linux-kernel - Re: [PATCH 5/7] sched: loadavg: make calc_load

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Message-ID: <20180509094906.GI12217@hirez.programming.kicks-ass.net>
Date:   Wed, 9 May 2018 11:49:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Mike Galbraith <efault@....de>,
        Oliver Yang <yangoliver@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        xxx xxx <x.qendo@...il.com>,
        Taras Kondratiuk <takondra@...co.com>,
        Daniel Walker <danielwa@...co.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Ruslan Ruslichenko <rruslich@...co.com>, kernel-team@...com
Subject: Re: [PATCH 5/7] sched: loadavg: make calc_load_n() public

On Mon, May 07, 2018 at 05:01:33PM -0400, Johannes Weiner wrote:
> +static inline unsigned long
> +fixed_power_int(unsigned long x, unsigned int frac_bits, unsigned int n)
> +{
> +	unsigned long result = 1UL << frac_bits;
> +
> +	if (n) {
> +		for (;;) {
> +			if (n & 1) {
> +				result *= x;
> +				result += 1UL << (frac_bits - 1);
> +				result >>= frac_bits;
> +			}
> +			n >>= 1;
> +			if (!n)
> +				break;
> +			x *= x;
> +			x += 1UL << (frac_bits - 1);
> +			x >>= frac_bits;
> +		}
> +	}
> +
> +	return result;
> +}

No real objection; but that does look a wee bit fat for an inline I
suppose.