linux-kernel - Re: [patch V3] percpu_counter: scalability works

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Message-ID: <alpine.DEB.2.00.1105170936440.11187@router.home>
Date:	Tue, 17 May 2011 09:38:02 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Tejun Heo <tj@...nel.org>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Shaohua Li <shaohua.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"npiggin@...nel.dk" <npiggin@...nel.dk>
Subject: Re: [patch V3] percpu_counter: scalability works

On Tue, 17 May 2011, Tejun Heo wrote:

> We can implement force-flush for dire situations, similar to expedited
> RCU flush thing.

I would suggest that if the user wants accurate results then another
external form of synchronization needs to be provided. Maybe the counter
is always incremented when another lock has been taken.

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