[PATCH v14 07/14] mm: multi-gen LRU: exploit locality in rmap

Yu Zhao
2022-08-15T07:15:14Z

Searching the rmap for PTEs mapping each page on an LRU list (to test
and clear the accessed bit) can be expensive because pages from
different VMAs (PA space) are not cache friendly to the rmap (VA
space). For workloads mostly using mapped pages, searching the rmap
can incur the highest CPU cost in the reclaim path.

This patch exploits spatial locality to reduce the trips into the
rmap. When shrink_page_list() walks the rmap and finds a young PTE, a
new function lru_gen_look_around() scans at most BITS_PER_LONG-1
adjacent PTEs. On finding another young PTE, it clears the accessed
bit and updates the gen counter of the page mapped by this PTE to
(max_seq%MAX_NR_GENS)+1.

Server benchmark results:
Single workload:
fio (buffered I/O): no change

Single workload:
memcached (anon): +[3, 5]%
Ops/sec KB/sec
patch1-6: 1106168.46 43025.04
patch1-7: 1147696.57 44640.29

Configurations:
no change

Client benchmark results:
kswapd profiles:
patch1-6
39.03% lzo1x_1_do_compress (real work)
18.47% page_vma_mapped_walk (overhead)
6.74% _raw_spin_unlock_irq
3.97% do_raw_spin_lock
2.49% ptep_clear_flush
2.48% anon_vma_interval_tree_iter_first
1.92% folio_referenced_one
1.88% __zram_bvec_write
1.48% memmove
1.31% vma_interval_tree_iter_next

patch1-7
48.16% lzo1x_1_do_compress (real work)
8.20% page_vma_mapped_walk (overhead)
7.06% _raw_spin_unlock_irq
2.92% ptep_clear_flush
2.53% __zram_bvec_write
2.11% do_raw_spin_lock
2.02% memmove
1.93% lru_gen_look_around
1.56% free_unref_page_list
1.40% memset

Configurations:
no change

Signed-off-by: Yu Zhao <yuzhao@google.com>
Acked-by: Barry Song <baohua@kernel.org>
Acked-by: Brian Geffon <bgeffon@google.com>
Acked-by: Jan Alexander Steffens (heftig) <heftig@archlinux.org>
Acked-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Acked-by: Steven Barrett <steven@liquorix.net>
Acked-by: Suleiman Souhlal <suleiman@google.com>
Tested-by: Daniel Byrne <djbyrne@mtu.edu>
Tested-by: Donald Carr <d@chaos-reins.com>
Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Tested-by: Konstantin Kharlamov <Hi-Angel@yandex.ru>
Tested-by: Shuang Zhai <szhai2@cs.rochester.edu>
Tested-by: Sofia Trinh <sofia.trinh@edi.works>
Tested-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
include/linux/memcontrol.h | 31 +++++++
include/linux/mm.h | 5 +
include/linux/mmzone.h | 6 ++
mm/internal.h | 1 +
mm/memcontrol.c | 1 +
mm/rmap.c | 6 ++
mm/swap.c | 4 +-
mm/vmscan.c | 184 +++++++++++++++++++++++++++++++++++++
8 files changed, 236 insertions(+), 2 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 4d31ce55b1c0..47829f378fcb 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -444,6 +444,7 @@ static inline struct obj_cgroup *__folio_objcg(struct folio *folio)
* - LRU isolation
* - lock_page_memcg()
* - exclusive reference
+ * - mem_cgroup_trylock_pages()
*
* For a kmem folio a caller should hold an rcu read lock to protect memcg
* associated with a kmem folio from being released.
@@ -505,6 +506,7 @@ static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
* - LRU isolation
* - lock_page_memcg()
* - exclusive reference
+ * - mem_cgroup_trylock_pages()
*
* For a kmem page a caller should hold an rcu read lock to protect memcg
* associated with a kmem page from being released.
@@ -959,6 +961,23 @@ void unlock_page_memcg(struct page *page);

void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val);

+/* try to stablize folio_memcg() for all the pages in a memcg */
+static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
+{
+ rcu_read_lock();
+
+ if (mem_cgroup_disabled() || !atomic_read(&memcg->moving_account))
+ return true;
+
+ rcu_read_unlock();
+ return false;
+}
+
+static inline void mem_cgroup_unlock_pages(void)
+{
+ rcu_read_unlock();
+}
+
/* idx can be of type enum memcg_stat_item or node_stat_item */
static inline void mod_memcg_state(struct mem_cgroup *memcg,
int idx, int val)
@@ -1422,6 +1441,18 @@ static inline void folio_memcg_unlock(struct folio *folio)
{
}

