commit c3d8c1414573be8cf7c8fdc1e076935697c7f6af
author Christoph Lameter <christoph@scalex86.org> Tue Sep 06 15:16:33 2005 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> Wed Sep 07 16:57:18 2005 -0700
tree bd2fc21473e03fbbf5c1182ee584b68ebfd8b1cf
parent b3dbb4ecd46767b621df3dedd28788da93ee0cac

[PATCH] More __read_mostly variables

Move some more frequently read variables that showed up during some of our
performance tests as sometimes ending up in hot cachelines to the
read_mostly section.

Fix: Move the __read_mostly from before hpet_usec_quotient to follow the
variable like the other uses of __read_mostly.

Signed-off-by: Alok N Kataria <alokk@calsoftinc.com>
Signed-off-by: Christoph Lameter <christoph@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index 4043194..bb43340 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -61,7 +61,7 @@
 
 int sysctl_overcommit_memory = OVERCOMMIT_GUESS;  /* heuristic overcommit */
 int sysctl_overcommit_ratio = 50;	/* default is 50% */
-int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT;
+int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
 atomic_t vm_committed_space = ATOMIC_INIT(0);
 
 /*

mm/page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b06a963..34bba8f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -42,11 +42,11 @@
  * MCD - HACK: Find somewhere to initialize this EARLY, or make this
  * initializer cleaner
  */
-nodemask_t node_online_map = { { [0] = 1UL } };
+nodemask_t node_online_map __read_mostly = { { [0] = 1UL } };
 EXPORT_SYMBOL(node_online_map);
-nodemask_t node_possible_map = NODE_MASK_ALL;
+nodemask_t node_possible_map __read_mostly = NODE_MASK_ALL;
 EXPORT_SYMBOL(node_possible_map);
-struct pglist_data *pgdat_list;
+struct pglist_data *pgdat_list __read_mostly;
 unsigned long totalram_pages;
 unsigned long totalhigh_pages;
 long nr_swap_pages;
@@ -68,7 +68,7 @@
  * Used by page_zone() to look up the address of the struct zone whose
  * id is encoded in the upper bits of page->flags
  */
-struct zone *zone_table[1 << ZONETABLE_SHIFT];
+struct zone *zone_table[1 << ZONETABLE_SHIFT] __read_mostly;
 EXPORT_SYMBOL(zone_table);
 
 static char *zone_names[MAX_NR_ZONES] = { "DMA", "Normal", "HighMem" };