linux-kernel - Re: [PATCH v4 0/5] implement lightweight guard pages

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Message-Id: <20241028182413.277218-1-sj@kernel.org>
Date: Mon, 28 Oct 2024 11:24:13 -0700
From: SeongJae Park <sj@...nel.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Matthew Wilcox <willy@...radead.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Jann Horn <jannh@...gle.com>,
	David Hildenbrand <david@...hat.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Muchun Song <muchun.song@...ux.dev>,
	Richard Henderson <richard.henderson@...aro.org>,
	Matt Turner <mattst88@...il.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	"James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
	Helge Deller <deller@....de>,
	Chris Zankel <chris@...kel.net>,
	Max Filippov <jcmvbkbc@...il.com>,
	Arnd Bergmann <arnd@...nel.org>,
	linux-alpha@...r.kernel.org,
	linux-mips@...r.kernel.org,
	linux-parisc@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Shuah Khan <shuah@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	linux-kselftest@...r.kernel.org,
	Sidhartha Kumar <sidhartha.kumar@...cle.com>,
	Jeff Xu <jeffxu@...omium.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-api@...r.kernel.org,
	John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v4 0/5] implement lightweight guard pages

On Mon, 28 Oct 2024 14:13:26 +0000 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:

> Userland library functions such as allocators and threading implementations
> often require regions of memory to act as 'guard pages' - mappings which,
> when accessed, result in a fatal signal being sent to the accessing
> process.
> 
> The current means by which these are implemented is via a PROT_NONE mmap()
> mapping, which provides the required semantics however incur an overhead of
> a VMA for each such region.
> 
> With a great many processes and threads, this can rapidly add up and incur
> a significant memory penalty. It also has the added problem of preventing
> merges that might otherwise be permitted.
> 
> This series takes a different approach - an idea suggested by Vlasimil
> Babka (and before him David Hildenbrand and Jann Horn - perhaps more - the

Nit.  s/Vlasimil/Vlastimil/ ;)


Thanks,
SJ

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