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* block: simplify I/O stat accountingJerome Marchand2009-04-241-6/+1
| | | | | | | | | | | | This simplifies I/O stat accounting switching code and separates it completely from I/O scheduler switch code. Requests are accounted according to the state of their request queue at the time of the request allocation. There is no need anymore to flush the request queue when switching I/O accounting state. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: fix bad spelling of quiesceJens Axboe2009-04-151-2/+2
| | | | | | Credit goes to Andrew Morton for spotting this one. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: fix inconsistency in I/O stat accounting codeJerome Marchand2009-04-071-4/+6
| | | | | | | | | This forces in_flight to be zero when turning off or on the I/O stat accounting and stops updating I/O stats in attempt_merge() when accounting is turned off. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: elevator quiescing helpersJens Axboe2009-04-071-0/+4
| | | | | | | | | Simple helper functions to quiesce the request queue. These are currently only used for switching IO schedulers on-the-fly, but we can use them to properly switch IO accounting on and off as well. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* cpumask: use topology_core_cpumask/topology_thread_cpumask instead of ↵Rusty Russell2009-03-131-1/+1
| | | | | | | | | | | | cpu_core_map/cpu_sibling_map Impact: cleanup This is presumably what those definitions are for, and while all archs define cpu_core_map/cpu_sibling map, that's changing (eg. x86 wants to change it to a pointer). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* block: fix oops in blk_queue_io_stat()Jens Axboe2009-02-021-0/+8
| | | | | | | | Some initial probe requests don't have disk->queue mapped yet, so we can't rely on a non-NULL queue in blk_queue_io_stat(). Wrap it in blk_do_io_stat(). Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* cpumask: Replace cpu_coregroup_map with cpu_coregroup_maskRusty Russell2008-12-261-2/+2
| | | | | | | | | | | | cpu_coregroup_map returned a cpumask_t: it's going away. (Note, the sched part of this patch won't apply meaningfully to the sched tree, but I'm posting it to show the goal). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Ingo Molnar <mingo@redhat.com>
* block: remove __generic_unplug_device() from exportsJens Axboe2008-10-171-0/+1
| | | | | | | The only out-of-core user is IDE, and that should be using blk_start_queueing() instead. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: add fault injection mechanism for faking request timeoutsJens Axboe2008-10-091-0/+12
| | | | | | | | Only works for the generic request timer handling. Allows one to sporadically ignore request completions, thus exercising the timeout handling. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: unify request timeout handlingJens Axboe2008-10-091-0/+24
| | | | | | | | | | | | | Right now SCSI and others do their own command timeout handling. Move those bits to the block layer. Instead of having a timer per command, we try to be a bit more clever and simply have one per-queue. This avoids the overhead of having to tear down and setup a timer for each command, so it will result in a lot less timer fiddling. Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: add support for IO CPU affinityJens Axboe2008-10-091-0/+12
| | | | | | | | | | | | | | | | | | This patch adds support for controlling the IO completion CPU of either all requests on a queue, or on a per-request basis. We export a sysfs variable (rq_affinity) which, if set, migrates completions of requests to the CPU that originally submitted it. A bio helper (bio_set_completion_cpu()) is also added, so that queuers can ask for completion on that specific CPU. In testing, this has been show to cut the system time by as much as 20-40% on synthetic workloads where CPU affinity is desired. This requires a little help from the architecture, so it'll only work as designed for archs that are using the new generic smp helper infrastructure. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: Block layer data integrity supportMartin K. Petersen2008-07-031-0/+8
| | | | | | | | | | | | | | | Some block devices support verifying the integrity of requests by way of checksums or other protection information that is submitted along with the I/O. This patch implements support for generating and verifying integrity metadata, as well as correctly merging, splitting and cloning bios and requests that have this extra information attached. See Documentation/block/data-integrity.txt for more information. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: rename and export rq_init()FUJITA Tomonori2008-04-291-1/+0
| | | | | | | | | | | | | | This rename rq_init() blk_rq_init() and export it. Any path that hands the request to the block layer needs to call it to initialize the request. This is a preparation for large command support, which needs to initialize the request in a proper way (that is, just doing a memset() will not work). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* proper prototype for blk_dev_init()Adrian Bunk2008-03-041-0/+2
| | | | | | | This patch adds a proper prototye for blk_dev_init() in block/blk.h Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: ll_rw_blk.c split, add blk-merge.cJens Axboe2008-01-291-2/+9
| | | | Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: continue ll_rw_blk.c splitupJens Axboe2008-01-291-0/+17
| | | | | | | Adds files for barrier handling, rq execution, io context handling, mapping data to requests, and queue settings. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: split tag and sysfs handling from blk-core.cJens Axboe2008-01-291-0/+29
Seperates the tag and sysfs handling from ll_rw_blk. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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