Messages in this thread Patch in this message | | | From | Akihiro Nagai <> | Subject | [PATCH -tip v4 3/7] perf branch trace: print pid and command | Date | Thu, 26 May 2011 14:03:16 +0900 |
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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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