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authorTejun Heo <tj@kernel.org>2022-09-06 22:38:55 +0300
committerTejun Heo <tj@kernel.org>2022-09-06 22:38:55 +0300
commit8a693f7766f9e27c390c5fec8a5db1f9d1d8177e (patch)
treefeb54c06b800520209d311a55027ccfb7447938c /kernel/cgroup
parent0083d27b21dd2a598df8275b98f89ced532e2e53 (diff)
downloadlinux-8a693f7766f9e27c390c5fec8a5db1f9d1d8177e.tar.xz
cgroup: Remove CFTYPE_PRESSURE
CFTYPE_PRESSURE is used to flag PSI related files so that they are not created if PSI is disabled during boot. It's a bit weird to use a generic flag to mark a specific file type. Let's instead move the PSI files into its own cftypes array and add/rm them conditionally. This is a bit more code but cleaner. No userland visible changes. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org>
Diffstat (limited to 'kernel/cgroup')
-rw-r--r--kernel/cgroup/cgroup.c64
1 files changed, 37 insertions, 27 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index bd9fe6e88320..e24015877d3c 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -217,6 +217,7 @@ struct cgroup_namespace init_cgroup_ns = {
static struct file_system_type cgroup2_fs_type;
static struct cftype cgroup_base_files[];
+static struct cftype cgroup_psi_files[];
/* cgroup optional features */
enum cgroup_opt_features {
@@ -1689,12 +1690,16 @@ static void css_clear_dir(struct cgroup_subsys_state *css)
css->flags &= ~CSS_VISIBLE;
if (!css->ss) {
- if (cgroup_on_dfl(cgrp))
- cfts = cgroup_base_files;
- else
- cfts = cgroup1_base_files;
-
- cgroup_addrm_files(css, cgrp, cfts, false);
+ if (cgroup_on_dfl(cgrp)) {
+ cgroup_addrm_files(css, cgrp,
+ cgroup_base_files, false);
+ if (cgroup_psi_enabled())
+ cgroup_addrm_files(css, cgrp,
+ cgroup_psi_files, false);
+ } else {
+ cgroup_addrm_files(css, cgrp,
+ cgroup1_base_files, false);
+ }
} else {
list_for_each_entry(cfts, &css->ss->cfts, node)
cgroup_addrm_files(css, cgrp, cfts, false);
@@ -1717,14 +1722,22 @@ static int css_populate_dir(struct cgroup_subsys_state *css)
return 0;
if (!css->ss) {
- if (cgroup_on_dfl(cgrp))
- cfts = cgroup_base_files;
- else
- cfts = cgroup1_base_files;
-
- ret = cgroup_addrm_files(&cgrp->self, cgrp, cfts, true);
- if (ret < 0)
- return ret;
+ if (cgroup_on_dfl(cgrp)) {
+ ret = cgroup_addrm_files(&cgrp->self, cgrp,
+ cgroup_base_files, true);
+ if (ret < 0)
+ return ret;
+
+ if (cgroup_psi_enabled()) {
+ ret = cgroup_addrm_files(&cgrp->self, cgrp,
+ cgroup_psi_files, true);
+ if (ret < 0)
+ return ret;
+ }
+ } else {
+ cgroup_addrm_files(css, cgrp,
+ cgroup1_base_files, true);
+ }
} else {
list_for_each_entry(cfts, &css->ss->cfts, node) {
ret = cgroup_addrm_files(css, cgrp, cfts, true);
@@ -4132,8 +4145,6 @@ static int cgroup_addrm_files(struct cgroup_subsys_state *css,
restart:
for (cft = cfts; cft != cft_end && cft->name[0] != '\0'; cft++) {
/* does cft->flags tell us to skip this file on @cgrp? */
- if ((cft->flags & CFTYPE_PRESSURE) && !cgroup_psi_enabled())
- continue;
if ((cft->flags & __CFTYPE_ONLY_ON_DFL) && !cgroup_on_dfl(cgrp))
continue;
if ((cft->flags & __CFTYPE_NOT_ON_DFL) && cgroup_on_dfl(cgrp))
@@ -4218,9 +4229,6 @@ static int cgroup_init_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
break;
}
- if ((cft->flags & CFTYPE_PRESSURE) && !cgroup_psi_enabled())
- continue;
-
if (cft->seq_start)
kf_ops = &cgroup_kf_ops;
else
@@ -5144,10 +5152,13 @@ static struct cftype cgroup_base_files[] = {
.name = "cpu.stat",
.seq_show = cpu_stat_show,
},
+ { } /* terminate */
+};
+
+static struct cftype cgroup_psi_files[] = {
#ifdef CONFIG_PSI
{
.name = "io.pressure",
- .flags = CFTYPE_PRESSURE,
.seq_show = cgroup_io_pressure_show,
.write = cgroup_io_pressure_write,
.poll = cgroup_pressure_poll,
@@ -5155,7 +5166,6 @@ static struct cftype cgroup_base_files[] = {
},
{
.name = "memory.pressure",
- .flags = CFTYPE_PRESSURE,
.seq_show = cgroup_memory_pressure_show,
.write = cgroup_memory_pressure_write,
.poll = cgroup_pressure_poll,
@@ -5163,7 +5173,6 @@ static struct cftype cgroup_base_files[] = {
},
{
.name = "cpu.pressure",
- .flags = CFTYPE_PRESSURE,
.seq_show = cgroup_cpu_pressure_show,
.write = cgroup_cpu_pressure_write,
.poll = cgroup_pressure_poll,
@@ -5930,6 +5939,7 @@ int __init cgroup_init(void)
BUILD_BUG_ON(CGROUP_SUBSYS_COUNT > 16);
BUG_ON(cgroup_init_cftypes(NULL, cgroup_base_files));
+ BUG_ON(cgroup_init_cftypes(NULL, cgroup_psi_files));
BUG_ON(cgroup_init_cftypes(NULL, cgroup1_base_files));
cgroup_rstat_boot();
@@ -6821,9 +6831,6 @@ static ssize_t show_delegatable_files(struct cftype *files, char *buf,
if (!(cft->flags & CFTYPE_NS_DELEGATABLE))
continue;
- if ((cft->flags & CFTYPE_PRESSURE) && !cgroup_psi_enabled())
- continue;
-
if (prefix)
ret += snprintf(buf + ret, size - ret, "%s.", prefix);
@@ -6843,8 +6850,11 @@ static ssize_t delegate_show(struct kobject *kobj, struct kobj_attribute *attr,
int ssid;
ssize_t ret = 0;
- ret = show_delegatable_files(cgroup_base_files, buf, PAGE_SIZE - ret,
- NULL);
+ ret = show_delegatable_files(cgroup_base_files, buf + ret,
+ PAGE_SIZE - ret, NULL);
+ if (cgroup_psi_enabled())
+ ret += show_delegatable_files(cgroup_psi_files, buf + ret,
+ PAGE_SIZE - ret, NULL);
for_each_subsys(ss, ssid)
ret += show_delegatable_files(ss->dfl_cftypes, buf + ret,