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Message-ID: <alpine.DEB.2.00.0903231446020.3578@gandalf.stny.rr.com> Date: Mon, 23 Mar 2009 14:46:27 -0400 (EDT) From: Steven Rostedt <rostedt@...dmis.org> To: Frederic Weisbecker <fweisbec@...il.com> cc: Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] tracing/function-graph-tracer: don't profile branches on graph tracer On Sun, 22 Mar 2009, Frederic Weisbecker wrote: > Impact: fix slow tracing > > The core kernel tracing is protected against soft branch profiling, but > not the x86 ftrace arch part. Let's fix it. > > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> > --- > arch/x86/kernel/Makefile | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile > index 599e9a7..8d9b3f9 100644 > --- a/arch/x86/kernel/Makefile > +++ b/arch/x86/kernel/Makefile > @@ -13,6 +13,7 @@ CFLAGS_REMOVE_rtc.o = -pg > CFLAGS_REMOVE_paravirt-spinlocks.o = -pg > CFLAGS_REMOVE_ftrace.o = -pg > CFLAGS_REMOVE_early_printk.o = -pg > +CFLAGS_ftrace.o += -DDISABLE_BRANCH_PROFILING > endif > Actually, I prefer not to do this. I do use the branch profiling on ftrace, to see where the hot paths are. -- Steve -- 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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