linux-kernel - Re: [PATCH 17/18] 2.6.17.9 perfmon2 patch for review: modified x86

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Message-Id: <20060823212701.07d38455.akpm@osdl.org>
Date:	Wed, 23 Aug 2006 21:27:01 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Andi Kleen <ak@...e.de>
Cc:	Stephane Eranian <eranian@...nkl.hpl.hp.com>, eranian@....hp.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/18] 2.6.17.9 perfmon2 patch for review: modified
 x86_64 files

On 23 Aug 2006 12:09:25 +0200
Andi Kleen <ak@...e.de> wrote:

> >  void flush_thread(void)
> > @@ -462,6 +464,8 @@ int copy_thread(int nr, unsigned long cl
> >  	asm("mov %%es,%0" : "=m" (p->thread.es));
> >  	asm("mov %%ds,%0" : "=m" (p->thread.ds));
> >  
> > +	pfm_copy_thread(p);
> > +
> 
> AFAIK there was some work in -mm* for generic notifiers for exit/copy hooks. Can those
> be used?

I dropped them.  It was nice code, but there was overhead.  I went for
nasty&&fast over nice&&slow.
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