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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2011-01-14 15:04:21 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-14 07:52:02 -0800
commit11ff26c884ec957bed87b49e3a38908f37d0d3e4 (patch)
tree056837fa144e1f8d1bd982a845cbe426626389ad /Documentation
parent52cfd503ad7176d23a5dd7af3981744feb60622f (diff)
revert documentaion update for memcg's dirty ratio.
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 <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Greg Thelen <gthelen@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/cgroups/memory.txt74
1 files changed, 0 insertions, 74 deletions
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index bac328c232f..7781857dc94 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -385,10 +385,6 @@ mapped_file - # of bytes of mapped file (includes tmpfs/shmem)
pgpgin - # of pages paged in (equivalent to # of charging events).
pgpgout - # of pages paged out (equivalent to # of uncharging events).
swap - # of bytes of swap usage
-dirty - # of bytes that are waiting to get written back to the disk.
-writeback - # of bytes that are actively being written back to the disk.
-nfs_unstable - # of bytes sent to the NFS server, but not yet committed to
- the actual storage.
inactive_anon - # of bytes of anonymous memory and swap cache memory on
LRU list.
active_anon - # of bytes of anonymous and swap cache memory on active
@@ -410,9 +406,6 @@ total_mapped_file - sum of all children's "cache"
total_pgpgin - sum of all children's "pgpgin"
total_pgpgout - sum of all children's "pgpgout"
total_swap - sum of all children's "swap"
-total_dirty - sum of all children's "dirty"
-total_writeback - sum of all children's "writeback"
-total_nfs_unstable - sum of all children's "nfs_unstable"
total_inactive_anon - sum of all children's "inactive_anon"
total_active_anon - sum of all children's "active_anon"
total_inactive_file - sum of all children's "inactive_file"
@@ -460,73 +453,6 @@ memory under it will be reclaimed.
You can reset failcnt by writing 0 to failcnt file.
# echo 0 > .../memory.failcnt
-5.5 dirty memory
-
-Control the maximum amount of dirty pages a cgroup can have at any given time.
-
-Limiting dirty memory is like fixing the max amount of dirty (hard to reclaim)
-page cache used by a cgroup. So, in case of multiple cgroup writers, they will
-not be able to consume more than their designated share of dirty pages and will
-be forced to perform write-out if they cross that limit.
-
-The interface is equivalent to the procfs interface: /proc/sys/vm/dirty_*. It
-is possible to configure a limit to trigger both a direct writeback or a
-background writeback performed by per-bdi flusher threads. The root cgroup
-memory.dirty_* control files are read-only and match the contents of
-the /proc/sys/vm/dirty_* files.
-
-Per-cgroup dirty limits can be set using the following files in the cgroupfs:
-
-- memory.dirty_ratio: the amount of dirty memory (expressed as a percentage of
- cgroup memory) at which a process generating dirty pages will itself start
- writing out dirty data.
-
-- memory.dirty_limit_in_bytes: the amount of dirty memory (expressed in bytes)
- in the cgroup at which a process generating dirty pages will start itself
- writing out dirty data. Suffix (k, K, m, M, g, or G) can be used to indicate
- that value is kilo, mega or gigabytes.
-
- Note: memory.dirty_limit_in_bytes is the counterpart of memory.dirty_ratio.
- Only one of them may be specified at a time. When one is written it is
- immediately taken into account to evaluate the dirty memory limits and the
- other appears as 0 when read.
-
-- memory.dirty_background_ratio: the amount of dirty memory of the cgroup
- (expressed as a percentage of cgroup memory) at which background writeback
- kernel threads will start writing out dirty data.
-
-- memory.dirty_background_limit_in_bytes: the amount of dirty memory (expressed
- in bytes) in the cgroup at which background writeback kernel threads will
- start writing out dirty data. Suffix (k, K, m, M, g, or G) can be used to
- indicate that value is kilo, mega or gigabytes.
-
- Note: memory.dirty_background_limit_in_bytes is the counterpart of
- memory.dirty_background_ratio. Only one of them may be specified at a time.
- When one is written it is immediately taken into account to evaluate the dirty
- memory limits and the other appears as 0 when read.
-
-A cgroup may contain more dirty memory than its dirty limit. This is possible
-because of the principle that the first cgroup to touch a page is charged for
-it. Subsequent page counting events (dirty, writeback, nfs_unstable) are also
-counted to the originally charged cgroup.
-
-Example: If page is allocated by a cgroup A task, then the page is charged to
-cgroup A. If the page is later dirtied by a task in cgroup B, then the cgroup A
-dirty count will be incremented. If cgroup A is over its dirty limit but cgroup
-B is not, then dirtying a cgroup A page from a cgroup B task may push cgroup A
-over its dirty limit without throttling the dirtying cgroup B task.
-
-When use_hierarchy=0, each cgroup has dirty memory usage and limits.
-System-wide dirty limits are also consulted. Dirty memory consumption is
-checked against both system-wide and per-cgroup dirty limits.
-
-The current implementation does not enforce per-cgroup dirty limits when
-use_hierarchy=1. System-wide dirty limits are used for processes in such
-cgroups. Attempts to read memory.dirty_* files return the system-wide
-values. Writes to the memory.dirty_* files return error. An enhanced
-implementation is needed to check the chain of parents to ensure that no
-dirty limit is exceeded.
-
6. Hierarchy support
The memory controller supports a deep hierarchy and hierarchical accounting.