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Subject[PATCH 10/48] perf tools: Add HEADER_DATA_INDEX feature
Date
From: Namhyung Kim <namhyung@kernel.org>

The HEADER_DATA_INDEX feature is to record index table for sample data
so that they can be processed by multiple thread concurrently. Each
item is a struct perf_file_section which consists of an offset and size.

Link: http://lkml.kernel.org/n/tip-q5rh23fs1qlenc2s9fj0ug7u@git.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-record.c | 1 +
tools/perf/util/header.c | 76 +++++++++++++++++++++++++++++++++++++
tools/perf/util/header.h | 3 ++
3 files changed, 80 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5d1433f92454..b5deda2e890c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -602,6 +602,7 @@ static void record__init_features(struct record *rec)
perf_header__clear_feat(&session->header, HEADER_AUXTRACE);

perf_header__clear_feat(&session->header, HEADER_STAT);
+ perf_header__clear_feat(&session->header, HEADER_DATA_INDEX);
}

static void
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c78051ad1fcc..b097bcc35d34 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -34,6 +34,7 @@
#include "strbuf.h"
#include "build-id.h"
#include "data.h"
+#include "units.h"
#include <api/fs/fs.h>
#include "asm/bug.h"
#include "tool.h"
@@ -1417,6 +1418,25 @@ static int write_mem_topology(struct feat_fd *ff __maybe_unused,
return ret;
}

+static int write_data_index(struct feat_fd *ff,
+ struct perf_evlist *evlist __maybe_unused)
+{
+ struct perf_header *ph = ff->ph;
+ int ret;
+ unsigned int i;
+
+ ret = do_write(ff, &ph->nr_index, sizeof(ph->nr_index));
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ph->nr_index; i++) {
+ ret = do_write(ff, &ph->index[i], sizeof(*ph->index));
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
static void print_hostname(struct feat_fd *ff, FILE *fp)
{
fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
@@ -1809,6 +1829,23 @@ static void print_mem_topology(struct feat_fd *ff, FILE *fp)
}
}

+static void print_data_index(struct feat_fd *ff, FILE *fp)
+{
+ struct perf_header *ph = ff->ph;
+ unsigned int i;
+
+ fprintf(fp, "# contains data index (%lu) for parallel processing\n",
+ ph->nr_index);
+
+ for (i = 0; i < ph->nr_index; i++) {
+ struct perf_file_section *s = &ph->index[i];
+ char buf[20];
+
+ unit_number__scnprintf(buf, sizeof(buf), s->size);
+ fprintf(fp, "# %u: %s @ %lu\n", i, buf, s->offset);
+ }
+}
+
static int __event_process_build_id(struct build_id_event *bev,
char *filename,
struct perf_session *session)
@@ -2531,6 +2568,44 @@ static int process_mem_topology(struct feat_fd *ff,
return ret;
}

+static int process_data_index(struct feat_fd *ff, void *data __maybe_unused)
+{
+ struct perf_header *ph = ff->ph;
+ int fd = ff->fd;
+ ssize_t ret;
+ u64 nr_idx;
+ unsigned int i;
+ struct perf_file_section *idx;
+
+ ret = readn(fd, &nr_idx, sizeof(nr_idx));
+ if (ret != sizeof(nr_idx))
+ return -1;
+
+ if (ph->needs_swap)
+ nr_idx = bswap_64(nr_idx);
+
+ idx = calloc(nr_idx, sizeof(*idx));
+ if (idx == NULL)
+ return -1;
+
+ for (i = 0; i < nr_idx; i++) {
+ ret = readn(fd, &idx[i], sizeof(*idx));
+ if (ret != sizeof(*idx)) {
+ free(idx);
+ return -1;
+ }
+
+ if (ph->needs_swap) {
+ idx[i].offset = bswap_64(idx[i].offset);
+ idx[i].size = bswap_64(idx[i].size);
+ }
+ }
+
+ ph->index = idx;
+ ph->nr_index = nr_idx;
+ return 0;
+}
+
struct feature_ops {
int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
void (*print)(struct feat_fd *ff, FILE *fp);
@@ -2590,6 +2665,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPN(CACHE, cache, true),
FEAT_OPR(SAMPLE_TIME, sample_time, false),
FEAT_OPR(MEM_TOPOLOGY, mem_topology, true),
+ FEAT_OPN(DATA_INDEX, data_index, true),
};

struct header_print_data {
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index e17903caa71d..542a62167ecf 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -38,6 +38,7 @@ enum {
HEADER_CACHE,
HEADER_SAMPLE_TIME,
HEADER_MEM_TOPOLOGY,
+ HEADER_DATA_INDEX,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
@@ -78,6 +79,8 @@ struct perf_header {
bool needs_swap;
u64 data_offset;
u64 data_size;
+ struct perf_file_section *index;
+ u64 nr_index;
u64 feat_offset;
DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
struct perf_env env;
--
2.17.1
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