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Date: Sun, 15 May 2016 12:22:23 +0900 From: Masami Hiramatsu <mhiramat@...nel.org> To: Arnaldo Carvalho de Melo <acme@...nel.org> Cc: Masami Hiramatsu <mhiramat@...nel.org>, linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Hemant Kumar <hemant@...ux.vnet.ibm.com>, Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>, Brendan Gregg <brendan.d.gregg@...il.com> Subject: [PATCH perf/core v8 16/16] perf probe: Support a special SDT probe format Support a special SDT probe format which can omit the '%' prefix only if the SDT group name starts with "sdt_". So, for example both of "%sdt_libc:setjump" and "sdt_libc:setjump" are acceptable for perf probe --add. Suggested-by: Brendan Gregg <brendan.d.gregg@...il.com> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org> --- tools/perf/Documentation/perf-probe.txt | 4 +++- tools/perf/util/probe-event.c | 12 ++++++++++-- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt index 43523be..2ebde8b 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt @@ -152,7 +152,9 @@ Probe points are defined by following syntax. [[GROUP:]EVENT=]SRC;PTN [ARG ...] 4) Pre-defined SDT events - %[PROVIDER:]SDTEVENT + %[sdt_PROVIDER:]SDTEVENT + or, + sdt_PROVIDER:SDTEVENT 'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. You can also specify a group name by 'GROUP', if omitted, set 'probe' is used for kprobe and 'probe_<bin>' is used for uprobe. Note that using existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide embedded events in the diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index bd31cac..a4819f9 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -1245,9 +1245,17 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) if (!arg) return -EINVAL; - if (arg[0] == '%') { + /* + * If the probe point starts with '%', + * or starts with "sdt_" and has a ':' but no '=', + * then it should be a SDT/cached probe point. + */ + if (arg[0] == '%' || + (!strncmp(arg, "sdt_", 4) && + !!strchr(arg, ':') && !strchr(arg, '='))) { pev->sdt = true; - arg++; + if (arg[0] == '%') + arg++; } ptr = strpbrk(arg, ";=@+%");
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