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Date: Fri, 6 May 2016 14:28:14 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Chris Phlipot <cphlipot0@...il.com>, jolsa@...nel.org,
acme@...nel.org, peterz@...radead.org, mingo@...hat.com
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] perf script: expose usage of the callchain db export
via the python api
On 28/04/16 11:19, Chris Phlipot wrote:
> This change allows python scripts to be able to utilize the recent
> changes to the db export api allowing the export of call_paths derived
> from sampled callchains. These call paths are also now associated with
> the samples from which they were derived.
>
> -This feature is enabled by setting "perf_db_export_callchains" to true
>
> -When enabled, samples that have callchain information will have the
> callchains exported via call_path_table
>
> -The call_path_id field is added to sample_table to enable association of
> samples with the corresponding callchain stored in the call paths
> table. A call_path_id of 0 will be exported if there is no
> corresponding callchain.
>
> -When "perf_db_export_callchains" and "perf_db_export_calls" are both
> set to True, the call path root data structure will be shared. This
> prevents duplicating of data and call path ids that would result from
> building two separate call path trees in memory.
>
> -The call_return_processor structure definition was relocated to the header
> file to make its contents visible to db-export.c. This enables the
> sharing of call path trees between the two features, as mentioned
> above.
>
> This change is visible to python scripts using the python db export api.
> The change is backwards compatible with scripts written against the
> previous API, assuming that the scripts model the sample_table function
> after the one in export-to-postgresql.py script by allowing for additional
> arguments to be added in the future. ie. using *x as the final argument of
> the sample_table function.
>
> Signed-off-by: Chris Phlipot <cphlipot0@...il.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
> .../util/scripting-engines/trace-event-python.c | 35 ++++++++++++++++++++--
> tools/perf/util/thread-stack.c | 13 --------
> tools/perf/util/thread-stack.h | 14 ++++++++-
> 3 files changed, 46 insertions(+), 16 deletions(-)
>
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index 7bb8592..091bce6 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -682,7 +682,7 @@ static int python_export_sample(struct db_export *dbe,
> struct tables *tables = container_of(dbe, struct tables, dbe);
> PyObject *t;
>
> - t = tuple_new(21);
> + t = tuple_new(22);
>
> tuple_set_u64(t, 0, es->db_id);
> tuple_set_u64(t, 1, es->evsel->db_id);
> @@ -705,6 +705,7 @@ static int python_export_sample(struct db_export *dbe,
> tuple_set_u64(t, 18, es->sample->data_src);
> tuple_set_s32(t, 19, es->sample->flags & PERF_BRANCH_MASK);
> tuple_set_s32(t, 20, !!(es->sample->flags & PERF_IP_FLAG_IN_TX));
> + tuple_set_u64(t, 21, es->call_path_id);
>
> call_object(tables->sample_handler, t, "sample_table");
>
> @@ -999,8 +1000,10 @@ static void set_table_handlers(struct tables *tables)
> {
> const char *perf_db_export_mode = "perf_db_export_mode";
> const char *perf_db_export_calls = "perf_db_export_calls";
> - PyObject *db_export_mode, *db_export_calls;
> + const char *perf_db_export_callchains = "perf_db_export_callchains";
> + PyObject *db_export_mode, *db_export_calls, *db_export_callchains;
> bool export_calls = false;
> + bool export_callchains = false;
> int ret;
>
> memset(tables, 0, sizeof(struct tables));
> @@ -1017,6 +1020,7 @@ static void set_table_handlers(struct tables *tables)
> if (!ret)
> return;
>
> + /* handle export calls */
> tables->dbe.crp = NULL;
> db_export_calls = PyDict_GetItemString(main_dict, perf_db_export_calls);
> if (db_export_calls) {
> @@ -1034,6 +1038,33 @@ static void set_table_handlers(struct tables *tables)
> Py_FatalError("failed to create calls processor");
> }
>
> + /* handle export callchains */
> + tables->dbe.cpr = NULL;
> + db_export_callchains = PyDict_GetItemString(main_dict,
> + perf_db_export_callchains);
> + if (db_export_callchains) {
> + ret = PyObject_IsTrue(db_export_callchains);
> + if (ret == -1)
> + handler_call_die(perf_db_export_callchains);
> + export_callchains = !!ret;
> + }
> +
> + if (export_callchains) {
> + /*
> + * Attempt to use the call path root from the call return
> + * processor, if the call return processor is in use. Otherwise,
> + * we allocate a new call path root. This prevents exporting
> + * duplicate call path ids when both are in use simultaniously.
> + */
> + if (tables->dbe.crp)
> + tables->dbe.cpr = tables->dbe.crp->cpr;
> + else
> + tables->dbe.cpr = call_path_root__new();
> +
> + if (!tables->dbe.cpr)
> + Py_FatalError("failed to create calls processor");
> + }
> +
> tables->db_export_mode = true;
> /*
> * Reserve per symbol space for symbol->db_id via symbol__priv()
> diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
> index fc419a5..825086a 100644
> --- a/tools/perf/util/thread-stack.c
> +++ b/tools/perf/util/thread-stack.c
> @@ -25,19 +25,6 @@
> #include "call-path.h"
> #include "thread-stack.h"
>
> -/**
> - * struct call_return_processor - provides a call-back to consume call-return
> - * information.
> - * @cpr: call path root
> - * @process: call-back that accepts call/return information
> - * @data: anonymous data for call-back
> - */
> -struct call_return_processor {
> - struct call_path_root *cpr;
> - int (*process)(struct call_return *cr, void *data);
> - void *data;
> -};
> -
> #define STACK_GROWTH 2048
>
> /**
> diff --git a/tools/perf/util/thread-stack.h b/tools/perf/util/thread-stack.h
> index ec9bedd..ad44c79 100644
> --- a/tools/perf/util/thread-stack.h
> +++ b/tools/perf/util/thread-stack.h
> @@ -25,7 +25,6 @@ struct comm;
> struct ip_callchain;
> struct symbol;
> struct dso;
> -struct call_return_processor;
> struct comm;
> struct perf_sample;
> struct addr_location;
> @@ -68,6 +67,19 @@ struct call_return {
> u32 flags;
> };
>
> +/**
> + * struct call_return_processor - provides a call-back to consume call-return
> + * information.
> + * @cpr: call path root
> + * @process: call-back that accepts call/return information
> + * @data: anonymous data for call-back
> + */
> +struct call_return_processor {
> + struct call_path_root *cpr;
> + int (*process)(struct call_return *cr, void *data);
> + void *data;
> +};
> +
> int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
> u64 to_ip, u16 insn_len, u64 trace_nr);
> void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr);
>
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