linux-kernel - Re: [RFC PATCH 1/5] numa: introduce per-cgroup numa balancing locality, statistic

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Message-ID: <20190423084444.GB11158@hirez.programming.kicks-ass.net>
Date:   Tue, 23 Apr 2019 10:44:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     王贇 <yun.wang@...ux.alibaba.com>
Cc:     hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [RFC PATCH 1/5] numa: introduce per-cgroup numa balancing
 locality, statistic

On Mon, Apr 22, 2019 at 10:11:24AM +0800, 王贇 wrote:
> +#ifdef CONFIG_NUMA_BALANCING
> +
> +enum memcg_numa_locality_interval {
> +	PERCENT_0_9,
> +	PERCENT_10_19,
> +	PERCENT_20_29,
> +	PERCENT_30_39,
> +	PERCENT_40_49,
> +	PERCENT_50_59,
> +	PERCENT_60_69,
> +	PERCENT_70_79,
> +	PERCENT_80_89,
> +	PERCENT_90_100,
> +	NR_NL_INTERVAL,
> +};
> +
> +struct memcg_stat_numa {
> +	u64 locality[NR_NL_INTERVAL];
> +};

If you make that 8 it fits a single cacheline. Do you really need the
additional resolution? If so, then 16 would be the next logical amount
of buckets. 10 otoh makes no sense what so ever.