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tracing: Introduce two additional marks for delay

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A fine granulity support for delay would be very useful when profiling
VM logics, such as page allocation including page reclaim and memory
compaction with function graph.

Thus, this patch adds two additional marks with two changes.

 - An equal sign in mark selection function is removed to align code
   behavior with comments and documentation.

 - The function graph example related to delay in ftrace.txt is updated
   to cover all supported marks.

Link: http://lkml.kernel.org/r/1436626300-1679-3-git-send-email-jungseoklee85@gmail.com

Cc: Byungchul Park <byungchul.park@lge.com>
Signed-off-by: Jungseok Lee <jungseoklee85@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jungseok Lee
2015-07-11 14:51:40 +00:00
committed by Steven Rostedt
parent 82c355e81a
commit b838e1d96c
2 changed files with 41 additions and 14 deletions
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4
kernel/trace/trace_output.c
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@@ -496,6 +496,8 @@ static const struct trace_mark {
char sym;
} mark[] = {
MARK(1000000000ULL , '$'), /* 1 sec */
MARK(100000000ULL , '@'), /* 100 msec */
MARK(10000000ULL , '*'), /* 10 msec */
MARK(1000000ULL , '#'), /* 1000 usecs */
MARK(100000ULL , '!'), /* 100 usecs */
MARK(10000ULL , '+'), /* 10 usecs */
@@ -508,7 +510,7 @@ char trace_find_mark(unsigned long long d)
int size = ARRAY_SIZE(mark);
for (i = 0; i < size; i++) {
if (d >= mark[i].val)
if (d > mark[i].val)
break;
}