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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: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Masami 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2016-06-15 12:28:40 +09:00 committed by Arnaldo Carvalho de Melo
parent dd975497ad
commit 2fd457a345
4 changed files with 15 additions and 0 deletions
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4
tools/perf/Documentation/perf-probe.txt
View File

@ -109,6 +109,10 @@ OPTIONS
Dry run. With this option, --add and --del doesn't execute actual Dry run. With this option, --add and --del doesn't execute actual
adding and removal operations. 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:: --max-probes=NUM::
Set the maximum number of probe points for an event. Default is 128. Set the maximum number of probe points for an event. Default is 128.

1
tools/perf/builtin-probe.c
View File

@ -512,6 +512,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
"Enable symbol demangling"), "Enable symbol demangling"),
OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel, OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
"Enable kernel symbol demangling"), "Enable kernel symbol demangling"),
OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
OPT_END() OPT_END()
}; };
int ret; int ret;

9
tools/perf/util/probe-event.c
View File

@ -2514,6 +2514,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
{ {
int i, fd, ret; int i, fd, ret;
struct probe_trace_event *tev = NULL; struct probe_trace_event *tev = NULL;
struct probe_cache *cache = NULL;
struct strlist *namelist; struct strlist *namelist;
fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0)); 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) if (ret == -EINVAL && pev->uprobes)
warn_uprobe_event_compat(tev); 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); strlist__delete(namelist);
close_out: close_out:

1
tools/perf/util/probe-event.h
View File

@ -12,6 +12,7 @@ struct probe_conf {
bool show_location_range; bool show_location_range;
bool force_add; bool force_add;
bool no_inlines; bool no_inlines;
bool cache;
int max_probes; int max_probes;
}; };
extern struct probe_conf probe_conf; extern struct probe_conf probe_conf;