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* | blkdev: Simple cleanup in blkdev_issue_zeroout()Lukas Czerner2011-05-071-14/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In blkdev_issue_zeroout() we are submitting regular WRITE bios, so we do not need to check for -EOPNOTSUPP specifically in case of error. Also there is no need to have label submit: because there is no way to jump out from the while cycle without an error and we really want to exit, rather than try again. And also remove the check for (sz == 0) since at that point sz can never be zero. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> CC: Dmitry Monakhov <dmonakhov@openvz.org> CC: Jens Axboe <jaxboe@fusionio.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | blkdev: Submit discard bio in batches in blkdev_issue_discard()Lukas Czerner2011-05-071-40/+29Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently we are waiting for every submitted REQ_DISCARD bio separately, but it can have unwanted consequences of repeatedly flushing the queue, so we rather submit bios in batches and wait for the entire batch, hence narrowing the window of other ios going in. Use bio_batch_end_io() and struct bio_batch for that purpose, the same is used by blkdev_issue_zeroout(). Also change bio_batch_end_io() so we always set !BIO_UPTODATE in the case of error and remove the check for bb, since we are the only user of this function and we always set this. Remove bio_get()/bio_put() from the blkdev_issue_discard() since bio_alloc() and bio_batch_end_io() is doing the same thing, hence it is not needed anymore. I have done simple dd testing with surprising results. The script I have used is: for i in $(seq 10); do echo $i dd if=/dev/sdb1 of=/dev/sdc1 bs=4k & sleep 5 done /usr/bin/time -f %e ./blkdiscard /dev/sdc1 Running time of BLKDISCARD on the whole device: with patch without patch 0.95 15.58 So we can see that in this artificial test the kernel with the patch applied is approx 16x faster in discarding the device. Signed-off-by: Lukas Czerner <lczerner@redhat.com> CC: Dmitry Monakhov <dmonakhov@openvz.org> CC: Jens Axboe <jaxboe@fusionio.com> CC: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | block: hold queue if flush is running for non-queueable flush driveshaohua.li@intel.com2011-05-062-6/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In some drives, flush requests are non-queueable. When flush request is running, normal read/write requests can't run. If block layer dispatches such request, driver can't handle it and requeue it. Tejun suggested we can hold the queue when flush is running. This can avoid unnecessary requeue. Also this can improve performance. For example, we have request flush1, write1, flush 2. flush1 is dispatched, then queue is hold, write1 isn't inserted to queue. After flush1 is finished, flush2 will be dispatched. Since disk cache is already clean, flush2 will be finished very soon, so looks like flush2 is folded to flush1. In my test, the queue holding completely solves a regression introduced by commit 53d63e6b0dfb95882ec0219ba6bbd50cde423794: block: make the flush insertion use the tail of the dispatch list It's not a preempt type request, in fact we have to insert it behind requests that do specify INSERT_FRONT. which causes about 20% regression running a sysbench fileio workload. Stable: 2.6.39 only Cc: stable@kernel.org Signed-off-by: Shaohua Li <shaohua.li@intel.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | block: add a non-queueable flush flagshaohua.li@intel.com2011-05-061-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | flush request isn't queueable in some drives. Add a flag to let driver notify block layer about this. We can optimize flush performance with the knowledge. Stable: 2.6.39 only Cc: stable@kernel.org Signed-off-by: Shaohua Li <shaohua.li@intel.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | iosched: remove redundant sprintfKees Cook2011-05-061-6/+1Star
| | | | | | | | | | | | | | | | | | After the anticipatory scheduler was dropped, there was no need to special-case the request_module string. As such, drop the redundant sprintf and stack variable. Signed-off-by: Kees Cook <kees.cook@canonical.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | block: Remove 'plug/unplug' comment in blk_execute_rq_nowaitTao Ma2011-05-051-1/+1
|/ | | | | | | | unplug is replaced with blk_run_queue now in blk_execute_rq_nowait, so change the comment accordingly. Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: add blk_run_queue_asyncChristoph Hellwig2011-04-186-20/+33
| | | | | | | | | | Instead of overloading __blk_run_queue to force an offload to kblockd add a new blk_run_queue_async helper to do it explicitly. I've kept the blk_queue_stopped check for now, but I suspect it's not needed as the check we do when the workqueue items runs should be enough. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: blk_delay_queue() should use kblockd workqueueJens Axboe2011-04-181-1/+2
| | | | | Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: drop queue lock before calling __blk_run_queue() for kblockd puntJens Axboe2011-04-181-8/+25
