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aio: only use blk plugs for > 2 depth submissions 

Plugging is meant to optimize submission of a string of IOs, if we don't
have more than 2 being submitted, don't bother setting up a plug.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-12-04 09:45:32 -07:00
parent 2bc4ca9bb6
commit a79d40e9b0
1 changed files with 14 additions and 4 deletions
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18
fs/aio.c
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@ -70,6 +70,12 @@ struct aio_ring {
struct io_event io_events[0];
}; /* 128 bytes + ring size */
/*
* Plugging is meant to work with larger batches of IOs. If we don't
* have more than the below, then don't bother setting up a plug.
*/
#define AIO_PLUG_THRESHOLD 2
#define AIO_RING_PAGES 8
struct kioctx_table {
@ -1921,7 +1927,8 @@ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
if (nr > ctx->nr_events)
nr = ctx->nr_events;
blk_start_plug(&plug);
if (nr > AIO_PLUG_THRESHOLD)
blk_start_plug(&plug);
for (i = 0; i < nr; i++) {
struct iocb __user *user_iocb;
@ -1934,7 +1941,8 @@ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
if (ret)
break;
}
blk_finish_plug(&plug);
if (nr > AIO_PLUG_THRESHOLD)
blk_finish_plug(&plug);
percpu_ref_put(&ctx->users);
return i ? i : ret;
@ -1961,7 +1969,8 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
if (nr > ctx->nr_events)
nr = ctx->nr_events;
blk_start_plug(&plug);
if (nr > AIO_PLUG_THRESHOLD)
blk_start_plug(&plug);
for (i = 0; i < nr; i++) {
compat_uptr_t user_iocb;
@ -1974,7 +1983,8 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
if (ret)
break;
}
blk_finish_plug(&plug);
if (nr > AIO_PLUG_THRESHOLD)
blk_finish_plug(&plug);
percpu_ref_put(&ctx->users);
return i ? i : ret;