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7f33f9c5cc
linux/arch/x86
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Frederic Weisbecker 7f33f9c5cc x86/perf: Exclude the debug stack from the callchains 
Dumping the callchains from breakpoint events with perf gives strange
results:

3.75%             perf  [kernel]           [k] _raw_read_unlock
                       |
                       --- _raw_read_unlock
                           perf_callchain
                           perf_prepare_sample
                           __perf_event_overflow
                           perf_swevent_overflow
                           perf_swevent_add
                           perf_bp_event
                           hw_breakpoint_exceptions_notify
                           notifier_call_chain
                           __atomic_notifier_call_chain
                           atomic_notifier_call_chain
                           notify_die
                           do_debug
                           debug
                           munmap

We are infected with all the debug stack. Like the nmi stack, the debug
stack is undesired as it is part of the profiling path, not helpful for
the user.

Ignore it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
2009-12-06 08:27:21 +01:00
..
boot x86: Document linker script ASSERT() quirk 2009-10-16 07:18:46 +02:00
configs tracing: Rename FTRACE_SYSCALLS for tracepoints 2009-08-26 00:17:35 +02:00
crypto crypto: aesni-intel - Fix irq_fpu_usable usage 2009-10-20 16:20:47 +09:00
ia32 x86-64: Fix register leak in 32-bit syscall audting 2009-10-26 16:23:26 +01:00
include/asm Merge branch 'perf/mce' into perf/core 2009-12-03 20:11:06 +01:00
kernel x86/perf: Exclude the debug stack from the callchains 2009-12-06 08:27:21 +01:00
kvm Merge branch 'tracing/hw-breakpoints' into perf/core 2009-11-21 14:07:23 +01:00
lguest lguest: move panic notifier registration to its expected place. 2009-09-23 22:26:44 +09:30
lib x86: Gitignore: arch/x86/lib/inat-tables.c 2009-11-04 13:11:28 +01:00
math-emu
mm Merge branch 'tracing/hw-breakpoints' into perf/core 2009-11-21 14:07:23 +01:00
oprofile perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
pci const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
power hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf events 2009-11-08 15:34:42 +01:00
tools Merge branch 'perf/probes' into perf/core 2009-12-03 20:11:38 +01:00
vdso kbuild: rename ld-option to cc-ldoption 2009-09-20 12:27:42 +02:00
video
xen xen: mask extended topology info in cpuid 2009-11-03 11:09:12 -08:00
Kbuild
Kconfig Merge branch 'tracing/hw-breakpoints' into perf/core 2009-11-21 14:07:23 +01:00
Kconfig.cpu x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium 2009-10-26 12:33:02 +01:00
Kconfig.debug x86: X86 instruction decoder build-time selftest 2009-08-27 00:35:56 +02:00
Makefile Merge branch 'perf/core' into perf/probes 2009-11-17 10:17:47 +01:00
Makefile_32.cpu x86: add specific support for Intel Atom architecture 2009-08-23 11:20:02 +02:00