From: Andrew Morton <akpm@linux-foundation.org>
To: Ming Lei <ming.lei@canonical.com>
Cc: linux-kernel@vger.kernel.org,
Alan Stern <stern@rowland.harvard.edu>,
Oliver Neukum <oneukum@suse.de>, Minchan Kim <minchan@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Jens Axboe <axboe@kernel.dk>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, linux-usb@vger.kernel.org,
linux-pm@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v6 0/6] solve deadlock caused by memory allocation with I/O
Date: Tue, 27 Nov 2012 12:25:36 -0800 [thread overview]
Message-ID: <20121127122536.a0e94ab8.akpm@linux-foundation.org> (raw)
In-Reply-To: <1353761958-12810-1-git-send-email-ming.lei@canonical.com>
On Sat, 24 Nov 2012 20:59:12 +0800
Ming Lei <ming.lei@canonical.com> wrote:
> This patchset try to solve one deadlock problem which might be caused
> by memory allocation with block I/O during runtime PM and block device
> error handling path. Traditionly, the problem is addressed by passing
> GFP_NOIO statically to mm, but that is not a effective solution, see
> detailed description in patch 1's commit log.
>
> This patch set introduces one process flag and trys to fix the deadlock
> problem on block device/network device during runtime PM or usb bus reset.
>
> The 1st one is the change on include/sched.h and mm.
>
> The 2nd patch introduces the flag of memalloc_noio on 'dev_pm_info',
> and pm_runtime_set_memalloc_noio(), so that PM Core can teach mm to not
> allocate mm with GFP_IO during the runtime_resume callback only on
> device with the flag set.
>
> The following 2 patches apply the introduced pm_runtime_set_memalloc_noio()
> to mark all devices as memalloc_noio_resume in the path from the block or
> network device to the root device in device tree.
>
> The last 2 patches are applied again PM and USB subsystem to demonstrate
> how to use the introduced mechanism to fix the deadlock problem.
>
> Andrew, could you queue these patches into your tree since V6 fixes all
> your concerns and looks no one objects these patches?
Yes, this patchset looks ready to run with. But as we're at -rc7 I'll ask
you to refresh, retest and resend after 3.8-rc1, please.
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prev parent reply other threads:[~2012-11-27 20:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-24 12:59 [PATCH v6 0/6] solve deadlock caused by memory allocation with I/O Ming Lei
2012-11-24 12:59 ` [PATCH v6 1/6] mm: teach mm by current context info to not do I/O during memory allocation Ming Lei
2012-11-24 12:59 ` [PATCH v6 2/6] PM / Runtime: introduce pm_runtime_set_memalloc_noio() Ming Lei
2012-11-27 21:19 ` Rafael J. Wysocki
2012-11-27 21:46 ` Rafael J. Wysocki
2012-11-28 3:57 ` Ming Lei
2012-11-28 10:06 ` Rafael J. Wysocki
2012-11-28 13:51 ` Ming Lei
2012-11-28 4:34 ` Ming Lei
2012-11-28 9:29 ` Rafael J. Wysocki
2012-11-28 9:47 ` Ming Lei
2012-11-28 10:15 ` Rafael J. Wysocki
2012-11-24 12:59 ` [PATCH v6 3/6] block/genhd.c: apply pm_runtime_set_memalloc_noio on block devices Ming Lei
2012-11-24 12:59 ` [PATCH v6 4/6] net/core: apply pm_runtime_set_memalloc_noio on network devices Ming Lei
2012-11-24 12:59 ` [PATCH v6 5/6] PM / Runtime: force memory allocation with no I/O during Runtime PM callbcack Ming Lei
2012-11-27 21:24 ` Rafael J. Wysocki
2012-11-28 3:06 ` Ming Lei
2012-11-24 12:59 ` [PATCH v6 6/6] USB: forbid memory allocation with I/O during bus reset Ming Lei
2012-11-27 20:25 ` Andrew Morton [this message]
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