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* block: removed unused as_io_contextKirill Afonshin2010-01-111-27/+0
| | | | | | It isn't used anymore, since AS was deleted. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: Fix io_context leak after failure of clone with CLONE_IOLouis Rilling2009-12-041-2/+3
| | | | | | | | | | | | With CLONE_IO, parent's io_context->nr_tasks is incremented, but never decremented whenever copy_process() fails afterwards, which prevents exit_io_context() from calling IO schedulers exit functions. Give a task_struct to exit_io_context(), and call exit_io_context() instead of put_io_context() in copy_process() cleanup path. Signed-off-by: Louis Rilling <louis.rilling@kerlabs.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* blkio: Introduce blkio controller cgroup interfaceVivek Goyal2009-12-031-0/+4
| | | | | | | | | o This is basic implementation of blkio controller cgroup interface. This is the common interface visible to user space and should be used by different IO control policies as we implement those. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* cfq: calculate the seek_mean per cfq_queue not per cfq_io_contextJeff Moyer2009-10-261-5/+0
| | | | | | | | | | async cfq_queue's are already shared between processes within the same priority, and forthcoming patches will change the mapping of cic to sync cfq_queue from 1:1 to 1:N. So, calculate the seekiness of a process based on the cfq_queue instead of the cfq_io_context. Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* io context: fix ref countingLi Zefan2009-07-311-1/+1
| | | | | | | | | | Commit d9c7d394a8ebacb60097b192939ae9f15235225e ("block: prevent possible io_context->refcount overflow") mistakenly changed atomic_inc(&ioc->nr_tasks) to atomic_long_inc(&ioc->refcount). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: prevent possible io_context->refcount overflowNikanth Karthikesan2009-06-101-3/+3
| | | | | | | | | | | | | | | | | Currently io_context has an atomic_t(32-bit) as refcount. In the case of cfq, for each device against whcih a task does I/O, a reference to the io_context would be taken. And when there are multiple process sharing io_contexts(CLONE_IO) would also have a reference to the same io_context. Theoretically the possible maximum number of processes sharing the same io_context + the number of disks/cfq_data referring to the same io_context can overflow the 32-bit counter on a very high-end machine. Even though it is an improbable case, let us make it atomic_long_t. Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: blkdev.h cleanup, move iocontext stuff to iocontext.hJens Axboe2008-07-031-0/+18
| | | | Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* io context: increment task attachment count in ioc_task_link()Jens Axboe2008-04-151-1/+3
| | | | | | Thanks to Nikanth Karthikesan <knikanth@suse.de> for reporting this. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* cfq-iosched: fix rcu freeing of cfq io contextsFabio Checconi2008-04-021-0/+3
| | | | | | | | | | SLAB_DESTROY_BY_RCU is not a direct substitute for normal call_rcu() freeing, since it'll page freeing but NOT object freeing. So change cfq to do the freeing on its own. Signed-off-by: Fabio Checconi <fabio@gandalf.sssup.it> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* cfq-iosched: add hlist for browsing parallel to the radix treeJens Axboe2008-02-191-0/+2
| | | | | | | | | | | It's cumbersome to browse a radix tree from start to finish, especially since we modify keys when a process exits. So add a hlist for the single purpose of browsing over all known cfq_io_contexts, used for exit, io prio change, etc. This fixes http://bugzilla.kernel.org/show_bug.cgi?id=9948 Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: cfq: make the io contect sharing locklessJens Axboe2008-01-281-2/+4
| | | | | | | | | | | | | | | | | The io context sharing introduced a per-ioc spinlock, that would protect the cfq io context lookup. That is a regression from the original, since we never needed any locking there because the ioc/cic were process private. The cic lookup is changed from an rbtree construct to a radix tree, which we can then use RCU to make the reader side lockless. That is the performance critical path, modifying the radix tree is only done on process creation (when that process first does IO, actually) and on process exit (if that process has done IO). As it so happens, radix trees are also much faster for this type of lookup where the key is a pointer. It's a very sparse tree. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* io context sharing: preliminary supportJens Axboe2008-01-281-4/+18
| | | | | | | Detach task state from ioc, instead keep track of how many processes are accessing the ioc. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* ioprio: move io priority from task_struct to io_contextJens Axboe2008-01-281-0/+79
This is where it belongs and then it doesn't take up space for a process that doesn't do IO. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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