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Date: Fri, 22 Oct 2010 21:13:11 +0200
From: Frederic Weisbecker <fweisbec@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Paul Mackerras <paulus@...ba.org>,
Stephane Eranian <eranian@...gle.com>,
Cyrill Gorcunov <gorcunov@...nvz.org>,
Tom Zanussi <tzanussi@...il.com>,
Masami Hiramatsu <mhiramat@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Robert Richter <robert.richter@....com>,
"Frank Ch. Eigler" <fche@...hat.com>
Subject: [RFC PATCH 10/11] perf: Support user regs and stack in sample parsing
This will be needed for stack unwinding.
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Tom Zanussi <tzanussi@...il.com>
Cc: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Robert Richter <robert.richter@....com>
Cc: Frank Ch. Eigler <fche@...hat.com>
---
tools/perf/builtin-kmem.c | 2 +-
tools/perf/builtin-lock.c | 2 +-
tools/perf/builtin-sched.c | 2 +-
tools/perf/builtin-timechart.c | 2 +-
tools/perf/builtin-trace.c | 2 +-
tools/perf/util/event.c | 28 ++++++++++++++++++++++++++--
tools/perf/util/event.h | 15 ++++++++++++++-
tools/perf/util/header.c | 33 +++++++++++++++++++++++++++++++--
tools/perf/util/header.h | 3 ++-
tools/perf/util/session.c | 4 ++--
tools/perf/util/session.h | 6 ++++++
11 files changed, 86 insertions(+), 13 deletions(-)
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 31f60a2..2fee906 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -314,7 +314,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
data.cpu = -1;
data.period = 1;
- event__parse_sample(event, session->sample_type, &data);
+ event__parse_sample(event, session, &data);
dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld\n", event->header.misc,
data.pid, data.tid, data.ip, data.period);
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 821c158..5791a25 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -840,7 +840,7 @@ static int process_sample_event(event_t *self, struct perf_session *s)
struct thread *thread;
bzero(&data, sizeof(data));
- event__parse_sample(self, s->sample_type, &data);
+ event__parse_sample(self, s, &data);
thread = perf_session__findnew(s, data.tid);
if (thread == NULL) {
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 55f3b5d..5ef6075 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1619,7 +1619,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
data.cpu = -1;
data.period = -1;
- event__parse_sample(event, session->sample_type, &data);
+ event__parse_sample(event, session, &data);
dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld\n", event->header.misc,
data.pid, data.tid, data.ip, data.period);
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 9bcc38f..7d752d5 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -477,7 +477,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
memset(&data, 0, sizeof(data));
- event__parse_sample(event, session->sample_type, &data);
+ event__parse_sample(event, session, &data);
if (session->sample_type & PERF_SAMPLE_TIME) {
if (!first_time || first_time > data.time)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 40a6a29..224c586 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -74,7 +74,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
data.cpu = -1;
data.period = 1;
- event__parse_sample(event, session->sample_type, &data);
+ event__parse_sample(event, session, &data);
dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld\n", event->header.misc,
data.pid, data.tid, data.ip, data.period);
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index dab9e75..567f97a 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -676,7 +676,7 @@ int event__preprocess_sample(const event_t *self, struct perf_session *session,
u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
struct thread *thread;
- event__parse_sample(self, session->sample_type, data);
+ event__parse_sample(self, session, data);
dump_printf("(IP, %d): %d/%d: %#Lx period: %Ld cpu:%d\n",
self->header.misc, data->pid, data->tid, data->ip,
@@ -766,9 +766,11 @@ out_filtered:
return 0;
}
-int event__parse_sample(const event_t *event, u64 type, struct sample_data *data)
+int event__parse_sample(const event_t *event, struct perf_session *session,
+ struct sample_data *data)
{
const u64 *array = event->sample.array;
+ u64 type = session->sample_type;
if (type & PERF_SAMPLE_IP) {
data->ip = event->ip.ip;
@@ -830,6 +832,28 @@ int event__parse_sample(const event_t *event, u64 type, struct sample_data *data
