIST_HEAD(dispose);
 	struct ttm_pool_type *pt;
@@ -428,7 +493,11 @@ static unsigned int ttm_pool_shrink(int nid, unsigned long num_to_free)
 	list_move_tail(&pt->shrinker_list, &shrinker_list);
 	spin_unlock(&shrinker_lock);
 
-	num_pages = list_lru_walk_node(&pt->pages, nid, pool_move_to_dispose_list, &dispose, &num_to_free);
+	if (!memcg) {
+		num_pages = list_lru_walk_node(&pt->pages, nid, pool_move_to_dispose_list, &dispose, &num_to_free);
+	} else {
+		num_pages = list_lru_walk_one(&pt->pages, nid, memcg, pool_move_to_dispose_list, &dispose, &num_to_free);
+	}
 	num_pages *= 1 << pt->order;
 
 	ttm_pool_dispose_list(pt, &dispose);
@@ -593,6 +662,7 @@ static int ttm_pool_restore_commit(struct ttm_pool_tt_restore *restore,
 			 */
 			ttm_pool_split_for_swap(restore->pool, p);
 			copy_highpage(restore->alloced_page + i, p);
+			p->memcg_data = 0;
 			__free_pages(p, 0);
 		}
 
@@ -754,6 +824,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 	bool allow_pools;
 	struct page *p;
 	int r;
+	struct obj_cgroup *objcg = memcg_account ? tt->objcg : NULL;
 
 	WARN_ON(!alloc->remaining_pages || ttm_tt_is_populated(tt));
 	WARN_ON(alloc->dma_addr && !pool->dev);
@@ -771,6 +842,9 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 
 	page_caching = tt->caching;
 	allow_pools = true;
+
+	ttm_pool_check_objcg(objcg);
+
 	for (order = ttm_pool_alloc_find_order(MAX_PAGE_ORDER, alloc);
 	     alloc->remaining_pages;
 	     order = ttm_pool_alloc_find_order(order, alloc)) {
@@ -780,7 +854,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 		p = NULL;
 		pt = ttm_pool_select_type(pool, page_caching, order);
 		if (pt && allow_pools)
-			p = ttm_pool_type_take(pt, ttm_pool_nid(pool));
+			p = ttm_pool_type_take(pt, ttm_pool_nid(pool), objcg);
 
 		/*
 		 * If that fails or previously failed, allocate from system.
@@ -791,7 +865,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 		if (!p) {
 			page_caching = ttm_cached;
 			allow_pools = false;
-			p = ttm_pool_alloc_page(pool, gfp_flags, order);
+			p = ttm_pool_alloc_page(pool, objcg, gfp_flags, order);
 		}
 		/* If that fails, lower the order if possible and retry. */
 		if (!p) {
@@ -935,7 +1009,7 @@ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt)
 
 	while (atomic_long_read(&allocated_pages[nid]) > pool_node_limit[nid]) {
 		unsigned long diff = pool_node_limit[nid] - atomic_long_read(&allocated_pages[nid]);
-		ttm_pool_shrink(nid, diff);
+		ttm_pool_shrink(nid, NULL, diff);
 	}
 }
 EXPORT_SYMBOL(ttm_pool_free);
@@ -1055,6 +1129,7 @@ long ttm_pool_backup(struct ttm_pool *pool, struct ttm_tt *tt,
 			if (flags->purge) {
 				shrunken += num_pages;
 				page->private = 0;
+				page->memcg_data = 0;
 				__free_pages(page, order);
 				memset(tt->pages + i, 0,
 				       num_pages * sizeof(*tt->pages));
@@ -1191,10 +1266,14 @@ static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
 					    struct shrink_control *sc)
 {
 	unsigned long num_freed = 0;
+	int num_pools;
+	spin_lock(&shrinker_lock);
+	num_pools = list_count_nodes(&shrinker_list);
+	spin_unlock(&shrinker_lock);
 
 	do
-		num_freed += ttm_pool_shrink(sc->nid, sc->nr_to_scan);
-	while (num_freed < sc->nr_to_scan &&
+		num_freed += ttm_pool_shrink(sc->nid, sc->memcg, sc->nr_to_scan);
+	while (num_pools-- >= 0 && num_freed < sc->nr_to_scan &&
 	       atomic_long_read(&allocated_pages[sc->nid]));
 
 	sc->nr_scanned = num_freed;
@@ -1381,7 +1460,7 @@ int ttm_pool_mgr_init(unsigned long num_pages)
 	spin_lock_init(&shrinker_lock);
 	INIT_LIST_HEAD(&shrinker_list);
 
