What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/wrap
Date: June 2015
KernelVersion: 4.3
Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Description: (RW) Configure MSC buffer wrapping. 1 == wrapping enabled.
What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/mode
Date: June 2015
KernelVersion: 4.3
Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Description: (RW) Configure MSC operating mode:
-
"single",
for contiguous buffer mode (high-order alloc);
-
"multi",
for multiblock mode;
-
"ExI",
for DCI handler mode;
-
"debug",
for debug mode;
- any of the currently loaded buffer sinks.
If operating mode changes, existing buffer is deallocated,
provided there are no active users
and tracing is
not enabled,
otherwise the write will fail.
What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/nr_pages
Date: June 2015
KernelVersion: 4.3
Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Description: (RW) Configure MSC buffer size
for "single" or "multi" modes.
In single mode,
this is a single number of pages, has to be
power of 2. In multiblock mode,
this is a comma-separated list
of numbers of pages
for each window to be allocated. Number of
windows is
not limited.
Writing to
this file deallocates existing buffer (provided
there are no active users
and tracing is
not enabled)
and then
allocates a
new one.
What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/win_switch
Date: May 2019
KernelVersion: 5.2
Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Description: (RW) Trigger window
switch for the MSC
's buffer, in
multi-window mode. In
"multi" mode, accepts writes of
"1", thereby
triggering a window
switch for the buffer. Returns an error in any
other operating mode
or attempts to write something other than
"1".
What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/stop_on_full
Date: March 2020
KernelVersion: 5.7
Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Description: (RW) Configure whether trace stops when the last available window
becomes full (1/y/Y)
or wraps around
and continues until the next
window becomes available again (0/n/N).
