Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=67e465a77ba658635309ee00b367bec6555ea544
Commit:     67e465a77ba658635309ee00b367bec6555ea544
Parent:     8a9f3ccd24741b50200c3f33d62534c7271f3dfc
Author:     Balbir Singh <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 00:13:54 2008 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 08:42:18 2008 -0800

    Memory controller: task migration
    
    Allow tasks to migrate from one cgroup to the other.  We migrate
    mm_struct's mem_cgroup only when the thread group id migrates.
    
    Signed-off-by: Balbir Singh <[EMAIL PROTECTED]>
    Cc: Pavel Emelianov <[EMAIL PROTECTED]>
    Cc: Paul Menage <[EMAIL PROTECTED]>
    Cc: Peter Zijlstra <[EMAIL PROTECTED]>
    Cc: "Eric W. Biederman" <[EMAIL PROTECTED]>
    Cc: Nick Piggin <[EMAIL PROTECTED]>
    Cc: Kirill Korotaev <[EMAIL PROTECTED]>
    Cc: Herbert Poetzl <[EMAIL PROTECTED]>
    Cc: David Rientjes <[EMAIL PROTECTED]>
    Cc: Vaidyanathan Srinivasan <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 mm/memcontrol.c |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ebca767..b25df2a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -326,11 +326,46 @@ static int mem_cgroup_populate(struct cgroup_subsys *ss,
                                        ARRAY_SIZE(mem_cgroup_files));
 }
 
+static void mem_cgroup_move_task(struct cgroup_subsys *ss,
+                               struct cgroup *cont,
+                               struct cgroup *old_cont,
+                               struct task_struct *p)
+{
+       struct mm_struct *mm;
+       struct mem_cgroup *mem, *old_mem;
+
+       mm = get_task_mm(p);
+       if (mm == NULL)
+               return;
+
+       mem = mem_cgroup_from_cont(cont);
+       old_mem = mem_cgroup_from_cont(old_cont);
+
+       if (mem == old_mem)
+               goto out;
+
+       /*
+        * Only thread group leaders are allowed to migrate, the mm_struct is
+        * in effect owned by the leader
+        */
+       if (p->tgid != p->pid)
+               goto out;
+
+       css_get(&mem->css);
+       rcu_assign_pointer(mm->mem_cgroup, mem);
+       css_put(&old_mem->css);
+
+out:
+       mmput(mm);
+       return;
+}
+
 struct cgroup_subsys mem_cgroup_subsys = {
        .name = "memory",
        .subsys_id = mem_cgroup_subsys_id,
        .create = mem_cgroup_create,
        .destroy = mem_cgroup_destroy,
        .populate = mem_cgroup_populate,
+       .attach = mem_cgroup_move_task,
        .early_init = 1,
 };
-
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