-	mm_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "drm-ttm_pool");
+	mm_shrinker = shrinker_alloc(SHRINKER_MEMCG_AWARE | SHRINKER_NUMA_AWARE, "drm-ttm_pool");
 	if (!mm_shrinker)
 		return -ENOMEM;
 
diff --git a/mm/list_lru.c b/mm/list_lru.c
index 627589d75320..6a277f479dc3 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -562,6 +562,7 @@ int memcg_list_lru_alloc(struct mem_cgroup *memcg, struct list_lru *lru,
 
 	return xas_error(&xas);
 }
+EXPORT_SYMBOL_GPL(memcg_list_lru_alloc);
 #else
 static inline void memcg_init_list_lru(struct list_lru *lru, bool memcg_aware)
 {
-- 
2.50.1

Re: [PATCH 11/15] ttm/pool: enable memcg tracking and shrinker. (v2)

[Christian König]

On 02.09.25 06:06, Dave Airlie wrote:
> From: Dave Airlie <airlied@redhat.com>
> 
> This enables all the backend code to use the list lru in memcg mode,
> and set the shrinker to be memcg aware.
> 
> It adds the loop case for when pooled pages end up being reparented
> to a higher memcg group, that newer memcg can search for them there
> and take them back.

I can only repeat that as far as I can see that makes no sense at all.

This just enables stealing pages from the page pool per cgroup and won't give them back if another cgroup runs into a low memery situation.

Maybe Thomas and the XE guys have an use case for that, but as far as I can see that behavior is not something we would ever want.

Regards,
Christian.

