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perf probe: Support glob wildcards for function name

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Support glob wildcards for function name when adding new probes. This
will allow us to build caches of function-entry level information with
$params.

e.g.
  ----
  # perf probe --no-inlines --add 'kmalloc* $params'
  Added new events:
    probe:kmalloc_slab   (on kmalloc* with $params)
    probe:kmalloc_large_node (on kmalloc* with $params)
    probe:kmalloc_order_trace (on kmalloc* with $params)

  You can now use it in all perf tools, such as:

        perf record -e probe:kmalloc_order_trace -aR sleep 1

  # perf probe --list
    probe:kmalloc_large_node (on kmalloc_large_node@mm/slub.c with size flags node)
    probe:kmalloc_order_trace (on kmalloc_order_trace@mm/slub.c with size flags order)
    probe:kmalloc_slab   (on kmalloc_slab@mm/slab_common.c with size flags)
  ----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150508010335.24812.19972.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2015-05-08 10:03:35 +09:00 • committed by Arnaldo Carvalho de Melo
parent 6cfd1f6805
commit 4c85935122
6 changed files with 59 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

19
tools/perf/util/probe-event.c
View file

@ -589,7 +589,11 @@ static int post_process_probe_trace_events(struct probe_trace_event *tevs,
if (!tmp)
return -ENOMEM;
}
free(tevs[i].point.symbol);
/* If we have no realname, use symbol for it */
if (!tevs[i].point.realname)
tevs[i].point.realname = tevs[i].point.symbol;
else
free(tevs[i].point.symbol);
tevs[i].point.symbol = tmp;
tevs[i].point.offset = tevs[i].point.address -
reloc_sym->unrelocated_addr;
@ -1900,6 +1904,7 @@ static void clear_probe_trace_event(struct probe_trace_event *tev)
free(tev->event);
free(tev->group);
free(tev->point.symbol);
free(tev->point.realname);
free(tev->point.module);
for (i = 0; i < tev->nargs; i++) {
free(tev->args[i].name);
@ -2377,6 +2382,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
struct strlist *namelist;
LIST_HEAD(blacklist);
struct kprobe_blacklist_node *node;
bool safename;
if (pev->uprobes)
fd = open_uprobe_events(true);
@ -2402,6 +2408,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
pr_debug("No kprobe blacklist support, ignored\n");
}
safename = (pev->point.function && !strisglob(pev->point.function));
ret = 0;
pr_info("Added new event%s\n", (ntevs > 1) ? "s:" : ":");
for (i = 0; i < ntevs; i++) {
@ -2420,10 +2427,10 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
if (pev->event)
event = pev->event;
else
if (pev->point.function)
if (safename)
event = pev->point.function;
else
event = tev->point.symbol;
event = tev->point.realname;
if (pev->group)
group = pev->group;
else
@ -2488,9 +2495,11 @@ static int find_probe_functions(struct map *map, char *name)
{
int found = 0;
struct symbol *sym;
struct rb_node *tmp;
map__for_each_symbol_by_name(map, name, sym) {
found++;
map__for_each_symbol(map, sym, tmp) {
if (strglobmatch(sym->name, name))
found++;
}
return found;