linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Ming Lei <tom.leiming@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: Nigel Cunningham <nigel@nigelcunningham.com.au>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	Jens Axboe <axboe@kernel.dk>,
	tomaz.solc@tablix.org, aaron.lu@intel.com,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Oleg Nesterov <oleg@redhat.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Fengguang Wu <fengguang.wu@intel.com>
Subject: Re: [PATCH] libata, freezer: avoid block device removal while system is frozen
Date: Mon, 16 Dec 2013 21:24:40 +0800	[thread overview]
Message-ID: <CACVXFVMPQUjAmvNpO+WVLDzVBwkwPtqqyBga_uXxfptVpEPPbw@mail.gmail.com> (raw)
In-Reply-To: <20131216124504.GB32509@htj.dyndns.org>

On Mon, Dec 16, 2013 at 8:45 PM, Tejun Heo <tj@kernel.org> wrote:
> Hello,
>
> On Mon, Dec 16, 2013 at 08:12:07PM +0800, Ming Lei wrote:
>> Looks we should guarantee that I/O queue is emptied before system sleep,
>> otherwise it may be a bug, since battery may be drained up to cause
>> data loss or block devices may be disconnected during sleep.
>
> It's a bit beside the point as that's what journaling is for.  Power
> loss during suspend isn't all that different from power loss while
> suspended.  Also, the filesystems are already synced before entering
> suspend, so it shouldn't be an issue.  However, that doesn't guarantee
> there aren't no pending bdi work items.  We *hope* to control the

You mean there are still some write I/O scheduled after processes are
frozen? by unfreezable kernel threads?

> sources with freezer but there's no guarantee about the coverage and
> no way to verify that either.

Thanks,
-- 
Ming Lei

  reply	other threads:[~2013-12-16 13:24 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-13 17:49 Writeback threads and freezable Tejun Heo
2013-12-13 18:52 ` Tejun Heo
2013-12-13 20:40   ` [PATCH] libata, freezer: avoid block device removal while system is frozen Tejun Heo
2013-12-13 22:45     ` Nigel Cunningham
2013-12-13 23:07       ` Tejun Heo
2013-12-13 23:15         ` Nigel Cunningham
2013-12-14  1:55           ` Dave Chinner
2013-12-14 20:31           ` Tejun Heo
2013-12-14 20:36             ` Tejun Heo
2013-12-14 21:21               ` Nigel Cunningham
2013-12-17  2:35                 ` Rafael J. Wysocki
2013-12-17  2:34             ` Rafael J. Wysocki
2013-12-17 12:34               ` Tejun Heo
2013-12-18  0:35                 ` Rafael J. Wysocki
2013-12-18 11:17                   ` Tejun Heo
2013-12-18 21:48                     ` Rafael J. Wysocki
2013-12-18 21:39                       ` Tejun Heo
2013-12-18 21:41                         ` Tejun Heo
2013-12-18 22:04                           ` Rafael J. Wysocki
2013-12-19 23:35                             ` [PATCH wq/for-3.14 1/2] workqueue: update max_active clamping rules Tejun Heo
2013-12-20  1:26                               ` Rafael J. Wysocki
2013-12-19 23:37                             ` [PATCH wq/for-3.14 2/2] workqueue: implement @drain for workqueue_set_max_active() Tejun Heo
2013-12-20  1:31                               ` Rafael J. Wysocki
2013-12-20 13:32                                 ` Tejun Heo
2013-12-20 13:56                                   ` Rafael J. Wysocki
2013-12-20 14:23                                     ` Tejun Heo
2013-12-16 12:12         ` [PATCH] libata, freezer: avoid block device removal while system is frozen Ming Lei
2013-12-16 12:45           ` Tejun Heo
2013-12-16 13:24             ` Ming Lei [this message]
2013-12-16 16:05               ` Tejun Heo
2013-12-17  2:38     ` Rafael J. Wysocki
2013-12-17 12:36       ` Tejun Heo
2013-12-18  0:23         ` Rafael J. Wysocki
2013-12-17 12:50     ` [PATCH v2] " Tejun Heo
2013-12-18  1:04       ` Rafael J. Wysocki
2013-12-18 11:08         ` Tejun Heo
2013-12-18 12:07       ` [PATCH v3] " Tejun Heo
2013-12-18 22:08         ` Rafael J. Wysocki
2013-12-19 17:24           ` Tejun Heo
2013-12-19 18:54         ` [PATCH v4] " Tejun Heo
2013-12-14  1:53 ` Writeback threads and freezable Dave Chinner
2013-12-14 17:30   ` Greg Kroah-Hartman
2013-12-14 20:23   ` Tejun Heo
2013-12-16  3:56     ` Dave Chinner
2013-12-16 12:51       ` Tejun Heo
2013-12-16 12:56         ` Tejun Heo
2013-12-18  0:35           ` Dave Chinner
2013-12-18 11:43             ` Tejun Heo
2013-12-18 22:14               ` Rafael J. Wysocki
2013-12-19  4:08               ` Dave Chinner
2013-12-19 16:24                 ` Tejun Heo
2013-12-20  0:51                   ` Dave Chinner
2013-12-20 14:51                     ` Tejun Heo
2013-12-20 14:00                   ` Rafael J. Wysocki

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=CACVXFVMPQUjAmvNpO+WVLDzVBwkwPtqqyBga_uXxfptVpEPPbw@mail.gmail.com \
    --to=tom.leiming@gmail.com \
    --cc=aaron.lu@intel.com \
    --cc=axboe@kernel.dk \
    --cc=fengguang.wu@intel.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=nigel@nigelcunningham.com.au \
    --cc=oleg@redhat.com \
    --cc=rafael.j.wysocki@intel.com \
    --cc=tj@kernel.org \
    --cc=tomaz.solc@tablix.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).