linux-kernel - Re: [PATCH] Add a text

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Message-ID: <CA+55aFxJGidV4=ot0z_Va8+y2QWTDYghTm1Gin84StZ+R1SfXg@mail.gmail.com>
Date:	Fri, 29 Nov 2013 16:22:01 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Oleg Nesterov <oleg@...hat.com>, Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] Add a text_poke syscall v2

On Fri, Nov 29, 2013 at 3:24 PM, Jiri Kosina <jkosina@...e.cz> wrote:
>
> Do you think this'd be faster than the int3-based aproach?

Unlikely to be faster, but perhaps more robust and more portable. Maybe.

And the reason we use the int3-based approach is that doing TLB
shootdowns of kernel mappings is completely out of the question, not
to mention not portable (kernel code may not even be in a page table
to begin with).

Remember: the current text_poke is all about kernel code. So the rules
for user space may well be entirely different.

           Linus
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