perf tools: Bail out at "--sort dcacheline" and cacheline_size not known
There are cases where further work would be needed to overcome the fact
that neither sysconf(_SC_LEVEL1_DCACHE_LINESIZE) nor
/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size are
available in some systems (Android, for instance), so bail out when such
a situation takes place.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.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-ho8d8g8mh0o2dri7ckcccafi@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 5854b46..947d21f 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2381,6 +2381,9 @@
if (sort__mode != SORT_MODE__MEMORY)
return -EINVAL;
+ if (sd->entry == &sort_mem_dcacheline && cacheline_size == 0)
+ return -EINVAL;
+
if (sd->entry == &sort_mem_daddr_sym)
list->sym = 1;
@@ -2424,7 +2427,10 @@
if (*tok) {
ret = sort_dimension__add(list, tok, evlist, level);
if (ret == -EINVAL) {
- error("Invalid --sort key: `%s'", tok);
+ if (!cacheline_size && !strncasecmp(tok, "dcacheline", strlen(tok)))
+ error("The \"dcacheline\" --sort key needs to know the cacheline size and it couldn't be determined on this system");
+ else
+ error("Invalid --sort key: `%s'", tok);
break;
} else if (ret == -ESRCH) {
error("Unknown --sort key: `%s'", tok);