linux-kernel - Re: [PATCH] sunrpc/nfs: don't allow TASK_KILLABLE sleeps to block the freezer

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Message-Id: <201112232337.40363.rjw@sisk.pl>
Date:	Fri, 23 Dec 2011 23:37:40 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-pm@...r.kernel.org, tj@...nel.org, john@...va.com,
	trond.myklebust@...app.com, marek.belisko@...il.com,
	awilliam@...hat.com
Subject: Re: [PATCH] sunrpc/nfs: don't allow TASK_KILLABLE sleeps to block the freezer

On Friday, December 23, 2011, Jeff Layton wrote:
> On Thu, 1 Dec 2011 22:52:13 +0100
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > On Thursday, December 01, 2011, Jeff Layton wrote:
> > > Allow the freezer to skip wait_on_bit_killable sleeps in the sunrpc
> > > layer. This should allow suspend and hibernate events to proceed, even
> > > when there are RPC's pending on the wire.
> > > 
> > > Also, wrap the TASK_KILLABLE sleeps in NFS layer in freezer_do_not_count
> > > and freezer_count calls. This allows the freezer to skip tasks that are
> > > sleeping while looping on EJUKEBOX or NFS4ERR_DELAY sorts of errors.
> > > 
> > > Rafael, I've gone ahead and combined the two patches into one here
> > > and rebased this on top of the pm-freezer branch. Let me know if you'd
> > > prefer to keep it as two patches.
> > 
> > One patch is just fine for me, applied to linux-pm/linux-next.
> > 
> > Thanks,
> > Rafael
> > 
> > 
> 
> -------------------[snip]----------------
> 
> > > +
> > > +/* Like schedule_timeout_killable(), but should not block the freezer. */
> > > +#define freezable_schedule_timeout_killable(timeout)			\
> > > +({									\
> > > +	freezer_do_not_count();						\
> > > +	schedule_timeout_killable(timeout);				\
> > > +	freezer_count();						\
> > > +})
> > > +
> 
> 
> Whoops...I just noticed a problem with this patch.
> 
> freezable_schedule_timeout_killable does not return the return code
> from schedule_timeout_killable. Would you prefer for me to respin this
> patch, or send a new patch on top of this one that just fixes that bug?

Please send a new fix patch on top of it.

Thanks,
Rafael
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