diff options
Diffstat (limited to '')
| -rwxr-xr-x | tools/testing/selftests/rcutorture/bin/jitter.sh | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh b/tools/testing/selftests/rcutorture/bin/jitter.sh index 30cb5b27d32e..fd1ffaa5a135 100755 --- a/tools/testing/selftests/rcutorture/bin/jitter.sh +++ b/tools/testing/selftests/rcutorture/bin/jitter.sh @@ -5,10 +5,11 @@ # of this script is to inflict random OS jitter on a concurrently running # test. # -# Usage: jitter.sh me duration [ sleepmax [ spinmax ] ] +# Usage: jitter.sh me jittering-path duration [ sleepmax [ spinmax ] ] # # me: Random-number-generator seed salt. # duration: Time to run in seconds. +# jittering-path: Path to file whose removal will stop this script. # sleepmax: Maximum microseconds to sleep, defaults to one second. # spinmax: Maximum microseconds to spin, defaults to one millisecond. # @@ -17,9 +18,10 @@ # Authors: Paul E. McKenney <paulmck@linux.ibm.com> me=$(($1 * 1000)) -duration=$2 -sleepmax=${3-1000000} -spinmax=${4-1000} +jittering=$2 +duration=$3 +sleepmax=${4-1000000} +spinmax=${5-1000} n=1 @@ -46,6 +48,12 @@ do exit 0; fi + # Check for stop request. + if ! test -f "$jittering" + then + exit 1; + fi + # Set affinity to randomly selected online CPU if cpus=`grep 1 /sys/devices/system/cpu/*/online 2>&1 | sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//'` @@ -60,16 +68,12 @@ do cpumask=`awk -v cpus="$cpus" -v me=$me -v n=$n 'BEGIN { srand(n + me + systime()); ncpus = split(cpus, ca); - curcpu = ca[int(rand() * ncpus + 1)]; - mask = lshift(1, curcpu); - if (mask + 0 <= 0) - mask = 1; - printf("%#x\n", mask); + print ca[int(rand() * ncpus + 1)]; }' < /dev/null` n=$(($n+1)) - if ! taskset -p $cpumask $$ > /dev/null 2>&1 + if ! taskset -c -p $cpumask $$ > /dev/null 2>&1 then - echo taskset failure: '"taskset -p ' $cpumask $$ '"' + echo taskset failure: '"taskset -c -p ' $cpumask $$ '"' exit 1 fi |