linux-kernel - Re: [PATCH 12/15] tick/sched: Consolidate idle time fetching APIs

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Message-ID: <aYZsol2OIzMxoJXv@pavilion.home>
Date: Fri, 6 Feb 2026 23:35:14 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
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	Xin Zhao <jackzxcui1989@....com>, linux-pm@...r.kernel.org,
	linux-s390@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: Re: [PATCH 12/15] tick/sched: Consolidate idle time fetching APIs

Le Fri, Feb 06, 2026 at 03:22:42PM +0100, Frederic Weisbecker a écrit :
> +static u64 get_cpu_sleep_time_us(int cpu, enum cpu_usage_stat idx,
> +				 bool compute_delta, u64 *last_update_time)
> +{
> +	ktime_t now = ktime_get();
> +	u64 res;
> +
> +	if (vtime_generic_enabled_cpu(cpu))
> +		res = kcpustat_field(idx, cpu);
> +	else
> +		res = kcpustat_field_dyntick(cpu, idx, compute_delta, now);
> +
> +	do_div(res, NSEC_PER_USEC);
> +
> +	if (last_update_time)
> +		*last_update_time = res;

Urgh, this should be *last_update_time = ktime_to_us(now)

-- 
Frederic Weisbecker
SUSE Labs