Re: can't oom-kill zap the victim's memory?

[Oleg Nesterov]

On 09/20, Raymond Jennings wrote:
>
> On 09/20/15 11:05, Linus Torvalds wrote:
>>
>> which can be called from just about any context (but atomic
>> allocations will never get here, so it can schedule etc).
>
> I think in this case the oom killer should just slap a SIGKILL on the
> task and then back out, and whatever needed the memory should just wait
> patiently for the sacrificial lamb to commit seppuku.

Not sure I understand you correctly, but this is what we currently do.
The only problem is that this doesn't work sometimes.

> Also, I observed that a task in the middle of dumping core doesn't
> respond to signals while it's dumping,

How did you observe this? The coredumping is killable.

Although yes, we have problems here in oom condition. In particular
with CLONE_VM tasks.

Oleg.

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