Commit d93fc7ac authored Aug 22, 2019 by James Clark Committed by Arnaldo Carvalho de Melo Aug 26, 2019

perf tests: Fixes hang in zstd compression test by changing the source of random data



Running 'perf test' with zstd compression linked will hang at the test
'Zstd perf.data compression/decompression' because /dev/random blocks
reads until there is enough entropy. This means that the test will
appear to never complete unless the mouse is continually moved while
running it.

Signed-off-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/3d8cc701-df4e-f949-1715-5118b530e990@arm.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 185bcb92

tools/perf/tests/shell/record+zstd_comp_decomp.sh

+1 −1

Original line number	Diff line number	Diff line
		@@ -13,7 +13,7 @@ skip_if_no_z_record() {
		collect_z_record() {
		echo "Collecting compressed record file:"
		$perf_tool record -o $trace_file -g -z -F 5000 -- \
		dd count=500 if=/dev/random of=/dev/null
		dd count=500 if=/dev/urandom of=/dev/null
		}

		check_compressed_stats() {

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