| | | | | | | | | | If we know we are going to punt to kblockd, we can drop the queue lock before calling into __blk_run_queue() since it only does a safe bit test and a workqueue call. Since kblockd needs to grab this very lock as one of the first things it does, it's a good optimization to drop the lock before waking kblockd. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* Revert "block: add callback function for unplug notification"Jens Axboe2011-04-182-19/+0Star
| | | | | | | | | | | | | | | MD can't use this since it really requires us to be able to keep more than a single piece of state for the unplug. Commit 048c9374 added the required support for MD, so get rid of this now unused code. This reverts commit f75664570d8b75469cc468f23c2b27220984983b. Conflicts: block/blk-core.c Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: Enhance new plugging support to support general callbacksNeilBrown2011-04-181-0/+20
| | | | | | | | | | md/raid requires an unplug callback, but as it does not uses requests the current code cannot provide one. So allow arbitrary callbacks to be attached to the blk_plug. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: make unplug timer trace event correspond to the schedule() unplugJens Axboe2011-04-161-6/+12
| | | | | | | | | | | It's a pretty close match to what we had before - the timer triggering would mean that nobody unplugged the plug in due time, in the new scheme this matches very closely what the schedule() unplug now is. It's essentially the difference between an explicit unplug (IO unplug) or an implicit unplug (timer unplug, we scheduled with pending IO queued). Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: only force kblockd unplugging from the schedule() pathJens Axboe2011-04-151-6/+7
| | | | | | | | | For the explicit unplugging, we'd prefer to kick things off immediately and not pay the penalty of the latency to switch to kblockd. So let blk_finish_plug() do the run inline, while the implicit-on-schedule-out unplug will punt to kblockd. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: cleanup the block plug helper functionsChristoph Hellwig2011-04-151-18/+6Star
| | | | | | | | | | | | It's a bit of a mess currently. task->plug is being cleared and reset in __blk_finish_plug(), and blk_finish_plug() is testing for a NULL plug which cannot happen even from schedule() anymore since it uses blk_needs_flush_plug() to determine whether to call into this function at all. So get rid of some of the cruft. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block, blk-sysfs: Use the variable directly instead of a function callLiu Yuan2011-04-131-2/+1Star
| | | | | | | | | | | | In the function blk_register_queue(), var _dev_ is already assigned by disk_to_dev().So use it directly instead of calling disk_to_dev() again. Signed-off-by: Liu Yuan <tailai.ly@taobao.com> Modified by me to delete an empty line in the same function while in there anyway. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: move queue run on unplug to kblockdJens Axboe2011-04-121-1/+1
| | | | | | | | | | | | | | | | There are worries that we are now consuming a lot more stack in some cases, since we potentially call into IO dispatch from schedule() or io_schedule(). We can reduce this problem by moving the running of the queue to kblockd, like the old plugging scheme did as well. This may or may not be a good idea from a performance perspective, depending on how many tasks have queue plugs running at the same time. For even the slightly contended case, doing just a single queue run from kblockd instead of multiple runs directly from the unpluggers will be faster. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: kill queue_sync_plugs()Jens Axboe2011-04-121-14/+0Star
| | | | | | | | The original use for this dates back to when we had to track write requests for serializing around barriers. That's not needed anymore, so kill it. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: readd plug trace eventJens Axboe2011-04-121-1/+9
| | | | | | | | | This was removed with the queue plug state. But we can easily readd by checking if this is the first request going to this queue. It's good information to have when tracing to see how effective the plugging is. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: add callback function for unplug notificationJens Axboe2011-04-122-0/+19
| | | | | | | MD would like to know when a queue is unplugged, so it can flush it's bitmap writes. Add such a callback. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: add comment on why we save and disable interrupts in flush_plug_list()Jens Axboe2011-04-121-0/+5
| | | | | | It's done at the top to avoid doing it for every queue we unplug. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: fixup block IO unplug trace callJens Axboe2011-04-121-2/+13
| | | | | | | It was removed with the on-stack plugging, readd it and track the depth of requests added when flushing the plug. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: splice plug list to local contextNeilBrown2011-04-111-5/+9
