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Date: Fri, 03 Dec 2010 12:59:14 +0900 From: Akihiro Nagai <akihiro.nagai.hw@...achi.com> To: linux-kernel@...r.kernel.org Cc: Akihiro Nagai <akihiro.nagai.hw@...achi.com>, Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, Peter Zijlstra <peterz@...radead.org>, Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>, Arnaldo Carvalho de Melo <acme@...stprotocols.net>, linux-kernel@...r.kernel.org Subject: [PATCH -tip 3/7] perf bts: Introduce new sub command 'perf bts trace' Introduce new sub command 'perf bts trace'. This command can parse and print bts log recorded by 'perf bts record'. Usage: - First, record the bts log 'perf bts record <command>' - Second, parse and print bts log 'perf bts trace' Output: 0xffffffff8146fe0e => 0x0000003806200b20 0x0000003806200b23 => 0x0000003806204910 0xffffffff8146fe0e => 0x0000003806204910 0xffffffff8146fe0e => 0x0000003806204936 0xffffffff8146fe0e => 0x000000380620493d 0x0000003806204981 => 0x00000038062049a3 0x00000038062049a7 => 0x0000003806204988 ... Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@...achi.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Paul Mackerras <paulus@...ba.org> Cc: Ingo Molnar <mingo@...e.hu> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net> Cc: linux-kernel@...r.kernel.org --- tools/perf/Documentation/perf-bts.txt | 14 ++++++-- tools/perf/builtin-bts.c | 59 +++++++++++++++++++++++++++++++-- 2 files changed, 67 insertions(+), 6 deletions(-) diff --git a/tools/perf/Documentation/perf-bts.txt b/tools/perf/Documentation/perf-bts.txt index 55a2fe6..5920dcc 100644 --- a/tools/perf/Documentation/perf-bts.txt +++ b/tools/perf/Documentation/perf-bts.txt @@ -3,22 +3,30 @@ perf-bts(1) NAME ---- -perf-bts - Record branch-trace-store log +perf-bts - Record and print branch-trace-store log SYNOPSIS -------- [verse] -'perf bts' record <command> +'perf bts' [<options>] {record|trace} DESCRIPTION ----------- -This command can record branch-trace-store log. +This command can record and print branch-trace-store log. Branch-trace-store is a facility of processors. It can record address of branch to/from on every branch instruction and interrupt. 'perf bts record <command>' records branch-trace-store log while specified command is executing. And, save to the file "perf.data". +'perf bts trace' parses recorded branch-trace-store log and prints it. + +OPTIONS +------- +-i:: +--input=:: + Specify input file name to analyze. + SEE ALSO -------- linkperf:perf-record[1] diff --git a/tools/perf/builtin-bts.c b/tools/perf/builtin-bts.c index 587cfad..54e83af 100644 --- a/tools/perf/builtin-bts.c +++ b/tools/perf/builtin-bts.c @@ -1,10 +1,25 @@ #include "builtin.h" #include "perf.h" #include "util/parse-options.h" +#include "util/session.h" +#include "util/cache.h" +#include <inttypes.h> + +/* format string of specifying min width to print address */ +#if __WORDSIZE == 32 +#define FMT_ADDR_WIDTH "10" /* length of "0x" + 32bit address */ +#else +#define FMT_ADDR_WIDTH "18" /* length of "0x" + 64bit address */ +#endif +/* format string to print address */ +#define FMT_ADDR "%#0" FMT_ADDR_WIDTH "llx" + +/* default input file name to analyze */ +static const char *input_name = "perf.data"; static const char * const bts_usage[] = { - "perf bts record <command>", - NULL, + "perf bts [<options>] {record|trace}", + NULL }; /* arguments to call 'perf record' */ @@ -16,11 +31,45 @@ static const char * const record_args[] = { "-d", }; -/* dummy struct option to call parse_options() */ static const struct option bts_options[] = { + OPT_STRING('i', "input", &input_name, "file", "input file name"), OPT_END() }; +static int process_sample_event(event_t *event, struct perf_session *session) +{ + struct sample_data data; + + memset(&data, 0, sizeof(data)); + event__parse_sample(event, session->sample_type, &data); + + /* data.ip is 'from address', data.addr is 'to address' */ + printf(FMT_ADDR " => " FMT_ADDR "\n", data.ip, data.addr); + + return 0; +} + +static struct perf_event_ops event_ops = { + .sample = process_sample_event, + .ordered_samples = false, +}; + +static int __cmd_trace(void) +{ + struct perf_session *session; + + session = perf_session__new(input_name, O_RDONLY, 0, false); + if (!session) { + fprintf(stderr, "failed to create perf_session.\n"); + return -ENOMEM; + } + + perf_session__process_events(session, &event_ops); + perf_session__delete(session); + + return 0; +} + static int __cmd_record(int argc, const char **argv) { unsigned int rec_argc, i, j; @@ -55,6 +104,10 @@ int cmd_bts(int argc, const char **argv, const char *prefix __used) if (!strncmp(argv[0], "record", 6)) return __cmd_record(argc, argv); + else if (!strncmp(argv[0], "trace", 5)) { + setup_pager(); + return __cmd_trace(); + } else usage_with_options(bts_usage, bts_options); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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