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authorSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>2014-10-21 17:09:58 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-10-29 10:32:46 -0200
commit7d073b335edc8d97af730c2e3b83ed6642bd3c27 (patch)
tree161f1cf4d4bf4f18c45a5e8de92a3ecc6b8027a2 /tools/perf/arch/powerpc
parent4cdcc33db2f0455f297b4e14e434ba311ec5ca06 (diff)
downloadtalos-op-linux-7d073b335edc8d97af730c2e3b83ed6642bd3c27.tar.gz
talos-op-linux-7d073b335edc8d97af730c2e3b83ed6642bd3c27.zip
perf tools powerpc: Cache the DWARF debug info
Cache the DWARF debug info for DSO so we don't have to rebuild it for each address in the DSO. Note that dso__new() uses calloc() so don't need to set dso->dwfl to NULL. $ /tmp/perf.orig --version perf version 3.18.rc1.gc2661b8 $ /tmp/perf.new --version perf version 3.18.rc1.g402d62 $ perf stat -e cycles,instructions /tmp/perf.orig report -g > orig Performance counter stats for '/tmp/perf.orig report -g': 6,428,177,183 cycles # 0.000 GHz 4,176,288,391 instructions # 0.65 insns per cycle 1.840666132 seconds time elapsed $ perf stat -e cycles,instructions /tmp/perf.new report -g > new Performance counter stats for '/tmp/perf.new report -g': 305,773,142 cycles # 0.000 GHz 276,048,272 instructions # 0.90 insns per cycle 0.087693543 seconds time elapsed $ diff orig new $ Changelog[v2]: [Arnaldo Carvalho] Cache in existing global objects rather than create new static/globals in functions. Reported-by: Anton Blanchard <anton@samba.org> Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: Anton Blanchard <anton@au1.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/20141022000958.GB2228@us.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/arch/powerpc')
-rw-r--r--tools/perf/arch/powerpc/util/skip-callchain-idx.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/tools/perf/arch/powerpc/util/skip-callchain-idx.c b/tools/perf/arch/powerpc/util/skip-callchain-idx.c
index d73ef8bb08c7..9892b0f0bec4 100644
--- a/tools/perf/arch/powerpc/util/skip-callchain-idx.c
+++ b/tools/perf/arch/powerpc/util/skip-callchain-idx.c
@@ -145,7 +145,7 @@ static Dwarf_Frame *get_dwarf_frame(Dwfl_Module *mod, Dwarf_Addr pc)
* yet used)
* -1 in case of errors
*/
-static int check_return_addr(const char *exec_file, Dwarf_Addr pc)
+static int check_return_addr(struct dso *dso, Dwarf_Addr pc)
{
int rc = -1;
Dwfl *dwfl;
@@ -156,15 +156,27 @@ static int check_return_addr(const char *exec_file, Dwarf_Addr pc)
Dwarf_Addr end = pc;
bool signalp;
- dwfl = dwfl_begin(&offline_callbacks);
- if (!dwfl) {
- pr_debug("dwfl_begin() failed: %s\n", dwarf_errmsg(-1));
- return -1;
- }
+ dwfl = dso->dwfl;
- if (dwfl_report_offline(dwfl, "", exec_file, -1) == NULL) {
- pr_debug("dwfl_report_offline() failed %s\n", dwarf_errmsg(-1));
- goto out;
+ if (!dwfl) {
+ dwfl = dwfl_begin(&offline_callbacks);
+ if (!dwfl) {
+ pr_debug("dwfl_begin() failed: %s\n", dwarf_errmsg(-1));
+ return -1;
+ }
+
+ if (dwfl_report_offline(dwfl, "", dso->long_name, -1) == NULL) {
+ pr_debug("dwfl_report_offline() failed %s\n",
+ dwarf_errmsg(-1));
+ /*
+ * We normally cache the DWARF debug info and never
+ * call dwfl_end(). But to prevent fd leak, free in
+ * case of error.
+ */
+ dwfl_end(dwfl);
+ goto out;
+ }
+ dso->dwfl = dwfl;
}
mod = dwfl_addrmodule(dwfl, pc);
@@ -194,7 +206,6 @@ static int check_return_addr(const char *exec_file, Dwarf_Addr pc)
rc = check_return_reg(ra_regno, frame);
out:
- dwfl_end(dwfl);
return rc;
}
@@ -246,7 +257,7 @@ int arch_skip_callchain_idx(struct machine *machine, struct thread *thread,
return skip_slot;
}
- rc = check_return_addr(dso->long_name, ip);
+ rc = check_return_addr(dso, ip);
pr_debug("DSO %s, nr %" PRIx64 ", ip 0x%" PRIx64 "rc %d\n",
dso->long_name, chain->nr, ip, rc);
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