LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: David Chow <davidchow@shaolinmicro.com>
To: Robert Love <rml@tech9.net>
Cc: William Lee Irwin III <wli@holomorphy.com>, linux-kernel@vger.kernel.org
Subject: Re: CPU load
Date: Sat, 27 Jul 2002 01:38:51 +0800	[thread overview]
Message-ID: <3D41892B.8020908@shaolinmicro.com> (raw)
In-Reply-To: <1026323370.1352.70.camel@sinai>

Robert Love wrote:

>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
>  
>

Thanks for your information. I think having a generic interface to 
deterining CPU load of the system can help developers to determine some 
task schdeuling policy to make the system more efficient utilise the 
systems processing power. For example, I would not want to do some 
intensive processing job when CPU load is high, but I can leaving this 
work util the CPU load is not high (for non-urgent tasks).

regards,
David

regards,
David


  reply	other threads:[~2002-07-26 17:35 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
2002-07-26 17:38     ` David Chow [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=3D41892B.8020908@shaolinmicro.com \
    --to=davidchow@shaolinmicro.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=rml@tech9.net \
    --cc=wli@holomorphy.com \
    --subject='Re: CPU load' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).