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aio: implement request batching

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Hi,

Some workloads issue batches of small I/O, and the performance is poor
due to the call to blk_run_address_space for every single iocb.  Nathan
Roberts pointed this out, and suggested that by deferring this call
until all I/Os in the iocb array are submitted to the block layer, we
can realize some impressive performance gains (up to 30% for sequential
4k reads in batches of 16).

Signed-off-by: Jeff Moyer <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jeff Moyer 2009-10-02 18:57:36 -04:00 • committed by Jens Axboe
commit cfb1e33eed
2 changed files with 63 additions and 6 deletions
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8
fs/direct-io.c
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@ -1028,9 +1028,6 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
if (dio->bio)
dio_bio_submit(dio);
/* All IO is now issued, send it on its way */
blk_run_address_space(inode->i_mapping);
/*
* It is possible that, we return short IO due to end of file.
* In that case, we need to release all the pages we got hold on.
@ -1057,8 +1054,11 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
((rw & READ) || (dio->result == dio->size)))
ret = -EIOCBQUEUED;
if (ret != -EIOCBQUEUED)
if (ret != -EIOCBQUEUED) {
/* All IO is now issued, send it on its way */
blk_run_address_space(inode->i_mapping);
dio_await_completion(dio);
}
/*
* Sync will always be dropping the final ref and completing the