From: John Levon <levon@movementarian.org>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: HT and idle = poll
Date: Thu, 6 Mar 2003 23:59:04 +0000 [thread overview]
Message-ID: <20030306235904.GA58512@compsoc.man.ac.uk> (raw)
In-Reply-To: <17740000.1046989368@flay>
On Thu, Mar 06, 2003 at 02:22:48PM -0800, Martin J. Bligh wrote:
> BTW, could someone give a brief summary of why idle=poll is needed for
> oprofile, I'd love to add it do the "documentation for dummies" file I
> was writing.
Because events like CPU_CLK_UNHALTED don't tick when the cpu is halted,
so the idle time doesn't show up properly in the kernel profile.
idle=poll doesn't hlt so the profile for poll_idle() reflects the actual
idle percentage.
Something like that anyway.
john
next prev parent reply other threads:[~2003-03-06 23:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-06 5:18 HT and idle = poll Andrew Theurer
2003-03-06 19:30 ` Linus Torvalds
2003-03-06 19:52 ` Davide Libenzi
2003-03-06 20:05 ` Linus Torvalds
2003-03-06 20:52 ` Davide Libenzi
2003-03-06 21:09 ` Alan Cox
2003-03-06 20:08 ` Linus Torvalds
2003-03-06 22:36 ` Eric Northup
2003-03-06 22:22 ` Martin J. Bligh
2003-03-06 23:59 ` John Levon [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-03-06 21:15 Nakajima, Jun
2003-03-06 22:42 ` Alan Cox
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