From 23e8ec0d1c410f2f1d81050ee155db229abb1707 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Wed, 7 Oct 2009 18:28:30 -0400 Subject: perf probe: Add perf probe command support without libdwarf Enables 'perf probe' even if libdwarf is not installed. If libdwarf is not found, 'perf probe' just disables dwarf support. Users can use 'perf probe' to set up new events by using kprobe_events format. Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Arnaldo Carvalho de Melo Cc: Steven Rostedt Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Christoph Hellwig Cc: Ananth N Mavinakayanahalli Cc: Jim Keniston Cc: Frank Ch. Eigler LKML-Reference: <20091007222830.1684.25665.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Frederic Weisbecker --- tools/perf/builtin-probe.c | 42 +++++++++++++++++++++++++++++++++++------- 1 file changed, 35 insertions(+), 7 deletions(-) (limited to 'tools/perf/builtin-probe.c') diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c index 24b64b5cefce..73c883b715cc 100644 --- a/tools/perf/builtin-probe.c +++ b/tools/perf/builtin-probe.c @@ -54,6 +54,7 @@ const char *default_search_path[NR_SEARCH_PATH] = { static struct { char *vmlinux; char *release; + int need_dwarf; int nr_probe; struct probe_point probes[MAX_PROBES]; char *events[MAX_PROBES]; @@ -162,6 +163,8 @@ static int parse_probepoint(const struct option *opt __used, pp->function, pp->file, pp->offset); } free(argv[1]); + if (pp->file) + session.need_dwarf = 1; /* Copy arguments */ pp->nr_args = argc - 2; @@ -173,15 +176,19 @@ static int parse_probepoint(const struct option *opt __used, } /* Ensure return probe has no C argument */ - if (retp) - for (i = 0; i < pp->nr_args; i++) - if (is_c_varname(pp->args[i])) + for (i = 0; i < pp->nr_args; i++) + if (is_c_varname(pp->args[i])) { + if (retp) semantic_error("You can't specify local" " variable for kretprobe"); + session.need_dwarf = 1; + } + debug("%d arguments\n", pp->nr_args); return 0; } +#ifndef NO_LIBDWARF static int open_default_vmlinux(void) { struct utsname uts; @@ -209,6 +216,7 @@ static int open_default_vmlinux(void) } return fd; } +#endif static const char * const probe_usage[] = { "perf probe [] -P 'PROBEDEF' [-P 'PROBEDEF' ...]", @@ -216,10 +224,16 @@ static const char * const probe_usage[] = { }; static const struct option options[] = { +#ifndef NO_LIBDWARF OPT_STRING('k', "vmlinux", &session.vmlinux, "file", "vmlinux/module pathname"), +#endif OPT_CALLBACK('P', "probe", NULL, +#ifdef NO_LIBDWARF + "p|r:[GRP/]NAME FUNC[+OFFS] [ARG ...]", +#else "p|r:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]", +#endif "probe point definition, where\n" "\t\tp:\tkprobe probe\n" "\t\tr:\tkretprobe probe\n" @@ -227,9 +241,13 @@ static const struct option options[] = { "\t\tNAME:\tEvent name\n" "\t\tFUNC:\tFunction name\n" "\t\tOFFS:\tOffset from function entry (in byte)\n" +#ifdef NO_LIBDWARF + "\t\tARG:\tProbe argument (only \n" +#else "\t\tSRC:\tSource code path\n" "\t\tLINE:\tLine number\n" "\t\tARG:\tProbe argument (local variable name or\n" +#endif "\t\t\tkprobe-tracer argument format is supported.)\n", parse_probepoint), OPT_END() @@ -279,7 +297,7 @@ error: int cmd_probe(int argc, const char **argv, const char *prefix __used) { - int i, j, fd, ret, need_dwarf = 0; + int i, j, fd, ret; struct probe_point *pp; char buf[MAX_CMDLEN]; @@ -288,12 +306,19 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used) if (argc || session.nr_probe == 0) usage_with_options(probe_usage, options); - /* Synthesize return probes */ +#ifdef NO_LIBDWARF + if (session.need_dwarf) + semantic_error("Dwarf-analysis is not supported"); +#endif + + /* Synthesize probes without dwarf */ for (j = 0; j < session.nr_probe; j++) { +#ifndef NO_LIBDWARF if (session.events[j][0] != 'r') { - need_dwarf = 1; + session.need_dwarf = 1; continue; } +#endif ret = synthesize_probepoint(&session.probes[j]); if (ret == -E2BIG) semantic_error("probe point is too long."); @@ -303,7 +328,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used) } } - if (!need_dwarf) +#ifndef NO_LIBDWARF + if (!session.need_dwarf) goto setup_probes; if (session.vmlinux) @@ -332,6 +358,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used) close(fd); setup_probes: +#endif /* !NO_LIBDWARF */ + /* Settng up probe points */ snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path); fd = open(buf, O_WRONLY, O_APPEND); -- cgit v1.2.3