Add documentation for the soft limit feature.
Changelog v2 (Thanks to the review by Randy Dunlap)
1. Change several misuses of it's to its
2. Fix spelling errors and punctuation
Signed-off-by: Balbir Singh <[EMAIL PROTECTED]>
---
Documentation/controllers/memory.txt | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff -puN
Documentation/controllers/memory.txt~memory-controller-add-soft-limit-documentation
Documentation/controllers/memory.txt
---
linux-2.6.25-rc2/Documentation/controllers/memory.txt~memory-controller-add-soft-limit-documentation
2008-02-19 12:31:53.000000000 +0530
+++ linux-2.6.25-rc2-balbir/Documentation/controllers/memory.txt
2008-02-19 12:31:53.000000000 +0530
@@ -201,6 +201,22 @@ The memory.force_empty gives an interfac
will drop all charges in cgroup. Currently, this is maintained for test.
+The file memory.soft_limit_in_bytes allows users to set soft limits. A soft
+limit is set in a manner similar to limit. The limit feature described
+earlier is a hard limit. A group can never exceed its hard limit. A soft
+limit on the other hand can be exceeded. A group will be shrunk back
+to its soft limit, when there is memory pressure/contention.
+
+Ideally the soft limit should always be set to a value smaller than the
+hard limit. However, the code does not force the user to do so. The soft
+limit can be greater than the hard limit; then the soft limit has
+no meaning in that setup, since the group will always be restrained to its
+hard limit.
+
+Example setting of soft limit
+
+# echo -n 100M > memory.soft_limit_in_bytes
+
4. Testing
Balbir posted lmbench, AIM9, LTP and vmmstress results [10] and [11].
@@ -221,7 +237,7 @@ some of the pages cached in the cgroup (
4.2 Task migration
-When a task migrates from one cgroup to another, it's charge is not
+When a task migrates from one cgroup to another, its charge is not
carried forward. The pages allocated from the original cgroup still
remain charged to it, the charge is dropped when the page is freed or
reclaimed.
_
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
