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| author | Li Zefan <lizefan@huawei.com> | 2014-04-04 01:46:27 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-04 03:20:50 +0400 |
| commit | c89da70c7360294e715df5abd4b7239db3274c86 (patch) | |
| tree | b7b8107c361f84f5ca2a27f1a2c6542e60154630 /Documentation/kmemleak.txt | |
| parent | dc9b3f424903f7d6992778b69b1e35d864914ae5 (diff) | |
| download | linux-c89da70c7360294e715df5abd4b7239db3274c86.tar.xz | |
kmemleak: allow freeing internal objects after kmemleak was disabled
Currently if kmemleak is disabled, the kmemleak objects can never be
freed, no matter if it's disabled by a user or due to fatal errors.
Those objects can be a big waste of memory.
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
1200264 1197433 99% 0.30K 46164 26 369312K kmemleak_object
With this patch, after kmemleak was disabled you can reclaim memory
with:
# echo clear > /sys/kernel/debug/kmemleak
Also inform users about this with a printk.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/kmemleak.txt')
| -rw-r--r-- | Documentation/kmemleak.txt | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/kmemleak.txt b/Documentation/kmemleak.txt index b6e39739a36d..6c18be97f3dd 100644 --- a/Documentation/kmemleak.txt +++ b/Documentation/kmemleak.txt @@ -53,7 +53,8 @@ Memory scanning parameters can be modified at run-time by writing to the (default 600, 0 to stop the automatic scanning) scan - trigger a memory scan clear - clear list of current memory leak suspects, done by - marking all current reported unreferenced objects grey + marking all current reported unreferenced objects grey, + or free all kmemleak objects if kmemleak has been disabled. dump=<addr> - dump information about the object found at <addr> Kmemleak can also be disabled at boot-time by passing "kmemleak=off" on @@ -120,6 +121,18 @@ Then as usual to get your report with: # cat /sys/kernel/debug/kmemleak +Freeing kmemleak internal objects +--------------------------------- + +To allow access to previosuly found memory leaks after kmemleak has been +disabled by the user or due to an fatal error, internal kmemleak objects +won't be freed when kmemleak is disabled, and those objects may occupy +a large part of physical memory. + +In this situation, you may reclaim memory with: + + # echo clear > /sys/kernel/debug/kmemleak + Kmemleak API ------------ |