linux-block.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH RFC 1/2] fs/iomap/direct-io: pass NOWAIT to bio flags
Date: Mon, 4 May 2020 19:23:50 +0300	[thread overview]
Message-ID: <94ec1b65-5f4c-6b56-5a47-ca186615d978@yandex-team.ru> (raw)
In-Reply-To: <20200504160052.GA8625@infradead.org>

On 04/05/2020 19.00, Christoph Hellwig wrote:
> On Mon, May 04, 2020 at 06:54:53PM +0300, Konstantin Khlebnikov wrote:
>> This is required to avoid waiting in lower layers.
>>
>> Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
> 
> This looks sensible.  Did you run this through xfstests?
> 

Nope. It seems xfstests has one trivial test for NOWAIT - generic/471
It tests only write with/without extent, nothing about contention.

I've added nowait into fio and played with it a little.
https://github.com/axboe/fio/pull/972

With these patches I see EAGAINs when queue is flooded.

  reply	other threads:[~2020-05-04 16:23 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-04 15:54 [PATCH RFC 1/2] fs/iomap/direct-io: pass NOWAIT to bio flags Konstantin Khlebnikov
2020-05-04 15:54 ` [PATCH RFC 2/2] fs/direct-io: pass NOWAIT to also for read requests Konstantin Khlebnikov
2020-05-06 14:40   ` Christoph Hellwig
2020-05-04 16:00 ` [PATCH RFC 1/2] fs/iomap/direct-io: pass NOWAIT to bio flags Christoph Hellwig
2020-05-04 16:23   ` Konstantin Khlebnikov [this message]
2020-05-06 14:40     ` Christoph Hellwig
2020-05-06 14:40 ` Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=94ec1b65-5f4c-6b56-5a47-ca186615d978@yandex-team.ru \
    --to=khlebnikov@yandex-team.ru \
    --cc=axboe@kernel.dk \
    --cc=hch@infradead.org \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).