linux/Documentation/cgroups, branch v2.6.39

memcg: update documentation to describe usage_in_bytes

2011-04-28T18:28:21Z

Since 569b846d ("memcg: coalesce uncharge during unmap/truncate"), we do batched (delayed) uncharge at truncation/unmap. And since cdec2e42(memcg: coalesce charging via percpu storage), we have percpu cache for res_counter. These changes improved performance of memory cgroup very much, but made res_counter->usage usually have a bigger value than the actual value of memory usage. So, *.usage_in_bytes, which show res_counter->usage, are not desirable for precise values of memory(and swap) usage anymore. Instead of removing these files completely(because we cannot know res_counter->usage without them), this patch updates the meaning of those files. Signed-off-by: Daisuke Nishimura Acked-by: KAMEZAWA Hiroyuki Acked-by: Michal Hocko Cc: Balbir Singh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Documentation: update cgroups info user groups names

2011-04-05T00:51:47Z

Update suitable words to explain / understand cgroups contents. Signed-off-by: Geunsik Lim Cc: Paul Menage Signed-off-by: Randy Dunlap Signed-off-by: Linus Torvalds

Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block

2011-03-24T17:16:26Z

* 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block: (65 commits) Documentation/iostats.txt: bit-size reference etc. cfq-iosched: removing unnecessary think time checking cfq-iosched: Don't clear queue stats when preempt. blk-throttle: Reset group slice when limits are changed blk-cgroup: Only give unaccounted_time under debug cfq-iosched: Don't set active queue in preempt block: fix non-atomic access to genhd inflight structures block: attempt to merge with existing requests on plug flush block: NULL dereference on error path in __blkdev_get() cfq-iosched: Don't update group weights when on service tree fs: assign sb->s_bdi to default_backing_dev_info if the bdi is going away block: Require subsystems to explicitly allocate bio_set integrity mempool jbd2: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging jbd: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging fs: make fsync_buffers_list() plug mm: make generic_writepages() use plugging blk-cgroup: Add unaccounted time to timeslice_used. block: fixup plugging stubs for !CONFIG_BLOCK block: remove obsolete comments for blkdev_issue_zeroout. blktrace: Use rq->cmd_flags directly in blk_add_trace_rq. ... Fix up conflicts in fs/{aio.c,super.c}

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2011-03-18T17:37:40Z

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (47 commits) doc: CONFIG_UNEVICTABLE_LRU doesn't exist anymore Update cpuset info & webiste for cgroups dcdbas: force SMI to happen when expected arch/arm/Kconfig: remove one to many l's in the word. asm-generic/user.h: Fix spelling in comment drm: fix printk typo 'sracth' Remove one to many n's in a word Documentation/filesystems/romfs.txt: fixing link to genromfs drivers:scsi Change printk typo initate -> initiate serial, pch uart: Remove duplicate inclusion of linux/pci.h header fs/eventpoll.c: fix spelling mm: Fix out-of-date comments which refers non-existent functions drm: Fix printk typo 'failled' coh901318.c: Change initate to initiate. mbox-db5500.c Change initate to initiate. edac: correct i82975x error-info reported edac: correct i82975x mci initialisation edac: correct commented info fs: update comments to point correct document target: remove duplicate include of target/target_core_device.h from drivers/target/target_core_hba.c ... Trivial conflict in fs/eventpoll.c (spelling vs addition)

Documentation: update cgroup pid and cpuset information

2011-03-16T17:47:04Z

The cgroup documentation does not specify how a process can be removed from a particular group. This patch adds a note at the end of the simple example about how this is done. Also, some cgroups (like cpusets) require user input before a new group can be used. This is noted in the patch as well. Signed-off-by: Eric B Munson Acked-by: Paul Menage Signed-off-by: Randy Dunlap Signed-off-by: Linus Torvalds

Update cpuset info & webiste for cgroups

2011-03-08T22:12:39Z

cpuset related websited is changed. and, update list of cpuset using cgroup(controller group). Signed-off-by: Geunsik Lim Acked-by: Paul Menage Signed-off-by: Jiri Kosina

blk-cgroup: Lower minimum weight from 100 to 10.

2011-03-08T18:45:00Z

We've found that we still get good, useful isolation at weights this low. I'd like to adjust the minimum so that any other changes can take these values into account. Signed-off-by: Justin TerAvest Acked-by: Vivek Goyal Signed-off-by: Jens Axboe

cfq-iosched: Always provide group isolation.

2011-03-01T20:05:08Z

Effectively, make group_isolation=1 the default and remove the tunable. The setting group_isolation=0 was because by default we idle on sync-noidle tree and on fast devices, this can be very harmful for throughput. However, this problem can also be addressed by tuning slice_idle and possibly group_idle on faster storage devices. This change simplifies the CFQ code by removing the feature entirely. Signed-off-by: Justin TerAvest Acked-by: Vivek Goyal Signed-off-by: Jens Axboe

memcg: clarify use_hierarchy documentation

2011-02-17T08:17:21Z

The memcg code does not allow changing memory.use_hierarchy if the parent cgroup has enabled use_hierarchy. Update documentation to match the code. Signed-off-by: Greg Thelen Acked-by: KAMEZAWA Hiroyuki Signed-off-by: Jiri Kosina

revert documentaion update for memcg's dirty ratio.

2011-01-14T15:52:02Z

Subjct: Revert memory cgroup dirty_ratio Documentation. The commit ece72400c2a27a3d726cb0854449f991d9fcd2da adds documentation for memcg's dirty ratio. But the function is not implemented yet. Remove the documentation for avoiding confusing users. Signed-off-by: KAMEZAWA Hiroyuki Reviewed-by: Greg Thelen Signed-off-by: Linus Torvalds