From: Paul Jackson <pj@xxxxxxx>
The code in kernel/cgroup.c attach_task() which skips the
attachment of a task to the group it is already in has to be
removed. Cpusets depends on reattaching a task to its current
cpuset, in order to trigger updating the cpus_allowed mask in the
task struct.
The dependency of cpusets on this is a hack, granted, but an
important one. It lets us avoid checking for a changed cpuset
'cpus' setting in critical scheduler code paths.
Signed-off-by: Paul Jackson <pj@xxxxxxx>
Cc: Paul Menage <menage@xxxxxxxxxx>
---
Andrew - this patch applies directly following the patch:
task-containersv11-add-tasks-file-interface.patch
kernel/cgroup.c | 3 ---
1 file changed, 3 deletions(-)
--- 2.6.23-rc8-mm1.orig/kernel/cgroup.c 2007-10-02 20:24:11.078925442 -0700
+++ 2.6.23-rc8-mm1/kernel/cgroup.c 2007-10-02 20:25:41.352279374 -0700
@@ -739,10 +739,7 @@ static int attach_task(struct cgroup *co
get_first_subsys(cont, NULL, &subsys_id);
- /* Nothing to do if the task is already in that cgroup */
oldcont = task_cgroup(tsk, subsys_id);
- if (cont == oldcont)
- return 0;
for_each_subsys(root, ss) {
if (ss->can_attach) {
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@xxxxxxx> 1.650.933.1373
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