On 28/04/16 11:19, Chris Phlipot wrote: > The exported sample now contains a reference to the call_path_id that > represents its callchain. > > While callchains themselves are nice to have, being able to associate > them with samples makes them much more useful, and can allow for such > things as determining how much cumulative time is spent in a particular > function. This information is normally possible to get from the > call return processor. However, when doing normal sampling, call/return > information is not available, thus necessitating the need for associating > samples directly with call paths. > > This commit include changes to db-export layer to make this information > available for subsequent patches in this change set, but by itself, does > not make any changes visible to the user. > > Signed-off-by: Chris Phlipot <[email protected]>
Acked-by: Adrian Hunter <[email protected]> > --- > tools/perf/util/db-export.c | 4 +++- > tools/perf/util/db-export.h | 1 + > 2 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c > index cb96591..74f6875 100644 > --- a/tools/perf/util/db-export.c > +++ b/tools/perf/util/db-export.c > @@ -412,8 +412,10 @@ int db_export__sample(struct db_export *dbe, union > perf_event *event, > struct call_path *cp = call_path_from_sample(dbe, al->machine, > thread, sample, > evsel); > - if (cp) > + if (cp) { > db_export__call_path(dbe, cp); > + es.call_path_id = cp->db_id; > + } > } > > if ((evsel->attr.sample_type & PERF_SAMPLE_ADDR) && > diff --git a/tools/perf/util/db-export.h b/tools/perf/util/db-export.h > index f5daf55..67bc6b8 100644 > --- a/tools/perf/util/db-export.h > +++ b/tools/perf/util/db-export.h > @@ -44,6 +44,7 @@ struct export_sample { > u64 addr_dso_db_id; > u64 addr_sym_db_id; > u64 addr_offset; /* addr offset from symbol start */ > + u64 call_path_id; > }; > > struct db_export { >
