linux-kernel - Re: [PATCH 1/2] cfq-iosched: remove dead_key from cfq_io

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Message-ID: <4BF69E82.4060904@parallels.com>
Date:	Fri, 21 May 2010 18:53:54 +0400
From:	Konstantin Khlebnikov <khlebnikov@...allels.com>
To:	Jens Axboe <axboe@...nel.dk>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: Re: [PATCH 1/2] cfq-iosched: remove dead_key from cfq_io_context

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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