From f408f751e98521ca8cd74e088b0c39819d938198 Mon Sep 17 00:00:00 2001 From: Wang Long Date: Wed, 18 Dec 2019 20:38:18 +0800 Subject: [PATCH 1371/2944] sched/psi: create /proc/pressure and /proc/pressure/{io|memory|cpu} only when psi enabled task #28327019 commit 3d817689a62cf71bbb290af18cd26cf9764f38fe upstream 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 Signed-off-by: Peter Zijlstra (Intel) Acked-by: Johannes Weiner Link: https://lkml.kernel.org/r/1576672698-32504-1-git-send-email-w@laoqinren.net Signed-off-by: zhongjiang-ali Reviewed-by: Xunlei Pang --- kernel/sched/psi.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index 6e291ea..7964205 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -1290,10 +1290,12 @@ static int psi_fop_release(struct inode *inode, struct file *file) 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); -- 1.8.3.1