svn commit: r195632 - head/sys/powerpc/aim

[Nathan Whitehorn]

Author: nwhitehorn
Date: Sun Jul 12 04:07:52 2009
New Revision: 195632
URL: http://svn.freebsd.org/changeset/base/195632

Log:
  Increase the size of the page table on 64-bit PowerPC machines as a
  bandaid to prevent exhaustion of the primary and secondary hash groups
  in the event of extreme stress on the PMAP layer (e.g. a forkbomb). This
  wastes memory, and should be revised to properly handle PTEG spills instead.
  
  Suggested by:	grehan
  Approved by:	re (kensmith)

Modified:
  head/sys/powerpc/aim/mmu_oea64.c

Modified: head/sys/powerpc/aim/mmu_oea64.c
==============================================================================
--- head/sys/powerpc/aim/mmu_oea64.c	Sun Jul 12 03:53:52 2009	(r195631)
+++ head/sys/powerpc/aim/mmu_oea64.c	Sun Jul 12 04:07:52 2009	(r195632)
@@ -781,8 +781,6 @@ moea64_bridge_bootstrap(mmu_t mmup, vm_o
 
 	while (moea64_pteg_count < physmem)
 		moea64_pteg_count <<= 1;
-
-	moea64_pteg_count >>= 1;
 #endif /* PTEGCOUNT */
 
 	size = moea64_pteg_count * sizeof(struct lpteg);