linux-kernel - Re: [PATCH v4 4/4] Use 2GB memory block size on large-memory x86-64 systems

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Message-ID: <CA+8MBbJNxxbp7ogChM11KwPYReuCsPDe0sxbpkge16UqVUdjFA@mail.gmail.com>
Date:	Tue, 25 Aug 2015 15:06:31 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Daniel J Blueman <daniel@...ascale.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Steffen Persvold <sp@...ascale.com>
Subject: Re: [PATCH v4 4/4] Use 2GB memory block size on large-memory x86-64 systems

On Tue, Aug 25, 2015 at 12:01 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> It does ... but this (attached) is simpler.  Your patch and mine both
>> allow the system to boot ...
>
> The version that fix with section_nr present checking may save couple thousands
> calling to get_nid_for_pfn(). section size / page_size = 128M/4k = 32k

Actually saves about 1.2 million calls. Your patch wins :-)

Reported-and-tested-by: Tony Luck <tony.luck@...el.com>

-Tony
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