The quilt patch titled Subject: alloc_tag: skip pgalloc_tag_swap if profiling is disabled has been removed from the -mm tree. Its filename was alloc_tag-skip-pgalloc_tag_swap-if-profiling-is-disabled.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------ From: Suren Baghdasaryan surenb@google.com Subject: alloc_tag: skip pgalloc_tag_swap if profiling is disabled Date: Thu, 26 Dec 2024 13:16:39 -0800

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: e0a955bf7f61 ("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 ---

lib/alloc_tag.c | 3 +++ 1 file changed, 3 insertions(+)

--- a/lib/alloc_tag.c~alloc_tag-skip-pgalloc_tag_swap-if-profiling-is-disabled +++ a/lib/alloc_tag.c @@ -195,6 +195,9 @@ void pgalloc_tag_swap(struct folio *new, union codetag_ref ref_old, ref_new; struct alloc_tag *tag_old, *tag_new;

+ if (!mem_alloc_profiling_enabled()) + return; + tag_old = pgalloc_tag_get(&old->page); if (!tag_old) return; _

Patches currently in -mm which might be from surenb@google.com are

alloc_tag-avoid-current-alloc_tag-manipulations-when-profiling-is-disabled.patch