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authorYinghai Lu <yhlu.kernel@gmail.com>2008-07-12 14:32:45 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-13 08:19:16 +0200
commit9958e810f8ac92f8a447035ee6555420ba27b847 (patch)
tree1761a7d04aebeb9b345ea8e2b74abd555a9c3926 /arch/x86/mm/init_64.c
parent965194c15dc9e4f3bc44432b39c441c86af7f11d (diff)
downloadop-kernel-dev-9958e810f8ac92f8a447035ee6555420ba27b847.zip
op-kernel-dev-9958e810f8ac92f8a447035ee6555420ba27b847.tar.gz
x86: max_low_pfn_mapped fix, #3
optimization: try to merge the range with same page size in init_memory_mapping, to get the best possible linear mappings set up. thus when GBpages is not there, we could do 2M pages. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r--arch/x86/mm/init_64.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 122bcef..a25cc6fa 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -763,6 +763,20 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
end_pfn = end>>PAGE_SHIFT;
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
+ /* try to merge same page size and continuous */
+ for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
+ unsigned long old_start;
+ if (mr[i].end != mr[i+1].start ||
+ mr[i].page_size_mask != mr[i+1].page_size_mask)
+ continue;
+ /* move it */
+ old_start = mr[i].start;
+ memmove(&mr[i], &mr[i+1],
+ (nr_range - 1 - i) * sizeof (struct map_range));
+ mr[i].start = old_start;
+ nr_range--;
+ }
+
for (i = 0; i < nr_range; i++)
printk(KERN_DEBUG " %010lx - %010lx page %s\n",
mr[i].start, mr[i].end,
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