Re: [PATCH 5/5] sched/rt: Optimize find_lowest_rq() to select a cache hot cpu
From: Steven Rostedt
Date: Thu Jan 29 2015 - 12:17:50 EST
On Fri, 30 Jan 2015 00:42:47 +0800
Xunlei Pang <pang.xunlei@xxxxxxxxxx> wrote:
> I think the responsiveness is the most important feature for RT tasks,
> so I think:
> response latency > cache > SMT in significance.
Unfortunately, sometimes cache affects response latency.
>
> I was wondering if we can take the cpuidle state into account like
> current find_idlest_cpu() for CFS?
> cpupri_find() can be easily modified to indicate the CPUPRI_IDLE case,
> then we can select
> an optimal idle cpu to improve RT tasks' responsiveness. For other
> cases(mostly non-idle cpu),
Even if that idle cpu happens to be on another NUMA node?
-- Steve
> I think we can rely on the existent sched_domain iteraction to select
> a cache-hot cpu without
> caring too much about SMT.
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