linux-kernel - RE: [PATCH] sched/debug: print column titles of show_state

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Date:   Tue, 3 Aug 2021 08:47:24 +0000
From:   "S, Shirish" <Shirish.S@....com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] sched/debug: print column titles of
 show_state_filter()[V2]

[Public]

Can we get this patch merged ?
Any thoughts?


Regards,
Shirish S

-----Original Message-----
From: S, Shirish <Shirish.S@....com> 
Sent: Wednesday, July 14, 2021 8:57 AM
To: Ingo Molnar <mingo@...hat.com>; Peter Zijlstra <peterz@...radead.org>; Juri Lelli <juri.lelli@...hat.com>; Vincent Guittot <vincent.guittot@...aro.org>; Dietmar Eggemann <dietmar.eggemann@....com>; Steven Rostedt <rostedt@...dmis.org>; Ben Segall <bsegall@...gle.com>; Mel Gorman <mgorman@...e.de>; Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: linux-kernel@...r.kernel.org; S, Shirish <Shirish.S@....com>
Subject: [PATCH] sched/debug: print column titles of show_state_filter()[V2]

This addition in the debug output shall improve readablitly..
Its not intuitive for users that the pid printed in last column is of parent process.

v2: Dropped #ifdef logic

Signed-off-by: Shirish S <shirish.s@....com>
Suggested-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/sched/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2d9ff40f4661..22cee4c0f4b1 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8194,6 +8194,9 @@ void show_state_filter(unsigned int state_filter)  {
 	struct task_struct *g, *p;
 
+	pr_info("  task%*s", BITS_PER_LONG == 32 ? 38 : 46,
+		"PC stack   pid father\n");
+
 	rcu_read_lock();
 	for_each_process_thread(g, p) {
 		/*
--
2.17.1