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Subject[PATCH -tip v4 3/7] perf branch trace: print pid and command
Date
Provide the function to print pid and command name to
'perf branch trace'. Users can select items to print with options.
For example,
'perf branch -p trace' prints only pid,
'perf branch -ac trace' prints address and comamnd name.
'perf branch trace' prints only address (default)

This is output sample (perf branch -ac trace):
command address
ls 0xffffffff8146fe0e => 0x0000003806200b20
ls 0xffffffff8146fe0e => 0x0000003806200b20
ls 0x0000003806200b23 => 0x0000003806204910
ls 0xffffffff8146fe0e => 0x0000003806204910
ls 0xffffffff8146fe0e => 0x0000003806204936
ls 0xffffffff8146fe0e => 0x000000380620493d
ls 0x0000003806204981 => 0x00000038062049a3
ls 0x00000038062049a7 => 0x0000003806204988
Pid and command are never changed between branch_to and branch_from.
So perf branch prints them only branch_from field.

Changes in V4
- comm and pid are only printed in branch_from field
- support output tsv mode

Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@hitachi.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
---
tools/perf/Documentation/perf-branch.txt | 18 +++-
tools/perf/builtin-branch.c | 138 +++++++++++++++++++++++++++++-
2 files changed, 148 insertions(+), 8 deletions(-)
diff --git a/tools/perf/Documentation/perf-branch.txt b/tools/perf/Documentation/perf-branch.txt
index 15ee496..f3a4e13 100644
--- a/tools/perf/Documentation/perf-branch.txt
+++ b/tools/perf/Documentation/perf-branch.txt
@@ -3,7 +3,7 @@ perf-branch(1)

NAME
----
-perf-branch - Record and print branch-trace-store log
+perf-branch - Record and analyze branch-trace-store log

SYNOPSIS
--------
@@ -12,7 +12,7 @@ SYNOPSIS

DESCRIPTION
-----------
-This command records and prints a branch-trace-store log.
+This command records and analyzes a branch-trace-store log.
Branch-trace-store is a facility of processors. It can record
addresses of from/to which the execution of a program branches,
at every branch instruction and interrupt.
@@ -20,7 +20,10 @@ at every branch instruction and interrupt.
'perf branch record <command>' records branch-trace-store log while
the specified command is executing. And, save to the file "perf.data".

-'perf branch trace' parses recorded branch-trace-store log and prints it.
+'perf branch trace' analyzes recorded branch-trace-store log and prints it.
+The command can select the item to print. For example,
+ 'perf branch -a trace' : prints only address
+ 'perf branch -acp trace' : prints address, command name and pid

OPTIONS
-------
@@ -30,6 +33,15 @@ OPTIONS
-t::
--tsv::
Output TSV format.
+-a::
+--addr::
+ Print address. (default)
+-c::
+--comm::
+ Print command name.
+-p::
+--pid::
+ Print pid.

SEE ALSO
--------
diff --git a/tools/perf/builtin-branch.c b/tools/perf/builtin-branch.c
index 5b0297e..6e37c775 100644
--- a/tools/perf/builtin-branch.c
+++ b/tools/perf/builtin-branch.c
@@ -17,6 +17,45 @@
/* format string to print address */
#define FMT_ADDR "%#0" FMT_ADDR_WIDTH "lx"

+/* printable items */
+struct exec_info {
+ u64 addr; /* recorded address by bts */
+ pid_t pid; /* tracee process pid */
+ const char *comm; /* command name */
+};
+
+#define EI_PID_UNSET -1
+
+/* flags which item print */
+#define EI_FLAG_PRINT_ADDR (1 << 0)
+#define EI_FLAG_PRINT_PID (1 << 1)
+#define EI_FLAG_PRINT_COMM (1 << 2)
+
+/*
+ * It's used when no print item specified.
+ * It must be selected from EI_FLAG_REQUIRED.
+ */
+#define EI_FLAG_PRINT_DEFAULT EI_FLAG_PRINT_ADDR
+
+/* the flags must be printed at least. */
+#define EI_FLAG_REQUIRED EI_FLAG_PRINT_ADDR
+
+/*
+ * The items which are not printed in branch_to field.
+ * Currently, Pid and command are never changed between branch_to and
+ * branch_from. So, don't print them in branch_to field.
+ */
+#define EI_MASK_BRANCH_TO (~(EI_FLAG_PRINT_COMM | EI_FLAG_PRINT_PID))
+
+/* print item flags */
+static unsigned long print_flags;
+
+#define is_flags_unset(flags) ((flags) == 0)
+
+/* print it when we cannnot analyze and get the information */
+#define EI_UNKNOWN_TEXT "(unknown)"
+#define EI_UNKNOWN_TEXT_LEN (sizeof(EI_UNKNOWN_TEXT))
+
/* default input file name to analyze */
static const char *input_name = "perf.data";

