On Tue, 06 Jan 2015 12:54:43 -0500, Mikulas Patocka wrote:
> On Tue, 6 Jan 2015, Johannes Weiner wrote:
>
>> > The bug probably happened during git pull or apt-get update, though
>> > one can't be sure that these commands caused it.
>> >
>> > I see that 3.14.24 containes some fix for underflow (commit
>> > 6619741f17f541113a02c30f22a9ca22e32c9546, upstream commit
>> > abe5f972912d086c080be4bde67750630b6fb38b), but it doesn't seem that
>> > that commit fixes this condition. If you have a commit that could fix
>> > this, say it.
>>
>> That's an unrelated counter, but there is a known dirty underflow
>> problem that was addressed in 87a7e00b206a ("mm: protect
>> set_page_dirty() from ongoing truncation"). It should make it into the
>> stable kernels in the near future. Can you reproduce this issue?
>>
>> Thanks,
>> Johannes
>
> I can't reprodce it. It happened just once.
>
> That patch is supposed to fix an occasional underflow by a single page -
> while my meminfo showed underflow by 22952KiB (5738 pages).
You are probably looking for:
commit 835f252c6debd204fcd607c79975089b1ecd3472
"aio: fix uncorrent dirty pages accouting when truncating AIO ring buffer"
It definitely went into 3.14.26, don't know about 3.16.x.
-h
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