> 
> Signed-off-by: Dave Airlie <airlied@redhat.com>
> 
> ---
> v2: just use the proper stats.
> ---
>  drivers/gpu/drm/ttm/ttm_pool.c | 127 ++++++++++++++++++++++++++-------
>  mm/list_lru.c                  |   1 +
>  2 files changed, 104 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
> index 2c9969de7517..1e6da2cc1f06 100644
> --- a/drivers/gpu/drm/ttm/ttm_pool.c
> +++ b/drivers/gpu/drm/ttm/ttm_pool.c
> @@ -142,7 +142,9 @@ static int ttm_pool_nid(struct ttm_pool *pool) {
>  }
>  
>  /* Allocate pages of size 1 << order with the given gfp_flags */
> -static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
> +static struct page *ttm_pool_alloc_page(struct ttm_pool *pool,
> +					struct obj_cgroup *objcg,
> +					gfp_t gfp_flags,
>  					unsigned int order)
>  {
>  	unsigned long attr = DMA_ATTR_FORCE_CONTIGUOUS;
> @@ -162,7 +164,10 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
>  		p = alloc_pages_node(pool->nid, gfp_flags, order);
>  		if (p) {
>  			p->private = order;
> -			mod_lruvec_page_state(p, NR_GPU_ACTIVE, 1 << order);
> +			if (!mem_cgroup_charge_gpu_page(objcg, p, order, gfp_flags, false)) {
> +				__free_pages(p, order);
> +				return NULL;
> +			}
>  		}
>  		return p;
>  	}
> @@ -213,8 +218,7 @@ static void ttm_pool_free_page(struct ttm_pool *pool, enum ttm_caching caching,
>  #endif
>  
>  	if (!pool || !pool->use_dma_alloc) {
> -		mod_lruvec_page_state(p, reclaim ? NR_GPU_RECLAIM : NR_GPU_ACTIVE,
> -				      -(1 << order));
> +		mem_cgroup_uncharge_gpu_page(p, order, reclaim);
>  		__free_pages(p, order);
>  		return;
>  	}
> @@ -301,12 +305,11 @@ static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p)
>  
>  	INIT_LIST_HEAD(&p->lru);
>  	rcu_read_lock();
> -	list_lru_add(&pt->pages, &p->lru, nid, NULL);
> +	list_lru_add(&pt->pages, &p->lru, nid, page_memcg_check(p));
>  	rcu_read_unlock();
>  
> -	atomic_long_add(num_pages, &allocated_pages[nid]);	
> -	mod_lruvec_page_state(p, NR_GPU_ACTIVE, -num_pages);
> -	mod_lruvec_page_state(p, NR_GPU_RECLAIM, num_pages);
> +	atomic_long_add(num_pages, &allocated_pages[nid]);
> +	mem_cgroup_move_gpu_page_reclaim(NULL, p, pt->order, true);
>  }
>  
>  static enum lru_status take_one_from_lru(struct list_head *item,
> @@ -321,20 +324,56 @@ static enum lru_status take_one_from_lru(struct list_head *item,
>  	return LRU_REMOVED;
>  }
>  
> -/* Take pages from a specific pool_type, return NULL when nothing available */
> -static struct page *ttm_pool_type_take(struct ttm_pool_type *pt, int nid)
> +static int pool_lru_get_page(struct ttm_pool_type *pt, int nid,
> +			     struct page **page_out,
> +			     struct obj_cgroup *objcg,
> +			     struct mem_cgroup *memcg)
>  {
>  	int ret;
>  	struct page *p = NULL;
>  	unsigned long nr_to_walk = 1;
> +	unsigned int num_pages = 1 << pt->order;
>  
> -	ret = list_lru_walk_node(&pt->pages, nid, take_one_from_lru, (void *)&p, &nr_to_walk);
> +	ret = list_lru_walk_one(&pt->pages, nid, memcg, take_one_from_lru, (void *)&p, &nr_to_walk);
>  	if (ret == 1 && p) {
> -		atomic_long_sub(1 << pt->order, &allocated_pages[nid]);
> -		mod_lruvec_page_state(p, NR_GPU_ACTIVE, (1 << pt->order));
> -		mod_lruvec_page_state(p, NR_GPU_RECLAIM, -(1 << pt->order));		
> +		atomic_long_sub(num_pages, &allocated_pages[nid]);
> +
> +		if (!mem_cgroup_move_gpu_page_reclaim(objcg, p, pt->order, false)) {
> +			__free_pages(p, pt->order);
> +			p = NULL;
> +		}
>  	}
> -	return p;
> +	*page_out = p;
> +	return ret;
> +}
> +
