linux-kernel - Re: [PATCH 1/1] sched: Make schedstats a runtime tunable that is disabled by default v3

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Date:	Tue, 2 Feb 2016 15:02:07 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Mike Galbraith <mgalbraith@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/1] sched: Make schedstats a runtime tunable that is
 disabled by default v3

Dont we need changes for sched_info_on()?

If we disable schedstats dynamically but CONFIG_TASK_DELAY_ACCT is not
set, then sched_info_on will return true, This could impact guest steal
time stats as well as data read from /proc/<PID>/schedstat

Also when schedstats is dynamically disabled, and user tries to enable
kernel sleep profiling profile_setup(), the kernel may not be able to do
the right profiling since enqueue_sleeper() may not get called. Should
we alert the user saying kernel sleep profiling is disabled?

-- 
Thanks and Regards
Srikar Dronamraju