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

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Message-ID: <20160201092943.GN6357@twins.programming.kicks-ass.net>
Date:	Mon, 1 Feb 2016 10:29:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	riel@...hat.com
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 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.