diff options
author | Li Zefan <lizefan@huawei.com> | 2014-07-09 16:47:16 +0800 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2014-07-09 15:56:15 -0400 |
commit | 1344ab9c2991b45bacfd2e26a8800a62663ae427 (patch) | |
tree | 310953e680ff3536034cfb982bc3afa32e300f5d | |
parent | e2b9a3d7d8f4ab2f3491b8ed2ac6af692a2269b2 (diff) | |
download | linux-1344ab9c2991b45bacfd2e26a8800a62663ae427.tar.bz2 |
cpuset: update cpuset->effective_{cpus,mems} at hotplug
We're going to have separate user-configured masks and effective ones.
Eventually configured masks can only be changed by writing cpuset.cpus
and cpuset.mems, and they won't be restricted by parent cpuset. While
effective masks reflect cpu/memory hotplug and hierachical restriction,
and these are the real masks that apply to the tasks in the cpuset.
We calculate effective mask this way:
- top cpuset's effective_mask == online_mask, otherwise
- cpuset's effective_mask == configured_mask & parent effective_mask,
if the result is empty, it inherits parent effective mask.
Those behavior changes are for default hierarchy only. For legacy
hierarchy, effective_mask and configured_mask are the same, so we won't
break old interfaces.
To make cs->effective_{cpus,mems} to be effective masks, we need to
- update the effective masks at hotplug
- update the effective masks at config change
- take on ancestor's mask when the effective mask is empty
The first item is done here.
This won't introduce behavior change.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
-rw-r--r-- | kernel/cpuset.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index ef0974c73b4b..94f651d2eee5 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2082,6 +2082,7 @@ retry: mutex_lock(&callback_mutex); cpumask_andnot(cs->cpus_allowed, cs->cpus_allowed, &off_cpus); + cpumask_andnot(cs->effective_cpus, cs->effective_cpus, &off_cpus); mutex_unlock(&callback_mutex); /* @@ -2096,6 +2097,7 @@ retry: mutex_lock(&callback_mutex); nodes_andnot(cs->mems_allowed, cs->mems_allowed, off_mems); + nodes_andnot(cs->effective_mems, cs->effective_mems, off_mems); mutex_unlock(&callback_mutex); /* @@ -2159,6 +2161,7 @@ static void cpuset_hotplug_workfn(struct work_struct *work) if (cpus_updated) { mutex_lock(&callback_mutex); cpumask_copy(top_cpuset.cpus_allowed, &new_cpus); + cpumask_copy(top_cpuset.effective_cpus, &new_cpus); mutex_unlock(&callback_mutex); /* we don't mess with cpumasks of tasks in top_cpuset */ } @@ -2167,6 +2170,7 @@ static void cpuset_hotplug_workfn(struct work_struct *work) if (mems_updated) { mutex_lock(&callback_mutex); top_cpuset.mems_allowed = new_mems; + top_cpuset.effective_mems = new_mems; mutex_unlock(&callback_mutex); update_tasks_nodemask(&top_cpuset); } |