Re: [PATCH v2] mm: Allow to kill tasks doing pcpu_alloc() and waiting for pcpu_balance_workfn()

[Tejun Heo]

On Mon, Mar 19, 2018 at 06:32:10PM +0300, Kirill Tkhai wrote:
> From: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
> 
> In case of memory deficit and low percpu memory pages,
> pcpu_balance_workfn() takes pcpu_alloc_mutex for a long
> time (as it makes memory allocations itself and waits
> for memory reclaim). If tasks doing pcpu_alloc() are
> choosen by OOM killer, they can't exit, because they
> are waiting for the mutex.
> 
> The patch makes pcpu_alloc() to care about killing signal
> and use mutex_lock_killable(), when it's allowed by GFP
> flags. This guarantees, a task does not miss SIGKILL
> from OOM killer.
> 
> Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>

Applied to percpu/for-4.16-fixes.

Thanks.

-- 
tejun