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authorDave Martin <Dave.Martin@arm.com>2015-01-28 15:48:53 +0300
committerSteven Rostedt <rostedt@goodmis.org>2015-01-28 18:34:47 +0300
commit6ea22486ba46bcb665de36514094d74575cd1330 (patch)
treeb0db72c5d2b7dc79a7937f05443a05f1ac5a64c4 /include/linux/ftrace_event.h
parent69a1c994cc540cc84469acf9952f72b899b38e8b (diff)
downloadlinux-6ea22486ba46bcb665de36514094d74575cd1330.tar.xz
tracing: Add array printing helper
If a trace event contains an array, there is currently no standard way to format this for text output. Drivers are currently hacking around this by a) local hacks that use the trace_seq functionailty directly, or b) just not printing that information. For fixed size arrays, formatting of the elements can be open-coded, but this gets cumbersome for arrays of non-trivial size. These approaches result in non-standard content of the event format description delivered to userspace, so userland tools needs to be taught to understand and parse each array printing method individually. This patch implements a __print_array() helper that tracepoint implementations can use instead of reinventing it. A simple C-style syntax is used to delimit the array and its elements {like,this}. So that the helpers can be used with large static arrays as well as dynamic arrays, they take a pointer and element count: they can be used with __get_dynamic_array() for use with dynamic arrays. Link: http://lkml.kernel.org/r/1422449335-8289-2-git-send-email-javi.merino@arm.com Cc: Ingo Molnar <mingo@redhat.com> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace_event.h')
-rw-r--r--include/linux/ftrace_event.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 0bebb5c348b8..5aa4a9269547 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -44,6 +44,10 @@ const char *ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
const char *ftrace_print_hex_seq(struct trace_seq *p,
const unsigned char *buf, int len);
+const char *ftrace_print_array_seq(struct trace_seq *p,
+ const void *buf, int buf_len,
+ size_t el_size);
+
struct trace_iterator;
struct trace_event;