+static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
+{
+ /* to match folio_memcg_rcu() */
+ rcu_read_lock();
+ return true;
+}
+
+static inline void mem_cgroup_unlock_pages(void)
+{
+ rcu_read_unlock();
+}
+
static inline void mem_cgroup_handle_over_high(void)
{
}
diff --git a/include/linux/mm.h b/include/linux/mm.h
index fbe2e72e7bca..8ff7227c6cb1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1490,6 +1490,11 @@ static inline unsigned long folio_pfn(struct folio *folio)
return page_to_pfn(&folio->page);
}

+static inline struct folio *pfn_folio(unsigned long pfn)
+{
+ return page_folio(pfn_to_page(pfn));
+}
+
static inline atomic_t *folio_pincount_ptr(struct folio *folio)
{
return &folio_page(folio, 1)->compound_pincount;
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 019d7c8ee834..850c6171af68 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -375,6 +375,7 @@ enum lruvec_flags {
#ifndef __GENERATING_BOUNDS_H

struct lruvec;
+struct page_vma_mapped_walk;

#define LRU_GEN_MASK ((BIT(LRU_GEN_WIDTH) - 1) << LRU_GEN_PGOFF)
#define LRU_REFS_MASK ((BIT(LRU_REFS_WIDTH) - 1) << LRU_REFS_PGOFF)
@@ -430,6 +431,7 @@ struct lru_gen_struct {
};

void lru_gen_init_lruvec(struct lruvec *lruvec);
+void lru_gen_look_around(struct page_vma_mapped_walk *pvmw);

#ifdef CONFIG_MEMCG
void lru_gen_init_memcg(struct mem_cgroup *memcg);
@@ -442,6 +444,10 @@ static inline void lru_gen_init_lruvec(struct lruvec *lruvec)
{
}

+static inline void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
+{
+}
+
#ifdef CONFIG_MEMCG
static inline void lru_gen_init_memcg(struct mem_cgroup *memcg)
{
diff --git a/mm/internal.h b/mm/internal.h
index 4df67b6b8cce..0082d5fdddac 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -83,6 +83,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf);
void folio_rotate_reclaimable(struct folio *folio);
bool __folio_end_writeback(struct folio *folio);
void deactivate_file_folio(struct folio *folio);
+void folio_activate(struct folio *folio);

void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5fd38d12149c..882180866e31 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2789,6 +2789,7 @@ static void commit_charge(struct folio *folio, struct mem_cgroup *memcg)
* - LRU isolation
* - lock_page_memcg()
* - exclusive reference
+ * - mem_cgroup_trylock_pages()
*/
folio->memcg_data = (unsigned long)memcg;
}
diff --git a/mm/rmap.c b/mm/rmap.c
index 28aef434ea41..7dc6d77ae865 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -825,6 +825,12 @@ static bool folio_referenced_one(struct folio *folio,
}

if (pvmw.pte) {
+ if (lru_gen_enabled() && pte_young(*pvmw.pte) &&
+ !(vma->vm_flags & (VM_SEQ_READ | VM_RAND_READ))) {
+ lru_gen_look_around(&pvmw);
+ referenced++;
+ }
+
if (ptep_clear_flush_young_notify(vma, address,
pvmw.pte)) {
/*
diff --git a/mm/swap.c b/mm/swap.c
index f74fd51fa9e1..0a3871a70952 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -366,7 +366,7 @@ static void folio_activate_drain(int cpu)
folio_batch_move_lru(fbatch, folio_activate_fn);
}

-static void folio_activate(struct folio *folio)
+void folio_activate(struct folio *folio)
{
if (folio_test_lru(folio) && !folio_test_active(folio) &&
!folio_test_unevictable(folio)) {
@@ -385,7 +385,7 @@ static inline void folio_activate_drain(int cpu)
{
}

-static void folio_activate(struct folio *folio)
+void folio_activate(struct folio *folio)
{
struct lruvec *lruvec;

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4c57fb749a74..f365386eb441 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1635,6 +1635,11 @@ static unsigned int shrink_page_list(struct list_head *page_list,
if (!sc->may_unmap && folio_mapped(folio))
goto keep_locked;

