linux-kernel - Re: [PATCH] Have __free_pages_memory() free in larger chunks.

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Date:	Sun, 15 Sep 2013 13:03:39 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	mingo@...nel.org, hpa@...or.com,
	Robin Holt <robin.m.holt@...il.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>,
	Yinghai Lu <yinghai@...nel.org>, Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] Have __free_pages_memory() free in larger chunks.

On Tue, Sep 10, 2013 at 01:57:24PM -0500, Nathan Zimmer wrote:
> From: Robin Holt <robin.m.holt@...il.com>
> 
> On large memory machines it can take a few minutes to get through
> free_all_bootmem().
> 
> Currently, when free_all_bootmem() calls __free_pages_memory(), the
> number of contiguous pages that __free_pages_memory() passes to the
> buddy allocator is limited to BITS_PER_LONG.  BITS_PER_LONG was originally
> chosen to keep things similar to mm/nobootmem.c.  But it is more
> efficient to limit it to MAX_ORDER.
> 
>        base   new  change
> 8TB    202s  172s   30s
> 16TB   401s  351s   50s
> 
> That is around 1%-3% improvement on total boot time.
> 
> This patch was spun off from the boot time rfc Robin and I had been
> working on.
> 
> Signed-off-by: Robin Holt <robin.m.holt@...il.com>
> Signed-off-by: Nathan Zimmer <nzimmer@....com>
> To: "H. Peter Anvin" <hpa@...or.com>
> To: Ingo Molnar <mingo@...nel.org>
> Cc: Linux Kernel <linux-kernel@...r.kernel.org>
> Cc: Linux MM <linux-mm@...ck.org>
> Cc: Rob Landley <rob@...dley.net>
> Cc: Mike Travis <travis@....com>
> Cc: Daniel J Blueman <daniel@...ascale-asia.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Greg KH <gregkh@...uxfoundation.org>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Cc: Mel Gorman <mgorman@...e.de>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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