linux-kernel - [PATCH v2 3/3] Documentation: add description of forceidle

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Date: Thu,  7 Mar 2024 18:19:45 +0800
From: Cruz Zhao <CruzZhao@...ux.alibaba.com>
To: tj@...nel.org,
	lizefan.x@...edance.com,
	hannes@...xchg.org,
	mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	bristot@...hat.com,
	vschneid@...hat.com
Cc: cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] Documentation: add description of forceidle_task time statistics

Add description of forceidle_task time statistics, including task
perspective and cgroup perspective. The difference from forceidle
time is that, forceidle_task time doesn't contain irq time.

Signed-off-by: Cruz Zhao <CruzZhao@...ux.alibaba.com>
---
 Documentation/admin-guide/cgroup-v2.rst               | 3 ++-
 Documentation/admin-guide/hw-vuln/core-scheduling.rst | 8 +++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index b82717767c61..46de2bfa9a0f 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1081,9 +1081,10 @@ All time durations are in microseconds.
 	- user_usec
 	- system_usec
 
-	and the following six when the controller is enabled:
+	and the following seven when the controller is enabled:
 
 	- core_sched.force_idle_usec
+	- core_sched.force_idle_task_usec
 	- nr_periods
 	- nr_throttled
 	- throttled_usec
diff --git a/Documentation/admin-guide/hw-vuln/core-scheduling.rst b/Documentation/admin-guide/hw-vuln/core-scheduling.rst
index 95a4920a2a9b..536931ed283a 100644
--- a/Documentation/admin-guide/hw-vuln/core-scheduling.rst
+++ b/Documentation/admin-guide/hw-vuln/core-scheduling.rst
@@ -227,7 +227,7 @@ with SMT enabled. There are other use cases where this feature could be used:
 
 Statictics
 ----------
-A task's forceidle statistics are exported via 1 field in procfs.
+A task's forceidle statistics are exported via 2 field in procfs.
 
 /proc/$pid/sched:
 
@@ -236,6 +236,9 @@ A task's forceidle statistics are exported via 1 field in procfs.
    siblings are forced idle, the irq time of cpux during this period will be
    accounted to this task's force idle time.
 
+ - se.statistics.core_forceidle_task_sum: The time that this task is actually
+   running on cpu whose SMT siblings are forced idle, unit: ms.
+
 This interface is read-only.
 
 A group's forceidle statistics are exported via 1 filed in cpu.stat.
@@ -247,4 +250,7 @@ cpu.stat:
    whose SMT siblings are forced idle, the irq time of cpux during this period
    will be accounted to this cgroup's force idle time.
 
+ - core_sched.force_idle_task_usec: The time that this cgroup's tasks are
+   actually running on cpu whose SMT siblings are forced idle, unit: us.
+
 This interface is read-only.
-- 
2.39.3