On Tue, 2015-02-24 at 11:12 -0500, Steven Rostedt wrote: > On Sun, 1 Feb 2015 09:52:24 -0800 > tip-bot for Tim Chen <tipbot@xxxxxxxxx> wrote: > > > 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. [...] I've queued this up for 3.2, thanks. Ben. -- Ben Hutchings The world is coming to an end. Please log off.
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