> +/* Take pages from a specific pool_type, return NULL when nothing available */
> +static struct page *ttm_pool_type_take(struct ttm_pool_type *pt, int nid,
> +				       struct obj_cgroup *orig_objcg)
> +{
> +	struct page *page_out = NULL;
> +	int ret;
> +	struct mem_cgroup *orig_memcg = orig_objcg ? get_mem_cgroup_from_objcg(orig_objcg) : NULL;
> +	struct mem_cgroup *memcg = orig_memcg;
> +
> +	/*
> +	 * Attempt to get a page from the current memcg, but if it hasn't got any in it's level,
> +	 * go up to the parent and check there. This helps the scenario where multiple apps get
> +	 * started into their own cgroup from a common parent and want to reuse the pools.
> +	 */
> +	while (!page_out) {
> +		ret = pool_lru_get_page(pt, nid, &page_out, orig_objcg, memcg);
> +		if (ret == 1)
> +			break;
> +		if (!memcg)
> +			break;
> +		memcg = parent_mem_cgroup(memcg);
> +		if (!memcg)
> +			break;
> +	}
> +
> +	mem_cgroup_put(orig_memcg);
> +	return page_out;
>  }
>  
>  /* Initialize and add a pool type to the global shrinker list */
> @@ -344,7 +383,7 @@ static void ttm_pool_type_init(struct ttm_pool_type *pt, struct ttm_pool *pool,
>  	pt->pool = pool;
>  	pt->caching = caching;
>  	pt->order = order;
> -	list_lru_init(&pt->pages);
> +	list_lru_init_memcg(&pt->pages, mm_shrinker);
>  
>  	spin_lock(&shrinker_lock);
>  	list_add_tail(&pt->shrinker_list, &shrinker_list);
> @@ -387,6 +426,30 @@ static void ttm_pool_type_fini(struct ttm_pool_type *pt)
>  	ttm_pool_dispose_list(pt, &dispose);
>  }
>  
> +static int ttm_pool_check_objcg(struct obj_cgroup *objcg)
> +{
> +#ifdef CONFIG_MEMCG
> +	int r = 0;
> +	struct mem_cgroup *memcg;
> +	if (!objcg)
> +		return 0;
> +
> +	memcg = get_mem_cgroup_from_objcg(objcg);
> +	for (unsigned i = 0; i < NR_PAGE_ORDERS; i++) {
> +		r = memcg_list_lru_alloc(memcg, &global_write_combined[i].pages, GFP_KERNEL);
> +		if (r) {
> +			break;
> +		}
> +		r = memcg_list_lru_alloc(memcg, &global_uncached[i].pages, GFP_KERNEL);
> +		if (r) {
> +			break;
> +		}
> +	}
> +	mem_cgroup_put(memcg);
> +#endif
> +	return 0;
> +}
> +
>  /* Return the pool_type to use for the given caching and order */
>  static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool,
>  						  enum ttm_caching caching,
> @@ -416,7 +479,9 @@ static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool,
>  }
>  
>  /* Free pages using the per-node shrinker list */
> -static unsigned int ttm_pool_shrink(int nid, unsigned long num_to_free)
> +static unsigned int ttm_pool_shrink(int nid,
> +				    struct mem_cgroup *memcg,
> +				    unsigned long num_to_free)
>  {
>  	LIST_HEAD(dispose);
>  	struct ttm_pool_type *pt;
> @@ -428,7 +493,11 @@ static unsigned int ttm_pool_shrink(int nid, unsigned long num_to_free)
>  	list_move_tail(&pt->shrinker_list, &shrinker_list);
>  	spin_unlock(&shrinker_lock);
>  
> -	num_pages = list_lru_walk_node(&pt->pages, nid, pool_move_to_dispose_list, &dispose, &num_to_free);
> +	if (!memcg) {
> +		num_pages = list_lru_walk_node(&pt->pages, nid, pool_move_to_dispose_list, &dispose, &num_to_free);
> +	} else {
> +		num_pages = list_lru_walk_one(&pt->pages, nid, memcg, pool_move_to_dispose_list, &dispose, &num_to_free);
> +	}
>  	num_pages *= 1 << pt->order;
>  
>  	ttm_pool_dispose_list(pt, &dispose);
> @@ -593,6 +662,7 @@ static int ttm_pool_restore_commit(struct ttm_pool_tt_restore *restore,
>  			 */
>  			ttm_pool_split_for_swap(restore->pool, p);
>  			copy_highpage(restore->alloced_page + i, p);
