linux-kernel - Re: [PATCH 5/5] x86: Move enabling of PSE and PGE out of init_memory

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Message-ID: <20120814202040.GB25632@google.com>
Date:	Tue, 14 Aug 2012 13:20:40 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Jacob Shin <jacob.shin@....com>
Cc:	Borislav Petkov <bp@...en8.de>, X86-ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH 5/5] x86: Move enabling of PSE and PGE out of
 init_memory_mapping

Hello,

On Tue, Aug 14, 2012 at 02:52:48PM -0500, Jacob Shin wrote:
> > You mean pagetable_reserve() right?
> 
> This is actually needed on every call to init_memory_mapping(),
> 
> My patch 2/5 changes find_early_table_space() to find just enough space
> to map start to end. The pagetable_reserve() will then reserve what we
> actually used. Since init_memory_mapping() is called again and again
> with different start to end ranges, we find space for the page tables
> and reserve them every time.

I thought the function was rebuilding pagetable for the whole memory
area each time.  Maybe I misread.  Does it only build the part which
is newly being mapped?

Thanks.

-- 
tejun
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