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Subject[PATCH 37/37] perf data: Implement 'split' subcommand
Date
The perf data split command is for splitting a (large) single data
file into multiple files under a directory (perf.data.dir by default)
so that it can be processed and reported using multiple threads.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Documentation/perf-data.txt | 28 +++++
tools/perf/builtin-data.c | 223 +++++++++++++++++++++++++++++++++
2 files changed, 251 insertions(+)

diff --git a/tools/perf/Documentation/perf-data.txt b/tools/perf/Documentation/perf-data.txt
index b8c83947715c..42708702f10c 100644
--- a/tools/perf/Documentation/perf-data.txt
+++ b/tools/perf/Documentation/perf-data.txt
@@ -13,3 +13,31 @@ SYNOPSIS
DESCRIPTION
-----------
Data file related processing.
+
+COMMANDS
+--------
+split::
+ Split single data file (perf.data) into multiple files under a directory
+ in order to be reported by multiple threads.
+
+OPTIONS for 'split'
+---------------------
+-i::
+--input::
+ Specify input perf data file path.
+
+-o::
+--output::
+ Specify output perf data directory path.
+
+-v::
+--verbose::
+ Be more verbose (show counter open errors, etc).
+
+-f::
+--force::
+ Don't complain, do it.
+
+SEE ALSO
+--------
+linkperf:perf[1], linkperf:perf-report[1]
diff --git a/tools/perf/builtin-data.c b/tools/perf/builtin-data.c
index 1eee97d020fa..5f3173826850 100644
--- a/tools/perf/builtin-data.c
+++ b/tools/perf/builtin-data.c
@@ -2,10 +2,14 @@
#include "builtin.h"
#include "perf.h"
#include "debug.h"
+#include "session.h"
+#include "evlist.h"
#include "parse-options.h"

typedef int (*data_cmd_fn_t)(int argc, const char **argv, const char *prefix);

+static const char *output_name;
+
struct data_cmd {
const char *name;
const char *summary;
@@ -41,10 +45,229 @@ static void print_usage(void)
printf("\n");
}

+static int data_cmd_split(int argc, const char **argv, const char *prefix);
+
static struct data_cmd data_cmds[] = {
+ { "split", "split single data file into multi-file", data_cmd_split },
{ NULL },
};

