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Subject[RFC][PATCH 12/16] sched: A quick and dirty cgroup tagging interface
Marks all tasks in a cgroup as matching for core-scheduling.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/core.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
kernel/sched/sched.h | 4 +++
2 files changed, 66 insertions(+)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6608,6 +6608,15 @@ static void sched_change_group(struct ta
tg = container_of(task_css_check(tsk, cpu_cgrp_id, true),
struct task_group, css);
tg = autogroup_task_group(tsk, tg);
+
+#ifdef CONFIG_SCHED_CORE
+ if ((unsigned long)tsk->sched_task_group == tsk->core_cookie)
+ tsk->core_cookie = 0UL;
+
+ if (tg->tagged /* && !tsk->core_cookie ? */)
+ tsk->core_cookie = (unsigned long)tg;
+#endif
+
tsk->sched_task_group = tg;

#ifdef CONFIG_FAIR_GROUP_SCHED
@@ -7067,6 +7076,43 @@ static u64 cpu_rt_period_read_uint(struc
}
#endif /* CONFIG_RT_GROUP_SCHED */

+#ifdef CONFIG_SCHED_CORE
+static u64 cpu_core_tag_read_u64(struct cgroup_subsys_state *css, struct cftype *cft)
+{
+ struct task_group *tg = css_tg(css);
+
+ return !!tg->tagged;
+}
+
+static int cpu_core_tag_write_u64(struct cgroup_subsys_state *css, struct cftype *cft, u64 val)
+{
+ struct task_group *tg = css_tg(css);
+ struct css_task_iter it;
+ struct task_struct *p;
+
+ if (val > 1)
+ return -ERANGE;
+
+ if (tg->tagged == !!val)
+ return 0;
+
+ tg->tagged = !!val;
+
+ if (!!val)
+ sched_core_get();
+
+ css_task_iter_start(css, 0, &it);
+ while ((p = css_task_iter_next(&it)))
+ p->core_cookie = !!val ? (unsigned long)tg : 0UL;
+ css_task_iter_end(&it);
+
+ if (!val)
+ sched_core_put();
+
+ return 0;
+}
+#endif
+
static struct cftype cpu_legacy_files[] = {
#ifdef CONFIG_FAIR_GROUP_SCHED
{
@@ -7103,6 +7149,14 @@ static struct cftype cpu_legacy_files[]
.write_u64 = cpu_rt_period_write_uint,
},
#endif
+#ifdef CONFIG_SCHED_CORE
+ {
+ .name = "tag",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .read_u64 = cpu_core_tag_read_u64,
+ .write_u64 = cpu_core_tag_write_u64,
+ },
+#endif
{ } /* Terminate */
};

@@ -7270,6 +7324,14 @@ static struct cftype cpu_files[] = {
.write = cpu_max_write,
},
#endif
+#ifdef CONFIG_SCHED_CORE
+ {
+ .name = "tag",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .read_u64 = cpu_core_tag_read_u64,
+ .write_u64 = cpu_core_tag_write_u64,
+ },
+#endif
{ } /* terminate */
};

--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -363,6 +363,10 @@ struct cfs_bandwidth {
struct task_group {
struct cgroup_subsys_state css;

+#ifdef CONFIG_SCHED_CORE
+ int tagged;
+#endif
+
#ifdef CONFIG_FAIR_GROUP_SCHED
/* schedulable entities of this group on each CPU */
struct sched_entity **se;

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