From: Andrew Morton <akpm@digeo.com>
To: Erich Focht <efocht@ess.nec.de>
Cc: William Lee Irwin III <wli@holomorphy.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Michael Hohnbaum <hohnbaum@us.ibm.com>,
LSE <lse-tech@lists.sourceforge.net>
Subject: Re: per cpu time statistics
Date: Wed, 04 Dec 2002 09:47:26 -0800 [thread overview]
Message-ID: <3DEE3FAE.558649F5@digeo.com> (raw)
In-Reply-To: 200212041343.39734.efocht@ess.nec.de
Erich Focht wrote:
>
> Andrew, Bill,
>
> I had to learn from Michael Hohnbaum that you've eliminated the per
> CPU time statistics in 2.5.50 (akpm changeset from Nov. 26). Reading
> the cset comments I understood that the motivation was to save
> 8*NR_CPUS bytes of memory in the task_struct. Maybe that was really an
> issue at the time when Bill suggested the patch (July), but in the
> mean time we got configurable NR_CPUS (October) and that small amount
> of additional memory really doesn't matter. Most people running SMP
> have 2 CPUs.
It's mainly the big ia32 boxes which a) have a lot of CPUs and
b) have a lot of memory and c) run a lot of tasks. They're
gasping for normal-zone memory.
I'm half-inclined to just revert the whole thing and put the stats
back, rather than adding yet another obscure config option. But
your patch is certainly very tidy...
next prev parent reply other threads:[~2002-12-04 17:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-04 12:43 per cpu time statistics Erich Focht
2002-12-04 17:47 ` Andrew Morton [this message]
2002-12-04 18:30 ` William Lee Irwin III
2002-12-05 10:57 ` Erich Focht
2002-12-05 11:14 ` William Lee Irwin III
2002-12-05 17:01 ` Bill Davidsen
2002-12-06 17:31 ` Michael Hohnbaum
2002-12-06 17:55 ` [Lse-tech] " William Lee Irwin III
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