diff options
| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2011-03-16 19:04:15 -0400 |
|---|---|---|
| committer | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2011-03-16 19:04:15 -0400 |
| commit | 2adb27366f7d337eb7a41298842c6d3d8987e603 (patch) | |
| tree | d997c3ec8db8396120c733a26e3782d99d22ef61 /init | |
| parent | c9aeb4561dbf10ec1d69d91947a24f7ba8de83e8 (diff) | |
trace-clock/trace-clock-generic
Trace clock generic
Wrapper to use the lower level clock sources available on the systems. Fall-back
on a counter incremented by a timer interrupt every jiffy or'd with a logical
clock for architectures lacking CPU timestamp counters.
A generic fallback based on a logical clock and the timer interrupt is
available.
generic - Uses jiffies or'd with a logical clock extended to 64 bits by
trace-clock-32-to-64.
i386 - Uses TSC. If detects non synchronized TSC, uses mixed TSC-logical clock.
mips - Uses TSC extended atomically from 32 to 64 bits by trace-clock-32-to-64.
powerpc - Uses TSC.
sparc64 - Uses TSC.
x86_64 - Uses TSC. If detects non synchronized TSC, uses mixed TSC-logical clock
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Ralf Baechle <ralf@linux-mips.org>
CC: benh@kernel.crashing.org
CC: paulus@samba.org
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
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index a95327d11bb..f56ad689d02 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -699,6 +699,12 @@ config HAVE_GET_CYCLES config HAVE_TRACE_CLOCK def_bool n +config HAVE_TRACE_CLOCK_GENERIC + bool + default y if (!HAVE_TRACE_CLOCK) + default n if HAVE_TRACE_CLOCK + select HAVE_TRACE_CLOCK_32_TO_64 if (!64BIT) + # # Architectures with only a 32-bits clock source should select this. # |