From: Robin Holt <holt@sgi.com>
Date: Thu, 13 Apr 2006 22:34:45 +0000 (-0700)
Subject: [IA64] Make show_mem() skip holes in a pgdat
X-Git-Tag: v2.6.17-rc2~77^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ace1d816a13ff42d4f41989862552032f9c19853;p=pandora-kernel.git

[IA64] Make show_mem() skip holes in a pgdat

This patch modifies ia64's show_mem() to walk the vmem_map page tables and
rapidly skip forward across regions where the page tables are missing.
This prevents the pfn_valid() check from causing numerous unnecessary
page faults.

Without this patch on a 512 node 512 cpu system where every node has four
memory holes, the show_mem() call takes 1 hour 18 minutes.  With this
patch, it takes less than 3 seconds.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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