linux-kernel - Re: [PATCHSET v2] blk-mq: reimplement timeout handling

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Message-ID: <20171221000805.GC1084507@devbig577.frc2.facebook.com>
Date:   Wed, 20 Dec 2017 16:08:05 -0800
From:   "tj@...nel.org" <tj@...nel.org>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "kernel-team@...com" <kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "osandov@...com" <osandov@...com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "oleg@...hat.com" <oleg@...hat.com>, "hch@....de" <hch@....de>
Subject: Re: [PATCHSET v2] blk-mq: reimplement timeout handling

On Wed, Dec 20, 2017 at 11:41:02PM +0000, Bart Van Assche wrote:
> On Tue, 2017-12-12 at 11:01 -0800, Tejun Heo wrote:
> > Currently, blk-mq timeout path synchronizes against the usual
> > issue/completion path using a complex scheme involving atomic
> > bitflags, REQ_ATOM_*, memory barriers and subtle memory coherence
> > rules.  Unfortunatley, it contains quite a few holes.
> 
> Hello Tejun,
> 
> An attempt to run SCSI I/O with this patch series applied resulted in
> the following:

Can you please try the v3?  There were a couple bugs that I missed
while testing earlier versions.

 http://lkml.kernel.org/r/20171216120726.517153-1-tj@kernel.org

Thanks.

-- 
tejun