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| author | Jeff Moyer <jmoyer@redhat.com> | 2007-10-16 23:27:20 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:53 -0700 |
| commit | 41d10da3717409de33d5441f2f6d8f072ab3fbb6 (patch) | |
| tree | 4822afef881132248a7c91ba6eb33065f3209f2b /fs/aio.c | |
| parent | c17ac85504efec5f3a9b0c5b05bffd6f30e5b655 (diff) | |
| download | lwn-41d10da3717409de33d5441f2f6d8f072ab3fbb6.tar.gz lwn-41d10da3717409de33d5441f2f6d8f072ab3fbb6.zip | |
aio: account I/O wait time properly
Some months back I proposed changing the schedule() call in
read_events to an io_schedule():
http://osdir.com/ml/linux.kernel.aio.general/2006-10/msg00024.html
This was rejected as there are AIO operations that do not initiate
disk I/O. I've had another look at the problem, and the only AIO
operation that will not initiate disk I/O is IOCB_CMD_NOOP. However,
this command isn't even wired up!
Given that it doesn't work, and hasn't for *years*, I'm going to
suggest again that we do proper I/O accounting when using AIO.
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Zach Brown <zach.brown@oracle.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Suparna Bhattacharya <suparna@in.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/aio.c')
| -rw-r--r-- | fs/aio.c | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -303,7 +303,7 @@ static void wait_for_all_aios(struct kioctx *ctx) set_task_state(tsk, TASK_UNINTERRUPTIBLE); while (ctx->reqs_active) { spin_unlock_irq(&ctx->ctx_lock); - schedule(); + io_schedule(); set_task_state(tsk, TASK_UNINTERRUPTIBLE); spin_lock_irq(&ctx->ctx_lock); } @@ -323,7 +323,7 @@ ssize_t fastcall wait_on_sync_kiocb(struct kiocb *iocb) set_current_state(TASK_UNINTERRUPTIBLE); if (!iocb->ki_users) break; - schedule(); + io_schedule(); } __set_current_state(TASK_RUNNING); return iocb->ki_user_data; @@ -1170,7 +1170,7 @@ retry: ret = 0; if (to.timed_out) /* Only check after read evt */ break; - schedule(); + io_schedule(); if (signal_pending(tsk)) { ret = -EINTR; break; |