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    Subject[PATCH v7 08/10] memcg: enable accounting for posix_timers_cache slab
    Date
    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.

    Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
    Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
    ---
    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 dd5697d..7363f81 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);
    --
    1.8.3.1
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