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authorRobert Richter <robert.richter@amd.com>2011-10-11 17:11:08 +0200
committerRobert Richter <robert.richter@amd.com>2011-11-04 16:27:18 +0100
commitdcfce4a095932e6e95d83ad982be3609947963bc (patch)
tree2808b7cbdb57deab25cc1cd847fd0f9ffa058f92 /kernel/events
parent75c43a20b220f885c39ffa7cdbbb1191e257a9a9 (diff)
downloadop-kernel-dev-dcfce4a095932e6e95d83ad982be3609947963bc.zip
op-kernel-dev-dcfce4a095932e6e95d83ad982be3609947963bc.tar.gz
oprofile, x86: Reimplement nmi timer mode using perf event
The legacy x86 nmi watchdog code was removed with the implementation of the perf based nmi watchdog. This broke Oprofile's nmi timer mode. To run nmi timer mode we relied on a continuous ticking nmi source which the nmi watchdog provided. The nmi tick was no longer available and current watchdog can not be used anymore since it runs with very long periods in the range of seconds. This patch reimplements the nmi timer mode using a perf counter nmi source. V2: * removing pr_info() * fix undefined reference to `__udivdi3' for 32 bit build * fix section mismatch of .cpuinit.data:nmi_timer_cpu_nb * removed nmi timer setup in arch/x86 * implemented function stubs for op_nmi_init/exit() * made code more readable in oprofile_init() V3: * fix architectural initialization in oprofile_init() * fix CONFIG_OPROFILE_NMI_TIMER dependencies Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index d1a1bee..d2e28bd 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1322,6 +1322,7 @@ retry:
}
raw_spin_unlock_irq(&ctx->lock);
}
+EXPORT_SYMBOL_GPL(perf_event_disable);
static void perf_set_shadow_time(struct perf_event *event,
struct perf_event_context *ctx,
@@ -1806,6 +1807,7 @@ retry:
out:
raw_spin_unlock_irq(&ctx->lock);
}
+EXPORT_SYMBOL_GPL(perf_event_enable);
int perf_event_refresh(struct perf_event *event, int refresh)
{
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