linux-kernel - [PATCH v4 0/2] virtio_balloon: Fix restore and convert to workqueue

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Date:	Fri,  4 Dec 2015 14:37:49 +0100
From:	Petr Mladek <pmladek@...e.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Jeff Epler <jepler@...ythonic.net>, Tejun Heo <tj@...nel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>
Subject: [PATCH v4 0/2] virtio_balloon: Fix restore and convert to workqueue

It has been long since I have sent v3 of the balloon conversion from
a kthread to a workqueue. I have gained some more experience with
the APIs in the meantime. I hope that you would like the outcome.

I have added one more patch that fixes a separate problem with
restoring the balloon after the system freeze. I have found this
when testing the conversion.

Changes against v3:

  + rebased on 4.4-rc3

  + call cancel_work_synch() when removing the balloon

  + do not queue the work from fill_balloon() and leak_balloon()
    because they are called also independently from the workqueue,
    e.g. remove_common(), virtballoon_oom_notify(). Re-queue
    the work from the work function when necessary.


Changes against v2:

  + Use system_freezable_wq instead of an allocated one
    and move INIT_WORK() higher in virtballoon_probe().

  + Fix typos in the commit message.


Changes against v1:

  + More elegant detection of the pending work in fill_balloon() and
    leak_balloon(). It still needs to keep the original requested number
    of pages but it does not add any extra boolean variable.

  + Remove WQ_MEM_RECLAIM workqueue parameter. If I get it correctly,
    this is possible because the code manipulates memory but it is not
    used in the memory reclaim path.

  + initialize the work item before allocation the workqueue

JFYI, the discussion about the previous version can be found at
http://thread.gmane.org/gmane.linux.kernel.virtualization/23701

Petr Mladek (2):
  virtio_balloon: Restore the entire balloon after the system freeze
  virtio_balloon: Use a workqueue instead of "vballoon" kthread

 drivers/virtio/virtio_balloon.c | 93 ++++++++++++++++-------------------------
 1 file changed, 35 insertions(+), 58 deletions(-)

-- 
1.8.5.6

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