From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Nigel Cunningham <nigel@suspend2.net>
Cc: linux-kernel@vger.kernel.org, Pavel Machek <pavel@suse.cz>
Subject: Re: [ 00/23] [Suspend2] Freezer Upgrade Patches
Date: Fri, 27 Jan 2006 13:18:01 +0100 [thread overview]
Message-ID: <200601271318.01985.rjw@sisk.pl> (raw)
In-Reply-To: <200601271404.08680.nigel@suspend2.net>
Hi,
On Friday, 27 January 2006 05:04, Nigel Cunningham wrote:
> On Friday 27 January 2006 09:10, Rafael J. Wysocki wrote:
> > On Thursday, 26 January 2006 04:45, Nigel Cunningham wrote:
> > > Hi everyone.
> > >
> > > This set of patches represents the freezer upgrade patches from Suspend2.
> > >
> > > The key features of this changeset are:
> > >
> > > - Use of Christoph Lameter's todo list notifiers, which help with SMP
> > > cleanness.
> > > - Splitting the freezing of kernel and userspace processes. Freezing
> > > currently suffers from a race because userspace processes can be
> > > submitting work for kernel threads, thereby stopping them from
> > > responding to freeze messages in a timely manner. The freezer can
> > > thus give up when it doesn't really need to. (This is not normally
> > > a problem only because load is not usually high).
> >
> > Could you please describe specific situation?
>
> The simplest example would be:
>
> dd if=/dev/hda of=/dev/null
> echo disk > /sys/power/state
Well, I don't think it's a usual kind of workload. :-)
Anyway, could you please give some details? I mean how exactly your patch
helps in this particular case?
Greetings,
Rafael
next prev parent reply other threads:[~2006-01-27 12:16 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-26 3:45 [ 00/23] [Suspend2] Freezer Upgrade Patches Nigel Cunningham
2006-01-26 3:45 ` [ 01/23] [Suspend2] Make workqueues freezeable Nigel Cunningham
2006-01-26 23:17 ` Rafael J. Wysocki
2006-01-27 4:01 ` Nigel Cunningham
2006-01-26 3:45 ` [ 02/23] [Suspend2] Add new include/linux/freezer.h header Nigel Cunningham
2006-01-26 3:45 ` [ 03/23] [Suspend2] Allow a notifier to remove itself from the notifier list Nigel Cunningham
2006-01-26 3:45 ` [ 04/23] [Suspend2] Todo notifier for processes Nigel Cunningham
2006-01-26 3:45 ` [ 05/23] [Suspend2] Make the freezer use todo lists Nigel Cunningham
2006-01-26 3:45 ` [ 06/23] [Suspend2] Disable usermode helper invocations when the freezer is on Nigel Cunningham
2006-01-30 22:05 ` Rafael J. Wysocki
2006-01-31 3:24 ` Nigel Cunningham
2006-01-31 10:58 ` Rafael J. Wysocki
2006-01-31 23:21 ` Nigel Cunningham
2006-02-01 0:33 ` Rafael J. Wysocki
2006-01-26 3:45 ` [ 07/23] [Suspend2] Add which-to-thaw parameter to thaw_processes() calls Nigel Cunningham
2006-01-26 3:45 ` [ 08/23] [Suspend2] New freezer explanation for kernel/power/process.c Nigel Cunningham
2006-01-26 3:45 ` [ 09/23] [Suspend2] Quieten the freezer for normal operation Nigel Cunningham
2006-01-26 3:45 ` [ 10/23] [Suspend2] Add support for freezing filesystem bdevs Nigel Cunningham
2006-01-26 3:45 ` [ 11/23] [Suspend2] Modify freezeable for freezing kernel threads separately Nigel Cunningham
2006-01-26 3:45 ` [ 12/23] [Suspend2] Split freezing of threads according to whether user/kernelspace Nigel Cunningham
2006-01-26 3:45 ` [ 13/23] [Suspend2] Add support for thawing just kernel threads or all threads Nigel Cunningham
2006-01-26 3:45 ` [ 14/23] [Suspend2] Helper for counting freezeable threads of a type Nigel Cunningham
2006-01-26 3:45 ` [ 15/23] [Suspend2] Helper for counting uninterruptible " Nigel Cunningham
2006-01-30 22:18 ` Rafael J. Wysocki
2006-01-30 22:25 ` Pavel Machek
2006-01-31 0:02 ` Rafael J. Wysocki
2006-01-31 9:27 ` [RFC/RFT] finally solve "swsusp fails with mysqld" problem Pavel Machek
2006-01-31 16:17 ` Rafael J. Wysocki
2006-01-31 21:29 ` Pavel Machek
2006-01-31 22:30 ` Rafael J. Wysocki
2006-01-31 5:42 ` [ 15/23] [Suspend2] Helper for counting uninterruptible threads of a type Nigel Cunningham
2006-01-26 3:45 ` [ 16/23] [Suspend2] Helper to signal all " Nigel Cunningham
2006-01-26 3:46 ` [ 17/23] [Suspend2] Helper to prod processes that should have frozen but haven't Nigel Cunningham
2006-01-26 3:46 ` [ 18/23] [Suspend2] Helper: Did we fail to freeze all threads of a type? Nigel Cunningham
2006-01-26 3:46 ` [ 19/23] [Suspend2] Freeze all threads of a type Nigel Cunningham
2006-01-26 3:46 ` [ 20/23] [Suspend2] Modify process.c includes and export freezer state Nigel Cunningham
2006-01-26 3:46 ` [ 21/23] [Suspend2] Remove unused DEBUG undef Nigel Cunningham
2006-01-26 3:46 ` [ 22/23] [Suspend2] Modify swsusp to thaw kernel threads while eating memory Nigel Cunningham
2006-01-26 3:46 ` [ 23/23] [Suspend2] Don't scan LRU while freezer is on Nigel Cunningham
2006-01-26 11:55 ` [ 00/23] [Suspend2] Freezer Upgrade Patches Pavel Machek
2006-01-26 21:49 ` Nigel Cunningham
2006-01-26 23:10 ` Rafael J. Wysocki
2006-01-27 4:04 ` Nigel Cunningham
2006-01-27 12:18 ` Rafael J. Wysocki [this message]
2006-01-27 19:20 ` Nigel Cunningham
2006-01-27 23:22 ` Pavel Machek
2006-01-30 5:54 ` Nigel Cunningham
2006-01-30 11:50 ` Pavel Machek
2006-01-30 7:53 ` Stefan Seyfried
2006-01-30 11:53 ` Rafael J. Wysocki
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