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From: Robert Love <rml@tech9.net>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: David Chow <davidchow@shaolinmicro.com>, linux-kernel@vger.kernel.org
Subject: Re: CPU load
Date: 10 Jul 2002 10:49:29 -0700	[thread overview]
Message-ID: <1026323370.1352.70.camel@sinai> (raw)
In-Reply-To: <20020710165443.GA15916@holomorphy.com>

On Wed, 2002-07-10 at 09:54, William Lee Irwin III wrote:

> Examine the avenrun array declared in kernel/timer.c in a manner similar
> to how loadavg_read_proc() in fs/proc/proc_misc.c does.

David, I wanted to add that we formalized the locking rules on
avenrun[3] a couple kernel revisions ago.

In 2.4, I believe it is implicitly assumed you will do a cli() before
accessing the data (if you want all 3 values to be in sync you need the
read to be safe).

In 2.5, grab a read_lock on xtime_lock and go at it.

	Robert Love


  reply	other threads:[~2002-07-10 17:46 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-07-10 14:50 David Chow
2002-07-10 16:54 ` William Lee Irwin III
2002-07-10 17:49   ` Robert Love [this message]
2002-07-26 17:38     ` David Chow
2007-02-12  5:33 Vassili Karpov
2007-02-12  5:44 ` Con Kolivas
2007-02-12  5:54   ` malc
2007-02-12  6:12     ` Con Kolivas
2007-02-12  7:10       ` malc
2007-02-12  7:29         ` Con Kolivas
2007-02-12  5:55   ` Stephen Rothwell
2007-02-12  6:08     ` Con Kolivas
2007-02-12 14:32   ` Pavel Machek
2007-02-13 22:01     ` malc
2007-02-13 22:08       ` Con Kolivas
2007-02-14  7:28         ` malc
2007-02-14  8:09           ` Con Kolivas
2007-02-14 20:45           ` Pavel Machek
2007-02-25 10:35             ` malc
2007-02-26  9:28               ` Pavel Machek
2007-02-26 10:42                 ` malc
2007-02-26 16:38                   ` Randy Dunlap
2007-02-12 18:05   ` malc
2007-02-12 16:57 Andrew Burgess
2007-02-12 18:15 ` malc

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