The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-123.1.2.vz7.5.7
------>
commit 901bf5dd708537e483a90ebcf62af57239e63702
Author: Vladimir Davydov <vdavy...@parallels.com>
Date: Fri May 29 15:49:38 2015 +0400
fairsched: Port diff-fairsched-optimize-sys_fairsched_mvpr
Author: Konstantin Khlebnikov
Email: khlebni...@openvz.org
Subject: fairsched: optimize sys_fairsched_mvpr()
Date: Wed, 08 May 2013 13:59:04 +0400
Remove task_list_lock and optimize for current.
https://jira.sw.ru/browse/PCLIN-26766
Signed-off-by: Konstantin Khlebnikov <khlebni...@openvz.org>
=============================================================================
Related to https://jira.sw.ru/browse/PSBM-33642
Signed-off-by: Vladimir Davydov <vdavy...@parallels.com>
---
kernel/fairsched.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/kernel/fairsched.c b/kernel/fairsched.c
index 3879f8e..40d3eff 100644
--- a/kernel/fairsched.c
+++ b/kernel/fairsched.c
@@ -243,16 +243,17 @@ SYSCALL_DEFINE2(fairsched_mvpr, pid_t, pid, unsigned int,
id)
if (retval)
return retval;
- write_lock_irq(&tasklist_lock);
- tsk = find_task_by_vpid(pid);
+ rcu_read_lock();
+ tsk = current;
+ if (pid != task_pid_vnr(tsk))
+ tsk = find_task_by_vpid(pid);
if (tsk == NULL) {
- write_unlock_irq(&tasklist_lock);
+ rcu_read_unlock();
retval = -ESRCH;
goto out;
}
get_task_struct(tsk);
- write_unlock_irq(&tasklist_lock);
-
+ rcu_read_unlock();
retval = fairsched_move(&node, tsk);
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