linux-kernel - Re: [PATCH next 0/2] THP COW support for private executable file mmap

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Message-ID: <aUAUd_XJPVsl_CZL@casper.infradead.org>
Date: Mon, 15 Dec 2025 14:00:23 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Zhang Qilong <zhangqilong3@...wei.com>
Cc: akpm@...ux-foundation.org, david@...nel.org, lorenzo.stoakes@...cle.com,
	corbet@....net, ziy@...dia.com, baolin.wang@...ux.alibaba.com,
	Liam.Howlett@...cle.com, npache@...hat.com, ryan.roberts@....com,
	dev.jain@....com, baohua@...nel.org, lance.yang@...ux.dev,
	vbabka@...e.cz, rppt@...nel.org, surenb@...gle.com, mhocko@...e.com,
	wangkefeng.wang@...wei.com, sunnanyong@...wei.com,
	linux-mm@...ck.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH next 0/2] THP COW support for private executable file mmap

On Mon, Dec 15, 2025 at 08:34:05PM +0800, Zhang Qilong wrote:
> This patch series implementate THP COW for private executable file
> mmap. It's major designed to increase the iTLB cache hit rate for
> hot patching application, and we add a new sysfs knob to disable or
> enable it.

You're going to have to provide data to get this patch in.  We've
deliberately not done this in the past due to memory consumption overhead.
So you need to prove that's now the wrong decision to make.

Microbenchmarks would be a bare minimum, but what are really needed are
numbers from actual workloads.