linux-kernel - Re: [RFC PATCH 4/2] namei: Improve hash mixing if CONFIG_DCACHE_WORD

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Date:	Mon, 16 May 2016 11:51:04 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	George Spelvin <linux@...izon.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [RFC PATCH 4/2] namei: Improve hash mixing if CONFIG_DCACHE_WORD_ACCESS

On Mon, May 2, 2016 at 3:31 AM, George Spelvin <linux@...izon.com> wrote:
> The hash mixing between adding the next 64 bits of name
> was just a bit weak.
>
> Replaced with a still very fast but slightly more effective
> mixing function.

I'e applied this patch independently of all your other hash rework to my tree.

I verified that the code generation for the inner loop is still fine,
and it does look like a much better mixing function, as well as just
clean up the code.

I hope to get new versions of the actual <linux/hash.h> fixes during
this merge window from you.

Thanks,

              Linus