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Date: Tue, 9 Oct 2012 18:03:33 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Konrad Rzeszutek Wilk <konrad@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
Tejun Heo <tj@...nel.org>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/10] x86, mm: get early page table from BRK
On Tue, Oct 9, 2012 at 9:01 AM, Konrad Rzeszutek Wilk <konrad@...nel.org> wrote:
>> +RESERVE_BRK(early_pgt_alloc, 16384);
>
> How did you come up with 16KB being the right size? What is this
> based on? Can you provide a comment explaining why 16KB is the
> right value on 32-bit and 64-bit machines?
good point, i add one line comment to the revised patch.
+/* need 3 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */
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