Re: [PATCH 0/2] /proc/stat vs. failed order-4 allocation

[Andrew Morton]

On Mon, 16 Jun 2014 11:04:50 +0200 Heiko Carstens <heiko.carstens@xxxxxxxxxx> wrote:

> These two patches are supposed to "fix" failed order-4 memory
> allocations which have been observed when reading /proc/stat.
> The problem has been observed on s390 as well as on x86.
> 
> To address the problem change the seq_file memory allocations to
> fallback to use vmalloc, so that allocations also work if memory
> is fragmented.
> 
> This approach seems to be simpler and less intrusive than changing
> /proc/stat to use an interator. Also it "fixes" other users as well,
> which use seq_file's single_open() interface.

Yes, those changes look pretty simple and effective.

I'm unclear on how urgent these fixes are.  I semi-randomly tagged them
for 3.16 with a -stable backport, but that could be changed?

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