linux-kernel - Re: [PATCH 7/6] delayacct: Add sysctl to enable at runtime

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Date:   Mon, 10 May 2021 14:06:22 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     tglx@...utronix.de, mingo@...nel.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, bsingharora@...il.com, pbonzini@...hat.com,
        maz@...nel.org
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        riel@...riel.com, hannes@...xchg.org
Subject: Re: [PATCH 7/6] delayacct: Add sysctl to enable at runtime

On Mon, May 10, 2021 at 02:05:13PM +0200, Peter Zijlstra wrote:
> 
> Just like sched_schedstats, allow runtime enabling (and disabling) of
> delayacct. This is useful if one forgot to add the delayacct boot time
> option.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  Documentation/accounting/delay-accounting.rst |    6 ++--
>  kernel/delayacct.c                            |   36 ++++++++++++++++++++++++--
>  kernel/sysctl.c                               |   12 ++++++++
>  3 files changed, 50 insertions(+), 4 deletions(-)

*sigh*, the below hunk went missing..


--- a/include/linux/delayacct.h
+++ b/include/linux/delayacct.h
@@ -65,6 +65,10 @@ DECLARE_STATIC_KEY_FALSE(delayacct_key);
 extern int delayacct_on;	/* Delay accounting turned on/off */
 extern struct kmem_cache *delayacct_cache;
 extern void delayacct_init(void);
+
+extern int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
+			    size_t *lenp, loff_t *ppos);
+
 extern void __delayacct_tsk_init(struct task_struct *);
 extern void __delayacct_tsk_exit(struct task_struct *);
 extern void __delayacct_blkio_start(void);