Re: [PATCH] per process request limits (was Re: IO scheduler, queuedepth, nr_requests)

[Nick Piggin]

Andrew Morton wrote:

> Nick Piggin <piggin@xxxxxxxxxxxxxxx> 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.


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