linux-kernel - Re: [PATCH 4/4] sched,time: only call account_{user,sys,guest,idle}

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Message-ID: <56AFB0BB.8060301@redhat.com>
Date:	Mon, 1 Feb 2016 14:23:39 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...nel.org, luto@...capital.net,
	clark@...hat.com
Subject: Re: [PATCH 4/4] sched,time: only call
 account_{user,sys,guest,idle}_time once a jiffy

On 02/01/2016 04:29 AM, Peter Zijlstra wrote:
> On Sun, Jan 31, 2016 at 09:12:31PM -0500, riel@...hat.com wrote:
>> Run times for the microbenchmark:
>>
>> 4.4				3.8 seconds
>> 4.5-rc1				3.7 seconds
>> 4.5-rc1 + first patch		3.3 seconds
>> 4.5-rc1 + first 3 patches	3.1 seconds
>> 4.5-rc1 + all patches		2.3 seconds
> 
> Would be good to compare that also to a !NOHZ_FULL bloated path.

On a non-nohz_full, non-housekeeping CPU, I see 1.86
seconds run time, or about 20% faster than on a nohz_full
CPU with all patches applied.

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