linux-kernel - Re: [RFC 2/4] Have __free_pages_memory() free in larger chunks.

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Message-ID: <CAE9FiQVYApvncM0gKZYoJ9LE0636rhCD70qGJe0ksxeXQ68jWw@mail.gmail.com>
Date:	Fri, 12 Jul 2013 20:08:56 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Robin Holt <holt@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Nate Zimmer <nzimmer@....com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>, Rob Landley <rob@...dley.net>,
	Mike Travis <travis@....com>,
	Daniel J Blueman <daniel@...ascale-asia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [RFC 2/4] Have __free_pages_memory() free in larger chunks.

On Fri, Jul 12, 2013 at 12:45 AM, Robin Holt <holt@....com> wrote:

> At the very least, I think we could change to:
> static void __init __free_pages_memory(unsigned long start, unsigned long end)
> {
>         int order;
>
>         while (start < end) {
>                 order = ffs(start);
>
>                 while (start + (1UL << order) > end)
>                         order--;
>
>                 __free_pages_bootmem(start, order);
>
>                 start += (1UL << order);
>         }
> }

should work, but need to make sure order < MAX_ORDER.

Yinghai
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