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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-08-01 09:02:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-08-01 09:02:41 -0700 |
| commit | 8cf1a3fce0b95050b63d451c9d561da0da2aa4d6 (patch) | |
| tree | 0dc7f93474c3be601a5893900db1418dfd60ba5d /Documentation | |
| parent | fcff06c438b60f415af5983efe92811d6aa02ad1 (diff) | |
| parent | 80799fbb7d10c30df78015b3fa21f7ffcfc0eb2c (diff) | |
Merge branch 'for-3.6/core' of git://git.kernel.dk/linux-block
Pull core block IO bits from Jens Axboe:
"The most complicated part if this is the request allocation rework by
Tejun, which has been queued up for a long time and has been in
for-next ditto as well.
There are a few commits from yesterday and today, mostly trivial and
obvious fixes. So I'm pretty confident that it is sound. It's also
smaller than usual."
* 'for-3.6/core' of git://git.kernel.dk/linux-block:
block: remove dead func declaration
block: add partition resize function to blkpg ioctl
block: uninitialized ioc->nr_tasks triggers WARN_ON
block: do not artificially constrain max_sectors for stacking drivers
blkcg: implement per-blkg request allocation
block: prepare for multiple request_lists
block: add q->nr_rqs[] and move q->rq.elvpriv to q->nr_rqs_elvpriv
blkcg: inline bio_blkcg() and friends
block: allocate io_context upfront
block: refactor get_request[_wait]()
block: drop custom queue draining used by scsi_transport_{iscsi|fc}
mempool: add @gfp_mask to mempool_create_node()
blkcg: make root blkcg allocation use %GFP_KERNEL
blkcg: __blkg_lookup_create() doesn't need radix preload
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index d8147b336c3..6518a55273e 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt @@ -38,6 +38,13 @@ read or write requests. Note that the total allocated number may be twice this amount, since it applies only to reads or writes (not the accumulated sum). +To avoid priority inversion through request starvation, a request +queue maintains a separate request pool per each cgroup when +CONFIG_BLK_CGROUP is enabled, and this parameter applies to each such +per-block-cgroup request pool. IOW, if there are N block cgroups, +each request queue may have upto N request pools, each independently +regulated by nr_requests. + read_ahead_kb (RW) ------------------ Maximum number of kilobytes to read-ahead for filesystems on this block |