linux-kernel - Re: [PATCH v4 0/8] Multibyte memset variations

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Message-ID: <20170725130818.GA23770@bombadil.infradead.org>
Date:   Tue, 25 Jul 2017 06:08:18 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, minchan@...nel.org,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        akpm@...uxfoundation.org
Subject: Re: [PATCH v4 0/8] Multibyte memset variations

On Tue, Jul 25, 2017 at 03:27:38PM +1000, Michael Ellerman wrote:
> Matthew Wilcox <willy@...radead.org> writes:
> 
> > From: Matthew Wilcox <mawilcox@...rosoft.com>
> >
> > A relatively common idiom we're missing is a function to fill an area
> > of memory with a pattern which is larger than a single byte.  I first
> > noticed this with a zram patch which wanted to fill a page with an
> > 'unsigned long' value.  There turn out to be quite a few places in
> > the kernel which can benefit from using an optimised function rather
> > than a loop; sometimes text size, sometimes speed, and sometimes both.
> > The optimised PowerPC version (not included here) improves performance
> > by about 30% on POWER8 on just the raw memset_l().
> 
> Is the plan that Andrew will merge this series, or are you planning to
> put them in a tree of yours?

I'm hoping Andrew will take it, but I can put it in my own tree if he
doesn't want to take it.