diff options
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/ftrace.txt | 20 | ||||
| -rw-r--r-- | Documentation/trace/uprobetracer.txt | 6 |
2 files changed, 23 insertions, 3 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt index 185c39fea2a0..5596e2d71d6d 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 diff --git a/Documentation/trace/uprobetracer.txt b/Documentation/trace/uprobetracer.txt index 94b6b4581763..fa7b680ee8a0 100644 --- a/Documentation/trace/uprobetracer.txt +++ b/Documentation/trace/uprobetracer.txt @@ -76,15 +76,15 @@ Usage examples * Add a probe as a new uprobe event, write a new definition to uprobe_events as below: (sets a uprobe at an offset of 0x4245c0 in the executable /bin/bash) - echo 'p: /bin/bash:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events + echo 'p /bin/bash:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events * Add a probe as a new uretprobe event: - echo 'r: /bin/bash:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events + echo 'r /bin/bash:0x4245c0' > /sys/kernel/debug/tracing/uprobe_events * Unset registered event: - echo '-:bash_0x4245c0' >> /sys/kernel/debug/tracing/uprobe_events + echo '-:p_bash_0x4245c0' >> /sys/kernel/debug/tracing/uprobe_events * Print out the events that are registered: |