[PATCH 30/40] mm: percpu: Add codetag reference into pcpuobj_ext

Suren Baghdasaryan
2023-05-01T17:02:12Z

From: Kent Overstreet <kent.overstreet@linux.dev>

To store codetag for every per-cpu allocation, a codetag reference is
embedded into pcpuobj_ext when CONFIG_MEM_ALLOC_PROFILING=y. Hooks to
use the newly introduced codetag are added.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
mm/percpu-internal.h | 11 +++++++++--
mm/percpu.c | 26 ++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index 2433e7b24172..c5d1d6723a66 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -36,9 +36,12 @@ struct pcpuobj_ext {
#ifdef CONFIG_MEMCG_KMEM
struct obj_cgroup *cgroup;
#endif
+#ifdef CONFIG_MEM_ALLOC_PROFILING
+ union codetag_ref tag;
+#endif
};

-#ifdef CONFIG_MEMCG_KMEM
+#if defined(CONFIG_MEMCG_KMEM) || defined(CONFIG_MEM_ALLOC_PROFILING)
#define NEED_PCPUOBJ_EXT
#endif

@@ -79,7 +82,11 @@ struct pcpu_chunk {

static inline bool need_pcpuobj_ext(void)
{
- return !mem_cgroup_kmem_disabled();
+ if (IS_ENABLED(CONFIG_MEM_ALLOC_PROFILING))
+ return true;
+ if (!mem_cgroup_kmem_disabled())
+ return true;
+ return false;
}

extern spinlock_t pcpu_lock;
diff --git a/mm/percpu.c b/mm/percpu.c
index 95b26a6b718d..4e2592f2e58f 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1701,6 +1701,32 @@ static void pcpu_memcg_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
}
#endif /* CONFIG_MEMCG_KMEM */

+#ifdef CONFIG_MEM_ALLOC_PROFILING
+static void pcpu_alloc_tag_alloc_hook(struct pcpu_chunk *chunk, int off,
+ size_t size)
+{
+ if (mem_alloc_profiling_enabled() && likely(chunk->obj_exts)) {
+ alloc_tag_add(&chunk->obj_exts[off >> PCPU_MIN_ALLOC_SHIFT].tag,
+ current->alloc_tag, size);
+ }
+}
+
+static void pcpu_alloc_tag_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
+{
+ if (mem_alloc_profiling_enabled() && likely(chunk->obj_exts))
+ alloc_tag_sub_noalloc(&chunk->obj_exts[off >> PCPU_MIN_ALLOC_SHIFT].tag, size);
+}
+#else
+static void pcpu_alloc_tag_alloc_hook(struct pcpu_chunk *chunk, int off,
+ size_t size)
+{
+}
+
+static void pcpu_alloc_tag_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
+{
+}
+#endif
+
/**
* pcpu_alloc - the percpu allocator
* @size: size of area to allocate in bytes
--
2.40.1.495.gc816e09b53d-goog