diff options
Diffstat (limited to 'Documentation/trace/ftrace.txt')
| -rw-r--r-- | Documentation/trace/ftrace.txt | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt index 185c39fea2a0..006f47c7d913 100644 --- a/Documentation/trace/ftrace.txt +++ b/Documentation/trace/ftrace.txt @@ -362,6 +362,26 @@ of ftrace. Here is a list of some of the key files: to correlate events across hypervisor/guest if tb_offset is known. + mono: This uses the fast monotonic clock (CLOCK_MONOTONIC) + which is monotonic and is subject to NTP rate adjustments. + + mono_raw: + This is the raw monotonic clock (CLOCK_MONOTONIC_RAW) + which is montonic but is not subject to any rate adjustments + and ticks at the same rate as the hardware clocksource. + + boot: This is the boot clock (CLOCK_BOOTTIME) and is based on the + fast monotonic clock, but also accounts for time spent in + suspend. Since the clock access is designed for use in + tracing in the suspend path, some side effects are possible + if clock is accessed after the suspend time is accounted before + the fast mono clock is updated. In this case, the clock update + appears to happen slightly sooner than it normally would have. + Also on 32-bit systems, it's possible that the 64-bit boot offset + sees a partial update. These effects are rare and post + processing should be able to handle them. See comments in the + ktime_get_boot_fast_ns() function for more information. + To set a clock, simply echo the clock name into this file. echo global > trace_clock @@ -396,6 +416,12 @@ of ftrace. Here is a list of some of the key files: trace_fd = open("trace_marker", WR_ONLY); + trace_marker_raw: + + This is similar to trace_marker above, but is meant for for binary data + to be written to it, where a tool can be used to parse the data + from trace_pipe_raw. + uprobe_events: Add dynamic tracepoints in programs. @@ -2218,16 +2244,13 @@ hrtimer_interrupt sys_nanosleep -Perhaps this is not enough. The filters also allow simple wild -cards. Only the following are currently available +Perhaps this is not enough. The filters also allow glob(7) matching. <match>* - will match functions that begin with <match> *<match> - will match functions that end with <match> *<match>* - will match functions that have <match> in it - -These are the only wild cards which are supported. - - <match>*<match> will not work. + <match1>*<match2> - will match functions that begin with + <match1> and end with <match2> Note: It is better to use quotes to enclose the wild cards, otherwise the shell may expand the parameters into names |