linux-kernel - Re: [PATCH v2 10/30] Add x86-specific parity functions

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Date:	Thu, 7 Apr 2016 15:10:17 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	zengzhaoxiu@....com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, dvlasenk@...hat.com, bp@...e.de,
	akpm@...ux-foundation.org, dvyukov@...gle.com,
	keescook@...omium.org, linux-kernel@...r.kernel.org,
	Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>
Subject: Re: [PATCH v2 10/30] Add x86-specific parity functions

On Wed, 06 Apr 2016 12:45:27 -0700
Andi Kleen <andi@...stfloor.org> wrote:

> zengzhaoxiu@....com writes:
> 
> > From: Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>
> >
> > Use alternatives, lifted from arch_hweight  
> 
> Is there actually anything performance critical in the kernel that uses
> parity?

On very low end devices some of the flash, but the implementation here is
ironically pretty much worst-case for such x86 devices 8)

Alan