On Thu, Jun 29, 2017 at 06:23:43PM +0100, Ben Hutchings wrote:

On Mon, 2017-06-19 at 23:20 +0800, Greg Kroah-Hartman wrote:

quoted

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yu Zhao <redacted>

commit ef70762948dde012146926720b70e79736336764 upstream.

I saw need_resched() warnings when swapping on large swapfile (TBs)
because continuously allocating many pages in swap_cgroup_prepare() took
too long.

We already cond_resched when freeing page in swap_cgroup_swapoff().  Do
the same for the page allocation.

[...]

That seems to imply that this should also go into stable branches:

commit 460bcec84e11c75122ace5976214abbc596eb91b
Author: David Rientjes [off-list ref]
Date:   Fri Apr 7 16:05:00 2017 -0700

    mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff()
    

Looks like it to me, thanks, now queued up.

greg k-h