| | | | | | | | | | | | | | | | | | | | If the request_fn ends up blocking, we could be re-entering the plug flush. Since the list is protected by explicitly not allowing schedule events, this isn't a terribly good idea. Additionally, it can cause us to recurse. As request_fn called by __blk_run_queue is allowed to 'schedule()' (after dropping the queue lock of course), it is possible to get a recursive call: schedule -> blk_flush_plug -> __blk_finish_plug -> flush_plug_list -> __blk_run_queue -> request_fn -> schedule We must make sure that the second schedule does not call into blk_flush_plug again. So instead of leaving the list of requests on blk_plug->list, move them to a separate list leaving blk_plug->list empty. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6Linus Torvalds2011-04-076-7/+7
|\ | | | | | | | | * 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6: Fix common misspellings
| * Fix common misspellingsLucas De Marchi2011-03-316-7/+7
| | | | | | | | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* | block: fix request sorting at unplugKonstantin Khlebnikov2011-04-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | Comparison function for list_sort() must be anticommutative, otherwise it is not sorting in ordinary meaning. But fortunately list_sort() always check ((*cmp)(priv, a, b) <= 0) it not distinguish negative and zero, so comparison function can implement only less-or-equal instead of full three-way comparison. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | dm: improve block integrity supportMike Snitzer2011-04-051-1/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current block integrity (DIF/DIX) support in DM is verifying that all devices' integrity profiles match during DM device resume (which is past the point of no return). To some degree that is unavoidable (stacked DM devices force this late checking). But for most DM devices (which aren't stacking on other DM devices) the ideal time to verify all integrity profiles match is during table load. Introduce the notion of an "initialized" integrity profile: a profile that was blk_integrity_register()'d with a non-NULL 'blk_integrity' template. Add blk_integrity_is_initialized() to allow checking if a profile was initialized. Update DM integrity support to: - check all devices with _initialized_ integrity profiles match during table load; uninitialized profiles (e.g. for underlying DM device(s) of a stacked DM device) are ignored. - disallow a table load that would result in an integrity profile that conflicts with a DM device's existing (in-use) integrity profile - avoid clearing an existing integrity profile - validate all integrity profiles match during resume; but if they don't all we can do is report the mismatch (during resume we're past the point of no return) Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | blk-throttle: don't call xchg on boolAndreas Schwab2011-04-051-2/+2
| | | | | | | | | | | | | | xchg does not work portably with smaller than 32bit types. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | block: make the flush insertion use the tail of the dispatch listJens Axboe2011-04-051-2/+2
| | | | | | | | | | | | | | It's not a preempt type request, in fact we have to insert it behind requests that do specify INSERT_FRONT. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | block: get rid of elv_insert() interfaceJens Axboe2011-04-052-22/+17Star
| | | | | | | | | | | | | | | | Merge it with __elv_add_request(), it's pretty pointless to have a function with only two callers. The main interface is elv_add_request()/__elv_add_request(). Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* | block: dump request state on seeing a corrupted request completionJens Axboe2011-04-051-1/+1
|/ | | | | | | | Currently we just dump a non-informative 'request botched' message. Lets actually try and print something sane to help debug issues around this. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: fix issue with calling blk_stop_queue() from the request_fn handlerJens Axboe2011-03-251-1/+1
| | | | | | | | | | | When the queue work handler was converted to delayed work, the stopping was inadvertently made sync as well. Change this back to being async stop, using __cancel_delayed_work() instead of cancel_delayed_work(). Reported-by: Jeremy Fitzhardinge <jeremy@goop.org> Reported-by: Chris Mason <chris.mason@oracle.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* block: fix bug with inserting flush requests as sort/mergeJens Axboe2011-03-251-1/+4
| | | | | | | | | | | | | | | | With the introduction of the on-stack plugging, we would assume that any request being inserted was a normal file system request. As flush/fua requires a special insert mode, this caused problems. Fix this up by checking for this in flush_plug_list() and use the appropriate insert mechanism. Big thanks goes to Markus Tripplesdorf for tirelessly testing patches, and to Sergey Senozhatsky for helping find the real issue. Reported-by: Markus Tripplesdorf <markus@trippelsdorf.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds2011-03-2417-656/+955
