Re: [PATCH 4.7 000/143] 4.7.3-stable review

[Markus Trippelsdorf]

On 2016.09.05 at 18:42 +0200, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.7.3 release.
> There are 143 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Wed Sep  7 16:44:10 UTC 2016.
> Anything received after that time might be too late.

As far as I can see this missing an rather important mm fix from Michal Hocko.

commit 6b4e3181d7bd5ca5ab6f45929e4a5ffa7ab4ab7f
Author: Michal Hocko <mhocko@xxxxxxxx>
Date:   Thu Sep 1 16:14:41 2016 -0700

    mm, oom: prevent premature OOM killer invocation for high order request
    
    There have been several reports about pre-mature OOM killer invocation
    in 4.7 kernel when order-2 allocation request (for the kernel stack)
    invoked OOM killer even during basic workloads (light IO or even kernel
    compile on some filesystems).  In all reported cases the memory is
    fragmented and there are no order-2+ pages available.  There is usually
    a large amount of slab memory (usually dentries/inodes) and further
    debugging has shown that there are way too many unmovable blocks which
    are skipped during the compaction.  Multiple reporters have confirmed
    that the current linux-next which includes [1] and [2] helped and OOMs
    are not reproducible anymore.
    
    A simpler fix for the late rc and stable is to simply ignore the
    compaction feedback and retry as long as there is a reclaim progress and
    we are not getting OOM for order-0 pages.  We already do that for
    CONFING_COMPACTION=n so let's reuse the same code when compaction is
    enabled as well.
    
    [1] http://lkml.kernel.org/r/20160810091226.6709-1-vbabka@xxxxxxx
    [2] http://lkml.kernel.org/r/f7a9ea9d-bb88-bfd6-e340-3a933559305a@xxxxxxx
    
    Fixes: 0a0337e0d1d1 ("mm, oom: rework oom detection")
    Link: http://lkml.kernel.org/r/20160823074339.GB23577@xxxxxxxxxxxxxx
    Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
    Tested-by: Olaf Hering <olaf@xxxxxxxxx>
    Tested-by: Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@xxxxxxxxxxx>
    Cc: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
    Cc: Arkadiusz Miskiewicz <a.miskiewicz@xxxxxxxxx>
    Cc: Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@xxxxxxxxxxx>
    Cc: Jiri Slaby <jslaby@xxxxxxxx>
    Cc: Vlastimil Babka <vbabka@xxxxxxx>
    Cc: Joonsoo Kim <js1304@xxxxxxxxx>
    Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
    Cc: David Rientjes <rientjes@xxxxxxxxxx>
    Cc: <stable@xxxxxxxxxxxxxxx>    [4.7.x]
    Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

-- 
Markus