From: Ingo Molnar <mingo@elte.hu>
To: Jack Steiner <steiner@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] - Fix potential race condition in wake_up_forked_process()
Date: Thu, 9 Sep 2004 21:56:42 +0200 [thread overview]
Message-ID: <20040909195642.GA3435@elte.hu> (raw)
In-Reply-To: <20040909194558.GA28653@sgi.com>
* Jack Steiner <steiner@sgi.com> wrote:
> There appears to be a tiny (microscopic) timing hole in
> wake_up_forked_process(). It is possible that a load_balancing
> application could change cpus_allowed on a task as it is being forked.
> Unlikely, but it can happen, especially if preemption is enabled.
there has been alot of work in this area and sched.c in -BK is much
different from 2.6.8.1's sched.c. In particular there's no
wake_up_forked_process() but wake_up_new_task().
more importantly, the whole bootstrapping of a new task has been
reworked and the set_cpus_allowed() race should not exist in -BK
anymore. Could you double-check to make sure?
Ingo
prev parent reply other threads:[~2004-09-09 20:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-09 19:45 [PATCH] - Fix potential race condition in wake_up_forked_process() Jack Steiner
2004-09-09 19:56 ` Ingo Molnar [this message]
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=20040909195642.GA3435@elte.hu \
--to=mingo@elte.hu \
--cc=linux-kernel@vger.kernel.org \
--cc=steiner@sgi.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.