> +			p->memcg_data = 0;
>  			__free_pages(p, 0);
>  		}
>  
> @@ -754,6 +824,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
>  	bool allow_pools;
>  	struct page *p;
>  	int r;
> +	struct obj_cgroup *objcg = memcg_account ? tt->objcg : NULL;
>  
>  	WARN_ON(!alloc->remaining_pages || ttm_tt_is_populated(tt));
>  	WARN_ON(alloc->dma_addr && !pool->dev);
> @@ -771,6 +842,9 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
>  
>  	page_caching = tt->caching;
>  	allow_pools = true;
> +
> +	ttm_pool_check_objcg(objcg);
> +
>  	for (order = ttm_pool_alloc_find_order(MAX_PAGE_ORDER, alloc);
>  	     alloc->remaining_pages;
>  	     order = ttm_pool_alloc_find_order(order, alloc)) {
> @@ -780,7 +854,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
>  		p = NULL;
>  		pt = ttm_pool_select_type(pool, page_caching, order);
>  		if (pt && allow_pools)
> -			p = ttm_pool_type_take(pt, ttm_pool_nid(pool));
> +			p = ttm_pool_type_take(pt, ttm_pool_nid(pool), objcg);
>  
>  		/*
>  		 * If that fails or previously failed, allocate from system.
> @@ -791,7 +865,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
>  		if (!p) {
>  			page_caching = ttm_cached;
>  			allow_pools = false;
> -			p = ttm_pool_alloc_page(pool, gfp_flags, order);
> +			p = ttm_pool_alloc_page(pool, objcg, gfp_flags, order);
>  		}
>  		/* If that fails, lower the order if possible and retry. */
>  		if (!p) {
> @@ -935,7 +1009,7 @@ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt)
>  
>  	while (atomic_long_read(&allocated_pages[nid]) > pool_node_limit[nid]) {
>  		unsigned long diff = pool_node_limit[nid] - atomic_long_read(&allocated_pages[nid]);
> -		ttm_pool_shrink(nid, diff);
> +		ttm_pool_shrink(nid, NULL, diff);
>  	}
>  }
>  EXPORT_SYMBOL(ttm_pool_free);
> @@ -1055,6 +1129,7 @@ long ttm_pool_backup(struct ttm_pool *pool, struct ttm_tt *tt,
>  			if (flags->purge) {
>  				shrunken += num_pages;
>  				page->private = 0;
> +				page->memcg_data = 0;
>  				__free_pages(page, order);
>  				memset(tt->pages + i, 0,
>  				       num_pages * sizeof(*tt->pages));
> @@ -1191,10 +1266,14 @@ static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
>  					    struct shrink_control *sc)
>  {
>  	unsigned long num_freed = 0;
> +	int num_pools;
> +	spin_lock(&shrinker_lock);
> +	num_pools = list_count_nodes(&shrinker_list);
> +	spin_unlock(&shrinker_lock);
>  
>  	do
> -		num_freed += ttm_pool_shrink(sc->nid, sc->nr_to_scan);
> -	while (num_freed < sc->nr_to_scan &&
> +		num_freed += ttm_pool_shrink(sc->nid, sc->memcg, sc->nr_to_scan);
> +	while (num_pools-- >= 0 && num_freed < sc->nr_to_scan &&
>  	       atomic_long_read(&allocated_pages[sc->nid]));
>  
>  	sc->nr_scanned = num_freed;
> @@ -1381,7 +1460,7 @@ int ttm_pool_mgr_init(unsigned long num_pages)
>  	spin_lock_init(&shrinker_lock);
>  	INIT_LIST_HEAD(&shrinker_list);
>  
> -	mm_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "drm-ttm_pool");
> +	mm_shrinker = shrinker_alloc(SHRINKER_MEMCG_AWARE | SHRINKER_NUMA_AWARE, "drm-ttm_pool");
>  	if (!mm_shrinker)
>  		return -ENOMEM;
>  
> diff --git a/mm/list_lru.c b/mm/list_lru.c
> index 627589d75320..6a277f479dc3 100644
> --- a/mm/list_lru.c
> +++ b/mm/list_lru.c
> @@ -562,6 +562,7 @@ int memcg_list_lru_alloc(struct mem_cgroup *memcg, struct list_lru *lru,
>  
>  	return xas_error(&xas);
>  }
> +EXPORT_SYMBOL_GPL(memcg_list_lru_alloc);
>  #else
>  static inline void memcg_init_list_lru(struct list_lru *lru, bool memcg_aware)
>  {

