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Date: Thu, 23 Jul 2015 13:06:58 +0800 From: Lv Zheng <lv.zheng@...el.com> To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Len Brown <len.brown@...el.com> Cc: Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>, <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org Subject: [PATCH 3/4] ACPI / Documentation: Update method tracing documentation. This patch updates method tracing documentation. Signed-off-by: Lv Zheng <lv.zheng@...el.com> --- Documentation/acpi/method-tracing.txt | 53 ++++++++++++++++++++++++--------- 1 file changed, 39 insertions(+), 14 deletions(-) diff --git a/Documentation/acpi/method-tracing.txt b/Documentation/acpi/method-tracing.txt index f6efb1e..c77f91c 100644 --- a/Documentation/acpi/method-tracing.txt +++ b/Documentation/acpi/method-tracing.txt @@ -1,26 +1,51 @@ /sys/module/acpi/parameters/: trace_method_name - The AML method name that the user wants to trace + The full path of the AML method that the user wants to use with the + "method"/"method-once" tracing mode. + Note that the full path shouldn't contain the trailing "_"s in its + name segments but should contain "\" to form an absolute path. trace_debug_layer - The temporary debug_layer used when tracing the method. - Using 0xffffffff by default if it is 0. + The temporary debug_layer used when the tracing feature is enabled. + Using ACPI_EXECUTER (0x80) by default. trace_debug_level - The temporary debug_level used when tracing the method. - Using 0x00ffffff by default if it is 0. + The temporary debug_level used when the tracing feature is enabled. + Using ACPI_LV_TRACE_POINT (0x10) by default. trace_state The status of the tracing feature. - "enabled" means this feature is enabled - and the AML method is traced every time it's executed. + Users can enable/disable this debug tracing feature by executing + the following command: + # echo string > /sys/module/acpi/parameters/trace_state + Where "string" should be one of the followings: + "disable" + Disable the tracing feature. + "enable" + Enable the tracing feature. + ACPICA debugging messages matching + "trace_debug_layer/trace_debug_level" during any method + execution will be logged. + "method" + Enable the tracing feature. + ACPICA debugging messages matching + "trace_debug_layer/trace_debug_level" during method execution + of "trace_method_name" will be logged. + "method-once" + Enable the tracing feature. + ACPICA debugging messages matching + "trace_debug_layer/trace_debug_level" during method execution + of "trace_method_name" will be logged only once. + "opcode" + Enable the tracing feature. + ACPICA debugging messages matching + "trace_debug_layer/trace_debug_level" during method/opcode + execution of "trace_method_name" will be logged. + "opcode-once" + Enable the tracing feature. + ACPICA debugging messages matching + "trace_debug_layer/trace_debug_level" during method/opcode + execution of "trace_method_name" will be logged only once. - "1" means this feature is enabled and the AML method - will only be traced during the next execution. - - "disabled" means this feature is disabled. - Users can enable/disable this debug tracing feature by - "echo string > /sys/module/acpi/parameters/trace_state". - "string" should be one of "enable", "disable" and "1". -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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