From: Pavel Machek <pavel@ucw.cz>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>,
Andres Salomon <dilinger@debian.org>,
linux-pm@lists.linux-foundation.org, Chris Ball <cjb@laptop.org>,
David Woodhouse <dwmw2@infradead.org>,
Oleg Nesterov <oleg@tv-sign.ru>
Subject: Re: [RFC][PATCH -mm 1/3] Freezer: Use wait queue instead of busy looping
Date: Wed, 1 Aug 2007 09:59:40 +0200 [thread overview]
Message-ID: <20070801075940.GS2087@elf.ucw.cz> (raw)
In-Reply-To: <200708010026.56427.rjw@sisk.pl>
Hi!
> Use the observation that try_to_freeze_tasks() need not loop while waiting for
> the freezing tasks to enter the refrigerator and make it use a wait queue.
>
> The idea is that after sending freeze requests to the tasks regarded as
> freezable try_to_freeze_tasks() can go to sleep and wait until at least one task
> enters the refrigerator. The first task that does it wakes up
> try_to_freeze_tasks() and the procedure is repeated. If the refrigerator is not
> entered by any tasks before TIMEOUT expires, the freezing of tasks fails.
>
> This way, try_to_freeze_tasks() doesn't occupy the CPU unnecessarily when some
> freezing tasks are waiting for I/O to complete.
Ok, I guess this is as simple as it gets. ACK.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2007-08-01 7:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-25 12:01 [RFC][PATCH -mm 0/2] Freezer: Use wait queue instead of busy looping Rafael J. Wysocki
2007-07-25 12:03 ` [RFC][PATCH -mm 1/2] Freezer: Be more verbose Rafael J. Wysocki
2007-07-25 12:27 ` Pavel Machek
2007-07-25 12:09 ` [RFC][PATCH -mm 2/2] Freezer: Use wait queue instead of busy looping Rafael J. Wysocki
2007-07-25 12:28 ` Pavel Machek
2007-07-25 12:55 ` Rafael J. Wysocki
2007-07-25 13:29 ` Oleg Nesterov
2007-07-25 14:03 ` Rafael J. Wysocki
2007-07-25 14:24 ` Oleg Nesterov
2007-07-26 12:24 ` Rafael J. Wysocki
2007-07-26 12:43 ` Rafael J. Wysocki
2007-07-31 8:01 ` Pavel Machek
2007-07-31 9:39 ` Rafael J. Wysocki
2007-07-31 10:00 ` Pavel Machek
2007-07-31 10:17 ` Rafael J. Wysocki
2007-07-31 10:08 ` Rafael J. Wysocki
2007-07-31 10:02 ` Pavel Machek
2007-07-31 22:25 ` [RFC][PATCH -mm 0/3] Freezer: Use wait queue instead of busy looping (updated) Rafael J. Wysocki
2007-07-31 22:26 ` [RFC][PATCH -mm 1/3] Freezer: Use wait queue instead of busy looping Rafael J. Wysocki
2007-08-01 7:59 ` Pavel Machek [this message]
2007-07-31 22:28 ` [RFC][PATCH -mm 2/3] Freezer: Measure the time of freezing tasks Rafael J. Wysocki
2007-08-01 8:28 ` Pavel Machek
2007-07-31 22:29 ` [RFC][PATCH -mm 3/3] Freezer: Replace the timeout Rafael J. Wysocki
2007-08-01 8:31 ` Pavel Machek
2007-08-01 10:43 ` Rafael J. Wysocki
2007-08-05 21:37 ` Pavel Machek
2007-08-05 22:38 ` Rafael J. Wysocki
2007-08-05 22:53 ` Pavel Machek
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=20070801075940.GS2087@elf.ucw.cz \
--to=pavel@ucw.cz \
--cc=cjb@laptop.org \
--cc=dilinger@debian.org \
--cc=dwmw2@infradead.org \
--cc=linux-pm@lists.linux-foundation.org \
--cc=nigel@nigel.suspend2.net \
--cc=oleg@tv-sign.ru \
--cc=rjw@sisk.pl \
/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.