Revert "Move xen patchset to new version's subdir."

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.25 / patches.arch / ppc64-reduce-hashtable-size-for-64k-pages.patch

diff --git a/src/patches/suse-2.6.27.25/patches.arch/ppc64-reduce-hashtable-size-for-64k-pages.patch b/src/patches/suse-2.6.27.25/patches.arch/ppc64-reduce-hashtable-size-for-64k-pages.patch
new file mode 100644 (file)
index 0000000..3e7f6ad
--- /dev/null
+++ b/src/patches/suse-2.6.27.25/patches.arch/ppc64-reduce-hashtable-size-for-64k-pages.patch
@@ -0,0 +1,44 @@
+From: Anton Blanchard <anton@samba.org>
+Subject: powerpc/mm: Reduce hashtable size when using 64kB pages
+Date:   Fri Feb 13 11:57:30 2009 +0000
+References: bnc#501160
+Patch-upstream: yes
+Git: 13870b657578bcce167978ee93dc02bf54e3beb0
+
+    powerpc/mm: Reduce hashtable size when using 64kB pages
+    
+    At the moment we size the hashtable based on 4kB pages / 2, even on a
+    64kB kernel. This results in a hashtable that is much larger than it
+    needs to be.
+    
+    Grab the real page size and size the hashtable based on that
+    
+    Note: This only has effect on non hypervisor machines.
+    
+    Signed-off-by: Anton Blanchard <anton@samba.org>
+    Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
+Acked-by: Nick Piggin <npiggin@suse.de>
+
+diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
+index 8d5b475..f5bc1b2 100644
+--- a/arch/powerpc/mm/hash_utils_64.c
++++ b/arch/powerpc/mm/hash_utils_64.c
+@@ -516,7 +516,7 @@ static int __init htab_dt_scan_pftsize(unsigned long node,
+ 
+ static unsigned long __init htab_get_table_size(void)
+ {
+-      unsigned long mem_size, rnd_mem_size, pteg_count;
++      unsigned long mem_size, rnd_mem_size, pteg_count, psize;
+ 
+       /* If hash size isn't already provided by the platform, we try to
+        * retrieve it from the device-tree. If it's not there neither, we
+@@ -534,7 +534,8 @@ static unsigned long __init htab_get_table_size(void)
+               rnd_mem_size <<= 1;
+ 
+       /* # pages / 2 */
+-      pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11);
++      psize = mmu_psize_defs[mmu_virtual_psize].shift;
++      pteg_count = max(rnd_mem_size >> (psize + 1), 1UL << 11);
+ 
+       return pteg_count << 7;
+ }