[PATCH 0/3] perfcounter: callchain symbol resolving and fixes

[Frederic Weisbecker <fweisbec@gmail.com>]

Hi,

This patchset provides the symbol resolving for callchains.
Example:

perf report -s sym -c

5.40%  [k] __d_lookup
             3.60%
                __d_lookup
                perf_callchain
                perf_counter_overflow
                intel_pmu_handle_irq
                perf_counter_nmi_handler
                notifier_call_chain
                atomic_notifier_call_chain
                notify_die
                do_nmi
                nmi
                do_lookup
                __link_path_walk
                path_walk
                do_path_lookup
                user_path_at
                vfs_fstatat
                vfs_lstat
                sys_newlstat
                system_call_fastpath
                __lxstat
                0x406fb1

             1.26%
                __d_lookup
                perf_callchain
                perf_counter_overflow
                intel_pmu_handle_irq
                perf_counter_nmi_handler
                notifier_call_chain
                atomic_notifier_call_chain
                notify_die
                do_nmi
                nmi
                do_lookup
                __link_path_walk
                path_walk
                do_path_lookup
                user_path_at
                vfs_fstatat
                vfs_lstat
                sys_newlstat
                system_call_fastpath
                __lxstat
[...]

Sorry about the third patch, it's a kind of all-in-one monolithic thing which
gathers various fixes. I should have granulate it...

Still in my plans:

- profit we have a tree to display a better graph hierarchy
- let the user provide a limit for hit percentage, depth, number of
  backtraces, etc...
- better output
- colors

And another one:

- remove the perfcounter internal nmi call frame (ie: every nmi frame)
  so that we drop this header from each callchain:

                perf_callchain
                perf_counter_overflow
                intel_pmu_handle_irq
                perf_counter_nmi_handler
                notifier_call_chain
                atomic_notifier_call_chain
                notify_die
                do_nmi
                nmi

Frederic.

Frederic Weisbecker (3):
  perfcounter: Fix storage size allocation of callchain list
  perfcounter: Resolve symbols in callchains
  perfcounter: Various fixes for callchains

 tools/perf/builtin-report.c |  102 ++++++++++++++++++++++-----------
 tools/perf/util/callchain.c |  131 ++++++++++++++++++++++++++++++++-----------
 tools/perf/util/callchain.h |    5 +-
 3 files changed, 168 insertions(+), 70 deletions(-)