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.
cpuset.effective_cpus and cpuset.effective_mems will be created for
sane_behavior only.
v2:
- export those masks unconditionally, suggested by Tejun.
Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
---
kernel/cpuset.c | 34 ++++++++++++++++++++++++++++------
1 file changed, 28 insertions(+), 6 deletions(-)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index a98723d..c8ba514 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1614,6 +1614,8 @@ typedef enum {
FILE_MEMORY_MIGRATE,
FILE_CPULIST,
FILE_MEMLIST,
+ FILE_EFFECTIVE_CPULIST,
+ FILE_EFFECTIVE_MEMLIST,
FILE_CPU_EXCLUSIVE,
FILE_MEM_EXCLUSIVE,
FILE_MEM_HARDWALL,
@@ -1762,23 +1764,23 @@ out_unlock:
* across a page fault.
*/
-static size_t cpuset_sprintf_cpulist(char *page, struct cpuset *cs)
+static size_t cpuset_sprintf_cpulist(char *page, struct cpumask *pmask)
{
size_t count;
mutex_lock(&callback_mutex);
- count = cpulist_scnprintf(page, PAGE_SIZE, cs->cpus_allowed);
+ count = cpulist_scnprintf(page, PAGE_SIZE, pmask);
mutex_unlock(&callback_mutex);
return count;
}
-static size_t cpuset_sprintf_memlist(char *page, struct cpuset *cs)
+static size_t cpuset_sprintf_memlist(char *page, nodemask_t mask)
{
size_t count;
mutex_lock(&callback_mutex);
- count = nodelist_scnprintf(page, PAGE_SIZE, cs->mems_allowed);
+ count = nodelist_scnprintf(page, PAGE_SIZE, mask);
mutex_unlock(&callback_mutex);
return count;
@@ -1802,10 +1804,16 @@ static ssize_t cpuset_common_file_read(struct cgroup_subsys_state *css,
switch (type) {
case FILE_CPULIST:
- s += cpuset_sprintf_cpulist(s, cs);
+ s += cpuset_sprintf_cpulist(s, cs->cpus_allowed);
break;
case FILE_MEMLIST:
- s += cpuset_sprintf_memlist(s, cs);
+ s += cpuset_sprintf_memlist(s, cs->mems_allowed);
+ break;
+ case FILE_EFFECTIVE_CPULIST:
+ s += cpuset_sprintf_cpulist(s, cs->effective_cpus);
+ break;
+ case FILE_EFFECTIVE_MEMLIST:
+ s += cpuset_sprintf_memlist(s, cs->effective_mems);
break;
default:
retval = -EINVAL;
@@ -1880,6 +1888,13 @@ static struct cftype files[] = {
},
{
+ .name = "effective_cpus",
+ .read = cpuset_common_file_read,
+ .max_write_len = (100U + 6 * NR_CPUS),
+ .private = FILE_EFFECTIVE_CPULIST,
+ },
+
+ {
.name = "mems",
.read = cpuset_common_file_read,
.write_string = cpuset_write_resmask,
@@ -1888,6 +1903,13 @@ static struct cftype files[] = {
},
{
+ .name = "effective_mems",
+ .read = cpuset_common_file_read,
+ .max_write_len = (100U + 6 * MAX_NUMNODES),
+ .private = FILE_EFFECTIVE_MEMLIST,
+ },
+
+ {
.name = "cpu_exclusive",
.read_u64 = cpuset_read_u64,
.write_u64 = cpuset_write_u64,
--
1.8.0.2
--
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