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alloc_tag: skip pgalloc_tag_swap if profiling is disabled

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When memory allocation profiling is disabled, there is no need to swap
allocation tags during migration.  Skip it to avoid unnecessary overhead.

Once I added these checks, the overhead of the mode when memory profiling
is enabled but turned off went down by about 50%.

Link: https://lkml.kernel.org/r/20241226211639.1357704-2-surenb@google.com
Fixes: e0a955bf7f ("mm/codetag: add pgalloc_tag_copy()")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Cc: David Wang <00107082@163.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Zhenhua Huang <quic_zhenhuah@quicinc.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2024-12-26 13:16:39 -08:00 • committed by Andrew Morton
parent 9726891fe7
commit 05c82ee363
1 changed files with 3 additions and 0 deletions
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3
lib/alloc_tag.c
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@ -195,6 +195,9 @@ void pgalloc_tag_swap(struct folio *new, struct folio *old)
union codetag_ref ref_old, ref_new; union codetag_ref ref_old, ref_new;
struct alloc_tag *tag_old, *tag_new; struct alloc_tag *tag_old, *tag_new;
if (!mem_alloc_profiling_enabled())
return;
tag_old = pgalloc_tag_get(&old->page); tag_old = pgalloc_tag_get(&old->page);
if (!tag_old) if (!tag_old)
return; return;