Messages in this thread Patch in this message | | | Date | Fri, 07 Nov 2008 00:23:38 -0500 | From | Mathieu Desnoyers <> | Subject | [RFC patch 02/18] get_cycles() : x86 HAVE_GET_CYCLES |
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This patch selects HAVE_GET_CYCLES and makes sure get_cycles_barrier() and get_cycles_rate() are implemented.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> CC: David Miller <davem@davemloft.net> CC: Linus Torvalds <torvalds@linux-foundation.org> CC: Andrew Morton <akpm@linux-foundation.org> CC: Ingo Molnar <mingo@redhat.com> CC: Peter Zijlstra <a.p.zijlstra@chello.nl> CC: Thomas Gleixner <tglx@linutronix.de> CC: Steven Rostedt <rostedt@goodmis.org> CC: linux-arch@vger.kernel.org --- arch/x86/Kconfig | 1 + arch/x86/include/asm/tsc.h | 12 ++++++++++++ 2 files changed, 13 insertions(+)
Index: linux.trees.git/arch/x86/Kconfig =================================================================== --- linux.trees.git.orig/arch/x86/Kconfig 2008-11-07 00:06:06.000000000 -0500 +++ linux.trees.git/arch/x86/Kconfig 2008-11-07 00:09:33.000000000 -0500 @@ -20,6 +20,7 @@ config X86 def_bool y select HAVE_AOUT if X86_32 select HAVE_UNSTABLE_SCHED_CLOCK + select HAVE_GET_CYCLES select HAVE_IDE select HAVE_OPROFILE select HAVE_IOREMAP_PROT Index: linux.trees.git/arch/x86/include/asm/tsc.h =================================================================== --- linux.trees.git.orig/arch/x86/include/asm/tsc.h 2008-10-30 20:22:50.000000000 -0400 +++ linux.trees.git/arch/x86/include/asm/tsc.h 2008-11-07 00:09:33.000000000 -0500 @@ -50,6 +50,18 @@ extern void mark_tsc_unstable(char *reas extern int unsynchronized_tsc(void); int check_tsc_unstable(void); +static inline cycles_t get_cycles_rate(void) +{ + if (check_tsc_unstable()) + return 0; + return tsc_khz; +} + +static inline void get_cycles_barrier(void) +{ + rdtsc_barrier(); +} + /* * Boot-time check whether the TSCs are synchronized across * all CPUs/cores: -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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