[Devel] [PATCH RHEL7 COMMIT] ve/kstat/alloc_lat: Initialize alloc_lat to zero at start

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-693.17.1.vz7.43.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-693.17.1.vz7.43.7
------>
commit 1d8faed7b3fc2a21686259156975a69cd2018a5b
Author: Andrey Ryabinin <aryabinin at virtuozzo.com>
Date:   Mon Feb 19 19:22:22 2018 +0300

    ve/kstat/alloc_lat: Initialize alloc_lat to zero at start
    
    It seems that 'struct task_struct' not initialized to zero after
    allocation. Thus we need to initialize alloc_lat explicitly.
    
    https://jira.sw.ru/browse/PSBM-81395
    Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
    Reviewed-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 kernel/fork.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/fork.c b/kernel/fork.c
index 645b489e33e0..112bef1e2695 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -373,6 +373,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
 	tsk->stack_canary = get_random_int();
 #endif
 
+#ifdef CONFIG_VE
+	memset(tsk->alloc_lat, 0, sizeof(tsk->alloc_lat));
+#endif
+
 	/*
 	 * One for us, one for whoever does the "release_task()" (usually
 	 * parent)