From c89da70c7360294e715df5abd4b7239db3274c86 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 3 Apr 2014 14:46:27 -0700 Subject: 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 Acked-by: Catalin Marinas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/kmemleak.txt | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'Documentation/kmemleak.txt') 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= - dump information about the object found at 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 ------------ -- cgit