Re: [PATCH] mm: preallocate page before lock_page at filemap COW.(WasRe: [PATCH V2] mm: Do not keep page locked during page fault while chargingit for memcg

[Lutz Vieweg]

On 07/12/2011 11:48 AM, Michal Hocko wrote:
> Is there any intereset in discussing this or the email just got lost?
> Just for reference preallocation patch from Kamezawa is already in the
> Andrew's tree.

It's been a long time since this discussion, I just wanted to add
that I've been recently able to confirm the ability of memcg
to prevent single users from DOSing a system by "make -j" - in
a real-world scenario (using linux-3.2.1).

So thanks to all who contributed to the solution in whatever way :-)

(A minor issue remained: The kernel is very verbose when
killing tasks due to memcg restrictions. In fork-bomb like
scenarios, this can lead to high resource utilization for
syslog et al.)

Regards,

Lutz Vieweg

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