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author | Zhengjun Xing <zhengjun.xing@linux.intel.com> | 2019-10-18 09:20:34 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-10 11:34:15 +0100 |
commit | e3d2a341b2de3c4a43e39dcbb01b7af20f0e13f4 (patch) | |
tree | da118009b84eeba889daa954b3c438b47180bcee | |
parent | c5641f4def8f3d220882876244edc32d9bf9548b (diff) |
tracing: Fix "gfp_t" format for synthetic events
[ Upstream commit 9fa8c9c647be624e91b09ecffa7cd97ee0600b40 ]
In the format of synthetic events, the "gfp_t" is shown as "signed:1",
but in fact the "gfp_t" is "unsigned", should be shown as "signed:0".
The issue can be reproduced by the following commands:
echo 'memlatency u64 lat; unsigned int order; gfp_t gfp_flags; int migratetype' > /sys/kernel/debug/tracing/synthetic_events
cat /sys/kernel/debug/tracing/events/synthetic/memlatency/format
name: memlatency
ID: 2233
format:
field:unsigned short common_type; offset:0; size:2; signed:0;
field:unsigned char common_flags; offset:2; size:1; signed:0;
field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
field:int common_pid; offset:4; size:4; signed:1;
field:u64 lat; offset:8; size:8; signed:0;
field:unsigned int order; offset:16; size:4; signed:0;
field:gfp_t gfp_flags; offset:24; size:4; signed:1;
field:int migratetype; offset:32; size:4; signed:1;
print fmt: "lat=%llu, order=%u, gfp_flags=%x, migratetype=%d", REC->lat, REC->order, REC->gfp_flags, REC->migratetype
Link: http://lkml.kernel.org/r/20191018012034.6404-1-zhengjun.xing@linux.intel.com
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | kernel/trace/trace_events_hist.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index dd310d3b5843..725b9b35f933 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -674,6 +674,8 @@ static bool synth_field_signed(char *type) { if (str_has_prefix(type, "u")) return false; + if (strcmp(type, "gfp_t") == 0) + return false; return true; } |