perf tools: Stop reading the kallsyms data from perf.data

As it is not used anymore, since 'perf script' switched to asking
libtraceevent to use tools/perf's symbol resolution routines.

Acked-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/n/tip-4ilhofz4b7o8yokvutjt9yzz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index d495741..8ff7d62 100644 (file)
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -135,36 +135,6 @@ void event_format__print(struct event_format *event,
        return event_format__fprintf(event, cpu, data, size, stdout);
 }
 
-void parse_proc_kallsyms(struct pevent *pevent,
-                        char *file, unsigned int size __maybe_unused)
-{
-       unsigned long long addr;
-       char *func;
-       char *line;
-       char *next = NULL;
-       char *addr_str;
-       char *mod;
-       char *fmt = NULL;
-
-       line = strtok_r(file, "\n", &next);
-       while (line) {
-               mod = NULL;
-               addr_str = strtok_r(line, " ", &fmt);
-               addr = strtoull(addr_str, NULL, 16);
-               /* skip character */
-               strtok_r(NULL, " ", &fmt);
-               func = strtok_r(NULL, "\t", &fmt);
-               mod = strtok_r(NULL, "]", &fmt);
-               /* truncate the extra '[' */
-               if (mod)
-                       mod = mod + 1;
-
-               pevent_register_function(pevent, func, addr, mod);
-
-               line = strtok_r(NULL, "\n", &next);
-       }
-}
-
 void parse_ftrace_printk(struct pevent *pevent,
                         char *file, unsigned int size __maybe_unused)
 {

diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 54d9e9b..b67a0cc 100644 (file)
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -162,25 +162,23 @@ out:
 static int read_proc_kallsyms(struct pevent *pevent)
 {
        unsigned int size;
-       char *buf;
 
        size = read4(pevent);
        if (!size)
                return 0;
-
-       buf = malloc(size + 1);
-       if (buf == NULL)
-               return -1;
-
-       if (do_read(buf, size) < 0) {
-               free(buf);
-               return -1;
-       }
-       buf[size] = '\0';
-
-       parse_proc_kallsyms(pevent, buf, size);
-
-       free(buf);
+       /*
+        * Just skip it, now that we configure libtraceevent to use the
+        * tools/perf/ symbol resolver.
+        *
+        * We need to skip it so that we can continue parsing old perf.data
+        * files, that contains this /proc/kallsyms payload.
+        *
+        * Newer perf.data files will have just the 4-bytes zeros "kallsyms
+        * payload", so that older tools can continue reading it and interpret
+        * it as "no kallsyms payload is present".
+        */
+       lseek(input_fd, size, SEEK_CUR);
+       trace_data_size += size;
        return 0;
 }