linux-kernel - [PATCH 2/2] alloc_tag: skip pgalloc_tag

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241226211639.1357704-2-surenb@google.com>
Date: Thu, 26 Dec 2024 13:16:39 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: akpm@...ux-foundation.org
Cc: kent.overstreet@...ux.dev, yuzhao@...gle.com, 00107082@....com, 
	quic_zhenhuah@...cinc.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Suren Baghdasaryan <surenb@...gle.com>, stable@...r.kernel.org
Subject: [PATCH 2/2] alloc_tag: skip pgalloc_tag_swap if profiling is disabled

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

Fixes: e0a955bf7f61 ("mm/codetag: add pgalloc_tag_copy()")
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
Cc: stable@...r.kernel.org
---
 lib/alloc_tag.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 4c373f444eb1..4e5d7af3eaa2 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -197,6 +197,9 @@ void pgalloc_tag_swap(struct folio *new, struct folio *old)
 	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;
-- 
2.47.1.613.gc27f4b7a9f-goog