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block: (65 commits) Documentation/iostats.txt: bit-size reference etc. cfq-iosched: removing unnecessary think time checking cfq-iosched: Don't clear queue stats when preempt. blk-throttle: Reset group slice when limits are changed blk-cgroup: Only give unaccounted_time under debug cfq-iosched: Don't set active queue in preempt block: fix non-atomic access to genhd inflight structures block: attempt to merge with existing requests on plug flush block: NULL dereference on error path in __blkdev_get() cfq-iosched: Don't update group weights when on service tree fs: assign sb->s_bdi to default_backing_dev_info if the bdi is going away block: Require subsystems to explicitly allocate bio_set integrity mempool jbd2: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging jbd: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging fs: make fsync_buffers_list() plug mm: make generic_writepages() use plugging blk-cgroup: Add unaccounted time to timeslice_used. block: fixup plugging stubs for !CONFIG_BLOCK block: remove obsolete comments for blkdev_issue_zeroout. blktrace: Use rq->cmd_flags directly in blk_add_trace_rq. ... Fix up conflicts in fs/{aio.c,super.c}
| * cfq-iosched: removing unnecessary think time checkingLi, Shaohua2011-03-231-9/+4Star
| | | | | | | | | | | | | | | | | | | | Removing think time checking. A high thinktime queue might means the queue dispatches several requests and then do away. Limitting such queue seems meaningless. And also this can simplify code. This is suggested by Vivek. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * cfq-iosched: Don't clear queue stats when preempt.Justin TerAvest2011-03-231-22/+17Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For v2, I added back lines to cfq_preempt_queue() that were removed during updates for accounting unaccounted_time. Thanks for pointing out that I'd missed these, Vivek. Previous commit "cfq-iosched: Don't set active queue in preempt" wrongly cleared stats for preempting queues when it shouldn't have, because when we choose a queue to preempt, it still isn't necessarily scheduled next. Thanks to Vivek Goyal for figuring this out and understanding how the preemption code works. Signed-off-by: Justin TerAvest <teravest@google.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * blk-throttle: Reset group slice when limits are changedVivek Goyal2011-03-221-1/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Lina reported that if throttle limits are initially very high and then dropped, then no new bio might be dispatched for a long time. And the reason being that after dropping the limits we don't reset the existing slice and do the rate calculation with new low rate and account the bios dispatched at high rate. To fix it, reset the slice upon rate change. https://lkml.org/lkml/2011/3/10/298 Another problem with very high limit is that we never queued the bio on throtl service tree. That means we kept on extending the group slice but never trimmed it. Fix that also by regulary trimming the slice even if bio is not being queued up. Reported-by: Lina Lu <lulina_nuaa@foxmail.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * blk-cgroup: Only give unaccounted_time under debugJustin TerAvest2011-03-221-10/+10
| | | | | | | | | | | | | | | | This change moves unaccounted_time to only be reported when CONFIG_DEBUG_BLK_CGROUP is true. Signed-off-by: Justin TerAvest <teravest@google.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * cfq-iosched: Don't set active queue in preemptJustin TerAvest2011-03-221-16/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | Commit "Add unaccounted time to timeslice_used" changed the behavior of cfq_preempt_queue to set cfqq active. Vivek pointed out that other preemption rules might get involved, so we shouldn't manually set which queue is active. This cleans up the code to just clear the queue stats at preemption time. Signed-off-by: Justin TerAvest <teravest@google.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * block: attempt to merge with existing requests on plug flushJens Axboe2011-03-214-4/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | One of the disadvantages of on-stack plugging is that we potentially lose out on merging since all pending IO isn't always visible to everybody. When we flush the on-stack plugs, right now we don't do any checks to see if potential merge candidates could be utilized. Correct this by adding a new insert variant, ELEVATOR_INSERT_SORT_MERGE. It works just ELEVATOR_INSERT_SORT, but first checks whether we can merge with an existing request before doing the insertion (if we fail merging). This fixes a regression with multiple processes issuing IO that can be merged. Thanks to Shaohua Li <shaohua.li@intel.com> for testing and fixing an accounting bug. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * cfq-iosched: Don't update group weights when on service treeJustin TerAvest2011-03-171-12/+41
