cpuset: export effective masks to userspace

cpuset.cpus and cpuset.mems are the configured masks, and we need
to export effective masks to userspace, so users know the real
cpus_allowed and mems_allowed that apply to the tasks in a cpuset.

v2:
- export those masks unconditionally, suggested by Tejun.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 65878a74a66b3eb5e171c87eaf4ffe22e98bc63d..53a9bbf163912a9298595dacf1445c4c5b1ad916 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1535,6 +1535,8 @@ typedef enum {
        FILE_MEMORY_MIGRATE,
        FILE_CPULIST,
        FILE_MEMLIST,
+       FILE_EFFECTIVE_CPULIST,
+       FILE_EFFECTIVE_MEMLIST,
        FILE_CPU_EXCLUSIVE,
        FILE_MEM_EXCLUSIVE,
        FILE_MEM_HARDWALL,
@@ -1701,6 +1703,12 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v)
        case FILE_MEMLIST:
                s += nodelist_scnprintf(s, count, cs->mems_allowed);
                break;
+       case FILE_EFFECTIVE_CPULIST:
+               s += cpulist_scnprintf(s, count, cs->effective_cpus);
+               break;
+       case FILE_EFFECTIVE_MEMLIST:
+               s += nodelist_scnprintf(s, count, cs->effective_mems);
+               break;
        default:
                ret = -EINVAL;
                goto out_unlock;
@@ -1785,6 +1793,18 @@ static struct cftype files[] = {
                .private = FILE_MEMLIST,
        },
 
+       {
+               .name = "effective_cpus",
+               .seq_show = cpuset_common_seq_show,
+               .private = FILE_EFFECTIVE_CPULIST,
+       },
+
+       {
+               .name = "effective_mems",
+               .seq_show = cpuset_common_seq_show,
+               .private = FILE_EFFECTIVE_MEMLIST,
+       },
+
        {
                .name = "cpu_exclusive",
                .read_u64 = cpuset_read_u64,