data->raw_size = *p;
p++;
data->raw_data = p;
+ array += 1 + (data->raw_size * sizeof(u64));
+ }
+
+ if (session->sample_uregs_nr) {
+ data->uregs.version = *array++;
+
+ if (data->uregs.version) {
+ data->uregs.regs = (u64 *)array;
+ array += session->sample_uregs_nr;
+ }
+ }
+
+ if (session->sample_ustack) {
+ u64 size = *array++;
+
+ if (!size) {
+ data->stack.size = 0;
+ } else {
+ data->stack.data = (char *)array;
+ array += size / sizeof(*array);
+ data->stack.size = *array;
+ }
}
return 0;
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 8e790da..5a05396 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -61,6 +61,16 @@ struct sample_event {
u64 array[];
};
+struct user_regs {
+ u64 version;
+ u64 *regs;
+};
+
+struct user_stack_dump {
+ u64 size;
+ char *data;
+};
+
struct sample_data {
u64 ip;
u32 pid, tid;
@@ -73,6 +83,8 @@ struct sample_data {
u32 raw_size;
void *raw_data;
struct ip_callchain *callchain;
+ struct user_regs uregs;
+ struct user_stack_dump stack;
};
#define BUILD_ID_SIZE 20
@@ -160,7 +172,8 @@ struct addr_location;
int event__preprocess_sample(const event_t *self, struct perf_session *session,
struct addr_location *al, struct sample_data *data,
symbol_filter_t filter);
-int event__parse_sample(const event_t *event, u64 type, struct sample_data *data);
+int event__parse_sample(const event_t *event, struct perf_session *session,
+ struct sample_data *data);
extern const char *event__name[];
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index d7e67b1..b73f481 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -922,9 +922,26 @@ out_errno:
return -errno;
}
-u64 perf_header__sample_type(struct perf_header *header)
+static int regs_weight(u64 user_regs)
+{
+ int i, bits = 0;
+
+ for (i = 0; i < (int)sizeof(u64) * 8 && user_regs; i++) {
+ if (user_regs & 1)
+ bits++;
+
+ user_regs >>= 1;
+ }
+
+ return bits;
+}
+
+void perf_header__sample_type(struct perf_header *header,
+ struct perf_session *session)
{
u64 type = 0;
+ u64 uregs = 0;
+ int uregs_nr = 0, ustack = false;
int i;
for (i = 0; i < header->attrs; i++) {
@@ -934,9 +951,21 @@ u64 perf_header__sample_type(struct perf_header *header)
type = attr->attr.sample_type;
else if (type != attr->attr.sample_type)
die("non matching sample_type");
+
+ if (i == 0) {
+ uregs = attr->attr.user_regs;
+ uregs_nr = regs_weight(uregs);
+ ustack = !!attr->attr.ustack_dump_size;
+ } else if (uregs != attr->attr.user_regs ||
+ ustack != !!attr->attr.ustack_dump_size) {
+ die("non matching sample_type");
+ }
}
- return type;
+ session->sample_type = type;
+ session->sample_uregs = uregs;
+ session->sample_uregs_nr = uregs_nr;
+ session->sample_ustack = ustack;
}
struct perf_event_attr *
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 402ac24..6ec6af2 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -80,7 +80,8 @@ void perf_header_attr__delete(struct perf_header_attr *self);
int perf_header_attr__add_id(struct perf_header_attr *self, u64 id);
-u64 perf_header__sample_type(struct perf_header *header);
+void perf_header__sample_type(struct perf_header *header,
+ struct perf_session *session);
struct perf_event_attr *
perf_header__find_attr(u64 id, struct perf_header *header);
void perf_header__set_feat(struct perf_header *self, int feat);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index fa9d652..f0e427e 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -67,7 +67,7 @@ out_close:
void perf_session__update_sample_type(struct perf_session *self)
{
- self->sample_type = perf_header__sample_type(&self->header);
+ perf_header__sample_type(&self->header, self);
}
int perf_session__create_kernel_maps(struct perf_session *self)
@@ -576,7 +576,7 @@ static int perf_session__process_sample(event_t *event, struct perf_session *s,
return ops->sample(event, s);
bzero(&data, sizeof(struct sample_data));
- event__parse_sample(event, s->sample_type, &data);
+ event__parse_sample(event, s, &data);
queue_sample_event(event, &data, s);
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 9fa0fc2..ab9ebbc 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -39,6 +39,12 @@ struct perf_session {
*/
struct hists hists;
u64 sample_type;
+ u64 sample_uregs;
+ /* We should probably use a quick hweight64() in sample_uregs to get
+ * this instead of storing it.
+ */
+ int sample_uregs_nr;
+ bool sample_ustack;
int fd;
bool fd_pipe;
bool repipe;
--
1.6.2.3
--
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