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Version 3 is updated to apply to for-2.6.39/core. For version 2, I took Vivek's advice and made sure we update the group weight from cfq_group_service_tree_add(). If a weight was updated while a group is on the service tree, the calculation for the total weight of the service tree can be adjusted improperly, which either leads to bad service tree weights, or potentially crashes (if total_weight becomes 0). This patch defers updates to the weight until a group is off the service tree. Signed-off-by: Justin TerAvest <teravest@google.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * blk-cgroup: Add unaccounted time to timeslice_used.Justin TerAvest2011-03-124-14/+41
| | | | | | | | | | | | | | | | | | | | | | | | There are two kind of times that tasks are not charged for: the first seek and the extra time slice used over the allocated timeslice. Both of these exported as a new unaccounted_time stat. I think it would be good to have this reported in 'time' as well, but that is probably a separate discussion. Signed-off-by: Justin TerAvest <teravest@google.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * block: remove obsolete comments for blkdev_issue_zeroout.Tao Ma2011-03-111-2/+0Star
| | | | | | | | | | | | | | | | | | barrier is already removed, so remove the obsolete comments in blkdev_issue_zeroout. Cc: Jens Axboe <jaxboe@fusionio.com> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * Merge branch 'for-2.6.39/stack-plug' into for-2.6.39/coreJens Axboe2011-03-1010-315/+323
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: block/blk-core.c block/blk-flush.c drivers/md/raid1.c drivers/md/raid10.c drivers/md/raid5.c fs/nilfs2/btnode.c fs/nilfs2/mdt.c Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| | * blk-throttle: Use blk_plug in throttle dispatchVivek Goyal2011-03-101-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | Use plug in throttle dispatch also as we are dispatching a bunch of bios in throttle context and some of them might merge. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| | * block: kill off REQ_UNPLUGJens Axboe2011-03-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the plugging now being explicitly controlled by the submitter, callers need not pass down unplugging hints to the block layer. If they want to unplug, it's because they manually plugged on their own - in which case, they should just unplug at will. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| | * block: remove per-queue pluggingJens Axboe2011-03-1010-233/+26Star
| | | | | | | | | | | | | | | | | | | | | | | | Code has been converted over to the new explicit on-stack plugging, and delay users have been converted to use the new API for that. So lets kill off the old plugging along with aops->sync_page(). Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| | * block: initial patch for on-stack per-task pluggingJens Axboe2011-03-103-101/+277
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for creating a queuing context outside of the queue itself. This enables us to batch up pieces of IO before grabbing the block device queue lock and submitting them to the IO scheduler. The context is created on the stack of the process and assigned in the task structure, so that we can auto-unplug it if we hit a schedule event. The current queue plugging happens implicitly if IO is submitted to an empty device, yet callers have to remember to unplug that IO when they are going to wait for it. This is an ugly API and has caused bugs in the past. Additionally, it requires hacks in the vm (->sync_page() callback) to handle that logic. By switching to an explicit plugging scheme we make the API a lot nicer and can get rid of the ->sync_page() hack in the vm. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| | * block: add API for delaying work/request_fn a little bitJens Axboe2011-03-101-0/+29
| | | | | | | | | | | | | | | | | | | | | Currently we use plugging for that, but as plugging is going away, we need an alternative mechanism. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| * | block: Don't implicitly trigger event check on disk_unblock_events()Tejun Heo2011-03-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, disk_unblock_events() implicitly kick event check if the block count reaches zero. This behavior is not described in the comment and hinders with future changes. Make the unblocker explicitly check events by calling disk_check_events() as necessary. This patch doesn't cause any behavior difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kay Sievers <kay.sievers@vrfy.org>
| * | blk-cgroup: Lower minimum weight from 100 to 10.Justin TerAvest2011-03-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We've found that we still get good, useful isolation at weights this low. I'd like to adjust the minimum so that any other changes can take these values into account. Signed-off-by: Justin TerAvest <teravest@google.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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