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authorWang Long <w@laoqinren.net>2019-12-18 20:38:18 +0800
committerPeter Zijlstra <peterz@infradead.org>2020-01-17 10:19:22 +0100
commit3d817689a62cf71bbb290af18cd26cf9764f38fe (patch)
tree649fe8b3effdf91b818a9cd6bdc23634f6e0a8e1 /kernel/sched
parent4c58f57fa6e93318a0899f70d8b99fe6bac22ce8 (diff)
sched/psi: create /proc/pressure and /proc/pressure/{io|memory|cpu} only when psi enabled
when CONFIG_PSI_DEFAULT_DISABLED set to N or the command line set psi=0, I think we should not create /proc/pressure and /proc/pressure/{io|memory|cpu}. In the future, user maybe determine whether the psi feature is enabled by checking the existence of the /proc/pressure dir or /proc/pressure/{io|memory|cpu} files. Signed-off-by: Wang Long <w@laoqinren.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Link: https://lkml.kernel.org/r/1576672698-32504-1-git-send-email-w@laoqinren.net
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/psi.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index ce8f6748678a..db7b50bba3f1 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -1280,10 +1280,12 @@ static const struct file_operations psi_cpu_fops = {
static int __init psi_proc_init(void)
{
- proc_mkdir("pressure", NULL);
- proc_create("pressure/io", 0, NULL, &psi_io_fops);
- proc_create("pressure/memory", 0, NULL, &psi_memory_fops);
- proc_create("pressure/cpu", 0, NULL, &psi_cpu_fops);
+ if (psi_enable) {
+ proc_mkdir("pressure", NULL);
+ proc_create("pressure/io", 0, NULL, &psi_io_fops);
+ proc_create("pressure/memory", 0, NULL, &psi_memory_fops);
+ proc_create("pressure/cpu", 0, NULL, &psi_cpu_fops);
+ }
return 0;
}
module_init(psi_proc_init);