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authorCyrill Gorcunov <gorcunov@openvz.org>2011-07-09 00:17:12 +0400
committerSteven Rostedt <rostedt@goodmis.org>2011-07-15 01:25:04 +0400
commitf91298709790b9a483752ca3c967845537df2af3 (patch)
treef7392e3d37b9aa78ef04bdf89bc0d45d2db401e3 /kernel/watchdog.c
parent4a9bd3f134decd6d16ead8d288342d57aad486be (diff)
downloadlinux-f91298709790b9a483752ca3c967845537df2af3.tar.xz
perf, x86: P4 PMU - Introduce event alias feature
Instead of hw_nmi_watchdog_set_attr() weak function and appropriate x86_pmu::hw_watchdog_set_attr() call we introduce even alias mechanism which allow us to drop this routines completely and isolate quirks of Netburst architecture inside P4 PMU code only. The main idea remains the same though -- to allow nmi-watchdog and perf top run simultaneously. Note the aliasing mechanism applies to generic PERF_COUNT_HW_CPU_CYCLES event only because arbitrary event (say passed as RAW initially) might have some additional bits set inside ESCR register changing the behaviour of event and we can't guarantee anymore that alias event will give the same result. P.S. Thanks a huge to Don and Steven for for testing and early review. Acked-by: Don Zickus <dzickus@redhat.com> Tested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> CC: Ingo Molnar <mingo@elte.hu> CC: Peter Zijlstra <a.p.zijlstra@chello.nl> CC: Stephane Eranian <eranian@google.com> CC: Lin Ming <ming.m.lin@intel.com> CC: Arnaldo Carvalho de Melo <acme@redhat.com> CC: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20110708201712.GS23657@sun Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/watchdog.c')
-rw-r--r--kernel/watchdog.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index a933e3a0398b..36491cd5b7d4 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -200,7 +200,6 @@ static int is_softlockup(unsigned long touch_ts)
}
#ifdef CONFIG_HARDLOCKUP_DETECTOR
-void __weak hw_nmi_watchdog_set_attr(struct perf_event_attr *wd_attr) { }
static struct perf_event_attr wd_hw_attr = {
.type = PERF_TYPE_HARDWARE,
@@ -372,7 +371,6 @@ static int watchdog_nmi_enable(int cpu)
wd_attr = &wd_hw_attr;
wd_attr->sample_period = hw_nmi_get_sample_period(watchdog_thresh);
- hw_nmi_watchdog_set_attr(wd_attr);
/* Try to register using hardware perf events */
event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback, NULL);