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Message-Id: <20070817084320.26003.32578.sendpatchset@balbir-laptop>
Date: Fri, 17 Aug 2007 14:13:20 +0530
From: Balbir Singh <balbir@...ux.vnet.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Paul Menage <menage@...gle.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Containers <containers@...ts.osdl.org>,
YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Eric W Biederman <ebiederm@...ssion.com>,
Linux MM Mailing List <linux-mm@...ck.org>,
Nick Piggin <npiggin@...e.de>,
Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
Pavel Emelianov <xemul@...nvz.org>,
Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
Balbir Singh <balbir@...ux.vnet.ibm.com>,
Dave Hansen <haveblue@...ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: [-mm PATCH 5/9] Memory controller task migration (v6)
Allow tasks to migrate from one container to the other. We migrate
mm_struct's mem_container only when the thread group id migrates.
Signed-off-by: <balbir@...ux.vnet.ibm.com>
---
mm/memcontrol.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff -puN mm/memcontrol.c~mem-control-task-migration mm/memcontrol.c
--- linux-2.6.23-rc2-mm2/mm/memcontrol.c~mem-control-task-migration 2007-08-17 13:14:19.000000000 +0530
+++ linux-2.6.23-rc2-mm2-balbir/mm/memcontrol.c 2007-08-17 13:14:19.000000000 +0530
@@ -326,11 +326,46 @@ static int mem_container_populate(struct
ARRAY_SIZE(mem_container_files));
}
+static void mem_container_move_task(struct container_subsys *ss,
+ struct container *cont,
+ struct container *old_cont,
+ struct task_struct *p)
+{
+ struct mm_struct *mm;
+ struct mem_container *mem, *old_mem;
+
+ mm = get_task_mm(p);
+ if (mm == NULL)
+ return;
+
+ mem = mem_container_from_cont(cont);
+ old_mem = mem_container_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_container, mem);
+ css_put(&old_mem->css);
+
+out:
+ mmput(mm);
+ return;
+}
+
struct container_subsys mem_container_subsys = {
.name = "memory",
.subsys_id = mem_container_subsys_id,
.create = mem_container_create,
.destroy = mem_container_destroy,
.populate = mem_container_populate,
+ .attach = mem_container_move_task,
.early_init = 1,
};
_
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
-
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