From: William Lee Irwin III <wli@holomorphy.com>
To: Erich Focht <efocht@ess.nec.de>
Cc: Andrew Morton <akpm@digeo.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: Thu, 5 Dec 2002 03:14:43 -0800 [thread overview]
Message-ID: <20021205111443.GA18600@holomorphy.com> (raw)
In-Reply-To: <200212051157.29775.efocht@ess.nec.de>
On Thu, Dec 05, 2002 at 11:57:29AM +0100, Erich Focht wrote:
> My patch is basically the reverting patch plus changed ifdefs and a
> bunch of Kconfig entries. I'd be happy to get this feature back, no
> matter how it is implemented. I think it is necessary for performance
> analysis on HT, NUMA, SMT systems.
32-bit is not irrelevant, but there's certainly a 64-bit land where
the critical 32-bit correctness issue becomes a minor 64-bit
performance issue. This is the nature of extended 32-bit addressing.
By and large what is a severe and world-breaking correctness issue for
32-bit with extended addressing is a performance issue for the rest.
And so I feel we are all in harmony; the scheduler statistics are in
fact valuable on all platforms, it's just an question of basic "should
this overhead be required or optional?"
Bill
next prev parent reply other threads:[~2002-12-05 11:07 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
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 [this message]
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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