Re: [PATCH] Fixes hang in zstd compression test by changing the source of random data.

[Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>]

Em Thu, Aug 22, 2019 at 01:55:15PM +0000, James Clark escreveu:
> 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.

message came mangled, had to do it by hand and then hook up your header
so as to get the correct date, attribution, etc, please check
Documentation/process/email-clients.rst,

- Arnaldo
 
> Signed-off-by: James Clark <james.clark@arm.com>
> ---
>  tools/perf/tests/shell/record+zstd_comp_decomp.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/tests/shell/record+zstd_comp_decomp.sh b/tools/perf/tests/shell/record+zstd_comp_decomp.sh
> index 899604d1..63a91ec 100755
> --- a/tools/perf/tests/shell/record+zstd_comp_decomp.sh
> +++ b/tools/perf/tests/shell/record+zstd_comp_decomp.sh
> @@ -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() {
> -- 
> 2.7.4
> 

-- 

- Arnaldo