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Date: Mon, 05 Mar 2012 10:16:44 +0900
From: Namhyung Kim <namhyung.kim@....com>
To: linux-kernel@...r.kernel.org
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
Andrew Morton <akpm@...ux-foundation.org>,
Vasiliy Kulikov <segoon@...nwall.com>,
Stephen Wilson <wilsons@...rt.ca>,
Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Andi Kleen <ak@...ux.intel.com>,
Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
"Rafael J. Wysocki" <rjw@...k.pl>,
Frederic Weisbecker <fweisbec@...il.com>,
David Ahern <dsahern@...il.com>,
Namhyung Kim <namhyung@...il.com>,
Robert Richter <robert.richter@....com>,
linux-kernel@...r.kernel.org, sonnyrao@...omium.org,
olofj@...omium.org, eranian@...gle.com
Subject: Re: [PATCH] perf: add PERF_RECORD_EXEC type, to distinguish from
PERF_RECORD_COMM (DO NOT APPLY)
Hi,
2012-03-03 4:30 AM, Luigi Semenzato wrote:
> ---- NOT FINISHED - NOT TESTED ---- rfc only
>
> I agree with others that adding a new record type is the cleanest solution.
> This is more or less what it takes to add a new record type. It may be
> more than we like but that's a separate problem. I am open to other
> solutions. I may be able to do a bit of refactoring to reduce the
> copy-paste, but of course the CL will grow as the refactoring would
> not be limited to COMM and EXEC.
>
> ---- actual commit message below ----
>
> Currently the kernel produces a PERF_RECORD_COMM type record both when
> a process execs and when it renames its "comm" name. The "perf report"
> command interprets each COMM record as an exec, and flushes all
> mappings to executables when it encounters one. This can result in the
> inability to correlate IP samples to function symbols.
>
> This CL adds a PERF_RECORD_EXEC type, which doesn't contain the process
> name (the comm field). Thus, an exec now must send two records, one EXEC
> and one COMM, whereas a rename sends only a COMM.
>
> The change is mostly straightforward, but there are some complications
> in the synthesized events sent when "perf record" starts to account for
> existing processes.
>
> Signed-off-by: Luigi Semenzato <semenzato@...omium.org>
I got a build failure after applying it. It seems you missed something like below.
> ---
> fs/exec.c | 1 +
> include/linux/perf_event.h | 19 +++++-
> kernel/events/core.c | 153 +++++++++++++++++++++++++++++++++++++++++---
> tools/perf/builtin-test.c | 24 ++-----
> tools/perf/builtin-top.c | 5 +-
> tools/perf/util/event.c | 148 +++++++++++++++++++++++++++++-------------
> tools/perf/util/event.h | 11 +++
> tools/perf/util/evsel.c | 5 +-
> tools/perf/util/python.c | 42 +++++++++++-
> tools/perf/util/session.c | 11 +++
> tools/perf/util/thread.c | 1 -
> tools/perf/util/tool.h | 1 +
> 12 files changed, 338 insertions(+), 83 deletions(-)
>
[snip]
...
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index e3c63ae..98a3cdf 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -869,8 +869,9 @@ static void perf_top__start_counters(struct perf_top *top)
> if (symbol_conf.use_callchain)
> attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
>
> - attr->mmap = 1;
> - attr->comm = 1;
> + attr->exec_bit = 1;
> + attr->comm_bit = 1;
> + attr->mmap_bit = 1;
s/_bit/_attr/
> attr->inherit = top->inherit;
> fallback_missing_features:
> if (top->exclude_guest_missing)
[snip]
...
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 302d49a..84f59c7 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -127,8 +127,9 @@ void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts)
> attr->wakeup_events = 1;
> }
>
> - attr->mmap = track;
> - attr->comm = track;
> + attr->exec_bit = track;
> + attr->comm_bit = track;
> + attr->mmap_bit = track;
Ditto.
