On Thu, Mar 27, 2014 at 02:29:18AM +0000, Li Zefan wrote: > On 2014/3/22 7:37, Catalin Marinas wrote: > > On 17 Mar 2014, at 04:07, Li Zefan <lizefan@xxxxxxxxxx> wrote: > >> 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, internal objects will be freed immediately if kmemleak is > >> disabled explicitly by a user. If it's disabled due to a kmemleak error, > >> The user will be informed, and then he/she can reclaim memory with: > >> > >> # echo off > /sys/kernel/debug/kmemleak > >> > >> v2: use "off" handler instead of "clear" handler to do this, suggested > >> by Catalin. > > > > I think there was a slight misunderstanding. My point was about "echo > > scan=off” before “echo off”, they can just be squashed into the > > same action of the latter. > > I'm not sure if I understand correctly, so you want the "off" handler to > stop the scan thread but it will never free kmemleak objects until the > user explicitly trigger the "clear" action, right? Yes. That's just in case someone wants to stop kmemleak but still investigate some previously reported leaks. Thanks. -- Catalin -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>