Re: [tip:sched/core] sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target

[Zefan Li]

>> Commit-ID:  80e3d87b2c5582db0ab5e39610ce3707d97ba409
>> Gitweb:     http://git.kernel.org/tip/80e3d87b2c5582db0ab5e39610ce3707d97ba409
>> Author:     Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
>> AuthorDate: Fri, 12 Dec 2014 15:38:12 -0800
>> Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
>> CommitDate: Fri, 30 Jan 2015 19:38:49 +0100
>>
>> sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target
>>
>> This patch adds checks that prevens futile attempts to move rt tasks
>> to a CPU with active tasks of equal or higher priority.
>>
>> This reduces run queue lock contention and improves the performance of
>> a well known OLTP benchmark by 0.7%.
>>
>> Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
>> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
>> Cc: Shawn Bohrer <sbohrer@xxxxxxxxxxxxxxx>
>> Cc: Suruchi Kadu <suruchi.a.kadu@xxxxxxxxx>
>> Cc: Doug Nelson<doug.nelson@xxxxxxxxx>
>> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
>> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
>> Link: http://lkml.kernel.org/r/1421430374.2399.27.camel@xxxxxxxxxxxxxxxxxxxxxxxxx
>> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
> 
> I see this has been added to mainline already. I think this should go
> to stable as well. As far back as it applies. I'll even add this to the
> stable-rt if need be. But I rather pull it into stable-rt via the
> stable branches.
> 

Queued up for 3.4. Thanks!

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/