From 53938551c827d2016912ae5a431a7dad76c2426a Mon Sep 17 00:00:00 2001 From: Chao Guan Date: Wed, 19 Dec 2012 05:37:53 +0000 Subject: [PATCH] ACPICA: Performance enhancement for ACPI package objects. This change greatly increases the performance of package objects within the interpreter. It changes the processing of reference counts for packages by optimizing for the most common case where the package subobjects are either integers, strings, or buffers. Increases the performance of the ASLTS test suite by 1.5X. Chao Guan. ACPICA BZ 943. https://www.acpica.org/bugzilla/show_bug.cgi?id=943 Signed-off-by: Chao Guan Signed-off-by: Bob Moore Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/utdelete.c | 42 +++++++++++++++++++++++++++++++++--------- 1 file changed, 33 insertions(+), 9 deletions(-) diff --git a/drivers/acpi/acpica/utdelete.c b/drivers/acpi/acpica/utdelete.c index 7981054..e806fb0 100644 --- a/drivers/acpi/acpica/utdelete.c +++ b/drivers/acpi/acpica/utdelete.c @@ -530,18 +530,42 @@ acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action) */ for (i = 0; i < object->package.count; i++) { /* - * Push each element onto the stack for later processing. - * Note: There can be null elements within the package, - * these are simply ignored + * Null package elements are legal and can be simply + * ignored. */ - status = - acpi_ut_create_update_state_and_push - (object->package.elements[i], action, - &state_list); - if (ACPI_FAILURE(status)) { - goto error_exit; + next_object = object->package.elements[i]; + if (!next_object) { + continue; + } + + switch (next_object->common.type) { + case ACPI_TYPE_INTEGER: + case ACPI_TYPE_STRING: + case ACPI_TYPE_BUFFER: + /* + * For these very simple sub-objects, we can just + * update the reference count here and continue. + * Greatly increases performance of this operation. + */ + acpi_ut_update_ref_count(next_object, + action); + break; + + default: + /* + * For complex sub-objects, push them onto the stack + * for later processing (this eliminates recursion.) + */ + status = + acpi_ut_create_update_state_and_push + (next_object, action, &state_list); + if (ACPI_FAILURE(status)) { + goto error_exit; + } + break; } } + next_object = NULL; break; case ACPI_TYPE_BUFFER_FIELD: -- 2.7.4