linux-kernel - Re: [RFC v3 0/5] Transparent on-demand struct page initialization embedded in the buddy allocator

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Message-ID: <CA+55aFyeEK6FfNC-7SjGdYVrjiES0V7JNUG==P5p6iu+UNiAfA@mail.gmail.com>
Date:	Tue, 13 Aug 2013 16:55:21 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	Mike Travis <travis@....com>, Peter Anvin <hpa@...or.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Robin Holt <holt@....com>,
	Rob Landley <rob@...dley.net>,
	Daniel J Blueman <daniel@...ascale-asia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Yinghai Lu <yinghai@...nel.org>, Mel Gorman <mgorman@...e.de>
Subject: Re: [RFC v3 0/5] Transparent on-demand struct page initialization
 embedded in the buddy allocator

On Tue, Aug 13, 2013 at 4:10 PM, Nathan Zimmer <nzimmer@....com> wrote:
>
> The only mm structure we are adding to is a new flag in page->flags.
> That didn't seem too much.

I don't agree.

I see only downsides, and no upsides. Doing the same thing *without*
the downsides seems straightforward, so I simply see no reason for any
extra flags or tests at runtime.

               Linus
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