diff options
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/coresight.txt | 4 | ||||
| -rw-r--r-- | Documentation/trace/ftrace.txt | 5 |
2 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/trace/coresight.txt b/Documentation/trace/coresight.txt index 77d14d51a670..0a5c3290e732 100644 --- a/Documentation/trace/coresight.txt +++ b/Documentation/trace/coresight.txt @@ -15,7 +15,7 @@ HW assisted tracing is becoming increasingly useful when dealing with systems that have many SoCs and other components like GPU and DMA engines. ARM has developed a HW assisted tracing solution by means of different components, each being added to a design at synthesis time to cater to specific tracing needs. -Compoments are generally categorised as source, link and sinks and are +Components are generally categorised as source, link and sinks and are (usually) discovered using the AMBA bus. "Sources" generate a compressed stream representing the processor instruction @@ -138,7 +138,7 @@ void coresight_unregister(struct coresight_device *csdev); The registering function is taking a "struct coresight_device *csdev" and register the device with the core framework. The unregister function takes -a reference to a "strut coresight_device", obtained at registration time. +a reference to a "struct coresight_device", obtained at registration time. If everything goes well during the registration process the new devices will show up under /sys/bus/coresight/devices, as showns here for a TC2 platform: diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt index 072d3c4d5753..ef621d34ba5b 100644 --- a/Documentation/trace/ftrace.txt +++ b/Documentation/trace/ftrace.txt @@ -346,6 +346,11 @@ of ftrace. Here is a list of some of the key files: x86-tsc: Architectures may define their own clocks. For example, x86 uses its own TSC cycle clock here. + ppc-tb: This uses the powerpc timebase register value. + This is in sync across CPUs and can also be used + to correlate events across hypervisor/guest if + tb_offset is known. + To set a clock, simply echo the clock name into this file. echo global > trace_clock |