linux-kernel - Re: [PATCH v4 10/10] sched/fair: Provide idle search schedstats

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Date:   Mon, 14 Jan 2019 12:04:19 -0500
From:   Steven Sistare <steven.sistare@...cle.com>
To:     Rick Lindsley <ricklind@...ux.vnet.ibm.com>, mingo@...hat.com,
        peterz@...radead.org
Cc:     subhra.mazumdar@...cle.com, dhaval.giani@...cle.com,
        daniel.m.jordan@...cle.com, pavel.tatashin@...rosoft.com,
        matt@...eblueprint.co.uk, umgwanakikbuti@...il.com,
        riel@...hat.com, jbacik@...com, juri.lelli@...hat.com,
        valentin.schneider@....com, vincent.guittot@...aro.org,
        quentin.perret@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 10/10] sched/fair: Provide idle search schedstats

On 12/24/2018 7:25 AM, Rick Lindsley wrote:
> On 12/06/2018 01:28 PM, Steve Sistare wrote:
>> Add schedstats to measure the effectiveness of searching for idle CPUs
>> and stealing tasks.  This is a temporary patch intended for use during
>> development only.  SCHEDSTAT_VERSION is bumped to 16, and the following
>> fields are added to the per-CPU statistics of /proc/schedstat:
> 
> Why only temporary?  It would seem that this might be useful information in the future too, for other developers with either new code or new use cases.
> 
> Rick

Yes, they could be useful.  I suspect it would take a while to reach consensus
on new field definition, and whether their usefulness outweighs the downside
of breaking out of tree tools that assume version 15.

- Steve