On Mon, 17 Dec 2012 20:45:13 -0800 (PST)
Hugh Dickins<hughd@xxxxxxxxxx> wrote:
On Fri, 14 Dec 2012, Konstantin Khlebnikov wrote:
This bio pool guarantees reclaiming progress for anonymous pages.
All avaliable bio in fs_bio_set may be borrowed by writeback which may
never ends, because disk too slow or broken. I have seen this situation in
real life in system where was a lot of bio requests to a loop device which
laying on top of special fuse-based filesystem.
Hmm, perhaps, I'm not at all sure.
It probably maybe perhaps makes sense. Of course, you're screwed if
one of your swap devices is "disk too slow or broken".
My crystal ball tells me that the 2015 kernel will have a bioset per
physical device...