[PATCH 12/15] ttm: hook up memcg placement flags.

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This adds a placement flag that requests that any bo with this
placement flag set gets accounted for memcg if it's a system memory
allocation.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c      | 2 +-
 drivers/gpu/drm/ttm/ttm_bo_util.c | 6 +++---
 drivers/gpu/drm/ttm/ttm_bo_vm.c   | 2 +-
 include/drm/ttm/ttm_placement.h   | 3 +++
 4 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index af04bb8e2c2a..273757974b9f 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -142,7 +142,7 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 			goto out_err;
 
 		if (mem->mem_type != TTM_PL_SYSTEM) {
-			ret = ttm_bo_populate(bo, false, ctx);
+			ret = ttm_bo_populate(bo, mem->placement & TTM_PL_FLAG_MEMCG, ctx);
 			if (ret)
 				goto out_err;
 		}
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 13a9e9bba968..dc43804658b4 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -167,7 +167,7 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 	src_man = ttm_manager_type(bdev, src_mem->mem_type);
 	if (ttm && ((ttm->page_flags & TTM_TT_FLAG_SWAPPED) ||
 		    dst_man->use_tt)) {
-		ret = ttm_bo_populate(bo, false, ctx);
+		ret = ttm_bo_populate(bo, dst_mem->placement & TTM_PL_FLAG_MEMCG, ctx);
 		if (ret)
 			return ret;
 	}
@@ -355,7 +355,7 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 
 	BUG_ON(!ttm);
 
-	ret = ttm_bo_populate(bo, false, &ctx);
+	ret = ttm_bo_populate(bo, mem->placement & TTM_PL_FLAG_MEMCG, &ctx);
 	if (ret)
 		return ret;
 
@@ -538,7 +538,7 @@ int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map)
 		pgprot_t prot;
 		void *vaddr;
 
-		ret = ttm_bo_populate(bo, false, &ctx);
+		ret = ttm_bo_populate(bo, mem->placement & TTM_PL_FLAG_MEMCG, &ctx);
 		if (ret)
 			return ret;
 
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index c5ad447debe3..dddc904f8727 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -226,7 +226,7 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
 
 		ttm = bo->ttm;
 		err = ttm_bo_populate(bo,
-				      false,
+				      bo->resource->placement & TTM_PL_FLAG_MEMCG,
 				      &ctx);
 		if (err) {
 			if (err == -EINTR || err == -ERESTARTSYS ||
diff --git a/include/drm/ttm/ttm_placement.h b/include/drm/ttm/ttm_placement.h
index b510a4812609..4e9f07d70483 100644
--- a/include/drm/ttm/ttm_placement.h
+++ b/include/drm/ttm/ttm_placement.h
@@ -70,6 +70,9 @@
 /* Placement is only used during eviction */
 #define TTM_PL_FLAG_FALLBACK	(1 << 4)
 
+/* Placement should account mem cgroup */
+#define TTM_PL_FLAG_MEMCG	(1 << 5)
+
 /**
  * struct ttm_place
  *
-- 
2.50.1

[PATCH 13/15] memcontrol: allow objcg api when memcg is config off.

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

amdgpu wants to use the objcg api and not have to enable ifdef
around it, so just add a dummy function for the config off path.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 include/linux/memcontrol.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d7cfb9925db5..e5cffb0adeda 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1794,6 +1794,11 @@ static inline void __memcg_kmem_uncharge_page(struct page *page, int order)
 {
 }
 
+static inline struct obj_cgroup *get_obj_cgroup_from_current(void)
+{
+	return NULL;
+}
+
 static inline struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio)
 {
 	return NULL;
-- 
2.50.1

[PATCH 14/15] amdgpu: add support for memory cgroups

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This adds support for adding a obj cgroup to a buffer object,
and passing in the placement flags to make sure it's accounted
properly.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c    |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 13 +++++++++----
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    |  2 ++
 mm/memcontrol.c                            |  1 +
 5 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index d1ccbfcf21fa..a01fe7594e3a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -198,6 +198,7 @@ static void amdgpu_gem_object_free(struct drm_gem_object *gobj)
 	struct amdgpu_bo *aobj = gem_to_amdgpu_bo(gobj);
 
 	amdgpu_hmm_unregister(aobj);
+	obj_cgroup_put(aobj->tbo.objcg);
 	ttm_bo_put(&aobj->tbo);
 }
 
