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Subject[PATCH 09/10] cgroup, cpuset: don't use ss->pre_attach()
Date
->pre_attach() is supposed to be called before migration, which is
observed during process migration but task migration does it the other
way around. The only ->pre_attach() user is cpuset which can do the
same operaitons in ->can_attach(). Collapse cpuset_pre_attach() into
cpuset_can_attach().

-v2: Patch contamination from later patch removed. Spotted by Paul
Menage.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Paul Menage <paul@paulmenage.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
---
kernel/cpuset.c | 29 ++++++++++++-----------------
1 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 472ddd6..f0b8df3 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1367,6 +1367,15 @@ static int fmeter_getrate(struct fmeter *fmp)
return val;
}

+/*
+ * Protected by cgroup_lock. The nodemasks must be stored globally because
+ * dynamically allocating them is not allowed in can_attach, and they must
+ * persist until attach.
+ */
+static cpumask_var_t cpus_attach;
+static nodemask_t cpuset_attach_nodemask_from;
+static nodemask_t cpuset_attach_nodemask_to;
+
/* Called by cgroups to determine if a cpuset is usable; cgroup_mutex held */
static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct cgroup_taskset *tset)
@@ -1393,29 +1402,16 @@ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
if ((ret = security_task_setscheduler(task)))
return ret;
}
- return 0;
-}
-
-/*
- * Protected by cgroup_lock. The nodemasks must be stored globally because
- * dynamically allocating them is not allowed in pre_attach, and they must
- * persist among pre_attach, and attach.
- */
-static cpumask_var_t cpus_attach;
-static nodemask_t cpuset_attach_nodemask_from;
-static nodemask_t cpuset_attach_nodemask_to;
-
-/* Set-up work for before attaching each task. */
-static void cpuset_pre_attach(struct cgroup *cont)
-{
- struct cpuset *cs = cgroup_cs(cont);

+ /* prepare for attach */
if (cs == &top_cpuset)
cpumask_copy(cpus_attach, cpu_possible_mask);
else
guarantee_online_cpus(cs, cpus_attach);

guarantee_online_mems(cs, &cpuset_attach_nodemask_to);
+
+ return 0;
}

static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
@@ -1901,7 +1897,6 @@ struct cgroup_subsys cpuset_subsys = {
.create = cpuset_create,
.destroy = cpuset_destroy,
.can_attach = cpuset_can_attach,
- .pre_attach = cpuset_pre_attach,
.attach = cpuset_attach,
.populate = cpuset_populate,
.post_clone = cpuset_post_clone,
--
1.7.3.1


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