The printf used to clear the screen didn't have a format string, this
adds one to avoid a compiler warning.
Signed-off-by: Eric Anholt <eric@anholt.net>
It can be a bit easier to digest the percentages with bar graphs than by
scanning continually changing numbers.
Signed-off-by: Eric Anholt <eric@anholt.net>
For a typical vsync locked application running at 60fps, sampling at just
under twice a frame doesn't seem to give very stable lists of relevent hardware
units because there are a number of units involved that may not be sampled one
second to the next.
This bumps the sample rate to 10,000 instead which is ~ 170 samples per
frame so we tend to hit all the units involved.
It also changes the report threshold to a sample count >= 1, so you don't
see as many units with a percentage of 0.
Signed-off-by: Eric Anholt <eric@anholt.net>
humans are pretty bad at reading percentages quicky; this patch adds a
histogram capability to make it more visually clear as to which lines are
big ticket items
This is the case where debugfs is mounted, the dri/0 directory
exists but there's no i915_ringbuffer_info file. Point the user
toward upgrading the driver.
Right now it requires a filename on the command line, (such as
/debug/dri/0/i915_batchbuffers). We plan to make it smarter in
the future by going out and collecting all the data it needs.
