From: davidsen@tmr.com (bill davidsen)
To: linux-kernel@vger.kernel.org
Subject: Re: [Lse-tech] [patch 2.6.0-test1] per cpu times
Date: 23 Jul 2003 21:50:42 GMT [thread overview]
Message-ID: <bfmvvi$lba$1@gatekeeper.tmr.com> (raw)
In-Reply-To: 20030718111850.C1627@w-mikek2.beaverton.ibm.com
In article <20030718111850.C1627@w-mikek2.beaverton.ibm.com>,
Mike Kravetz <kravetz@us.ibm.com> wrote:
| On a somewhat related note ...
|
| We (Big Blue) have a performance reporting application that
| would like to know how long a task sits on a runqueue before
| it is actually given the CPU. In other words, it wants to
| know how long the 'runnable task' was delayed due to contention
| for the CPU(s). Of course, one could get an overall feel for
| this based on total runqueue length. However, this app would
| really like this info on a per-task basis.
This is certainly a useful number. It's easy to tell when the CPU is "in
use," but it's not easy to tell when it's "busy" and processes are
waiting for a CPU.
--
bill davidsen <davidsen@tmr.com>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
next prev parent reply other threads:[~2003-07-23 21:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-18 16:35 [patch 2.6.0-test1] per cpu times Erich Focht
2003-07-18 18:18 ` [Lse-tech] " Mike Kravetz
2003-07-18 19:57 ` William Lee Irwin III
2003-07-18 20:53 ` Rick Lindsley
2003-07-21 4:47 ` Peter Chubb
2003-07-23 21:50 ` bill davidsen [this message]
2003-07-23 23:32 ` Peter Chubb
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