The patch titled
Subject: mm/kmemleak.c: make cond_resched() rate-limiting more efficient
has been added to the -mm tree. Its filename is
mm-kmemleakc-make-cond_resched-rate-limiting-more-efficient.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-kmemleakc-make-cond_resched-rate-limiting-more-efficient.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-kmemleakc-make-cond_resched-rate-limiting-more-efficient.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm/kmemleak.c: make cond_resched() rate-limiting more efficient
bde5f6bc68db5 ("kmemleak: add scheduling point to kmemleak_scan()") tries
to rate-limit the frequency of cond_resched() calls, but does it in a way
which might incur an expensive division operation in the inner loop.
Simplify this.
Fixes: bde5f6bc68db5 ("kmemleak: add scheduling point to kmemleak_scan()")
Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Yisheng Xie <xieyisheng1@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmemleak.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/kmemleak.c~mm-kmemleakc-make-cond_resched-rate-limiting-more-efficient mm/kmemleak.c
--- a/mm/kmemleak.c~mm-kmemleakc-make-cond_resched-rate-limiting-more-efficient
+++ a/mm/kmemleak.c
@@ -1523,7 +1523,7 @@ static void kmemleak_scan(void)
if (page_count(page) == 0)
continue;
scan_block(page, page + 1, NULL);
- if (!(pfn % (MAX_SCAN_SIZE / sizeof(*page))))
+ if (!(pfn & 63))
cond_resched();
}
}
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
i-need-old-gcc.patch
mm-kmemleakc-make-cond_resched-rate-limiting-more-efficient.patch
arm-arch-arm-include-asm-pageh-needs-personalityh.patch
mm.patch
include-linux-sched-mmh-uninline-mmdrop_async-etc.patch
mm-do-not-stall-register_shrinker-fix.patch
selftest-vm-move-128tb-mmap-boundary-test-to-generic-directory-fix.patch
list_lru-prefetch-neighboring-list-entries-before-acquiring-lock-fix.patch
linux-next-rejects.patch
linux-next-git-rejects.patch
tools-objtool-makefile-dont-assume-sync-checksh-is-executable.patch
kernel-forkc-export-kernel_thread-to-modules.patch
slab-leaks3-default-y.patch
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