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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-25 10:33:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-25 10:33:36 -0700 |
| commit | 096a705bbc080a4041636d07514560da8d78acbe (patch) | |
| tree | 38c3c01225709ffa53419083ea6332f8a72610de /Documentation | |
| parent | fea80311a939a746533a6d7e7c3183729d6a3faf (diff) | |
| parent | 5757a6d76cdf6dda2a492c09b985c015e86779b1 (diff) | |
Merge branch 'for-3.1/core' of git://git.kernel.dk/linux-block
* 'for-3.1/core' of git://git.kernel.dk/linux-block: (24 commits)
block: strict rq_affinity
backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu
block: fix patch import error in max_discard_sectors check
block: reorder request_queue to remove 64 bit alignment padding
CFQ: add think time check for group
CFQ: add think time check for service tree
CFQ: move think time check variables to a separate struct
fixlet: Remove fs_excl from struct task.
cfq: Remove special treatment for metadata rqs.
block: document blk_plug list access
block: avoid building too big plug list
compat_ioctl: fix make headers_check regression
block: eliminate potential for infinite loop in blkdev_issue_discard
compat_ioctl: fix warning caused by qemu
block: flush MEDIA_CHANGE from drivers on close(2)
blk-throttle: Make total_nr_queued unsigned
block: Add __attribute__((format(printf...) and fix fallout
fs/partitions/check.c: make local symbols static
block:remove some spare spaces in genhd.c
block:fix the comment error in blkdev.h
...
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index f65274081c8..d8147b336c3 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt @@ -45,9 +45,13 @@ device. rq_affinity (RW) ---------------- -If this option is enabled, the block layer will migrate request completions -to the CPU that originally submitted the request. For some workloads -this provides a significant reduction in CPU cycles due to caching effects. +If this option is '1', the block layer will migrate request completions to the +cpu "group" that originally submitted the request. For some workloads this +provides a significant reduction in CPU cycles due to caching effects. + +For storage configurations that need to maximize distribution of completion +processing setting this option to '2' forces the completion to run on the +requesting cpu (bypassing the "group" aggregation logic). scheduler (RW) -------------- |