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mm/kmemleak: compact kmemleak_object further

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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@redhat.com
Link: https://lkml.kernel.org/r/20240307190548.963626-2-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Waiman Long 2024-03-07 14:05:47 -05:00 committed by Andrew Morton
parent cc9bc36ebe
commit b04da04220
1 changed files with 1 additions and 1 deletions
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2
mm/kmemleak.c
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@ -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 */