linux/Documentation/block, branch v3.1

cfq-iosched: Add documentation about idling

2011-08-05T07:42:20Z

There are always questions about why CFQ is idling on various conditions. Recent ones is Christoph asking again why to idle on REQ_NOIDLE. His assertion is that XFS is relying more and more on workqueues and is concerned that CFQ idling on IO from every workqueue will impact XFS badly. So he suggested that I add some more documentation about CFQ idling and that can provide more clarity on the topic and also gives an opprotunity to poke a hole in theory and lead to improvements. So here is my attempt at that. Any comments are welcome. Signed-off-by: Vivek Goyal Signed-off-by: Jens Axboe

block: strict rq_affinity

2011-07-23T18:44:25Z

Some systems benefit from completions always being steered to the strict requester cpu rather than the looser "per-socket" steering that blk_cpu_to_group() attempts by default. This is because the first CPU in the group mask ends up being completely overloaded with work, while the others (including the original submitter) has power left to spare. Allow the strict mode to be set by writing '2' to the sysfs control file. This is identical to the scheme used for the nomerges file, where '2' is a more aggressive setting than just being turned on. echo 2 > /sys/block//queue/rq_affinity Cc: Christoph Hellwig Cc: Roland Dreier Tested-by: Dave Jiang Signed-off-by: Dan Williams Signed-off-by: Jens Axboe

Fix common misspellings

2011-03-31T14:26:23Z

Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi

block: remove per-queue plugging

2011-03-10T07:52:07Z

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

Documentation: remove anticipatory scheduler info

2010-11-11T11:09:59Z

Remove anticipatory block I/O scheduler info from Documentation/ since the code has been deleted. Signed-off-by: Randy Dunlap Reported-by: "Robert P. J. Day" Cc: Jens Axboe Signed-off-by: Jens Axboe

Merge branch 'v2.6.36-rc8' into for-2.6.37/barrier

2010-10-19T07:13:04Z

Conflicts: block/blk-core.c drivers/block/loop.c mm/swapfile.c Signed-off-by: Jens Axboe

block: update documentation for REQ_FLUSH / REQ_FUA

2010-09-10T10:35:37Z

Signed-off-by: Christoph Hellwig Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

cfq-iosched: Documentation help for new tunables

2010-08-23T10:25:29Z

Some documentation to provide help with tunables. Signed-off-by: Vivek Goyal Acked-by: Jeff Moyer Signed-off-by: Jens Axboe

nick piggin: change email address

2010-08-05T15:45:20Z

Signed-off-by: Nick Piggin Signed-off-by: Linus Torvalds

Documentation: fix block/biodoc.txt dma mapping description

2010-03-08T08:11:07Z

- It looks incorrect to use blk_rq_map_sg with pci_map_page here about DMA mappings. dma_map_sg? - better to use dma_map_page instead of pci_map_page. http://marc.info/?l=linux-kernel&m=126596737604808&w=2 Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe