linux-kernel - Re: [PATCH] revert: timers: fix itimer/many thread hang

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Message-ID: <Pine.LNX.4.64.0811061552590.14566@quilx.com>
Date:	Thu, 6 Nov 2008 15:53:57 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Frank Mayhar <fmayhar@...gle.com>,
	Doug Chapman <doug.chapman@...com>, roland@...hat.com,
	adobriyan@...il.com, akpm@...ux-foundation.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] revert: timers: fix itimer/many thread hang

On Thu, 6 Nov 2008, Ingo Molnar wrote:

> That loop could _perhaps_ be avoided by maintaining the sums from the
> scheduler tick: by just adding the latest delta values for the current
> task to times->*time. Plus at exit time cleaning up the remaining
> delta. That would be a far smaller patch.

That is a similar scheme to the ZVC (see mm/vmstat.c). Peter: Dont you
have an implementation of a ZVC like scheme for you dirty throttling
patchset that may be useful here?

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