Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v2

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To: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Subject: Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v2
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Tue, 1 Sep 2020 18:25:12 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, x86@xxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, Kees Cook <keescook@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <a8bb0319-0928-4687-9e9c-777c5860dbdd@csgroup.eu>
References: <20200827150030.282762-1-hch@lst.de> <a8bb0319-0928-4687-9e9c-777c5860dbdd@csgroup.eu>

On Tue, Sep 01, 2020 at 07:13:00PM +0200, Christophe Leroy wrote:

>     10.92%  dd       [kernel.kallsyms]  [k] iov_iter_zero

Interesting...  Could you get an instruction-level profile inside iov_iter_zero(),
along with the disassembly of that sucker?

Follow-Ups:
- Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v2
  - From: Christoph Hellwig
- Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v2
  - From: Christophe Leroy
- Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v2
  - From: Christophe Leroy
- Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v2
  - From: Matthew Wilcox

References:
- remove the last set_fs() in common code, and remove it for x86 and powerpc v2
  - From: Christoph Hellwig
- Re: remove the last set_fs() in common code, and remove it for x86 and powerpc v2
  - From: Christophe Leroy

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