aboutsummaryrefslogtreecommitdiffstats
Commit message (Collapse)AuthorAge
* Merge branch 'master' into upstreamJeff Garzik2006-09-30
|\
| * [PATCH] SCSI: fix request flag-related build breakageJeff Garzik2006-09-30
| | | | | | | | | | | | | | | | | | The ->flags in struct request was split into two variables, in a recent changeset. The merge of this change forgot to update SCSI's libsas, probably because libsas was a very recent merge. Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * [PATCH] scsi: device_reprobe() can failAndrew Morton2006-09-30
| | | | | | | | | | | | | | | | | | | | device_reprobe() should return an error code. When it does so, scsi_device_reprobe() should propagate it back. Acked-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * Merge branch 'block' of git://brick.kernel.dk/data/git/linux-2.6-blockLinus Torvalds2006-09-30
| |\ | | | | | | | | | | | | * 'block' of git://brick.kernel.dk/data/git/linux-2.6-block: [PATCH] Only enable CONFIG_BLOCK option for embedded
| | * [PATCH] Only enable CONFIG_BLOCK option for embeddedJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | It's too easy for people to shoot themselves in the foot, and it only makes sense for embedded folks anyway. Signed-off-by: Jens Axboe <axboe@kernel.dk>
| * | Merge branch 'block' of git://brick.kernel.dk/data/git/linux-2.6-blockLinus Torvalds2006-09-30
| |\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'block' of git://brick.kernel.dk/data/git/linux-2.6-block: (67 commits) [PATCH] blk_queue_start_tag() shared map race fix [PATCH] Update axboe@suse.de email address [PATCH] fix creating zero sized bio mempools in low memory system [PATCH] CONFIG_BLOCK: blk_congestion_wait() fix [PATCH] CONFIG_BLOCK internal.h cleanups [PATCH] BLOCK: Make USB storage depend on SCSI rather than selecting it [try #6] [PATCH] BLOCK: Make it possible to disable the block layer [try #6] [PATCH] BLOCK: Remove no-longer necessary linux/buffer_head.h inclusions [try #6] [PATCH] BLOCK: Remove no-longer necessary linux/mpage.h inclusions [try #6] [PATCH] BLOCK: Move the msdos device ioctl compat stuff to the msdos driver [try #6] [PATCH] BLOCK: Move the Ext3 device ioctl compat stuff to the Ext3 driver [try #6] [PATCH] BLOCK: Move the Ext2 device ioctl compat stuff to the Ext2 driver [try #6] [PATCH] BLOCK: Move the ReiserFS device ioctl compat stuff to the ReiserFS driver [try #6] [PATCH] BLOCK: Move common FS-specific ioctls to linux/fs.h [try #6] [PATCH] BLOCK: Move the loop device ioctl compat stuff to the loop driver [try #6] [PATCH] BLOCK: Move __invalidate_device() to block_dev.c [try #6] [PATCH] BLOCK: Dissociate generic_writepages() from mpage stuff [try #6] [PATCH] BLOCK: Remove dependence on existence of blockdev_superblock [try #6] [PATCH] BLOCK: Move extern declarations out of fs/*.c into header files [try #6] [PATCH] BLOCK: Don't call block_sync_page() from AFS [try #6] ...
| | * [PATCH] blk_queue_start_tag() shared map race fixJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we share the tag map between two or more queues, then we cannot use __set_bit() to set the bit. In fact we need to make sure we atomically acquire this tag, so loop using test_and_set_bit() to protect from that. Noticed by Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] Update axboe@suse.de email addressJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | As people often look for the copyright in files to see who to mail, update the link to a neutral one. Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] fix creating zero sized bio mempools in low memory systemMilan Broz2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In the very low memory systems is in the init_bio call scale parameter set to zero and it leads to creating zero sized mempool. This patch prevents pool_entries parameter become zero, so the created pool have at least 1 entry. Mempool with 0 entries lead to incorrect behaviour of mempool_free. (Alloc requests are not waken up and system stalls in mempool_alloc->ioschedule). Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] CONFIG_BLOCK: blk_congestion_wait() fixAndrew Morton2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Don't just do nothing: it'll cause busywaits all over writeback and page reclaim. For now, take a fixed-length nap. Will improve when NFS starts waking up throttled processes. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] CONFIG_BLOCK internal.h cleanupsAndrew Morton2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | - forward declare struct superblock - use inlines, not macros Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Make USB storage depend on SCSI rather than selecting it [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | This makes CONFIG_USB_STORAGE depend on CONFIG_SCSI rather than selecting it, as selecting it makes CONFIG_USB_STORAGE override the dependencies of SCSI, causing it to turn on even if they aren't all met. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Make it possible to disable the block layer [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make it possible to disable the block layer. Not all embedded devices require it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require the block layer to be present. This patch does the following: (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev support. (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls an item that uses the block layer. This includes: (*) Block I/O tracing. (*) Disk partition code. (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS. (*) The SCSI layer. As far as I can tell, even SCSI chardevs use the block layer to do scheduling. Some drivers that use SCSI facilities - such as USB storage - end up disabled indirectly from this. (*) Various block-based device drivers, such as IDE and the old CDROM drivers. (*) MTD blockdev handling and FTL. (*) JFFS - which uses set_bdev_super(), something it could avoid doing by taking a leaf out of JFFS2's book. (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is, however, still used in places, and so is still available. (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and parts of linux/fs.h. (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK. (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK. (*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK is not enabled. (*) fs/no-block.c is created to hold out-of-line stubs and things that are required when CONFIG_BLOCK is not set: (*) Default blockdev file operations (to give error ENODEV on opening). (*) Makes some /proc changes: (*) /proc/devices does not list any blockdevs. (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK. (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK. (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if given command other than Q_SYNC or if a special device is specified. (*) In init/do_mounts.c, no reference is made to the blockdev routines if CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2. (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return error ENOSYS by way of cond_syscall if so). (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if CONFIG_BLOCK is not set, since they can't then happen. