perf trace: Support syscall name globbing

So now we can use:

  # perf trace -e pkey_*
   532.784 ( 0.006 ms): pkey/16018 pkey_alloc(init_val: DISABLE_WRITE) = -1 EINVAL Invalid argument
   532.795 ( 0.004 ms): pkey/16018 pkey_mprotect(start: 0x7f380d0a6000, len: 4096, prot: READ|WRITE, pkey: -1) = 0
   532.801 ( 0.002 ms): pkey/16018 pkey_free(pkey: -1                ) = -1 EINVAL Invalid argument
  ^C[root@jouet ~]#

Or '-e epoll*', '-e *msg*', etc.

Combining syscall names with perf events, tracepoints, etc, continues to
be valid, i.e. this is possible:

  # perf probe -L sys_nanosleep
  <SyS_nanosleep@/home/acme/git/linux/kernel/time/hrtimer.c:0>
      0  SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
                        struct timespec __user *, rmtp)
         {
                struct timespec64 tu;

      5         if (get_timespec64(&tu, rqtp))
      6                 return -EFAULT;

                if (!timespec64_valid(&tu))
      9                 return -EINVAL;

     11         current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
     12         current->restart_block.nanosleep.rmtp = rmtp;
     13         return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
         }

  # perf probe my_probe="sys_nanosleep:12 rmtp"
  Added new event:
    probe:my_probe       (on sys_nanosleep:12 with rmtp)

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

	perf record -e probe:my_probe -aR sleep 1

  #
  # perf trace -e probe:my_probe/max-stack=5/,*sleep sleep 1
     0.427 ( 0.003 ms): sleep/16690 nanosleep(rqtp: 0x7ffefc245090) ...
     0.430 (         ): probe:my_probe:(ffffffffbd112923) rmtp=0)
                                       sys_nanosleep ([kernel.kallsyms])
                                       do_syscall_64 ([kernel.kallsyms])
                                       return_from_SYSCALL_64 ([kernel.kallsyms])
                                       __nanosleep_nocancel (/usr/lib64/libc-2.25.so)
     0.427 (1000.208 ms): sleep/16690  ... [continued]: nanosleep()) = 0
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-elycoi8wy6y0w9dkj7ox1mzz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 36 insertions, 5 deletions

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index c1e3288a2dfb..d53bea6bd571 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -37,7 +37,7 @@ OPTIONS
 --expr::
 --event::
         List of syscalls and other perf events (tracepoints, HW cache events,
-        etc) to show.
+        etc) to show. Globbing is supported, e.g.: "epoll_*", "*msg*", etc.
         See 'perf list' for a complete list of events.
         Prefixing with ! shows all syscalls but the ones specified.  You may
         need to escape it.
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d59cdadf3a79..771ddab94bb0 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1261,6 +1261,7 @@ static int trace__read_syscall_info(struct trace *trace, int id)
 static int trace__validate_ev_qualifier(struct trace *trace)
 {
         int err = 0, i;
+        size_t nr_allocated;
         struct str_node *pos;
 
         trace->ev_qualifier_ids.nr = strlist__nr_entries(trace->ev_qualifier);
@@ -1274,13 +1275,18 @@ static int trace__validate_ev_qualifier(struct trace *trace)
                 goto out;
         }
 
+        nr_allocated = trace->ev_qualifier_ids.nr;
         i = 0;
 
         strlist__for_each_entry(pos, trace->ev_qualifier) {
                 const char *sc = pos->s;
-                int id = syscalltbl__id(trace->sctbl, sc);
+                int id = syscalltbl__id(trace->sctbl, sc), match_next = -1;
 
                 if (id < 0) {
+                        id = syscalltbl__strglobmatch_first(trace->sctbl, sc, &match_next);
+                        if (id >= 0)
+                                goto matches;
+
                         if (err == 0) {
                                 fputs("Error:\tInvalid syscall ", trace->output);
                                 err = -EINVAL;
@@ -1290,13 +1296,37 @@ static int trace__validate_ev_qualifier(struct trace *trace)
 
                         fputs(sc, trace->output);
                 }
-
+matches:
                 trace->ev_qualifier_ids.entries[i++] = id;
+                if (match_next == -1)
+                        continue;
+
+                while (1) {
+                        id = syscalltbl__strglobmatch_next(trace->sctbl, sc, &match_next);
+                        if (id < 0)
+                                break;
+                        if (nr_allocated == trace->ev_qualifier_ids.nr) {
+                                void *entries;
+
+                                nr_allocated += 8;
+                                entries = realloc(trace->ev_qualifier_ids.entries,
+                                                  nr_allocated * sizeof(trace->ev_qualifier_ids.entries[0]));
+                                if (entries == NULL) {
+                                        err = -ENOMEM;
+                                        fputs("\nError:\t Not enough memory for parsing\n", trace->output);
+                                        goto out_free;
+                                }
+                                trace->ev_qualifier_ids.entries = entries;
+                        }
+                        trace->ev_qualifier_ids.nr++;
+                        trace->ev_qualifier_ids.entries[i++] = id;
+                }
         }
 
         if (err < 0) {
                 fputs("\nHint:\ttry 'perf list syscalls:sys_enter_*'"
                       "\nHint:\tand: 'man syscalls'\n", trace->output);
+out_free:
                 zfree(&trace->ev_qualifier_ids.entries);
                 trace->ev_qualifier_ids.nr = 0;
         }
@@ -2814,7 +2844,7 @@ static int trace__parse_events_option(const struct option *opt, const char *str,
         struct trace *trace = (struct trace *)opt->value;
         const char *s = str;
         char *sep = NULL, *lists[2] = { NULL, NULL, };
-        int len = strlen(str) + 1, err = -1, list;
+        int len = strlen(str) + 1, err = -1, list, idx;
         char *strace_groups_dir = system_path(STRACE_GROUPS_DIR);
         char group_name[PATH_MAX];
 
@@ -2831,7 +2861,8 @@ static int trace__parse_events_option(const struct option *opt, const char *str,
                         *sep = '\0';
 
                 list = 0;
-                if (syscalltbl__id(trace->sctbl, s) >= 0) {
+                if (syscalltbl__id(trace->sctbl, s) >= 0 ||
+                    syscalltbl__strglobmatch_first(trace->sctbl, s, &idx) >= 0) {
                         list = 1;
                 } else {
                         path__join(group_name, sizeof(group_name), strace_groups_dir, s);