All of lore.kernel.org
 help / color / mirror / Atom feed
From: Tejun Heo <tj@kernel.org>
To: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
	Christoph Lameter <cl@linux.com>, NeilBrown <neilb@suse.com>
Subject: Re: [PATCH 1/5] percpu-refcount: Introduce percpu_ref_switch_to_atomic_nowait()
Date: Mon, 11 Sep 2017 06:13:31 -0700	[thread overview]
Message-ID: <20170911131331.GE1774378@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <20170908235226.26622-2-bart.vanassche@wdc.com>

On Fri, Sep 08, 2017 at 04:52:22PM -0700, Bart Van Assche wrote:
> The blk-mq core keeps track of the number of request queue users
> through q->q_usage_count. Make it possible to switch this counter
> to atomic mode from the context of the block layer power management
> code by introducing percpu_ref_switch_to_atomic_nowait().

Do you ever have to switch back?  If so, how do you know whether the
previous transition finished?

Thanks.

-- 
tejun

  parent reply	other threads:[~2017-09-11 13:13 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-08 23:52 [PATCH 0/5] Make SCSI device suspend work reliably Bart Van Assche
2017-09-08 23:52 ` [PATCH 1/5] percpu-refcount: Introduce percpu_ref_switch_to_atomic_nowait() Bart Van Assche
2017-09-11  8:42   ` Johannes Thumshirn
2017-09-11 16:10     ` Bart Van Assche
2017-09-11 13:13   ` Tejun Heo [this message]
2017-09-11 16:09     ` Bart Van Assche
2017-09-11 16:37       ` tj
2017-09-11 16:55         ` Bart Van Assche
2017-09-11 17:20           ` Tejun Heo
2017-09-11 17:29             ` Bart Van Assche
2017-09-08 23:52 ` [PATCH 2/5] scsi: Change the type of the second last argument of scsi_execute() Bart Van Assche
2017-09-08 23:52 ` [PATCH 3/5] block: Introduce REQ_PM and remove RQF_PM Bart Van Assche
2017-09-08 23:52 ` [PATCH 4/5] block: Make SCSI device suspend work reliably Bart Van Assche
2017-09-12  2:29   ` Ming Lei
2017-09-12 15:45     ` Bart Van Assche
2017-09-12 16:10       ` Ming Lei
2017-09-12 16:25   ` Ming Lei
2017-09-08 23:52 ` [PATCH 5/5] blk-mq: Implement power management support Bart Van Assche
2017-09-12  9:14   ` Ming Lei
2017-09-09 10:39 ` [PATCH 0/5] Make SCSI device suspend work reliably Ming Lei
2017-09-11 16:25   ` Bart Van Assche
2017-09-12  2:17     ` Ming Lei

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=20170911131331.GE1774378@devbig577.frc2.facebook.com \
    --to=tj@kernel.org \
    --cc=axboe@kernel.dk \
    --cc=bart.vanassche@wdc.com \
    --cc=cl@linux.com \
    --cc=hch@lst.de \
    --cc=linux-block@vger.kernel.org \
    --cc=neilb@suse.com \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.