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

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Date:   Tue, 1 Sep 2020 18:25:12 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michael Ellerman <mpe@...erman.id.au>, x86@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: remove the last set_fs() in common code, and remove it for x86
 and powerpc v2

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?