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authorJens Axboe <jaxboe@fusionio.com>2011-05-17 13:04:44 +0400
committerJens Axboe <jaxboe@fusionio.com>2011-05-17 13:04:44 +0400
commit9937a5e2f32892db0dbeefc2b3bc74b3ae3ea9c7 (patch)
tree0448e96b503deb71dd8a1228da94a9fc22a57d48 /include/scsi/scsi_device.h
parent70087dc38cc77ca8f46059564c00338777734762 (diff)
downloadlinux-9937a5e2f32892db0dbeefc2b3bc74b3ae3ea9c7.tar.xz
scsi: remove performance regression due to async queue run
Commit c21e6beb removed our queue request_fn re-enter protection, and defaulted to always running the queues from kblockd to be safe. This was a known potential slow down, but should be safe. Unfortunately this is causing big performance regressions for some, so we need to improve this logic. Looking into the details of the re-enter, the real issue is on requeue of requests. Requeue of requests upon seeing a BUSY condition from the device ends up re-running the queue, causing traces like this: scsi_request_fn() scsi_dispatch_cmd() scsi_queue_insert() __scsi_queue_insert() scsi_run_queue() scsi_request_fn() ... potentially causing the issue we want to avoid. So special case the requeue re-run of the queue, but improve it to offload the entire run of local queue and starved queue from a single workqueue callback. This is a lot better than potentially kicking off a workqueue run for each device seen. This also fixes the issue of the local device going into recursion, since the above mentioned commit never moved that queue run out of line. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include/scsi/scsi_device.h')
-rw-r--r--include/scsi/scsi_device.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 2d3ec5094685..dd82e02ddde3 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -169,6 +169,7 @@ struct scsi_device {
sdev_dev;
struct execute_work ew; /* used to get process context on put */
+ struct work_struct requeue_work;
struct scsi_dh_data *scsi_dh_data;
enum scsi_device_state sdev_state;