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authorAlexey Starikovskiy <astarikovskiy@suse.de>2010-05-26 07:53:07 +0400
committerLen Brown <len.brown@intel.com>2010-07-07 06:33:56 +0400
commitc45b5c097001480e66d4c523eb715ad317a4ef77 (patch)
tree5b9415840b97a724537273db99b2c66975c63347 /drivers/acpi/acpica/nsaccess.c
parent5821f75421aa7c7bafdec291223153597f649934 (diff)
downloadlinux-c45b5c097001480e66d4c523eb715ad317a4ef77.tar.xz
ACPICA: Performance enhancement for namespace search and access
This change enhances the performance of namespace searches and walks by adding a backpointer to the parent in each namespace node. On large namespaces, this change can improve overall ACPI performance by up to 9X. Adding a pointer to each namespace node increases the overall size of the internal namespace by about 5%, since each namespace entry usually consists of both a namespace node and an ACPI operand object. Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/nsaccess.c')
-rw-r--r--drivers/acpi/acpica/nsaccess.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
index 2cebfa94b79a..0cd925be5fc1 100644
--- a/drivers/acpi/acpica/nsaccess.c
+++ b/drivers/acpi/acpica/nsaccess.c
@@ -338,8 +338,7 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
*/
while (!acpi_ns_opens_scope(prefix_node->type) &&
prefix_node->type != ACPI_TYPE_ANY) {
- prefix_node =
- acpi_ns_get_parent_node(prefix_node);
+ prefix_node = prefix_node->parent;
}
}
}
@@ -419,7 +418,7 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
/* Backup to the parent node */
num_carats++;
- this_node = acpi_ns_get_parent_node(this_node);
+ this_node = this_node->parent;
if (!this_node) {
/* Current scope has no parent scope */