perf report: Add --symbols parameter

So that we can filter by symbol name.

The 'pfunct' utility in the 'dwarves' package can be used to
create a file with the functions one wants.

Example:

[acme@doppio pahole]$ pfunct /usr/lib/debug/usr/lib64/libdw-0.141.so.debug | grep dwarf > /tmp/dwarf.symbols
[acme@doppio pahole]$ wc -l /tmp/dwarf.symbols
93 /tmp/dwarf.symbols
[acme@doppio pahole]$ head -3 /tmp/dwarf.symbols
dwfl_addrdwarf
dwfl_module_getdwarf
dwfl_getdwarf
[acme@doppio pahole]$ perf report --sort comm,dso,symbol --comms pahole --dsos /usr/lib64/libdw-0.141.so --symbols file:///tmp/dwarf.symbols

    33.99%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_tag
    29.07%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_decl_file
    27.71%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_getsrclines
     4.54%            pahole  /usr/lib64/libdw-0.141.so  0x00000000007400
     3.93%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_decl_line
     0.46%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_getlocation
     0.18%            pahole  /usr/lib64/libdw-0.141.so  [.] __libdwarf_next_prime
     0.13%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_diecu

[acme@doppio pahole]$

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1246399282-20934-4-git-send-email-acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 12 insertions, 2 deletions

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 4c44ef1747b9..8aa3f8c88707 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -28,6 +28,10 @@ OPTIONS
 --comms=::
         Only consider symbols in these comms. CSV that understands
         file://filename entries.
+-S::
+--symbols=::
+        Only consider these symbols. CSV that understands
+        file://filename entries.
 
 SEE ALSO
 --------
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 8143477b7ef7..135b7837e6bf 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -33,8 +33,8 @@ static char		*vmlinux = NULL;
 
 static char             default_sort_order[] = "comm,dso";
 static char             *sort_order = default_sort_order;
-static char             *dso_list_str, *comm_list_str;
-static struct strlist   *dso_list, *comm_list;
+static char             *dso_list_str, *comm_list_str, *sym_list_str;
+static struct strlist   *dso_list, *comm_list, *sym_list;
 
 static int              input;
 static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;
@@ -1281,6 +1281,9 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
                 if (dso_list && dso && dso->name && !strlist__has_entry(dso_list, dso->name))
                         return 0;
 
+                if (sym_list && sym && !strlist__has_entry(sym_list, sym->name))
+                        return 0;
+
                 if (hist_entry__add(thread, map, dso, sym, ip, chain, level, period)) {
                         eprintf("problem incrementing symbol count, skipping event\n");
                         return -1;
@@ -1672,6 +1675,8 @@ static const struct option options[] = {
                    "only consider symbols in these dsos"),
         OPT_STRING('C', "comms", &comm_list_str, "comm[,comm...]",
                    "only consider symbols in these comms"),
+        OPT_STRING('S', "symbols", &sym_list_str, "symbol[,symbol...]",
+                   "only consider these symbols"),
         OPT_END()
 };
 
@@ -1726,6 +1731,7 @@ int cmd_report(int argc, const char **argv, const char *prefix)
 
         setup_list(&dso_list, dso_list_str, "dso");
         setup_list(&comm_list, comm_list_str, "comm");
+        setup_list(&sym_list, sym_list_str, "symbol");
 
         setup_pager();