The patch titled
Subject: mm/kmemleak: compact kmemleak_object further
has been added to the -mm mm-unstable branch. Its filename is
mm-kmemleak-compact-kmemleak_object-further.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-kmemleak-compact-kmemleak_object-further.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Waiman Long <longman@xxxxxxxxxx>
Subject: mm/kmemleak: compact kmemleak_object further
Date: Thu, 7 Mar 2024 14:05:47 -0500
Patch series "mm/kmemleak: Minor cleanup & performance tuning".
This series contains 2 simple cleanup patches to slightly reduce memory
and performance overhead.
This patch (of 2):
With commit 56a61617dd22 ("mm: use stack_depot for recording kmemleak's
backtrace"), the size of kmemleak_object has been reduced by 128 bytes for
64-bit arches. The replacement "depot_stack_handle_t trace_handle" is
actually just 4 bytes long leaving a hole of 4 bytes. By moving up
trace_handle to another existing 4-byte hold, we can save 8 more bytes
from kmemleak_object reducing its overall size from 248 to 240 bytes.
Link: https://lkml.kernel.org/r/20240307190548.963626-1-longman@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20240307190548.963626-2-longman@xxxxxxxxxx
Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmemleak.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/kmemleak.c~mm-kmemleak-compact-kmemleak_object-further
+++ a/mm/kmemleak.c
@@ -158,9 +158,9 @@ struct kmemleak_object {
int count;
/* checksum for detecting modified objects */
u32 checksum;
+ depot_stack_handle_t trace_handle;
/* memory ranges to be scanned inside an object (empty for all) */
struct hlist_head area_list;
- depot_stack_handle_t trace_handle;
unsigned long jiffies; /* creation timestamp */
pid_t pid; /* pid of the current task */
char comm[TASK_COMM_LEN]; /* executable name */
_
Patches currently in -mm which might be from longman@xxxxxxxxxx are
mm-kmemleak-compact-kmemleak_object-further.patch
mm-kmemleak-disable-kasan-instrumentation-in-kmemleak.patch
