Re: [PATCH 1/2] cfq-iosched: remove dead_key from cfq_io_context

[Konstantin Khlebnikov]

On 21.05.2010 13:40, Jens Axboe wrote:
> On Thu, May 20 2010, Konstantin Khlebnikov wrote:
> > Remove ->dead_key field from cfq_io_context to shrink its size to 128 bytes.
> > (64 bytes for 32-bit hosts)
> >
> > Use lower bit in ->key as dead-mark, instead of moving key to separate field.
> > After this for dead cfq_io_context we got cic->key != cfqd automatically.
> > Thus, io_context's last-hit cache should work without changing.
> >
> > Now to check ->key for non-dead state compare it with cfqd,
> > instead of checking ->key for non-null value as it was before.
> >
> > Plus remove obsolete race protection in cfq_cic_lookup.
> > This race gone after v2.6.24-1728-g4ac845a
>
> This, and the second patch, look really good. How much testing have you
> done with it?

I have run multiple fsstress and simultaneously switch io-scheduler in loop
for several hours, no oopses and leaks detected.
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