[linux-lvm] Re: [PATCH] per process request limits (was Re: IO scheduler, queue depth, nr_requests)

[Nick Piggin]

Andrew Morton wrote:

>Nick Piggin <piggin at cyberone.com.au> wrote:
>
>>Even with this patch, it might still be a good idea to allow
>>pdflush to disregard the limits...
>>
>
>Has it been confirmed that pdflush is blocking in get_request_wait()?  I
>guess that can happen very occasionally because we don't bother with any
>locking around there but if it's happening a lot then something is bust.
>
>

Miquel's analysis is pretty plausible, but I'm not sure if
he's confirmed it or not, Miquel? Even if it isn't happening
a lot, and something isn't bust it might be a good idea to
do this.