From: Steven Rostedt <rostedt@goodmis.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Xunlei Pang <pang.xunlei@linaro.org>,
linux-kernel@vger.kernel.org, Juri Lelli <juri.lelli@gmail.com>
Subject: Re: [PATCH 5/5] sched/rt: Optimize find_lowest_rq() to select a cache hot cpu
Date: Tue, 27 Jan 2015 09:56:26 -0500 [thread overview]
Message-ID: <20150127095626.707e434d@gandalf.local.home> (raw)
In-Reply-To: <20150127142136.GE21418@twins.programming.kicks-ass.net>
On Tue, 27 Jan 2015 15:21:36 +0100
Peter Zijlstra <peterz@infradead.org> wrote:
> On Mon, Jan 19, 2015 at 04:49:40AM +0000, Xunlei Pang wrote:
> > In find_lowest_rq(), if we can't find a wake_affine cpu from
> > sched_domain, then we can actually determine a cache hot cpu
> > instead of simply calling "cpumask_any(lowest_mask)" which
> > always returns the first cpu in the mask.
> >
> > So, we can determine the cache hot cpu during the interation of
> > sched_domain() in passing.
>
> Steve, I'm not getting this. Why are we using WAKE_AFFINE here?
>
It originated from Gregory Haskins topology patches. See
6e1254d2c41215da27025add8900ed187bca121d
-- Steve
next prev parent reply other threads:[~2015-01-27 14:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-19 4:49 [PATCH 1/5] sched/deadline: Modify cpudl::free_cpus to reflect rd->online Xunlei Pang
2015-01-19 4:49 ` [PATCH 2/5] sched/deadline: Remove cpu_active_mask from cpudl_find() Xunlei Pang
2015-01-27 15:04 ` Peter Zijlstra
2015-02-04 14:36 ` [tip:sched/core] " tip-bot for Xunlei Pang
2015-01-19 4:49 ` [PATCH 3/5] sched/deadline: Fix wrong cpudl_find() in check_preempt_equal_dl() Xunlei Pang
2015-01-27 12:48 ` Peter Zijlstra
2015-01-27 14:15 ` Peter Zijlstra
2015-01-27 16:47 ` Peter Zijlstra
2015-01-28 15:18 ` Xunlei Pang
2015-01-19 4:49 ` [PATCH 4/5] sched/rt: Consider deadline tasks in cpupri_find() Xunlei Pang
2015-01-27 12:58 ` Peter Zijlstra
2015-01-27 14:18 ` Peter Zijlstra
2015-01-27 23:04 ` Steven Rostedt
2015-01-28 15:21 ` Xunlei Pang
2015-01-19 4:49 ` [PATCH 5/5] sched/rt: Optimize find_lowest_rq() to select a cache hot cpu Xunlei Pang
2015-01-27 14:21 ` Peter Zijlstra
2015-01-27 14:56 ` Steven Rostedt [this message]
2015-01-27 16:28 ` Peter Zijlstra
2015-01-29 16:42 ` Xunlei Pang
2015-01-29 17:17 ` Steven Rostedt
2015-01-29 19:23 ` Peter Zijlstra
2015-02-04 13:07 ` Xunlei Pang
2015-01-23 18:09 ` [PATCH 1/5] sched/deadline: Modify cpudl::free_cpus to reflect rd->online Xunlei Pang
2015-02-01 17:53 ` [tip:sched/core] sched/deadline: Modify cpudl:: free_cpus " tip-bot for Xunlei Pang
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