>
> if (!opts->target_pid&& !opts->target_tid&& !opts->system_wide) {
> attr->disabled = 1;
> diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
> index e03b58a..000b48c 100644
> --- a/tools/perf/util/python.c
> +++ b/tools/perf/util/python.c
> @@ -156,6 +156,33 @@ static PyTypeObject pyrf_comm_event__type = {
> .tp_repr = (reprfunc)pyrf_comm_event__repr,
> };
>
> +static char pyrf_exec_event__doc[] = PyDoc_STR("perf exec event object.");
> +
> +static PyMemberDef pyrf_exec_event__members[] = {
> + sample_members
> + member_def(perf_event_header, type, T_UINT, "event type"),
> + member_def(exec_event, pid, T_UINT, "event pid"),
> + member_def(exec_event, tid, T_UINT, "event tid"),
> + { .name = NULL, },
> +};
> +
> +static PyObject *pyrf_exec_event__repr(struct pyrf_event *pevent)
> +{
> + return PyString_FromFormat("{ type: exec, pid: %u, tid: %u }",
> + pevent->event.exec.pid,
> + pevent->event.exec.tid);
> +}
> +
> +static PyTypeObject pyrf_exec_event__type = {
> + PyVarObject_HEAD_INIT(NULL, 0)
> + .tp_name = "perf.exec_event",
> + .tp_basicsize = sizeof(struct pyrf_event),
> + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
> + .tp_doc = pyrf_exec_event__doc,
> + .tp_members = pyrf_exec_event__members,
> + .tp_repr = (reprfunc)pyrf_exec_event__repr,
> +};
> +
> static char pyrf_throttle_event__doc[] = PyDoc_STR("perf throttle event object.");
>
> static PyMemberDef pyrf_throttle_event__members[] = {
> @@ -306,6 +333,9 @@ static int pyrf_event__setup_types(void)
> err = PyType_Ready(&pyrf_comm_event__type);
> if (err< 0)
> goto out;
> + err = PyType_Ready(&pyrf_exec_event__type);
> + if (err< 0)
> + goto out;
> err = PyType_Ready(&pyrf_throttle_event__type);
> if (err< 0)
> goto out;
> @@ -323,6 +353,7 @@ static PyTypeObject *pyrf_event__type[] = {
> [PERF_RECORD_MMAP] =&pyrf_mmap_event__type,
> [PERF_RECORD_LOST] =&pyrf_lost_event__type,
> [PERF_RECORD_COMM] =&pyrf_comm_event__type,
> + [PERF_RECORD_EXEC] =&pyrf_exec_event__type,
> [PERF_RECORD_EXIT] =&pyrf_task_event__type,
> [PERF_RECORD_THROTTLE] =&pyrf_throttle_event__type,
> [PERF_RECORD_UNTHROTTLE] =&pyrf_throttle_event__type,
> @@ -524,6 +555,7 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel,
> "precise_ip",
> "mmap_data",
> "sample_id_all",
> + "exec",
> "wakeup_events",
> "bp_type",
> "bp_addr",
> @@ -548,7 +580,8 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel,
> watermark = 0,
> precise_ip = 0,
> mmap_data = 0,
> - sample_id_all = 1;
> + sample_id_all = 1,
> + exec = 0;
> int idx = 0;
>
> if (!PyArg_ParseTupleAndKeywords(args, kwargs,
- "|iKiKKiiiiiiiiiiiiiiiiiiiiiKK", kwlist,
+ "|iKiKKiiiiiiiiiiiiiiiiiiiiiiKK", kwlist,
&attr.type, &attr.config, &attr.sample_freq,
&sample_period, &attr.sample_type,
&attr.read_format, &disabled, &inherit,
> @@ -561,6 +594,7 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel,
> &mmap,&comm,&freq,&inherit_stat,
> &enable_on_exec,&task,&watermark,
> &precise_ip,&mmap_data,&sample_id_all,
> + &exec,
> &attr.wakeup_events,&attr.bp_type,
> &attr.bp_addr,&attr.bp_len,&idx))
> return -1;
