[BLOCK] Implement elv_drain_elevator for improved switch error detection

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This patch adds request_queue->nr_sorted which keeps the number of
requests in the iosched and implement elv_drain_elevator which
performs forced dispatching.  elv_drain_elevator checks whether
iosched actually dispatches all requests it has and prints error
message if it doesn't.  As buggy forced dispatching can result in
wrong barrier operations, I think this extra check is worthwhile.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>

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Tejun Heo 2005-11-10 08:52:05 +01:00 • committed by Jens Axboe

parent 1b5ed5e1f1

commit 15853af9f0

2 changed files with 22 additions and 5 deletions

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25

block/elevator.c

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2

include/linux/blkdev.h

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