+ /* folio_update_gen() tried to promote this page? */
+ if (lru_gen_enabled() && !ignore_references &&
+ folio_mapped(folio) && folio_test_referenced(folio))
+ goto keep_locked;
+
/*
* The number of dirty pages determines if a node is marked
* reclaim_congested. kswapd will stall and start writing
@@ -3219,6 +3224,29 @@ static bool positive_ctrl_err(struct ctrl_pos *sp, struct ctrl_pos *pv)
* the aging
******************************************************************************/

+/* promote pages accessed through page tables */
+static int folio_update_gen(struct folio *folio, int gen)
+{
+ unsigned long new_flags, old_flags = READ_ONCE(folio->flags);
+
+ VM_WARN_ON_ONCE(gen >= MAX_NR_GENS);
+ VM_WARN_ON_ONCE(!rcu_read_lock_held());
+
+ do {
+ /* lru_gen_del_folio() has isolated this page? */
+ if (!(old_flags & LRU_GEN_MASK)) {
+ /* for shrink_page_list() */
+ new_flags = old_flags | BIT(PG_referenced);
+ continue;
+ }
+
+ new_flags = old_flags & ~(LRU_GEN_MASK | LRU_REFS_MASK | LRU_REFS_FLAGS);
+ new_flags |= (gen + 1UL) << LRU_GEN_PGOFF;
+ } while (!try_cmpxchg(&folio->flags, &old_flags, new_flags));
+
+ return ((old_flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1;
+}
+
/* protect pages accessed multiple times through file descriptors */
static int folio_inc_gen(struct lruvec *lruvec, struct folio *folio, bool reclaiming)
{
@@ -3230,6 +3258,11 @@ static int folio_inc_gen(struct lruvec *lruvec, struct folio *folio, bool reclai
VM_WARN_ON_ONCE_FOLIO(!(old_flags & LRU_GEN_MASK), folio);

do {
+ new_gen = ((old_flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1;
+ /* folio_update_gen() has promoted this page? */
+ if (new_gen >= 0 && new_gen != old_gen)
+ return new_gen;
+
new_gen = (old_gen + 1) % MAX_NR_GENS;

new_flags = old_flags & ~(LRU_GEN_MASK | LRU_REFS_MASK | LRU_REFS_FLAGS);
@@ -3244,6 +3277,43 @@ static int folio_inc_gen(struct lruvec *lruvec, struct folio *folio, bool reclai
return new_gen;
}

+static unsigned long get_pte_pfn(pte_t pte, struct vm_area_struct *vma, unsigned long addr)
+{
+ unsigned long pfn = pte_pfn(pte);
+
+ VM_WARN_ON_ONCE(addr < vma->vm_start || addr >= vma->vm_end);
+
+ if (!pte_present(pte) || is_zero_pfn(pfn))
+ return -1;
+
+ if (WARN_ON_ONCE(pte_devmap(pte) || pte_special(pte)))
+ return -1;
+
+ if (WARN_ON_ONCE(!pfn_valid(pfn)))
+ return -1;
+
+ return pfn;
+}
+
+static struct folio *get_pfn_folio(unsigned long pfn, struct mem_cgroup *memcg,
+ struct pglist_data *pgdat)
+{
+ struct folio *folio;
+
+ /* try to avoid unnecessary memory loads */
+ if (pfn < pgdat->node_start_pfn || pfn >= pgdat_end_pfn(pgdat))
+ return NULL;
+
+ folio = pfn_folio(pfn);
+ if (folio_nid(folio) != pgdat->node_id)
+ return NULL;
+
+ if (folio_memcg_rcu(folio) != memcg)
+ return NULL;
+
+ return folio;
+}
+
static void inc_min_seq(struct lruvec *lruvec, int type)
{
struct lru_gen_struct *lrugen = &lruvec->lrugen;
@@ -3445,6 +3515,114 @@ static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc)
} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)));
}