@@ -581,8 +615,8 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel,
attr.exclude_kernel = exclude_kernel;
attr.exclude_hv = exclude_hv;
attr.exclude_idle = exclude_idle;
- attr.mmap = mmap;
- attr.comm = comm;
+ attr.mmap_attr = mmap;
+ attr.comm_attr = comm;
attr.freq = freq;
attr.inherit_stat = inherit_stat;
attr.enable_on_exec = enable_on_exec;
@@ -591,6 +625,7 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel,
attr.precise_ip = precise_ip;
attr.mmap_data = mmap_data;
attr.sample_id_all = sample_id_all;
+ attr.exec_attr = exec;
perf_evsel__init(&pevsel->evsel, &attr, idx);
return 0;
> @@ -733,10 +767,11 @@ static PyObject *pyrf_evlist__poll(struct pyrf_evlist *pevlist,
> }
>
> static PyObject *pyrf_evlist__get_pollfd(struct pyrf_evlist *pevlist,
> - PyObject *args __used, PyObject *kwargs __used)
> + PyObject *args __used,
> + PyObject *kwargs __used)
> {
> struct perf_evlist *evlist =&pevlist->evlist;
> - PyObject *list = PyList_New(0);
> + PyObject *list = PyList_New(0);
> int i;
>
> for (i = 0; i< evlist->nr_fds; ++i) {
> @@ -987,6 +1022,7 @@ static struct {
> { "RECORD_MMAP", PERF_RECORD_MMAP },
> { "RECORD_LOST", PERF_RECORD_LOST },
> { "RECORD_COMM", PERF_RECORD_COMM },
> + { "RECORD_EXEC", PERF_RECORD_EXEC },
> { "RECORD_EXIT", PERF_RECORD_EXIT },
> { "RECORD_THROTTLE", PERF_RECORD_THROTTLE },
> { "RECORD_UNTHROTTLE", PERF_RECORD_UNTHROTTLE },
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 9f833cf..a0bff02 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -343,6 +343,8 @@ static void perf_tool__fill_defaults(struct perf_tool *tool)
> tool->mmap = process_event_stub;
> if (tool->comm == NULL)
> tool->comm = process_event_stub;
> + if (tool->exec == NULL)
> + tool->exec = process_event_stub;
> if (tool->fork == NULL)
> tool->fork = process_event_stub;
> if (tool->exit == NULL)
> @@ -394,6 +396,12 @@ static void perf_event__comm_swap(union perf_event *event)
> event->comm.tid = bswap_32(event->comm.tid);
> }
>
> +static void perf_event__exec_swap(union perf_event *event)
> +{
> + event->exec.pid = bswap_32(event->exec.pid);
> + event->exec.tid = bswap_32(event->exec.tid);
> +}
> +
> static void perf_event__mmap_swap(union perf_event *event)
> {
> event->mmap.pid = bswap_32(event->mmap.pid);
> @@ -464,6 +472,7 @@ typedef void (*perf_event__swap_op)(union perf_event *event);
> static perf_event__swap_op perf_event__swap_ops[] = {
> [PERF_RECORD_MMAP] = perf_event__mmap_swap,
> [PERF_RECORD_COMM] = perf_event__comm_swap,
> + [PERF_RECORD_EXEC] = perf_event__exec_swap,
> [PERF_RECORD_FORK] = perf_event__task_swap,
> [PERF_RECORD_EXIT] = perf_event__task_swap,
> [PERF_RECORD_LOST] = perf_event__all64_swap,
> @@ -805,6 +814,8 @@ static int perf_session_deliver_event(struct perf_session *session,
> return tool->mmap(tool, event, sample, machine);
> case PERF_RECORD_COMM:
> return tool->comm(tool, event, sample, machine);
> + case PERF_RECORD_EXEC:
> + return tool->exec(tool, event, sample, machine);
> case PERF_RECORD_FORK:
> return tool->fork(tool, event, sample, machine);
> case PERF_RECORD_EXIT:
--
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