linux-kernel - Re: [PATCH-v2 1/3] percpu_ida: Make percpu_ida_alloc + callers accept task state bitmask

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Message-ID: <1390505486.5567.1014.camel@haakon3.risingtidesystems.com>
Date:	Thu, 23 Jan 2014 11:31:26 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	kmo@...erainc.com, target-devel <target-devel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH-v2 1/3] percpu_ida: Make percpu_ida_alloc + callers
 accept task state bitmask

On Thu, 2014-01-23 at 20:12 +0100, Peter Zijlstra wrote:
> On Thu, Jan 23, 2014 at 10:40:04AM -0800, Nicholas A. Bellinger wrote:
> > On Wed, 2014-01-22 at 11:53 -0800, Nicholas A. Bellinger wrote:
> > > Hi Peter,
> > > 
> > > Does this satisfy your questions..?
> > > 
> > > Do you have any more concerns about TASK_RUNNING + prepare_to_wait()
> > > usage in percpu_ida_alloc() that need to be addressed before I can drop
> > > this series into target-pending/for-next to address the original bug..?
> > > 
> > 
> > Given the silence, 
> 
> You mean the silence in which I send a 4+ emails earlier today?
> 
> > I'll assume your OK with the initial TASK_RUNNING +
> > prepare_to_wait() bit, right..?
> 
> No, I would prefer not to do that. While it does work its awkward at
> best.

AFAICT, those changes don't address the original bug that the series was
trying to address, allowing the percpu_ida_alloc() tag stealing slow
path to be interrupted by a signal..

Also, keep in mind this change needs to be backported to >= v3.12, which
is why the percpu_ida changes have been kept to a minimum.

--nab



  

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