From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@gmail.com (Catalin Marinas) Date: Sat, 6 Nov 2010 19:06:28 +0000 Subject: [PATCH 6/6] ARM: ftrace: enable function graph tracer In-Reply-To: <1289067954-5080-6-git-send-email-rabin@rab.in> References: <1289067954-5080-1-git-send-email-rabin@rab.in> <1289067954-5080-6-git-send-email-rabin@rab.in> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Saturday, November 6, 2010, Rabin Vincent wrote: > Add the options to enable the function graph tracer on ARM. ?Function > graph tracer support requires frame pointers, so exclude Thumb-2 and > also explicitly select FRAME_POINTER in FUNCTION_GRAPH_TRACER since > FUNCTION_TRACER doesn't select FRAME_POINTER when ARM_UNWIND is used > Therefore, with GCC 4.4.0+, you get plain function tracing without frame > pointers, but you'll need them if you want function graph tracing. ..... > --- a/kernel/trace/Kconfig > +++ b/kernel/trace/Kconfig > @@ -141,6 +141,7 @@ config FUNCTION_TRACER > > ?config FUNCTION_GRAPH_TRACER > ? ? ? ?bool "Kernel Function Graph Tracer" > + ? ? ? select FRAME_POINTER if ARM_UNWIND Would it be better to modify FRAME_POINTER definition in the ARM Kconfig so that it is enabled automatically when FUNCTION_GRAPH_TRACER is enabled? -- Catalin