linux-kernel - Re: 2.6.22 -mm merge plans

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Message-ID: <20070503172546.GA13392@infradead.org>
Date:	Thu, 3 May 2007 18:25:46 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	rusty@...tcorp.com.au, wfg@...c.edu
Subject: Re: 2.6.22 -mm merge plans

On Thu, May 03, 2007 at 01:16:46PM -0400, Mathieu Desnoyers wrote:
> > kprobes does this kind of synchronization internally, so the marker
> > wrapper should probabl aswell.
> > 
> 
> The problem appears on heavily loaded systems. Doing 50
> synchronize_sched() calls in a row can take up to a few seconds on a
> 4-way machine. This is why I prefer to do it in the module to which
> the callbacks belong.

We recently had a discussion on batch unreistration interface for
kprobes.  I'm not very happy with having so different interfaces for
different kind of probe registrations.

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