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

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Message-Id: <6966a01e-8144-f268-ac9b-3e6fad3a5b2d@linux.vnet.ibm.com>
Date:   Mon, 24 Dec 2018 04:25:37 -0800
From:   Rick Lindsley <ricklind@...ux.vnet.ibm.com>
To:     Steve Sistare <steven.sistare@...cle.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 12/06/2018 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