From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Michel Lespinasse <walken@google.com>,
David Rientjes <rientjes@google.com>,
Axel Rasmussen <axelrasmussen@google.com>
Subject: [for-next][PATCH 12/12] tracing: support "bool" type in synthetic trace events
Date: Wed, 14 Oct 2020 13:36:59 -0400 [thread overview]
Message-ID: <20201014173729.913068818@goodmis.org> (raw)
In-Reply-To: <20201014173647.955053902@goodmis.org>
From: Axel Rasmussen <axelrasmussen@google.com>
It's common [1] to define tracepoint fields as "bool" when they contain
a true / false value. Currently, defining a synthetic event with a
"bool" field yields EINVAL. It's possible to work around this by using
e.g. u8 (assuming sizeof(bool) is 1, and bool is unsigned; if either of
these properties don't match, you get EINVAL [2]).
Supporting "bool" explicitly makes hooking this up easier and more
portable for userspace.
[1]: grep -r "bool" include/trace/events/
[2]: check_synth_field() in kernel/trace/trace_events_hist.c
Link: https://lkml.kernel.org/r/20201009220524.485102-2-axelrasmussen@google.com
Acked-by: Michel Lespinasse <walken@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_events_synth.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index d239f0e2af8f..3212e2c653b3 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -229,6 +229,8 @@ static int synth_field_size(char *type)
size = sizeof(long);
else if (strcmp(type, "unsigned long") == 0)
size = sizeof(unsigned long);
+ else if (strcmp(type, "bool") == 0)
+ size = sizeof(bool);
else if (strcmp(type, "pid_t") == 0)
size = sizeof(pid_t);
else if (strcmp(type, "gfp_t") == 0)
@@ -271,6 +273,8 @@ static const char *synth_field_fmt(char *type)
fmt = "%ld";
else if (strcmp(type, "unsigned long") == 0)
fmt = "%lu";
+ else if (strcmp(type, "bool") == 0)
+ fmt = "%d";
else if (strcmp(type, "pid_t") == 0)
fmt = "%d";
else if (strcmp(type, "gfp_t") == 0)
--
2.28.0
prev parent reply other threads:[~2020-10-14 17:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-14 17:36 [for-next][PATCH 00/12] tracing: Last minute updates before sending to Linus Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 01/12] tracing: Check return value of __create_val_fields() before using its result Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 02/12] tracing: Fix race in trace_open and buffer resize call Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 03/12] tracing/boot: Add ftrace.instance.*.alloc_snapshot option Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 04/12] tracing: Fix some typos in comments Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 05/12] tracing: Dont show dynamic string internals in synthetic event description Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 06/12] tracing: Move is_good_name() from trace_probe.h to trace.h Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 07/12] tracing: Check that the synthetic event and field names are legal Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 08/12] tracing: Add synthetic event error logging Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 09/12] selftests/ftrace: Change synthetic event name for inter-event-combined test Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 10/12] tracing: Handle synthetic event array field type checking correctly Steven Rostedt
2020-10-14 17:36 ` [for-next][PATCH 11/12] selftests/ftrace: Add test case for synthetic event syntax errors Steven Rostedt
2020-10-14 17:36 ` Steven Rostedt [this message]
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