[dm-devel] [PATCH] block: flush queued bios when the process blocks
axboe at kernel.dk
Tue May 27 15:08:41 UTC 2014
On 2014-05-27 09:03, Mikulas Patocka wrote:
> The block layer uses per-process bio list to avoid recursion in
> generic_make_request. When generic_make_request is called recursively, the
> bio is added to current->bio_list and the function returns immediatelly.
> The top-level instance of generic_make_requests takes bios from
> current->bio_list and processes them.
This really begs the question of why we just don't use the per-process
plugs for this. We already have scheduler hooks in place to flush those
at the appropriate time. Why are we reinventing something for
essentially the same thing?
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