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authorTom Zanussi <tom.zanussi@linux.intel.com>2013-01-18 13:51:25 -0600
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-01-24 16:40:52 -0300
commit10ee9fa3b92dece36209a3786d7bd558d459635f (patch)
tree06ffae5cf284070e8de34cf1ccbf44a723cf90c0
parent2a16bf8c1333aa5107ce6474c4df9988d62b41d3 (diff)
downloadlinux-linaro-stable-10ee9fa3b92dece36209a3786d7bd558d459635f.tar.gz
perf tools: Reinstate 'signed' field flag for tracepoints
For some reason the libtraceevent tracepoint-parsing code is missing the FIELD_IS_SIGNED flag-setting code, which causes problems for the Perl trace event binding at least, since it ends up unable to recognize negative numbers. Things like checking for negative return values therefore fail, causing scripts like rwtop to instead interpret the negative return value as a large positive value, which in turn get added to e.g. read totals with insanely invalid results. So set the FIELD_IS_SIGNED flag for tracepoint events that specify "signed:1". Before: # perf script record rw-by-pid # perf script report rw-by-pid read counts by pid: pid comm # reads bytes_requested bytes_read ------ -------------------- ----------- ---------- ---------- 753 Xorg 88 512000 7.74763251095801e+20 1619 firefox 42 462 2.58254417031934e+20 1232 gnome-shell 11 176 1.10680464442257e+20 1471 gnome-terminal 3 16366 18446744073709551615 1408 libsocialweb-co 2 32 18446744073709551613 After: # perf script report rw-by-pid read counts by pid: pid comm # reads bytes_requested bytes_read ------ -------------------- ----------- ---------- ---------- 753 Xorg 88 512000 2764 1619 firefox 42 462 126 1232 gnome-shell 11 176 40 1471 gnome-terminal 3 16366 10 1408 libsocialweb-co 2 32 8 Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Link: http://lkml.kernel.org/r/1471b5968821a455cf5168bb4567964e74ecf530.1358527965.git.tom.zanussi@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/lib/traceevent/event-parse.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index f5046191d086..bb8b3db0e583 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -1462,7 +1462,8 @@ static int event_read_fields(struct event_format *event, struct format_field **f
if (read_expect_type(EVENT_ITEM, &token))
goto fail;
- /* add signed type */
+ if (strtoul(token, NULL, 0))
+ field->flags |= FIELD_IS_SIGNED;
free_token(token);
if (read_expected(EVENT_OP, ";") < 0)