A program may create multiple interval timers using timer_create(). For each timer the kernel preallocates a "queued real-time signal", Consequently, the number of timers is limited by the RLIMIT_SIGPENDING resource limit. The allocated object is quite small, ~250 bytes, but even the default signal limits allow to consume up to 100 megabytes per user.
It makes sense to account for them to limit the host's memory consumption from inside the memcg-limited container. Link: https://lkml.kernel.org/r/57795560-025c-267c-6b1a-dea852d95...@virtuozzo.com Signed-off-by: Vasily Averin <v...@virtuozzo.com> Reviewed-by: Thomas Gleixner <t...@linutronix.de> Reviewed-by: Shakeel Butt <shake...@google.com> Cc: Alexander Viro <v...@zeniv.linux.org.uk> Cc: Alexey Dobriyan <adobri...@gmail.com> Cc: Andrei Vagin <ava...@gmail.com> Cc: Borislav Petkov <b...@alien8.de> Cc: Borislav Petkov <b...@suse.de> Cc: Christian Brauner <christian.brau...@ubuntu.com> Cc: Dmitry Safonov <0x7f454...@gmail.com> Cc: "Eric W. Biederman" <ebied...@xmission.com> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Cc: "H. Peter Anvin" <h...@zytor.com> Cc: Ingo Molnar <mi...@redhat.com> Cc: "J. Bruce Fields" <bfie...@fieldses.org> Cc: Jeff Layton <jlay...@kernel.org> Cc: Jens Axboe <ax...@kernel.dk> Cc: Jiri Slaby <jirisl...@kernel.org> Cc: Johannes Weiner <han...@cmpxchg.org> Cc: Kirill Tkhai <ktk...@virtuozzo.com> Cc: Michal Hocko <mho...@kernel.org> Cc: Oleg Nesterov <o...@redhat.com> Cc: Roman Gushchin <g...@fb.com> Cc: Serge Hallyn <se...@hallyn.com> Cc: Tejun Heo <t...@kernel.org> Cc: Vladimir Davydov <vdavydov....@gmail.com> Cc: Yutian Yang <ngla...@gmail.com> Cc: Zefan Li <lizefa...@bytedance.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> (cherry picked from commit c509723ec27e925bb91a20682c448e95d4bc8c9f) https://jira.sw.ru/browse/PSBM-133990 Signed-off-by: Vasily Averin <v...@virtuozzo.com> --- kernel/time/posix-timers.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index dd5697d7347b..7363f81dc31a 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -273,8 +273,8 @@ static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) static __init int init_posix_timers(void) { posix_timers_cache = kmem_cache_create("posix_timers_cache", - sizeof (struct k_itimer), 0, SLAB_PANIC, - NULL); + sizeof(struct k_itimer), 0, + SLAB_PANIC | SLAB_ACCOUNT, NULL); return 0; } __initcall(init_posix_timers); -- 2.25.1 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
