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Message-ID: <20130915170339.GA3278@cmpxchg.org>
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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