linux-kernel - Re: [PATCH v4 0/5] move per-vma lock into vm_area

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Message-ID: <Zz6UTvERgg9ubRu4@casper.infradead.org>
Date: Thu, 21 Nov 2024 02:00:46 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org,
	liam.howlett@...cle.com, lorenzo.stoakes@...cle.com,
	mhocko@...e.com, vbabka@...e.cz, hannes@...xchg.org,
	mjguzik@...il.com, oliver.sang@...el.com,
	mgorman@...hsingularity.net, david@...hat.com, peterx@...hat.com,
	oleg@...hat.com, dave@...olabs.net, paulmck@...nel.org,
	brauner@...nel.org, dhowells@...hat.com, hdanton@...a.com,
	hughd@...gle.com, minchan@...gle.com, jannh@...gle.com,
	souravpanda@...gle.com, pasha.tatashin@...een.com, corbet@....net,
	linux-doc@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH v4 0/5] move per-vma lock into vm_area_struct

On Wed, Nov 20, 2024 at 02:10:44PM -0800, Shakeel Butt wrote:
> If 'struct vm_area_struct' is prone to performance issues due to
> cacheline misalignments then we should do something about the
> __randomize_layout tag for it. I imagine we can identify the fields
> which might be performance critical to be on same cacheline or different
> cacheline due to false sharing then we can divide the fields into
> different cacheline groups and fields can be __randomize_layout within
> the group. WDYT?

Pretty sure the people who think security is more important than
performance are the only ones who randomize structs.