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authorSteven Rostedt <srostedt@redhat.com>2009-05-26 14:25:22 -0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-05-26 14:25:22 -0400
commitbe74b73a57645cc253d881ab0c1014eb64b9cf22 (patch)
tree83f14ae9a43fe98a1363d30d20d60245e1115382 /include/linux/ftrace_event.h
parent0e907c99391362385c8e3af2c43b904dd1fd5d73 (diff)
tracing: add __print_flags for events
Developers have been asking for the ability in the ftrace event tracer to display names of bits in a flags variable. Instead of printing out c2, it would be easier to read FOO|BAR|GOO, assuming that FOO is bit 1, BAR is bit 6 and GOO is bit 7. Some examples where this would be useful are the state flags in a context switch, kmalloc flags, and even permision flags in accessing files. [ v2 changes include: Frederic Weisbecker's idea of using a mask instead of bits, thus we can output GFP_KERNEL instead of GPF_WAIT|GFP_IO|GFP_FS. Li Zefan's idea of allowing the caller of __print_flags to add their own delimiter (or no delimiter) where we can get for file permissions rwx instead of r|w|x. ] [ v3 changes: Christoph Hellwig's idea of using an array instead of va_args. ] [ Impact: better displaying of flags in trace output ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'include/linux/ftrace_event.h')
-rw-r--r--include/linux/ftrace_event.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index bae51ddfabd3..4b58cf1a11c2 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -3,12 +3,23 @@
3 3
4#include <linux/trace_seq.h> 4#include <linux/trace_seq.h>
5#include <linux/ring_buffer.h> 5#include <linux/ring_buffer.h>
6 6#include <linux/percpu.h>
7 7
8struct trace_array; 8struct trace_array;
9struct tracer; 9struct tracer;
10struct dentry; 10struct dentry;
11 11
12DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq);
13
14struct trace_print_flags {
15 unsigned long mask;
16 const char *name;
17};
18
19const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
20 unsigned long flags,
21 const struct trace_print_flags *flag_array);
22
12/* 23/*
13 * The trace entry - the most basic unit of tracing. This is what 24 * The trace entry - the most basic unit of tracing. This is what
14 * is printed in the end as a single line in the trace output, such as: 25 * is printed in the end as a single line in the trace output, such as: