diff options
Diffstat (limited to 'tools/testing/selftests/rcutorture/bin/jitter.sh')
| -rwxr-xr-x | tools/testing/selftests/rcutorture/bin/jitter.sh | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh b/tools/testing/selftests/rcutorture/bin/jitter.sh index 188b864bc4bf..15d937ba96ca 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=${5-1000} n=1 @@ -47,7 +49,7 @@ do fi # Check for stop request. - if test -f "$TORTURE_STOPFILE" + if ! test -f "$jittering" then exit 1; fi @@ -67,10 +69,10 @@ do srand(n + me + systime()); ncpus = split(cpus, ca); curcpu = ca[int(rand() * ncpus + 1)]; - mask = lshift(1, curcpu); - if (mask + 0 <= 0) - mask = 1; - printf("%#x\n", mask); + z = ""; + for (i = 1; 4 * i <= curcpu; i++) + z = z "0"; + print "0x" 2 ^ (curcpu % 4) z; }' < /dev/null` n=$(($n+1)) if ! taskset -p $cpumask $$ > /dev/null 2>&1 |