linux-kernel - Re: [PATCH 2/2] mm, rmap: handle anon_vma

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Message-ID: <Z1byK9X59RHFJMHZ@casper.infradead.org>
Date: Mon, 9 Dec 2024 13:35:39 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Jinjie Ruan <ruanjinjie@...wei.com>
Cc: viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
	akpm@...ux-foundation.org, Liam.Howlett@...cle.com,
	lokeshgidra@...gle.com, lorenzo.stoakes@...cle.com, rppt@...nel.org,
	aarcange@...hat.com, Jason@...c4.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/2] mm, rmap: handle anon_vma_fork() NULL check inline

On Mon, Dec 09, 2024 at 09:25:49PM +0800, Jinjie Ruan wrote:
> Check the anon_vma of pvma inline so we can avoid the function call
> overhead if the anon_vma is NULL.

This really gets you 1% perf improvement?  On what hardware?