[tip:perf/core] perf tools: Bail out at "--sort dcacheline" and cacheline_size not known

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  0d203166de37ad50ea826f97570b3a2beea87c9d
Gitweb:     http://git.kernel.org/tip/0d203166de37ad50ea826f97570b3a2beea87c9d
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Fri, 15 Jul 2016 10:08:43 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 15 Jul 2016 10:08:43 -0300

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@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-ho8d8g8mh0o2dri7ckcccafi@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/sort.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

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 @@ static int sort_dimension__add(struct perf_hpp_list *list, const char *tok,
 		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 @@ static int setup_sort_list(struct perf_hpp_list *list, char *str,
 		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);