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sparsemem support on MIPS

To: Ralf Baechle <>,,
Subject: sparsemem support on MIPS
From: naveen yadav <>
Date: Thu, 19 Aug 2010 21:04:21 +0530
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Original-recipient: rfc822;
 Dear all,

I build MIPS 32 with sparsemem support to take care of holes in
physical memory, this conserve memory but put overhead to speed
because of pointer redirection in pfn_to_page().

To prevent this conversion I tried to use
CONFIG_SPARSEMEM_VMEMMAP_ENABLE on MIPS 32 but kernel build fails
becauase most of the supported functions related to vmemmap are
supported for 64 bit architectures only.

I wish to compare memory and speed result with / without
CONFIG_SPARSEMEM_VMEMMAP_ENABLE in MIPS 32. I need your comment in it


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