linux-kernel - Re: [PATCH v2] blk: improve order of bio handling in generic_make

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Message-ID: <58be6551-4aa7-72ee-1616-a1545606d029@kernel.dk>
Date:   Thu, 9 Mar 2017 21:38:05 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     NeilBrown <neilb@...e.com>, Jack Wang <jinpu.wang@...fitbricks.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Pavel Machek <pavel@....cz>, Mike Snitzer <snitzer@...hat.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        linux-raid@...r.kernel.org,
        device-mapper development <dm-devel@...hat.com>,
        linux-block@...r.kernel.org
Subject: Re: [PATCH v2] blk: improve order of bio handling in
 generic_make_request()

On 03/09/2017 09:32 PM, NeilBrown wrote:
> 
> I started looking further at the improvements we can make once
> generic_make_request is fixed, and realised that I had missed an
> important detail in this patch.
> Several places test current->bio_list, and two actually edit the list.
> With this change, that cannot see the whole lists, so it could cause a
> regression.
> 
> So I've revised the patch to make sure that the entire list of queued
> bios remains visible, and change the relevant code to look at both
> the new list and the old list.
> 
> Following that there are some patches which make the rescuer thread
> optional, and then starts removing it from some easy-to-fix places.

Neil, note that the v2 patch is already in Linus tree as of earlier
today. You need to rebase the series, and if we need fixups on
top of v2, then that should be done separately and with increased
urgency.

-- 
Jens Axboe