linux/kernel/trace
Steven Rostedt a8fb260805 perf/tracing: Fix regression of perf losing kprobe events
With the addition of the code to shrink the kernel tracepoint
infrastructure, we lost kprobes being traced by perf. The reason
is that I tested if the "tp_event->class->perf_probe" existed before
enabling it. This prevents "ftrace only" events (like the function
trace events) from being enabled by perf.

Unfortunately, kprobe events do not use perf_probe. This causes
kprobes to be missed by perf. To fix this, we add the test to
see if "tp_event->class->reg" exists as well as perf_probe.

Normal trace events have only "perf_probe" but no "reg" function,
and kprobes and syscalls have the "reg" but no "perf_probe".
The ftrace unique events do not have either, so this is a valid
test. If a kprobe or syscall is not to be probed by perf, the
"reg" function is called anyway, and will return a failure and
prevent perf from probing it.

Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-06-10 20:56:54 -04:00
..
Kconfig x86, perf, bts, mm: Delete the never used BTS-ptrace code 2010-03-26 11:33:55 +01:00
Makefile x86, perf, bts, mm: Delete the never used BTS-ptrace code 2010-03-26 11:33:55 +01:00
blktrace.c blktrace: Fix new kernel-doc warnings 2010-05-31 09:58:20 +02:00
ftrace.c Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:35:04 -07:00
kmemtrace.c tracing: Allow events to share their print functions 2010-05-14 14:20:32 -04:00
power-traces.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ring_buffer.c ring-buffer: Move zeroing out excess in page to ring buffer code 2010-05-25 11:57:26 -04:00
ring_buffer_benchmark.c ring-buffer: Make benchmark handle missed events 2010-04-27 13:26:58 -04:00
trace.c Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-30 12:35:01 -07:00
trace.h Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:35:04 -07:00
trace_boot.c
trace_branch.c tracing: Allow events to share their print functions 2010-05-14 14:20:32 -04:00
trace_clock.c tracing: Fix lockdep warning in global_clock() 2010-03-29 15:16:44 -04:00
trace_entries.h x86, perf, bts, mm: Delete the never used BTS-ptrace code 2010-03-26 11:33:55 +01:00
trace_event_perf.c perf/tracing: Fix regression of perf losing kprobe events 2010-06-10 20:56:54 -04:00
trace_events.c tracing: Combine event filter_active and enable into single flags field 2010-05-14 14:33:22 -04:00
trace_events_filter.c Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip into trace/tip/tracing/core-6 2010-05-18 00:35:23 -04:00
trace_export.c tracing: Remove duplicate id information in event structure 2010-05-14 14:33:15 -04:00
trace_functions.c
trace_functions_graph.c tracing: Allow events to share their print functions 2010-05-14 14:20:32 -04:00
trace_irqsoff.c tracing: Add graph output support for irqsoff tracer 2010-04-27 12:36:53 -04:00
trace_kprobe.c perf_events, trace: Fix probe unregister race 2010-05-31 08:46:09 +02:00
trace_ksym.c hw-breakpoints: Get the number of available registers on boot dynamically 2010-05-01 04:32:14 +02:00
trace_mmiotrace.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
trace_nop.c
trace_output.c Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-27 15:23:47 -07:00
trace_output.h tracing: Allow events to share their print functions 2010-05-14 14:20:32 -04:00
trace_printk.c
trace_sched_switch.c tracing: Let tracepoints have data passed to tracepoint callbacks 2010-05-14 09:50:34 -04:00
trace_sched_wakeup.c tracing: Let tracepoints have data passed to tracepoint callbacks 2010-05-14 09:50:34 -04:00
trace_selftest.c Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:35:04 -07:00
trace_selftest_dynamic.c
trace_stack.c
trace_stat.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
trace_stat.h
trace_syscalls.c perf_events, trace: Fix probe unregister race 2010-05-31 08:46:09 +02:00
trace_sysprof.c
trace_workqueue.c tracing: Let tracepoints have data passed to tracepoint callbacks 2010-05-14 09:50:34 -04:00