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-rw-r--r--kernel/cgroup/cgroup.c71
1 files changed, 69 insertions, 2 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 327f37c9fdfa..1140357d46f4 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -3550,7 +3550,65 @@ static int cgroup_cpu_pressure_show(struct seq_file *seq, void *v)
{
return psi_show(seq, &seq_css(seq)->cgroup->psi, PSI_CPU);
}
-#endif
+
+static ssize_t cgroup_pressure_write(struct kernfs_open_file *of, char *buf,
+ size_t nbytes, enum psi_res res)
+{
+ struct psi_trigger *new;
+ struct cgroup *cgrp;
+
+ cgrp = cgroup_kn_lock_live(of->kn, false);
+ if (!cgrp)
+ return -ENODEV;
+
+ cgroup_get(cgrp);
+ cgroup_kn_unlock(of->kn);
+
+ new = psi_trigger_create(&cgrp->psi, buf, nbytes, res);
+ if (IS_ERR(new)) {
+ cgroup_put(cgrp);
+ return PTR_ERR(new);
+ }
+
+ psi_trigger_replace(&of->priv, new);
+
+ cgroup_put(cgrp);
+
+ return nbytes;
+}
+
+static ssize_t cgroup_io_pressure_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ return cgroup_pressure_write(of, buf, nbytes, PSI_IO);
+}
+
+static ssize_t cgroup_memory_pressure_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ return cgroup_pressure_write(of, buf, nbytes, PSI_MEM);
+}
+
+static ssize_t cgroup_cpu_pressure_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ return cgroup_pressure_write(of, buf, nbytes, PSI_CPU);
+}
+
+static __poll_t cgroup_pressure_poll(struct kernfs_open_file *of,
+ poll_table *pt)
+{
+ return psi_trigger_poll(&of->priv, of->file, pt);
+}
+
+static void cgroup_pressure_release(struct kernfs_open_file *of)
+{
+ psi_trigger_replace(&of->priv, NULL);
+}
+#endif /* CONFIG_PSI */
static int cgroup_freeze_show(struct seq_file *seq, void *v)
{
@@ -4745,18 +4803,27 @@ static struct cftype cgroup_base_files[] = {
.name = "io.pressure",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = cgroup_io_pressure_show,
+ .write = cgroup_io_pressure_write,
+ .poll = cgroup_pressure_poll,
+ .release = cgroup_pressure_release,
},
{
.name = "memory.pressure",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = cgroup_memory_pressure_show,
+ .write = cgroup_memory_pressure_write,
+ .poll = cgroup_pressure_poll,
+ .release = cgroup_pressure_release,
},
{
.name = "cpu.pressure",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = cgroup_cpu_pressure_show,
+ .write = cgroup_cpu_pressure_write,
+ .poll = cgroup_pressure_poll,
+ .release = cgroup_pressure_release,
},
-#endif
+#endif /* CONFIG_PSI */
{ } /* terminate */
};