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Red Hat Bugzilla – Attachment 311875 Details for
Bug 455504
Backport of don't use large pages to map the first 2/4MB of memory form 2.6.26 to RHEL5-U3
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[patch]
Patch to use 4KB pages for first 2MB of kernel space.
rhel5u3-meminit.patch (text/plain), 968 bytes, created by
Larry Woodman
on 2008-07-15 19:26:47 UTC
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Description:
Patch to use 4KB pages for first 2MB of kernel space.
Filename:
MIME Type:
Creator:
Larry Woodman
Created:
2008-07-15 19:26:47 UTC
Size:
968 bytes
patch
obsolete
>--- linux-2.6.18.noarch/arch/i386/mm/init.c.orig 2008-07-15 15:09:05.000000000 -0400 >+++ linux-2.6.18.noarch/arch/i386/mm/init.c 2008-07-15 15:09:08.000000000 -0400 >@@ -162,8 +162,13 @@ static void __init kernel_physical_mappi > for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_idx++) { > unsigned int address = pfn * PAGE_SIZE + PAGE_OFFSET; > >- /* Map with big pages if possible, otherwise create normal page tables. */ >- if (cpu_has_pse) { >+ /* Map with big pages if possible, otherwise create normal page tables. >+ * Don't use a large page for the first 2/4MB of memory >+ * because there are often fixed size MTRRs in there >+ * and overlapping MTRRs into large pages can cause >+ * slowdowns. >+ */ >+ if (cpu_has_pse && !(pgd_idx == 0 && pmd_idx == 0)) { > unsigned int address2 = (pfn + PTRS_PER_PTE - 1) * PAGE_SIZE + PAGE_OFFSET + PAGE_SIZE-1; > > if (is_kernel_text(address) || is_kernel_text(address2))
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