linux-kernel - Re: [PATCH -next] cgroup/misc: Introduce misc.peak

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Message-ID: <ZoLlCl1-PMr5DKIG@slm.duckdns.org>
Date: Mon, 1 Jul 2024 07:19:06 -1000
From: Tejun Heo <tj@...nel.org>
To: Xiu Jianfeng <xiujianfeng@...wei.com>
Cc: lizefan.x@...edance.com, hannes@...xchg.org, corbet@....net,
	kamalesh.babulal@...cle.com, haitao.huang@...ux.intel.com,
	cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] cgroup/misc: Introduce misc.peak

On Mon, Jul 01, 2024 at 12:52:59PM +0000, Xiu Jianfeng wrote:
> +		if (new_usage > READ_ONCE(res->watermark))
> +			WRITE_ONCE(res->watermark, new_usage);

It'd be better to do cmpxchg loop on update. That doesn't make it noticeably
more expensive and the peak tracking would actually be accurate.

Thanks.

-- 
tejun