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Date: Wed, 11 Dec 2013 14:36:54 +0200
From: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
Namhyung Kim <namhyung@...il.com>,
Paul Mackerras <paulus@...ba.org>,
Stephane Eranian <eranian@...gle.com>,
Andi Kleen <ak@...ux.intel.com>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH v0 42/71] perf tools: Add support for Instruction Trace recording
From: Adrian Hunter <adrian.hunter@...el.com>
Add support for reading from the Instruction
Tracing mmap and synthesizing Instruction
Tracing events.
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
tools/perf/perf.h | 2 +
tools/perf/util/itrace.c | 190 +++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/itrace.h | 51 ++++++++++++-
tools/perf/util/record.c | 6 +-
4 files changed, 247 insertions(+), 2 deletions(-)
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index b23fed5..b68b469 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -261,8 +261,10 @@ struct perf_record_opts {
bool sample_weight;
bool sample_time;
bool period;
+ bool full_itrace;
unsigned int freq;
unsigned int mmap_pages;
+ unsigned int itrace_mmap_pages;
unsigned int user_freq;
u64 branch_stack;
u64 default_interval;
diff --git a/tools/perf/util/itrace.c b/tools/perf/util/itrace.c
index a889e63..9596cc2 100644
--- a/tools/perf/util/itrace.c
+++ b/tools/perf/util/itrace.c
@@ -24,6 +24,10 @@
#include <linux/kernel.h>
#include <linux/perf_event.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
#include "../perf.h"
#include "types.h"
#include "util.h"
@@ -32,6 +36,9 @@
#include "thread_map.h"
#include "itrace.h"
+#include "event.h"
+#include "debug.h"
+
int itrace_mmap__mmap(struct itrace_mmap *mm, struct itrace_mmap_params *mp,
int fd)
{
@@ -102,3 +109,186 @@ void itrace_mmap_params__set_idx(struct itrace_mmap_params *mp,
mp->tid = evlist->threads->map[idx];
}
}
+
+size_t itrace_record__info_priv_size(struct itrace_record *itr)
+{
+ if (itr)
+ return itr->info_priv_size(itr);
+ return 0;
+}
+
+static int itrace_not_supported(void)
+{
+ pr_err("Instruction tracing is not supported on this architecture\n");
+ return -EINVAL;
+}
+
+int itrace_record__info_fill(struct itrace_record *itr,
+ struct perf_session *session,
+ struct itrace_info_event *itrace_info,
+ size_t priv_size)
+{
+ if (itr)
+ return itr->info_fill(itr, session, itrace_info, priv_size);
+ return itrace_not_supported();
+}
+
+void itrace_record__free(struct itrace_record *itr)
+{
+ if (itr)
+ itr->free(itr);
+}
+
+int itrace_record__options(struct itrace_record *itr,
+ struct perf_evlist *evlist,
+ struct perf_record_opts *opts)
+{
+ if (itr)
+ return itr->recording_options(itr, evlist, opts);
+ return 0;
+}
+
+u64 itrace_record__reference(struct itrace_record *itr)
+{
+ if (itr)
+ return itr->reference(itr);
+ return 0;
+}
+
+struct itrace_record *__attribute__ ((weak)) itrace_record__init(int *err)
+{
+ *err = 0;
+ return NULL;
+}
+
+int perf_event__synthesize_itrace_info(struct itrace_record *itr,
+ struct perf_tool *tool,
+ struct perf_session *session,
+ perf_event__handler_t process)
+{
+ union perf_event *ev;
+ size_t priv_size;
+ int err;
+
+ pr_debug2("Synthesizing itrace information\n");
+ priv_size = itrace_record__info_priv_size(itr);
+ ev = zalloc(sizeof(struct itrace_info_event) + priv_size);
+ if (!ev)
+ return -ENOMEM;
+
+ ev->itrace_info.header.type = PERF_RECORD_ITRACE_INFO;
+ ev->itrace_info.header.size = sizeof(struct itrace_info_event) +
+ priv_size;
+ err = itrace_record__info_fill(itr, session, &ev->itrace_info,
+ priv_size);
+ if (err)
+ goto out_free;
+
+ err = process(tool, ev, NULL, NULL);
+out_free:
+ free(ev);
+ return err;
+}
+
+int perf_event__synthesize_itrace(struct perf_tool *tool,
+ perf_event__handler_t process,
+ size_t size, u64 offset, u64 ref, int idx,
+ u32 tid, u32 cpu)
+{
+ union perf_event ev;
+
+ memset(&ev, 0, sizeof(ev));
+ ev.itrace.header.type = PERF_RECORD_ITRACE;
+ ev.itrace.header.size = sizeof(ev.itrace);
+ ev.itrace.size = size;
+ ev.itrace.offset = offset;
+ ev.itrace.reference = ref;
+ ev.itrace.idx = idx;
+ ev.itrace.tid = tid;
+ ev.itrace.cpu = cpu;
+
+ return process(tool, &ev, NULL, NULL);
+}
+
+int itrace_mmap__read(struct itrace_mmap *mm, struct itrace_record *itr,
+ struct perf_tool *tool, process_itrace_t fn)
+{
+ u64 head = itrace_mmap__read_head(mm);
+ u64 old = mm->prev, offset, ref;
+ unsigned char *data = mm->base + page_size;
+ size_t size, head_off, old_off, len1, len2;
+ union perf_event ev;
+ void *data1, *data2;
+
+ if (old == head)
+ return 0;
+
+ pr_debug3("itrace idx %d old %"PRIu64" head %"PRIu64" diff %"PRIu64"\n",
+ mm->idx, old, head, head - old);
+
+ if (mm->mask) {
+ head_off = head & mm->mask;
+ old_off = old & mm->mask;
+ } else {
+ head_off = head % mm->len;
+ old_off = old % mm->len;
+ }
+
+ if (head_off > old_off)
+ size = head_off - old_off;
+ else
+ size = mm->len - (old_off - head_off);
+
+ ref = itrace_record__reference(itr);
+
+ if (head > old || size <= head || mm->mask) {
+ offset = head - size;
+ } else {
+ /*
+ * When the buffer size is not a power of 2, 'head' wraps at the
+ * highest multiple of the buffer size, so we have to subtract
+ * the remainder here.
