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Re: [dm-devel] [PATCH] block: flush queued bios when the process blocks



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?

--
Jens Axboe


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