linux-kernel - Re: [PATCH] [18/18] Implement hugepagesz= option for x86-64

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Date:	Mon, 17 Mar 2008 04:29:39 -0500
From:	Paul Jackson <pj@....com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH] [18/18] Implement hugepagesz= option for x86-64

Andi wrote:
+	hugepages=	[HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
+	hugepagesz=	[HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
+			On x86 this option can be specified multiple times
+			interleaved with hugepages= to reserve huge pages
+			of different sizes. Valid pages sizes on x86-64
+			are 2M (when the CPU supports "pse") and 1G (when the
+			CPU supports the "pdpe1gb" cpuinfo flag)
+			Note that 1GB pages can only be allocated at boot time
+			using hugepages= and not freed afterwards.

This seems to say that hugepages are required for hugepagesz to be
useful, but hugepagesz is supported on PPC, whereas hugepages is not
supported on PPC ...odd.

Should those two HW lists be the same (and sorted in the same order,
for ease of reading)?

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.940.382.4214
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