linux-kernel - Re: [linus:master] [mseal] 8be7258aad: stress-ng.pagemove.page_remaps_per

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Message-ID: <CAHk-=wgdTWpCqTMgM9SJxG2=oYwhAueU_fDHMPifjpH5eHG8qw@mail.gmail.com>
Date: Mon, 5 Aug 2024 12:33:58 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Jeff Xu <jeffxu@...gle.com>, Michael Ellerman <mpe@...erman.id.au>, 
	Nicholas Piggin <npiggin@...il.com>, Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Pedro Falcato <pedro.falcato@...il.com>, kernel test robot <oliver.sang@...el.com>, 
	Jeff Xu <jeffxu@...omium.org>, oe-lkp@...ts.linux.dev, lkp@...el.com, 
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, 
	Kees Cook <keescook@...omium.org>, "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
	Dave Hansen <dave.hansen@...el.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Guenter Roeck <groeck@...omium.org>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, 
	Jorge Lucangeli Obes <jorgelo@...omium.org>, Matthew Wilcox <willy@...radead.org>, 
	Muhammad Usama Anjum <usama.anjum@...labora.com>, Stephen Röttger <sroettger@...gle.com>, 
	Suren Baghdasaryan <surenb@...gle.com>, Amer Al Shanawany <amer.shanawany@...il.com>, 
	Javier Carrasco <javier.carrasco.cruz@...il.com>, Shuah Khan <shuah@...nel.org>, 
	linux-api@...r.kernel.org, linux-mm@...ck.org, ying.huang@...el.com, 
	feng.tang@...el.com, fengwei.yin@...el.com
Subject: Re: [linus:master] [mseal] 8be7258aad: stress-ng.pagemove.page_remaps_per_sec
 -4.4% regression

On Mon, 5 Aug 2024 at 11:55, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So please consider this a "maybe something like this" patch, but that
> 'arch_unmap()' really is pretty nasty

Actually, the whole powerpc vdso code confused me. It's not the vvar
thing that wants this close thing, it's the other ones that have the
remap thing.

.. and there were two of those error cases that needed to reset the
vdso pointer.

That all shows just how carefully I was reading this code.

New version - still untested, but now I've read through it one more
time - attached.

                Linus

View attachment "patch.diff" of type "text/x-patch" (6923 bytes)