Only active when the file contains a number greater than 0.
(in microseconds)
+ buffer_percent:
+
+ This is the watermark for how much the ring buffer needs to be filled
+ before a waiter is woken up. That is, if an application calls a
+ blocking read syscall on one of the per_cpu trace_pipe_raw files, it
+ will block until the given amount of data specified by buffer_percent
+ is in the ring buffer before it wakes the reader up. This also
+ controls how the splice system calls are blocked on this file::
+
+ 0 - means to wake up as soon as there is any data in the ring buffer.
+ 50 - means to wake up when roughly half of the ring buffer sub-buffers
+ are full.
+ 100 - means to block until the ring buffer is totally full and is
+ about to start overwriting the older data.
+
buffer_size_kb:
This sets or displays the number of kilobytes each CPU