+ */
+ u64 rem = (0ULL - mm->len) % mm->len;
+
+ offset = head - size - rem;
+ }
+
+ if (size > head_off) {
+ len1 = size - head_off;
+ data1 = &data[mm->len - len1];
+ len2 = head_off;
+ data2 = &data[0];
+ } else {
+ len1 = size;
+ data1 = &data[head_off - len1];
+ len2 = 0;
+ data2 = NULL;
+ }
+
+ memset(&ev, 0, sizeof(ev));
+ ev.itrace.header.type = PERF_RECORD_ITRACE;
+ ev.itrace.header.size = sizeof(ev.itrace);
+ ev.itrace.size = size;
+ ev.itrace.offset = offset;
+ ev.itrace.reference = ref;
+ ev.itrace.idx = mm->idx;
+ ev.itrace.tid = mm->tid;
+ ev.itrace.cpu = mm->cpu;
+
+ if (fn(tool, &ev, data1, len1, data2, len2))
+ return -1;
+
+ mm->prev = head;
+
+ itrace_mmap__write_tail(mm, head);
+ if (itr->read_finish) {
+ int err;
+
+ err = itr->read_finish(itr, mm->idx);
+ if (err < 0)
+ return err;
+ }
+
+ return 1;
+}
diff --git a/tools/perf/util/itrace.h b/tools/perf/util/itrace.h
index 4b17aca..da52a29 100644
--- a/tools/perf/util/itrace.h
+++ b/tools/perf/util/itrace.h
@@ -22,13 +22,18 @@
#include <sys/types.h>
#include <stdbool.h>
-
+#include <stddef.h>
#include <linux/perf_event.h>
#include "../perf.h"
#include "types.h"
+union perf_event;
+struct perf_session;
struct perf_evlist;
+struct perf_tool;
+struct perf_record_opts;
+struct itrace_info_event;
/**
* struct itrace_mmap - records an mmap at PERF_EVENT_ITRACE_OFFSET.
@@ -74,6 +79,20 @@ struct itrace_mmap_params {
int cpu;
};
+struct itrace_record {
+ int (*recording_options)(struct itrace_record *itr,
+ struct perf_evlist *evlist,
+ struct perf_record_opts *opts);
+ size_t (*info_priv_size)(struct itrace_record *itr);
+ int (*info_fill)(struct itrace_record *itr,
+ struct perf_session *session,
+ struct itrace_info_event *itrace_info,
+ size_t priv_size);
+ void (*free)(struct itrace_record *itr);
+ u64 (*reference)(struct itrace_record *itr);
+ int (*read_finish)(struct itrace_record *itr, int idx);
+};
+
static inline u64 itrace_mmap__read_head(struct itrace_mmap *mm)
{
struct perf_event_mmap_page *pc = mm->base;
@@ -115,4 +134,34 @@ void itrace_mmap_params__set_idx(struct itrace_mmap_params *mp,
struct perf_evlist *evlist, int idx,
bool per_cpu);
+typedef int (*process_itrace_t)(struct perf_tool *tool, union perf_event *event,
+ void *data1, size_t len1, void *data2,
+ size_t len2);
+
+int itrace_mmap__read(struct itrace_mmap *mm,
+ struct itrace_record *itr, struct perf_tool *tool,
+ process_itrace_t fn);
+
+struct itrace_record *itrace_record__init(int *err);
+
+int itrace_record__options(struct itrace_record *itr,
+ struct perf_evlist *evlist,
+ struct perf_record_opts *opts);
+size_t itrace_record__info_priv_size(struct itrace_record *itr);
+int itrace_record__info_fill(struct itrace_record *itr,
+ struct perf_session *session,
+ struct itrace_info_event *itrace_info,
+ size_t priv_size);
+void itrace_record__free(struct itrace_record *itr);
+u64 itrace_record__reference(struct itrace_record *itr);
+
+int perf_event__synthesize_itrace_info(struct itrace_record *itr,
+ struct perf_tool *tool,
+ struct perf_session *session,
+ perf_event__handler_t process);
+int perf_event__synthesize_itrace(struct perf_tool *tool,
+ perf_event__handler_t process,
+ size_t size, u64 offset, u64 ref, int idx,
+ u32 tid, u32 cpu);
+
#endif
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index e510453..86f980e 100644
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -93,7 +93,11 @@ void perf_evlist__config(struct perf_evlist *evlist,
list_for_each_entry(evsel, &evlist->entries, node)
perf_evsel__config(evsel, opts);
- if (evlist->nr_entries > 1) {
+ if (opts->full_itrace) {
+ use_sample_identifier = true;
+ list_for_each_entry(evsel, &evlist->entries, node)
+ perf_evsel__set_sample_id(evsel, use_sample_identifier);
+ } else if (evlist->nr_entries > 1) {
struct perf_evsel *first = perf_evlist__first(evlist);
list_for_each_entry(evsel, &evlist->entries, node) {
--
1.8.5.1
--
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