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Commit 2fd457a3 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Arnaldo Carvalho de Melo
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perf probe: Add --cache option to cache the probe definitions 



Add --cache option to cache the probe definitions. This just saves the
result of the dwarf analysis to probe cache.

Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160615032840.31330.44412.stgit@devbox


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent dd975497

tools/perf/Documentation/perf-probe.txt

+4 −0
Original line number Diff line number Diff line
@@ -109,6 +109,10 @@ OPTIONS 
	Dry run. With this option, --add and --del doesn't execute actual

	adding and removal operations.



--cache::

	Cache the probes (with --add option). Any events which successfully added

	are also stored in the cache file.



--max-probes=NUM::

	Set the maximum number of probe points for an event. Default is 128.

tools/perf/builtin-probe.c

+1 −0
Original line number Diff line number Diff line
@@ -512,6 +512,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused) 
		    "Enable symbol demangling"),

	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,

		    "Enable kernel symbol demangling"),

	OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),

	OPT_END()

	};

	int ret;

tools/perf/util/probe-event.c

+9 −0
Original line number Diff line number Diff line
@@ -2514,6 +2514,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev, 
{

	int i, fd, ret;

	struct probe_trace_event *tev = NULL;

	struct probe_cache *cache = NULL;

	struct strlist *namelist;



	fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
@@ -2555,6 +2556,14 @@ static int __add_probe_trace_events(struct perf_probe_event *pev, 
	}

	if (ret == -EINVAL && pev->uprobes)

		warn_uprobe_event_compat(tev);

	if (ret == 0 && probe_conf.cache) {

		cache = probe_cache__new(pev->target);

		if (!cache ||

		    probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||

		    probe_cache__commit(cache) < 0)

			pr_warning("Failed to add event to probe cache\n");

		probe_cache__delete(cache);

	}



	strlist__delete(namelist);

close_out:

tools/perf/util/probe-event.h

+1 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ struct probe_conf { 
	bool	show_location_range;

	bool	force_add;

	bool	no_inlines;

	bool	cache;

	int	max_probes;

};

extern struct probe_conf probe_conf;