+#define FD_HASH_BITS 7
+#define FD_HASH_SIZE (1 << FD_HASH_BITS)
+#define FD_HASH_MASK (FD_HASH_SIZE - 1)
+
+struct data_split {
+ struct perf_tool tool;
+ struct perf_session *session;
+ enum {
+ PER_CPU,
+ PER_THREAD,
+ } mode;
+ int header_fd;
+ u64 header_written;
+ struct hlist_head fd_hash[FD_HASH_SIZE];
+ int fd_hash_nr;
+};
+
+struct fdhash_node {
+ int id;
+ int fd;
+ struct hlist_node list;
+};
+
+static struct hlist_head *get_hash(struct data_split *split, int id)
+{
+ return &split->fd_hash[id % FD_HASH_MASK];
+}
+
+static int perf_event__rewrite_header(struct perf_tool *tool,
+ union perf_event *event)
+{
+ struct data_split *split = container_of(tool, struct data_split, tool);
+ ssize_t size;
+
+ size = writen(split->header_fd, event, event->header.size);
+ if (size < 0)
+ return -errno;
+
+ split->header_written += size;
+ return 0;
+}
+
+static int split_other_events(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine __maybe_unused)
+{
+ return perf_event__rewrite_header(tool, event);
+}
+
+static int split_sample_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel __maybe_unused,
+ struct machine *machine __maybe_unused)
+{
+ struct data_split *split = container_of(tool, struct data_split, tool);
+ int id = split->mode == PER_CPU ? sample->cpu : sample->tid;
+ int fd = -1;
+ char buf[PATH_MAX];
+ struct hlist_head *head;
+ struct fdhash_node *node;
+
+ head = get_hash(split, id);
+ hlist_for_each_entry(node, head, list) {
+ if (node->id == id) {
+ fd = node->fd;
+ break;
+ }
+ }
+
+ if (fd == -1) {
+ scnprintf(buf, sizeof(buf), "%s/perf.data.%d",
+ output_name, split->fd_hash_nr++);
+
+ fd = open(buf, O_RDWR|O_CREAT|O_TRUNC, 0600);
+ if (fd < 0) {
+ pr_err("cannot open data file: %s: %m\n", buf);
+ return -1;
+ }
+
+ node = malloc(sizeof(*node));
+ if (node == NULL) {
+ pr_err("memory allocation failed\n");
+ return -1;
+ }
+
+ node->id = id;
+ node->fd = fd;
+
+ hlist_add_head(&node->list, head);
+ }
+
+ return writen(fd, event, event->header.size) > 0 ? 0 : -errno;
+}
+
+static int __data_cmd_split(struct data_split *split)
+{
+ struct perf_session *session = split->session;
+ char *output = NULL;
+ char buf[PATH_MAX];
+ u64 sample_type;
+ int header_fd;
+ int ret = -1;
+ int i;
+
+ if (!output_name) {
+ if (asprintf(&output, "%s.dir", input_name) < 0) {
+ pr_err("memory allocation failed\n");
+ return -1;
+ }
+ output_name = output;
+ }
+
+ mkdir(output_name, 0700);
+
+ /*
+ * This is necessary to write (copy) build-id table. After
+ * processing header, dsos list will contain dso which was on
+ * the original build-id table.
+ */
+ dsos__hit_all(session);
+
+ scnprintf(buf, sizeof(buf), "%s/perf.header", output_name);
+ header_fd = open(buf, O_RDWR|O_CREAT|O_TRUNC, 0600);
+ if (header_fd < 0) {
+ pr_err("cannot open header file: %s: %m\n", buf);
+ goto out;
+ }
+
+ lseek(header_fd, session->header.data_offset, SEEK_SET);
+
+ sample_type = perf_evlist__combined_sample_type(session->evlist);
+ if (sample_type & PERF_SAMPLE_CPU)
+ split->mode = PER_CPU;
+ else
+ split->mode = PER_THREAD;
+
+ pr_debug("splitting data file for %s\n",
+ split->mode == PER_CPU ? "CPUs" : "threads");
+
+ split->header_fd = header_fd;
+ perf_session__process_events(session, &split->tool);
+
+ for (i = 0; i < FD_HASH_SIZE; i++) {
+ struct fdhash_node *pos;
+ struct hlist_node *tmp;
+
+ hlist_for_each_entry_safe(pos, tmp, &split->fd_hash[i], list) {
+ hlist_del(&pos->list);
+ close(pos->fd);
+ free(pos);
+ }
+ }
+
+ session->header.data_size = split->header_written;
+ perf_session__write_header(session, session->evlist, header_fd, true);
+
+ close(header_fd);
+ ret = 0;
+out:
+ free(output);
+ return ret;
+}
+
+int data_cmd_split(int argc, const char **argv, const char *prefix __maybe_unused)
+{
+ bool force = false;
+ struct perf_session *session;
+ struct perf_data_file file = {
+ .mode = PERF_DATA_MODE_READ,
+ };
+ struct data_split split = {
+ .tool = {
+ .sample = split_sample_event,
+ .fork = split_other_events,
+ .comm = split_other_events,
+ .exit = split_other_events,
+ .mmap = split_other_events,
+ .mmap2 = split_other_events,
+ .lost = split_other_events,
+ .throttle = split_other_events,
+ .unthrottle = split_other_events,
+ },
+ };
+ const char * const split_usage[] = {
+ "perf data split [<options>]",
+ NULL
+ };
+ const struct option split_options[] = {
+ OPT_STRING('i', "input", &input_name, "file", "input file name"),
+ OPT_STRING('o', "output", &output_name, "file", "output directory name"),
+ OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
+ OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+ OPT_END()
+ };
+
+ argc = parse_options(argc, argv, split_options, split_usage, 0);
+ if (argc)
+ usage_with_options(split_usage, split_options);
+
+ file.path = input_name;
+ file.force = force;
+ session = perf_session__new(&file, false, &split.tool);
+ if (session == NULL)
+ return -1;
+
+ split.session = session;
+ symbol__init(&session->header.env);
+
+ __data_cmd_split(&split);
+
+ perf_session__delete(session);
+ return 0;
+}
+
int cmd_data(int argc, const char **argv, const char *prefix)
{
struct data_cmd *cmd;
--
2.1.3


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