Re: [PATCH 10/10] fs: make aio plug

From: Jeff Moyer
Date: Mon Jan 24 2011 - 14:29:51 EST

Jens Axboe <jaxboe@xxxxxxxxxxxx> writes:

> On 2011-01-24 20:15, Jeff Moyer wrote:
>> Jens Axboe <jaxboe@xxxxxxxxxxxx> 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.

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