From: Jeff Moyer <jmoyer@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: BLK_MQ_F_DEFER_ISSUE
Date: Mon, 20 Apr 2015 12:04:14 -0400 [thread overview]
Message-ID: <x49pp6y7pmp.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <55352238.1020301@kernel.dk> (Jens Axboe's message of "Mon, 20 Apr 2015 09:58:48 -0600")
Jens Axboe <axboe@kernel.dk> writes:
> On 04/20/2015 09:09 AM, Jeff Moyer wrote:
>> Hi, Jens,
>>
>> This flag was introduced under the auspices that the nvme blk-mq
>> conversion would make use of it. That never materialized. Are there
>> still plans to make use of it? If not, I'd like to get rid of it. If
>> so, then let's document it better.
>
> Yep I still want to use it, and I do have a patch that uses it as well
> that I've run through testing. I thought I had pushed it somewhere,
> but it doesn't seem like I have. I just wanted to get the lower
> hanging optimizations out there first, like the kmalloc/kfree and
> queue-lock-for-completions removal. Former is in, latter is not yet.
>
> It's a useful optimization for lots of cases and I'm sure it'll see
> other uses, once the nvme patch is in. That will give people a
> reference point.
OK, thanks for the quick reply.
-Jeff
prev parent reply other threads:[~2015-04-20 16:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-20 15:09 BLK_MQ_F_DEFER_ISSUE Jeff Moyer
2015-04-20 15:58 ` BLK_MQ_F_DEFER_ISSUE Jens Axboe
2015-04-20 16:04 ` Jeff Moyer [this message]
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