@@ -225,6 +226,7 @@ int amdgpu_gem_object_create(struct amdgpu_device *adev, unsigned long size,
 	bp.domain = initial_domain;
 	bp.bo_ptr_size = sizeof(struct amdgpu_bo);
 	bp.xcp_id_plus1 = xcp_id_plus1;
+	bp.objcg = get_obj_cgroup_from_current();
 
 	r = amdgpu_bo_create_user(adev, &bp, &ubo);
 	if (r)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 122a88294883..cbd09c680d33 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -159,7 +159,7 @@ void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
 		places[c].mem_type =
 			abo->flags & AMDGPU_GEM_CREATE_PREEMPTIBLE ?
 			AMDGPU_PL_PREEMPT : TTM_PL_TT;
-		places[c].flags = 0;
+		places[c].flags = TTM_PL_FLAG_MEMCG;
 		/*
 		 * When GTT is just an alternative to VRAM make sure that we
 		 * only use it as fallback and still try to fill up VRAM first.
@@ -174,7 +174,7 @@ void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
 		places[c].fpfn = 0;
 		places[c].lpfn = 0;
 		places[c].mem_type = TTM_PL_SYSTEM;
-		places[c].flags = 0;
+		places[c].flags = TTM_PL_FLAG_MEMCG;
 		c++;
 	}
 
@@ -654,16 +654,21 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
 		size = ALIGN(size, PAGE_SIZE);
 	}
 
-	if (!amdgpu_bo_validate_size(adev, size, bp->domain))
+	if (!amdgpu_bo_validate_size(adev, size, bp->domain)) {
+		obj_cgroup_put(bp->objcg);
 		return -ENOMEM;
+	}
 
 	BUG_ON(bp->bo_ptr_size < sizeof(struct amdgpu_bo));
 
 	*bo_ptr = NULL;
 	bo = kvzalloc(bp->bo_ptr_size, GFP_KERNEL);
-	if (bo == NULL)
+	if (bo == NULL) {
+		obj_cgroup_put(bp->objcg);
 		return -ENOMEM;
+	}
 	drm_gem_private_object_init(adev_to_drm(adev), &bo->tbo.base, size);
+	bo->tbo.objcg = bp->objcg;
 	bo->tbo.base.funcs = &amdgpu_gem_object_funcs;
 	bo->vm_bo = NULL;
 	bo->preferred_domains = bp->preferred_domain ? bp->preferred_domain :
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index c316920f3450..8cccbe62e328 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -55,6 +55,7 @@ struct amdgpu_bo_param {
 	enum ttm_bo_type		type;
 	bool				no_wait_gpu;
 	struct dma_resv			*resv;
+	struct obj_cgroup               *objcg;
 	void				(*destroy)(struct ttm_buffer_object *bo);
 	/* xcp partition number plus 1, 0 means any partition */
 	int8_t				xcp_id_plus1;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index f71431e8e6b9..a3fa28e5a43e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -151,11 +151,13 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
 			amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_GTT |
 							AMDGPU_GEM_DOMAIN_CPU);
 		}
+		abo->placements[0].flags &= ~TTM_PL_FLAG_MEMCG;
 		break;
 	case TTM_PL_TT:
 	case AMDGPU_PL_PREEMPT:
 	default:
 		amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
+		abo->placements[0].flags &= ~TTM_PL_FLAG_MEMCG;
 		break;
 	}
 	*placement = abo->placement;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3d637c7e10cf..e4dc0cc43bc9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2722,6 +2722,7 @@ __always_inline struct obj_cgroup *current_obj_cgroup(void)
 
 	return objcg;
 }
+EXPORT_SYMBOL_GPL(current_obj_cgroup);
 
 struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio)
 {
-- 
2.50.1

[PATCH 15/15] ttm: add support for a module option to disable memcg integration

[Dave Airlie]

From: Dave Airlie <airlied@redhat.com>

This adds a kconfig and a module option to turn off ttm memcg
integration completely.

