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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Useful knowledge for anyone looking at the documentation and following
the linkes.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Thomas Wood <thomas.wood@intel.com>
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igt_save_module_param is an internal static function and therefore isn't
included in the public API documentation.
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
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The section id is generated from the section title and is used to create
the html output filename, which therefore causes problems if it includes
a '/' character.
Cc: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
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https://en.wikipedia.org/wiki/Trimean
The trimean is a the most efficient 3-point L-estimator (estimator
of central tendency, i.e. average), even more robust than the
median at estimating the average of a sample population.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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https://en.wikipedia.org/wiki/Interquartile_mean
The IQM is a truncated mean and so is very similar to the scoring
method used in sports that are evaluated by a panel of judges:
discard the lowest and the highest scores; calculate the mean
value of the remaining scores.
It's useful to hide outliers in measurements (due to cold cache etc),
without having to worry too much about the actual distribution.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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It's all about good looking APIs.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Chris mentioned he wanted to be able to measure a variable "for one
second" and use igt_stats to store them. That's one case where we don't
know the number of data points upfront.
We should really support that, so here it is.
v2: Just free ->sorted when a new capacity is needed.
ensure_sorted_values() will then reallocate the array to the new
capacity on demand (Chris)
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Chris had a doubt, and I was lazy and didn't do a similar test for the
quartiles/median than for the mean (test_invalidate_mean()). Plug that
gap.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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IQR is a good measure of dispersion.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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More stuff, quite useful characteristics of a dataset.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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In case we want to push a bunch of values in one go.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Lucky enough to have exact values, == works!
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Somewhat useful, for instance to size an histogram.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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We're going to use this simple fixture once more, might as well make a
function instead of copy/pasting code.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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This changes how we compute the variance. We want an unbiased variance
when reasoning about a sample.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Sigh.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Looks better!
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Because the structure started small, I initialized every member
directly, but that means that the new fields added weren't properly
initialized (sigh!). Zero the whole thing first then.
Also, the punishment for introducing a bug should be to write the
corresponding unit test. It's not a perfect one, but I'll take it.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Sure, that's an implementation details, but make sure we do recompute
the mean when we add a new value.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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Sure, it'll be freed at exit(), but might as well be a bit pedantic.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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There are several types of averages eg. mean, median and mode.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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With this, we don't need to worry about what happened to the buffer
before.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
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I often run "sudo ./test 2>&1 | tee output.txt", and when we're
succeeding - never printing to stderr - the output gets buffered and
is never flushed (because it doesn't point to a terminal), so I never
know which test is running. With this fflush, I'm able to know when
each test finishes.
v2: Add blank line too (Chris)
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
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The master plan would be to get a bit more stats in it, at least the
standard deviation and confidence interval. Just need the average for
now.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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If we are in an interactive session, enable the locale. This allows for
features like setting thousand separators for printing large values. By
only enabling it for interactive terminals, we avoid changing outputs
for the test scripts (leaving them as the "C" locale).
Note this mainly affects the testcases, or binaries built using libigt.
Other binaries need to be localised separately.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
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Uses kernel commit 49e4d842f0d0892c3d26c93a81b9f22c1467030e
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon Jun 15 12:23:48 2015 +0100
drm/i915: Report to userspace if we have a (presumed) working GPU reset
to determine whether the kernel has a working GPU reset before injecting
a hang (and so skip tests requring hang recovery if not available).
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Unit test to check a segfaulting subtest is handled correctly.
v2: Added script to check subtest results
v3: Removed script. Updated test to use fork to monitor return status.
v4: Added igt_segfault to .gitignore
Signed-off-by: Derek Morton <derek.j.morton@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Some i915.ko features have very nice IGT tests, which are never
executed because the features are disabled by default. This leads to
unnoticed regressions both in the Kernel and in the IGT tests. We
have seen this multiple times, for example, on FBC and PSR.
We want to be able to run IGT and actually test these
disabled-by-default features in order to make sure we at least don't
break them even more. Sometimes they may be disabled for some specific
reason, and we don't want to increase the set of reasons without
noticing.
To help solving this problem, this commit adds some helper functions
that should make it easier to change certain i915.ko parameters and
then restore their original values at the end of the test. With this,
I'm hoping QA will be able to detect any regressions and automatically
bisect them - or, with PRTS, reject the patches before they are even
merged.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
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fatal_signal_handler() was trapping fatal errors but not
flagging the test as failing or setting an exit code.
The result was that the test would return Ok or Skipped
depending on what the other subtests did even though one
of the subtests had segfaulted.
Signed-off-by: Derek Morton <derek.j.morton@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Add a make file for android so the unit tests can be built.
Enabled asserts for the library code so the unit test behaviour
is correct.
Signed-off-by: Derek Morton <derek.j.morton@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
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Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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It can be useful to have one of those to carry state between the handler
parsing the options and the rest of the test. Right now the only thing
we can do is to use global variables for that.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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igt_assert_neq can only compare integers, not pointers.
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
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Fix various typos, add missing parameter documentation, include the
igt_draw section and update the list of ignored headers.
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
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Let's just steal the "crc" namespace and add this by default to
igt_pipe_crc_collect_crc() instead of adding more calls to other
tests. If tests want special waits on just some of their collect_crc()
calls, they can use another name instead of "crc".
This is very useful when developing, especially when the CRC we get is
wrong: we want to look at the screen to see what's going on before we
can think about how to fix the problem. So let's add this to the lib
instead of adding this to every single test I need to debug.
v2: Add some documentation (Daniel).
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
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commit a26f9f9ad0e679c7ce413a25d34f6914e1174151
Author: chandra konduru <chandra.konduru@intel.com>
Date: Mon Mar 30 13:52:04 2015 -0700
i-g-t: Adding plane scaling test case
Started doing this and broke kms_rotation_crc.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: chandra konduru <chandra.konduru@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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There were two paths for fb and !fb.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: chandra konduru <chandra.konduru@intel.com>
Cc: Thomas Wood <thomas.wood@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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