linux-kernel - Re: [PATCH 3/8] readahead: replace ra->mmap_miss with ra->ra

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Message-Id: <20111123123150.8a1ac462.akpm@linux-foundation.org>
Date:	Wed, 23 Nov 2011 12:31:50 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/8] readahead: replace ra->mmap_miss with ra->ra_flags

On Wed, 23 Nov 2011 20:47:45 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

> > should be ulong, which is compatible with the bitops.h code.
> > Or perhaps we should use a bitfield and let the compiler do the work.
> 
> What if we do
> 
>         u16     mmap_miss;
>         u16     ra_flags;
> 
> That would get rid of this patch. I'd still like to pack the various
> flags as well as pattern into one single ra_flags, which makes it
> convenient to pass things around (as one single parameter).

I'm not sure that this will improve things much...

Again, how does the code look if you use a bitfield and let the
compiler do the worK?
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