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

Submitted by Konstantin Khorenko on Feb. 19, 2018, 4:19 p.m.

Details

Message ID 201802191619.w1JGJBIH001861@finist_ce7.work
State New
Series "Series without cover letter"
Headers show

Commit Message

Konstantin Khorenko Feb. 19, 2018, 4:19 p.m.
The commit is pushed to "branch-rh7-3.10.0-693.17.1.vz7.45.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-693.17.1.vz7.45.3
------>
commit 82ddc4c43f2d97c5c0d009072e5b06acf3f3a241
Author: Andrey Ryabinin <aryabinin@virtuozzo.com>
Date:   Mon Feb 19 19:19:10 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@virtuozzo.com>
    Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
 kernel/fork.c | 4 ++++
 1 file changed, 4 insertions(+)

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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)