Re: [PATCH 0/9] mm: improve OOM mechanism v2

[Johannes Weiner <hannes@cmpxchg.org>]

Hi Andrew,

since patches 8 and 9 are still controversial, would you mind picking
up just 1-7 for now?  They're cleaunps nice to have on their own.

Thanks,
Johannes

On Mon, Apr 27, 2015 at 03:05:46PM -0400, Johannes Weiner wrote:
> There is a possible deadlock scenario between the page allocator and
> the OOM killer.  Most allocations currently retry forever inside the
> page allocator, but when the OOM killer is invoked the chosen victim
> might try taking locks held by the allocating task.  This series, on
> top of many cleanups in the allocator & OOM killer, grants such OOM-
> killing allocations access to the system's memory reserves in order
> for them to make progress without relying on their own kill to exit.
> 
> Changes since v1:
> - drop GFP_NOFS deadlock fix (Dave Chinner)
> - drop low-order deadlock fix (Michal Hocko)
> - fix missing oom_lock in sysrq+f (Michal Hocko)
> - fix PAGE_ALLOC_COSTLY retry condition (Michal Hocko)
> - ALLOC_NO_WATERMARKS only for OOM victims, not all killed tasks (Tetsuo Handa)
> - bump OOM wait timeout from 1s to 5s (Vlastimil Babka & Michal Hocko)
> 
>  drivers/staging/android/lowmemorykiller.c |   2 +-
>  drivers/tty/sysrq.c                       |   2 +
>  include/linux/oom.h                       |  12 +-
>  kernel/exit.c                             |   2 +-
>  mm/memcontrol.c                           |  20 ++--
>  mm/oom_kill.c                             | 167 +++++++---------------------
>  mm/page_alloc.c                           | 161 ++++++++++++---------------
>  7 files changed, 137 insertions(+), 229 deletions(-)
> 
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