[Devel] [PATCH RHEL8 COMMIT] memcg: Enable accounting for signals

[Konstantin Khorenko]

The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.18
------>
commit 2b164a669b9f4bb2e16fddd8b11217ceadd10d60
Author: Vasily Averin <vvs at virtuozzo.com>
Date:   Tue Apr 20 19:35:01 2021 +0300

    memcg: Enable accounting for signals
    
    User can send signals to another processes and force kernel to allocate
    memory for 'struct sigqueue' objects. Number of signals is restricted by
    RLIMIT_SIGPENDING per-task resource limit, though alive signals can
    consume significant piece of memory.
    
    It makes sense to account for these allocations to restrict the host's
    memory consumption from inside the memcg-limited container.
    
    Old virtuozzo versions accounted this memory, but it was lost during
    vz7 rebase.
    
    https://jira.sw.ru/browse/PSBM-128624
    Signed-off-by: Vasily Averin <vvs at virtuozzo.com>
---
 kernel/signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 171f7496f811..aa8025687930 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -4354,7 +4354,7 @@ void __init signals_init(void)
 {
 	siginfo_buildtime_checks();
 
-	sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
+	sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC | SLAB_ACCOUNT);
 }
 
 #ifdef CONFIG_KGDB_KDB