linux-kernel - Re: [RFC] Improve memset

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Message-ID: <20190913075008.GA20638@zn.tnic>
Date:   Fri, 13 Sep 2019 09:50:08 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     x86-ml <x86@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Improve memset

On Fri, Sep 13, 2019 at 09:35:30AM +0200, Ingo Molnar wrote:
> That looks exciting - I'm wondering what effects this has on code 
> footprint - for example defconfig vmlinux code size, and what the average 
> per call site footprint impact is?
> 
> If the footprint effect is acceptable, then I'd expect this to improve 
> performance, especially in hot loops.

Well, it grows a bit but that's my conglomerate ugly patch so I'll redo
that test when I've cleaned it up:

   text    data     bss     dec     hex filename
19699924        5201260 1642568 26543752        1950688 vmlinux.before
19791674        5201388 1552456 26545518        1950d6e vmlinux.after

-- 
Regards/Gruss,
    Boris.

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