When this is used, no object will ever end up using memcg aware
paths.

There is an existing workload that cgroup support might regress,
the systems are setup to allocate 1GB of uncached pages at system
startup to prime the pool, then any further users will take them
from the pool. The current cgroup code might handle that, but
it also may regress, so add an option to ttm to avoid using
memcg for the pool pages.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/Kconfig        |  7 +++++++
 drivers/gpu/drm/ttm/ttm_pool.c | 24 +++++++++++++++++++++---
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index f7ea8e895c0c..4a1501b05e7c 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -239,6 +239,13 @@ config DRM_TTM_HELPER
 	help
 	  Helpers for ttm-based gem objects
 
+config DRM_TTM_MEMCG
+	bool "Enable TTM mem cgroup by default"
+	depends on DRM_TTM
+	depends on MEMCG
+	help
+	  Enable the memcg intergration by default
+
 config DRM_GEM_DMA_HELPER
 	tristate
 	depends on DRM
diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 1e6da2cc1f06..009e7016bd4c 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -118,6 +118,24 @@ static unsigned long page_pool_size;
 MODULE_PARM_DESC(page_pool_size, "Number of pages in the WC/UC/DMA pool per NUMA node");
 module_param(page_pool_size, ulong, 0644);
 
+/*
+ * Don't use the memcg aware lru for pooled pages.
+ *
+ * There are use-cases where for example one application in a cgroup will preallocate 1GB
+ * of uncached pages, and immediately release them into the pool, for other consumers
+ * to use. This use-case could be handled with a proper cgroup hierarchy, but to allow
+ * that use case to continue to operate as-is, add a module option.
+ *
+ * This still stores the pages in the list_lru, it just doesn't use the memcg when
+ * adding/removing them.
+ */
+#define DEFAULT_TTM_MEMCG IS_ENABLED(CONFIG_DRM_TTM_MEMCG)
+static bool ttm_memcg = DEFAULT_TTM_MEMCG;
+
+MODULE_PARM_DESC(ttm_memcg, "Allow using cgroups with TTM "
+		 "[default=" __stringify(DEFAULT_TTM_MEMCG) "])");
+module_param(ttm_memcg, bool, 0444);
+
 static unsigned long pool_node_limit[MAX_NUMNODES];
 static atomic_long_t allocated_pages[MAX_NUMNODES];
 
@@ -305,7 +323,7 @@ static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p)
 
 	INIT_LIST_HEAD(&p->lru);
 	rcu_read_lock();
-	list_lru_add(&pt->pages, &p->lru, nid, page_memcg_check(p));
+	list_lru_add(&pt->pages, &p->lru, nid, ttm_memcg ? page_memcg_check(p) : NULL);
 	rcu_read_unlock();
 
 	atomic_long_add(num_pages, &allocated_pages[nid]);
@@ -354,7 +372,7 @@ static struct page *ttm_pool_type_take(struct ttm_pool_type *pt, int nid,
 	struct page *page_out = NULL;
 	int ret;
 	struct mem_cgroup *orig_memcg = orig_objcg ? get_mem_cgroup_from_objcg(orig_objcg) : NULL;
-	struct mem_cgroup *memcg = orig_memcg;
+	struct mem_cgroup *memcg = ttm_memcg ? orig_memcg : NULL;
 
 	/*
 	 * Attempt to get a page from the current memcg, but if it hasn't got any in it's level,
@@ -824,7 +842,7 @@ static int __ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
 	bool allow_pools;
 	struct page *p;
 	int r;
-	struct obj_cgroup *objcg = memcg_account ? tt->objcg : NULL;
+	struct obj_cgroup *objcg = (ttm_memcg && memcg_account) ? tt->objcg : NULL;
 
 	WARN_ON(!alloc->remaining_pages || ttm_tt_is_populated(tt));
 	WARN_ON(alloc->dma_addr && !pool->dev);
-- 
2.50.1