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Remove no-longer necessary linux/buffer_head.h inclusions ↵David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [try #6] Remove inclusions of linux/buffer_head.h that are no longer necessary due to the transfer of a number of things out of there. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Remove no-longer necessary linux/mpage.h inclusions [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | Remove inclusions of linux/mpage.h that are no longer necessary due to the transfer of generic_writepages(). Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move the msdos device ioctl compat stuff to the msdos driver ↵David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [try #6] Move the msdos device ioctl compat stuff from fs/compat_ioctl.c to the msdos driver so that the msdos header file doesn't need to be included. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move the Ext3 device ioctl compat stuff to the Ext3 driver ↵David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [try #6] Move the Ext3 device ioctl compat stuff from fs/compat_ioctl.c to the Ext3 driver so that the Ext3 header file doesn't need to be included. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move the Ext2 device ioctl compat stuff to the Ext2 driver ↵David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [try #6] Move the Ext2 device ioctl compat stuff from fs/compat_ioctl.c to the Ext2 driver so that the Ext2 header file doesn't need to be included. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move the ReiserFS device ioctl compat stuff to the ReiserFS ↵David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | driver [try #6] Move the ReiserFS device ioctl compat stuff from fs/compat_ioctl.c to the ReiserFS driver so that the ReiserFS header file doesn't need to be included. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move common FS-specific ioctls to linux/fs.h [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move common FS-specific ioctls from linux/ext2_fs.h to linux/fs.h as FS_IOC_* and FS_IOC32_* and have the users of them use those as a base. Also move the GETFLAGS/SETFLAGS flags to linux/fs.h as FS_*_FL macros, and then have the other users use them as a base. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move the loop device ioctl compat stuff to the loop driver ↵David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [try #6] Move the loop device ioctl compat stuff from fs/compat_ioctl.c to the loop driver so that the loop header file doesn't need to be included. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move __invalidate_device() to block_dev.c [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | Move __invalidate_device() from fs/inode.c to fs/block_dev.c so that it can more easily be disabled when the block layer is disabled. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Dissociate generic_writepages() from mpage stuff [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dissociate the generic_writepages() function from the mpage stuff, moving its declaration to linux/mm.h and actually emitting a full implementation into mm/page-writeback.c. The implementation is a partial duplicate of mpage_writepages() with all BIO references removed. It is used by NFS to do writeback. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Remove dependence on existence of blockdev_superblock [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | Move blockdev_superblock extern declaration from fs/fs-writeback.c to a headerfile and remove the dependence on it by wrapping it in a macro. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move extern declarations out of fs/*.c into header files [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Create a new header file, fs/internal.h, for common definitions local to the sources in the fs/ directory. Move extern definitions that should be in header files from fs/*.c to fs/internal.h or other main header files where they span directories. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Don't call block_sync_page() from AFS [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | The AFS filesystem no longer needs to override its sync_page() op. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Separate the bounce buffering code from the highmem code [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move the bounce buffer code from mm/highmem.c to mm/bounce.c so that it can be more easily disabled when the block layer is disabled. !!!NOTE!!! There may be a bug in this code: Should init_emergency_pool() be contingent on CONFIG_HIGHMEM? Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Stop fallback_migrate_page() from using page_has_buffers() ↵David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [try #6] Stop fallback_migrate_page() from using page_has_buffers() since that might not be available. Use PagePrivate() instead since that's more general. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Remove duplicate declaration of exit_io_context() [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | Remove the duplicate declaration of exit_io_context() from linux/sched.h. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] BLOCK: Move functions out of buffer code [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move some functions out of the buffering code that aren't strictly buffering specific. This is a precursor to being able to disable the block layer. (*) Moved some stuff out of fs/buffer.c: (*) The file sync and general sync stuff moved to fs/sync.c. (*) The superblock sync stuff moved to fs/super.c. (*) do_invalidatepage() moved to mm/truncate.c. (*) try_to_release_page() moved to mm/filemap.c. (*) Moved some related declarations between header files: (*) declarations for do_invalidatepage() and try_to_release_page() moved to linux/mm.h. (*) __set_page_dirty_buffers() moved to linux/buffer_head.h. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] blktrace: cleanup using on_each_cpuMartin Peschke2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | This patch kills a few lines of code in blktrace by making use of on_each_cpu(). Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] Don't need to disable interrupts for tasklist_lockOleg Nesterov2006-09-30
| | | | | | | | | | | | | | | Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] exit_io_context: don't disable irqsOleg Nesterov2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't need to disable irqs to clear current->io_context, it is protected by ->alloc_lock. Even IF it was possible to submit I/O from IRQ on behalf of current this irq_disable() can't help: current_io_context() will re-instantiate ->io_context after irq_enable(). We don't need task_lock() or local_irq_disable() to clear ioc->task. This can't prevent other CPUs from playing with our io_context anyway. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] SCSI: scsi_done_q is unusedJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | It is a leftover from before the softirq completion was migrated to the block layer. Signed-off-by: Jens Axboe <axboe@kernel.dk>
| | * [PATCH] blktrace: support for logging metadata readsJens Axboe2006-09-30
| | | | | | | | | | | | Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] cfq-iosched: use metadata read flagJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | Give meta data reads preference over regular reads, as the process often needs to get that out of the way to do the io it was actually interested in. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] ext3: make meta data reads use READ_METAJens Axboe2006-09-30
| | | | | | | | | | | | Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] Allow file systems to differentiate between data and meta readsJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | We can use this information for making more intelligent priority decisions, and it will also be useful for blktrace. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] ll_rw_blk: allow more flexibility for read_ahead_kb storeJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It can make sense to set read-ahead larger than a single request. We should not be enforcing such policy on the user. Additionally, using the BLKRASET ioctl doesn't impose such a restriction. So additionally we now expose identical behaviour through the two. Issue also reported by Anton <cbou@mail.ru> Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] cfq-iosched: improve queue preemptionJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | Don't touch the current queues, just make sure that the wanted queue is selected next. Simplifies the logic. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] Add blk_start_queueing() helperJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | CFQ implements this on its own now, but it's really block layer knowledge. Tells a device queue to start dispatching requests to the driver, taking care to unplug if needed. Also fixes the issue where as/cfq will invoke a stopped queue, which we really don't want. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] cfq-iosched: kill the empty_listJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | No point in having a place holder list just for empty queues, so remove it. It's not used for anything other than to keep ->cfq_list busy. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] cfq-iosched: Kill O(N) runtime of cfq_resort_rr_list()Jens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | Currently it scales with number of processes in that priority group, which is potentially not very nice as it's called quite often. Basically we always need to do tail inserts, except for the case of a new process. So just mark/detect a queue as such. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] Make sure all block/io scheduler setups are node awareJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | Some were kmalloc_node(), some were still kmalloc(). Change them all to kmalloc_node(). Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] Kill various deprecated/unused block layer defines/functionsJens Axboe2006-09-30
| | | | | | | | | | | | Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] Audit block layer inlinesJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | Kill a few inlines that bring in too much code to more than one location Shrinks kernel text by about 300 bytes on 32-bit x86. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] cfq-iosched: use new io context counting mechanismJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | It's ok if the read path is a lot more costly, as long as inc/dec is really cheap. The inc/dec will happen for each created/freed io context, while the reading only happens when a disk queue exits. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] as-iosched: use new io context counting mechanismJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | It's ok if the read path is a lot more costly, as long as inc/dec is really cheap. The inc/dec will happen for each created/freed io context, while the reading only happens when a disk queue exits. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] elevator: define ioc counting mechanismJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | None of the in-kernel primitives for handling "atomic" counting seem to be a good fit. We need something that is essentially free for incrementing/decrementing, while the read side may be more expensive as we only ever need to do that when a device is removed from the kernel. Use a per-cpu variable for maintaining a per-cpu ioc count and define a reading mechanism that just sums up the values. Signed-off-by: Jens Axboe <axboe@suse.de>
| | * [PATCH] cfq-iosched: kill cfq_exit_lockJens Axboe2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cfq_exit_lock is protecting two things now: - The per-ioc rbtree of cfq_io_contexts - The per-cfqd linked list of cfq_io_contexts The per-cfqd linked list can be protected by the queue lock, as it is (by definition) per cfqd as the queue lock is. The per-ioc rbtree is mainly used and updated by the process itself only. The only outside use is the io priority changing. If we move the priority changing to not browsing the rbtree, we can remove any locking from the rbtree updates and lookup completely. Let the sys_ioprio syscall just mark processes as having the iopriority changed and lazily update the private cfq io contexts the next time io is queued, and we can remove this locking as well. Signed-off-by: Jens Axboe <axboe@suse.de>
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-26 17:53:55 -0500