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From: Andrew Morton <akpm@digeo.com>
To: Roberto Nibali <ratz@drugphish.ch>
Cc: linux-kernel@vger.kernel.org
Subject: Re: TLB flush counters gone in 2.5.35-bk?
Date: Tue, 17 Sep 2002 13:55:49 -0700	[thread overview]
Message-ID: <3D8796D5.A4ACD5FA@digeo.com> (raw)
In-Reply-To: 3D874DA1.20803@drugphish.ch

Roberto Nibali wrote:
> 
> Hello,
> 
> I was just browsing over the latest bk tree when I saw the following change:
> 
> ...
> -       unsigned long           flushes;/* stats: count avoided flushes */
> -       unsigned long           avoided_flushes;

That was some statistical/debug code to evaluate how useful
that particular optimisation was being.  Answer: it saves
30-35% of the global TLB invalidations coming out of there.

But it had served its purpose.

  reply	other threads:[~2002-09-17 20:50 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-17 15:43 TLB flush counters gone in 2.5.35-bk? Roberto Nibali
2002-09-17 20:55 ` Andrew Morton [this message]
     [not found] <3D874DA1.20803@drugphish.ch.suse.lists.linux.kernel>
2002-09-17 16:59 ` Andi Kleen
2002-09-17 18:45   ` Roberto Nibali

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