linux-kernel - [tip: sched/core] sched/debug: Increase SCHEDSTAT

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Date: Tue, 12 Mar 2024 12:00:33 -0000
From: "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Shrikanth Hegde <sshegde@...ux.ibm.com>, Ingo Molnar <mingo@...nel.org>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/debug: Increase SCHEDSTAT_VERSION to 16

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     11b0bfa5d463b17cac5bf6b94fea4921713530c3
Gitweb:        https://git.kernel.org/tip/11b0bfa5d463b17cac5bf6b94fea4921713530c3
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Fri, 08 Mar 2024 11:58:55 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 12 Mar 2024 11:03:40 +01:00

sched/debug: Increase SCHEDSTAT_VERSION to 16

We changed the order of definitions within 'enum cpu_idle_type',
which changed the order of [CPU_MAX_IDLE_TYPES] columns in
show_schedstat().

Suggested-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: "Gautham R. Shenoy" <gautham.shenoy@....com>
Link: https://lore.kernel.org/r/20240308105901.1096078-5-mingo@kernel.org
---
 Documentation/scheduler/sched-stats.rst | 5 +++++
 kernel/sched/stats.c                    | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/scheduler/sched-stats.rst b/Documentation/scheduler/sched-stats.rst
index 03c0629..73c4126 100644
--- a/Documentation/scheduler/sched-stats.rst
+++ b/Documentation/scheduler/sched-stats.rst
@@ -2,6 +2,11 @@
 Scheduler Statistics
 ====================
 
+Version 16 of schedstats changed the order of definitions within
+'enum cpu_idle_type', which changed the order of [CPU_MAX_IDLE_TYPES]
+columns in show_schedstat(). In particular the position of CPU_IDLE
+and __CPU_NOT_IDLE changed places. The size of the array is unchanged.
+
 Version 15 of schedstats dropped counters for some sched_yield:
 yld_exp_empty, yld_act_empty and yld_both_empty. Otherwise, it is
 identical to version 14.
diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c
index 8527795..78e48f5 100644
--- a/kernel/sched/stats.c
+++ b/kernel/sched/stats.c
@@ -113,7 +113,7 @@ void __update_stats_enqueue_sleeper(struct rq *rq, struct task_struct *p,
  * Bump this up when changing the output format or the meaning of an existing
  * format, so that tools can adapt (or abort)
  */
-#define SCHEDSTAT_VERSION 15
+#define SCHEDSTAT_VERSION 16
 
 static int show_schedstat(struct seq_file *seq, void *v)
 {