RE: -mm swsusp: do not default to platform/firmware

From: Li, Shaohua (shaohua.li_at_intel.com)
Date: 07/29/04

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    Date:	Thu, 29 Jul 2004 13:19:05 +0800
To: <ncunningham@linuxmail.org>

    Hi,

    >-----Original Message-----
    >From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-
    >owner@vger.kernel.org] On Behalf Of Nigel Cunningham
    >Sent: Thursday, July 29, 2004 8:30 AM
    >To: Pavel Machek
    >Cc: Andrew Morton; Patrick Mochel; akpm@zip.com.au; Linux Kernel
    Mailing
    >List
    >Subject: Re: -mm swsusp: do not default to platform/firmware
    >
    >Hi.
    >
    >On Thu, 2004-07-29 at 09:43, Pavel Machek wrote:
    >> +I did found some kernel threads don't do it, and they don't freeze,
    and
    >
    >"I found... threads that don't..."
    >
    >> +so the system can't sleep. Is this a known behavior?
    >> +
    >> +A: All such kernel threads need to be fixed, one by one. Select
    place
    >> +where it is safe to be frozen (no kernel semaphores should be held
    at
    >> +that point and it must be safe to sleep there), and add:
    >> +
    >> + if (current->flags & PF_FREEZE)
    >> + refrigerator(PF_FREEZE);
    >> +
    >
    >Perhaps you should also add.
    >
    >If the thread is needed for writing the image to storage, you should
    >instead set the PF_NOFREEZE process flag when creating the thread.
    >
    You know for sleep into mem (s3) we also use
    'freeze_processes/refrigerator', and the threads don't write image to
    storage for S3. Should the threads be set the PF_NOFREEZE? Is there any
    side effect for S3 if the threads are running?

    Thanks,
    Shaohua

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