linux-kernel - Re: [PATCH 10/10] fs: make aio plug

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Date:	Mon, 24 Jan 2011 20:31:40 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>,
	Shaohua Li <shaohua.li@...el.com>
Subject: Re: [PATCH 10/10] fs: make aio plug

On 2011-01-24 20:29, Jeff Moyer wrote:
> Jens Axboe <jaxboe@...ionio.com> writes:
> 
>> On 2011-01-24 20:15, Jeff Moyer wrote:
>>> Jens Axboe <jaxboe@...ionio.com> writes:
>>>
>>>>>> @@ -1698,6 +1701,7 @@ long do_io_submit(aio_context_t ctx_id, long nr,
>>>>>>  		if (ret)
>>>>>>  			break;
>>>>>>  	}
>>>>>> +	blk_finish_plug(&plug);
>>>>>>  	aio_batch_free(batch_hash);
>>>>>
>>>>> I'm pretty sure you want blk_finish_plug to run after aio_batch_free.
>>>>
>>>> You mean to cover the iput()? That's not a bad idea, if that ends up
>>>> writing it out. I did a few read tests here and confirmed it's sending
>>>> down batches of whatever number is submitted.
>>>
>>> No, I actually didn't make it all the way through 5/10, so I didn't
>>> realize you got rid of the blk_run_address_space.  I agree with the TODO
>>> item to get rid of the aio batching, since it's now taken care of with
>>> the on-stack plugging.
>>
>> Oh, so that was the whole point of the series :-)
> 
> I've said dumber things, I'm sure.  =)

;-)

>>> As for the iput, I don't think you will get the final iput here, since
>>> you've just scheduled I/O against the file.
>>
>> Good point, so the original comment is moot - it wont make a difference.
>> Still, may not be a bad idea to do the freeing first. I was sort-of
>> hoping to be able to kill the batching in fs/aio.c completely, though...
> 
> Yes, that's what I meant above when I said I agreed with the TODO item.
> Go ahead and nuke it.

Will do, if you promise to help test it :-)

-- 
Jens Axboe

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