linux-kernel - Re: [PATCH v2 15/15] x86/lib/memcpy_64.S: Convert memcpy to ALTERNATIVE

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Message-ID: <20150304135853.GF3516@pd.tnic>
Date:	Wed, 4 Mar 2015 14:58:53 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	X86 ML <x86@...nel.org>, Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 15/15] x86/lib/memcpy_64.S: Convert memcpy to
 ALTERNATIVE_2 macro

On Wed, Mar 04, 2015 at 08:26:33AM +0100, Ingo Molnar wrote:
> Since most CPUs we care about have ERMS, wouldn't it be better to
> patch in the actual memcpy_erms sequence into the primary memcpy()
> function? It's just about 9 bytes AFAICT.

Actually, most set REP_GOOD - all Intel family 6 and all relevant AMDs.

And only the newer Intels have ERMS. My SNB, for example doesn't while
IVB has it. So I'd guess everything >= IVB would have it.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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