From: Con Kolivas <kernel@kolivas.org>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: bug in sched.c:activate_task()
Date: Tue, 05 Oct 2004 12:34:30 +1000 [thread overview]
Message-ID: <cone.1096943670.717018.10082.502@pc.kolivas.org> (raw)
In-Reply-To: <200410050216.i952Gb620657@unix-os.sc.intel.com>
Chen, Kenneth W writes:
> Update p->timestamp to "now" in activate_task() doesn't look right
> to me at all. p->timestamp records last time it was running on a
> cpu. activate_task shouldn't update that variable when it queues
> a task on the runqueue.
>
> This bug (and combined with others) triggers improper load balancing.
The updated timestamp was placed there by Ingo to detect on-runqueue time.
If it is being used for load balancing then it is being used in error.
Con
next prev parent reply other threads:[~2004-10-05 2:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-05 2:16 Chen, Kenneth W
2004-10-05 2:34 ` Con Kolivas [this message]
2004-10-05 3:14 ` Nick Piggin
2004-10-05 4:45 ` Con Kolivas
2004-10-05 5:05 ` Peter Williams
2004-10-05 6:10 ` Nick Piggin
2004-10-05 6:31 ` Ingo Molnar
2004-10-05 6:36 ` Con Kolivas
2004-10-05 6:54 ` Ingo Molnar
2004-10-05 6:59 ` Con Kolivas
2004-10-05 7:08 ` Nick Piggin
2004-10-05 7:09 ` Ingo Molnar
2004-10-05 17:30 ` Chen, Kenneth W
2004-10-05 17:25 ` Chen, Kenneth W
2004-10-05 6:57 ` Nick Piggin
2004-10-05 8:19 ` Ingo Molnar
2004-10-05 17:44 ` Chen, Kenneth W
2004-10-05 22:46 Chen, Kenneth W
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=cone.1096943670.717018.10082.502@pc.kolivas.org \
--to=kernel@kolivas.org \
--cc=kenneth.w.chen@intel.com \
--cc=linux-kernel@vger.kernel.org \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®