x86: force enable HPET on (some?) ICH9 boards

[linux-2.6-omap-h63xx.git] / Documentation / cgroups.txt

diff --git a/Documentation/cgroups.txt b/Documentation/cgroups.txt
index 4717887fd75d2f2b758616c1aaef473f20d2f667..98a26f81fa75062b104edb796f3b9a0449f6f28c 100644 (file)
--- a/Documentation/cgroups.txt
+++ b/Documentation/cgroups.txt
@@ -176,7 +176,9 @@ Control Groups extends the kernel as follows:
    subsystem state is something that's expected to happen frequently
    and in performance-critical code, whereas operations that require a
    task's actual cgroup assignments (in particular, moving between
-   cgroups) are less common.
+   cgroups) are less common. A linked list runs through the cg_list
+   field of each task_struct using the css_set, anchored at
+   css_set->tasks.
 
  - A cgroup hierarchy filesystem can be mounted  for browsing and
    manipulation from user space.
@@ -252,6 +254,16 @@ linear search to locate an appropriate existing css_set, so isn't
 very efficient. A future version will use a hash table for better
 performance.
 
+To allow access from a cgroup to the css_sets (and hence tasks)
+that comprise it, a set of cg_cgroup_link objects form a lattice;
+each cg_cgroup_link is linked into a list of cg_cgroup_links for
+a single cgroup on its cont_link_list field, and a list of
+cg_cgroup_links for a single css_set on its cg_link_list.
+
+Thus the set of tasks in a cgroup can be listed by iterating over
+each css_set that references the cgroup, and sub-iterating over
+each css_set's task set.
+
 The use of a Linux virtual file system (vfs) to represent the
 cgroup hierarchy provides for a familiar permission and name space
 for cgroups, with a minimum of additional kernel code.
@@ -504,6 +516,13 @@ include/linux/cgroup.h for details).  Note that although this
 method can return an error code, the error code is currently not
 always handled well.
 
+void post_clone(struct cgroup_subsys *ss, struct cgroup *cont)
+
+Called at the end of cgroup_clone() to do any paramater
+initialization which might be required before a task could attach.  For
+example in cpusets, no task may attach before 'cpus' and 'mems' are set
+up.
+
 void bind(struct cgroup_subsys *ss, struct cgroup *root)
 LL=callback_mutex