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| author | Yinghai Lu <yhlu.kernel@gmail.com> | 2008-07-12 14:32:45 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-13 08:19:16 +0200 |
| commit | 9958e810f8ac92f8a447035ee6555420ba27b847 (patch) | |
| tree | 1761a7d04aebeb9b345ea8e2b74abd555a9c3926 /arch | |
| parent | 965194c15dc9e4f3bc44432b39c441c86af7f11d (diff) | |
| download | op-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')
| -rw-r--r-- | arch/x86/mm/init_64.c | 14 |
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, |