+/*
+ * This function exploits spatial locality when shrink_page_list() walks the
+ * rmap. It scans the adjacent PTEs of a young PTE and promotes hot pages.
+ */
+void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
+{
+ int i;
+ pte_t *pte;
+ unsigned long start;
+ unsigned long end;
+ unsigned long addr;
+ unsigned long bitmap[BITS_TO_LONGS(MIN_LRU_BATCH)] = {};
+ struct folio *folio = pfn_folio(pvmw->pfn);
+ struct mem_cgroup *memcg = folio_memcg(folio);
+ struct pglist_data *pgdat = folio_pgdat(folio);
+ struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
+ DEFINE_MAX_SEQ(lruvec);
+ int old_gen, new_gen = lru_gen_from_seq(max_seq);
+
+ lockdep_assert_held(pvmw->ptl);
+ VM_WARN_ON_ONCE_FOLIO(folio_test_lru(folio), folio);
+
+ if (spin_is_contended(pvmw->ptl))
+ return;
+
+ start = max(pvmw->address & PMD_MASK, pvmw->vma->vm_start);
+ end = min(pvmw->address | ~PMD_MASK, pvmw->vma->vm_end - 1) + 1;
+
+ if (end - start > MIN_LRU_BATCH * PAGE_SIZE) {
+ if (pvmw->address - start < MIN_LRU_BATCH * PAGE_SIZE / 2)
+ end = start + MIN_LRU_BATCH * PAGE_SIZE;
+ else if (end - pvmw->address < MIN_LRU_BATCH * PAGE_SIZE / 2)
+ start = end - MIN_LRU_BATCH * PAGE_SIZE;
+ else {
+ start = pvmw->address - MIN_LRU_BATCH * PAGE_SIZE / 2;
+ end = pvmw->address + MIN_LRU_BATCH * PAGE_SIZE / 2;
+ }
+ }
+
+ pte = pvmw->pte - (pvmw->address - start) / PAGE_SIZE;
+
+ rcu_read_lock();
+ arch_enter_lazy_mmu_mode();
+
+ for (i = 0, addr = start; addr != end; i++, addr += PAGE_SIZE) {
+ unsigned long pfn;
+
+ pfn = get_pte_pfn(pte[i], pvmw->vma, addr);
+ if (pfn == -1)
+ continue;
+
+ if (!pte_young(pte[i]))
+ continue;
+
+ folio = get_pfn_folio(pfn, memcg, pgdat);
+ if (!folio)
+ continue;
+
+ if (!ptep_test_and_clear_young(pvmw->vma, addr, pte + i))
+ continue;
+
+ if (pte_dirty(pte[i]) && !folio_test_dirty(folio) &&
+ !(folio_test_anon(folio) && folio_test_swapbacked(folio) &&
+ !folio_test_swapcache(folio)))
+ folio_mark_dirty(folio);
+
+ old_gen = folio_lru_gen(folio);
+ if (old_gen < 0)
+ folio_set_referenced(folio);
+ else if (old_gen != new_gen)
+ __set_bit(i, bitmap);
+ }
+
+ arch_leave_lazy_mmu_mode();
+ rcu_read_unlock();
+
+ if (bitmap_weight(bitmap, MIN_LRU_BATCH) < PAGEVEC_SIZE) {
+ for_each_set_bit(i, bitmap, MIN_LRU_BATCH) {
+ folio = pfn_folio(pte_pfn(pte[i]));
+ folio_activate(folio);
+ }
+ return;
+ }
+
+ /* folio_update_gen() requires stable folio_memcg() */
+ if (!mem_cgroup_trylock_pages(memcg))
+ return;
+
+ spin_lock_irq(&lruvec->lru_lock);
+ new_gen = lru_gen_from_seq(lruvec->lrugen.max_seq);
+
+ for_each_set_bit(i, bitmap, MIN_LRU_BATCH) {
+ folio = pfn_folio(pte_pfn(pte[i]));
+ if (folio_memcg_rcu(folio) != memcg)
+ continue;
+
+ old_gen = folio_update_gen(folio, new_gen);
+ if (old_gen < 0 || old_gen == new_gen)
+ continue;
+
+ lru_gen_update_size(lruvec, folio, old_gen, new_gen);
+ }
+
+ spin_unlock_irq(&lruvec->lru_lock);
+
+ mem_cgroup_unlock_pages();
+}
+
/******************************************************************************
* the eviction
******************************************************************************/
@@ -3481,6 +3659,12 @@ static bool sort_folio(struct lruvec *lruvec, struct folio *folio, int tier_idx)
return true;
}

+ /* promoted */
+ if (gen != lru_gen_from_seq(lrugen->min_seq[type])) {
+ list_move(&folio->lru, &lrugen->lists[gen][type][zone]);
+ return true;
+ }
+
/* protected */
if (tier > tier_idx) {
int hist = lru_hist_from_seq(lrugen->min_seq[type]);
--
2.37.1.595.g718a3a8f04-goog