@@ -24,6 +63,7 @@ static const char *input_name = "perf.data";
static bool output_tsv;
#define output_item_addr(addr) printf(output_tsv ? FMT_ADDR "\t" : \
FMT_ADDR " ", addr)
+#define output_item_str(fmt, str) printf(output_tsv ? "%s\t" : fmt, str)

static const char * const branch_usage[] = {
"perf branch [<options>] {record|trace}",
@@ -39,9 +79,26 @@ static const char * const record_args[] = {
"-d",
};

+/* set print flags call from parse_options() */
+static int set_print_flags(const struct option *opt, const char *str __unused,
+ int unset __unused)
+{
+ print_flags |= (unsigned long)opt->defval;
+ return 0;
+}
+
static const struct option branch_options[] = {
OPT_STRING('i', "input", &input_name, "file", "input file name"),
OPT_BOOLEAN('t', "tsv", &output_tsv, "output tsv format"),
+ OPT_CALLBACK_DEFAULT_NOOPT('a', "addr", NULL, NULL,
+ "print address (default)", set_print_flags,
+ (void *)EI_FLAG_PRINT_ADDR),
+ OPT_CALLBACK_DEFAULT_NOOPT('p', "pid", NULL, NULL,
+ "print pid", set_print_flags,
+ (void *)EI_FLAG_PRINT_PID),
+ OPT_CALLBACK_DEFAULT_NOOPT('c', "comm", NULL, NULL,
+ "print command name", set_print_flags,
+ (void *)EI_FLAG_PRINT_COMM),
OPT_END()
};

@@ -66,25 +123,91 @@ static bool is_bts_sample(struct perf_sample *sample,
return is_bts_event(evsel);
}

+static void init_exec_info(struct exec_info *ei)
+{
+ memset(ei, 0, sizeof(*ei));
+ ei->pid = EI_PID_UNSET;
+}
+
+/* collect printable items to struct exec_info */
+static void fill_exec_info(struct exec_info *ei,
+ struct perf_session *session, union perf_event *event, u64 addr)
+{
+ struct thread *thread;
+
+ ei->addr = addr;
+ ei->pid = event->ip.pid;
+
+ thread = perf_session__findnew(session, event->ip.pid);
+ if (!thread)
+ return;
+ ei->comm = thread->comm;
+}
+
+static void __print_exec_info(struct exec_info *ei, int ei_print_flags)
+{
+ char pid[16];
+ const char *comm;
+
+ if (ei_print_flags & EI_FLAG_PRINT_PID) {
+ if (ei->pid == EI_PID_UNSET)
+ strncpy(pid, EI_UNKNOWN_TEXT, EI_UNKNOWN_TEXT_LEN);
+ else
+ snprintf(pid, 16, "%d", ei->pid);
+ output_item_str("%5s ", pid);
+ }
+ if (ei_print_flags & EI_FLAG_PRINT_COMM) {
+ comm = ei->comm ? : EI_UNKNOWN_TEXT;
+ output_item_str("%-12s ", comm);
+ }
+ if (ei_print_flags & EI_FLAG_PRINT_ADDR)
+ output_item_addr(ei->addr);
+}
+
+static void print_exec_info(struct exec_info *ei_from, struct exec_info *ei_to)
+{
+ __print_exec_info(ei_from, print_flags);
+ if (!output_tsv)
+ printf("=> ");
+ __print_exec_info(ei_to, print_flags & EI_MASK_BRANCH_TO);
+ printf("\n");
+}
+
+static void print_exec_info_header(void)
+{
+ if (print_flags & EI_FLAG_PRINT_PID)
+ output_item_str("%5s ", "pid");
+ if (print_flags & EI_FLAG_PRINT_COMM)
+ output_item_str("%-12s ", "command");
+ if (print_flags & EI_FLAG_PRINT_ADDR)
+ output_item_str("%-" FMT_ADDR_WIDTH "s ", "address");
+ printf("\n");
+}
+
static int process_sample_event(union perf_event *event __unused,
struct perf_sample *sample, struct perf_evsel *evsel __unused,
struct perf_session *session)
{
+ struct exec_info ei_from, ei_to;
+
if (!is_bts_sample(sample, session))
return 0;

+ init_exec_info(&ei_from);
+ init_exec_info(&ei_to);
+
/* sample->ip is 'from address', sample->addr is 'to address' */
- output_item_addr(sample->ip);
- if (!output_tsv)
- printf("=> ");
- output_item_addr(sample->addr);
- printf("\n");
+ fill_exec_info(&ei_from, session, event, sample->ip);
+ fill_exec_info(&ei_to, session, event, sample->addr);
+
+ print_exec_info(&ei_from, &ei_to);

return 0;
}

static struct perf_event_ops event_ops = {
.sample = process_sample_event,
+ .comm = perf_event__process_comm,
.ordered_samples = false,
};

@@ -98,7 +221,12 @@ static int __cmd_trace(void)
return EXIT_FAILURE;
}

+ /* To avoid meaningless output, we add default printable item. */
+ if (is_flags_unset(print_flags & EI_FLAG_REQUIRED))
+ print_flags |= EI_FLAG_PRINT_DEFAULT;
+
setup_pager();
+ print_exec_info_header();
perf_session__process_events(session, &event_ops);
perf_session__delete(session);



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