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Message-ID: <114723fd-131c-44f4-be0a-3387dcc540f1@lucifer.local>
Date: Mon, 28 Oct 2024 22:22:05 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: SeongJae Park <sj@...nel.org>
Cc: 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, Oct 28, 2024 at 11:24:13AM -0700, SeongJae Park wrote:
> 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/ ;)
Ugh oops sorry Vlastimil! This was a silly typo... Andrew would you mind fixing
this up? I'll edit my local file for this so if I respin this will be corrected.
Thanks!
>
>
> Thanks,
> SJ
>
> [...]
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