linux-kernel - Re: [PATCH] readahead: enforce full sync mmap readahead size

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Message-ID: <20090413135304.GB10143@localhost>
Date:	Mon, 13 Apr 2009 21:53:04 +0800
From:	Wu Fengguang <wfg@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"yinghan@...gle.com" <yinghan@...gle.com>
Subject: Re: [PATCH] readahead: enforce full sync mmap readahead size

On Sun, Apr 12, 2009 at 08:15:12AM -0700, Linus Torvalds wrote:
> 
> 
> On Sun, 12 Apr 2009, Wu Fengguang wrote:
> >
> > Now that we do readahead for sequential mmap reads, here is
> > a simple evaluation of the impacts, and one further optimization.
> 
> Hmm.
> 
> Wu, I just went through your latest (?) series of 1-9 and they all looked 
> (a) quite small and (b) all of them looked like good cleanups. 
> 
> And not only do they look good, you seem to have numbers to back it all up 
> too.
> 
> In other words, I'd really prefer to merge this sooner rather than later. 
> There just doesn't seem to be any reason _not_ to. Is there any reason to 
> not just take this? I realize that it's past -rc1, but this is way smaller 
> and saner-looking than the average patch that makes it in past -rc1.
> 
> Besides, it was originally posted before -rc1, and the last series didn't 
> have the much more intrusive page-fault-retry patches. I'd leave those for 
> the next merge window, but the read-ahead series (1-9 plus this final 
> one-liner) seem to be pure improvement - both in code readability _and_ in 
> numbers - with no real contentious issues.
> 
> No?

They shall be fine for 2.6.30. For some reasons I'm submitting them a
bit late, but they are in fact mostly old patches that have received
good pondering and tests in my cookroom :-)

Thanks,
Fengguang
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