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| author | Waiman Long | 2018-11-08 16:08:46 +0100 |
|---|---|---|
| committer | Tejun Heo | 2018-11-08 21:27:32 +0100 |
| commit | 5cf8114d6e90b3822be5eb6a2faedf99d1c08f77 (patch) | |
| tree | 16b09eef25c0af64f99e434122240bd5e652fde3 /kernel/cgroup/cpuset.c | |
| parent | cpuset: Add documentation about the new "cpuset.sched.partition" flag (diff) | |
| download | kernel-qcow2-linux-5cf8114d6e90b3822be5eb6a2faedf99d1c08f77.tar.gz kernel-qcow2-linux-5cf8114d6e90b3822be5eb6a2faedf99d1c08f77.tar.xz kernel-qcow2-linux-5cf8114d6e90b3822be5eb6a2faedf99d1c08f77.zip | |
cpuset: Expose cpuset.cpus.subpartitions with cgroup_debug
For debugging purpose, it will be useful to expose the content of the
subparts_cpus as a read-only file to see if the code work correctly.
However, subparts_cpus will not be used at all in most use cases. So
adding a new cpuset file that clutters the cgroup directory may not be
desirable. This is now being done by using the hidden "cgroup_debug"
kernel command line option to expose a new "cpuset.cpus.subpartitions"
file.
That option was originally used by the debug controller to expose
itself when configured into the kernel. This is now extended to set an
internal flag used by cgroup_addrm_files(). A new CFTYPE_DEBUG flag
can now be used to specify that a cgroup file should only be created
when the "cgroup_debug" option is specified.
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup/cpuset.c')
| -rw-r--r-- | kernel/cgroup/cpuset.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index c739fda805e0..b897314bab53 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -2204,6 +2204,7 @@ typedef enum { FILE_MEMLIST, FILE_EFFECTIVE_CPULIST, FILE_EFFECTIVE_MEMLIST, + FILE_SUBPARTS_CPULIST, FILE_CPU_EXCLUSIVE, FILE_MEM_EXCLUSIVE, FILE_MEM_HARDWALL, @@ -2382,6 +2383,9 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v) case FILE_EFFECTIVE_MEMLIST: seq_printf(sf, "%*pbl\n", nodemask_pr_args(&cs->effective_mems)); break; + case FILE_SUBPARTS_CPULIST: + seq_printf(sf, "%*pbl\n", cpumask_pr_args(cs->subparts_cpus)); + break; default: ret = -EINVAL; } @@ -2634,6 +2638,13 @@ static struct cftype dfl_files[] = { .flags = CFTYPE_NOT_ON_ROOT, }, + { + .name = "cpus.subpartitions", + .seq_show = cpuset_common_seq_show, + .private = FILE_SUBPARTS_CPULIST, + .flags = CFTYPE_DEBUG, + }, + { } /* terminate */ }; |