mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Tejun Heo <tj@kernel.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Linux-pm mailing list <linux-pm@lists.linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [RFC][PATCH] PM / Runtime: Use alloc_workqueue() for creating PM workqueue
Date: Thu, 16 Sep 2010 10:11:30 +0200	[thread overview]
Message-ID: <4C91D132.6090607@kernel.org> (raw)
In-Reply-To: <201009152156.30749.rjw@sisk.pl>

Hello, Rafael.

On 09/15/2010 09:56 PM, Rafael J. Wysocki wrote:
> I'm not sure about that WQ_RESCUER thing.  Can you please tell me what
> exactly it is for?

It's to guarantee forward progress for workqueues which process work
items which may be used to reclaim memory.  It reserves a rescue
worker thread to be used under memory pressure.  I finished workqueue
documentation a few days ago and sent pull request to Linus.

  http://git.kernel.org/?p=linux/kernel/git/tj/wq.git;a=blob;f=Documentation/workqueue.txt;h=e4498a2872c37a0b3b156ddc7ad7135d030d224d;hb=c54fce6eff197d9c57c97afbf6c9722ce434fc8f

So, for pm_wq, there's no reason to use WQ_RESUER.
alloc_workqueue("pm", WQ_FREEZEABLE, 0) should do it.

Thanks for doing it.

-- 
tejun

  reply	other threads:[~2010-09-16  8:12 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-15 19:56 Rafael J. Wysocki
2010-09-16  8:11 ` Tejun Heo [this message]
2010-09-16 18:24   ` Rafael J. Wysocki
2010-09-17  9:57     ` Tejun Heo

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=4C91D132.6090607@kernel.org \
    --to=tj@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@lists.linux-foundation.org \
    --cc=rjw@sisk.pl \
    --cc=stern@rowland.harvard.edu \
    /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
Powered by JetHome