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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-03-12 13:55:48 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-05-27 12:59:57 -0700
commit3838cc1850ccd09f93e729e9047ec1995026f83e (patch)
tree10c704c147266b9083bc0f9a16e51116847057f4 /kernel/rcu
parent6530b3f4c5043aa8ef66faa8296291b1ea6ba2eb (diff)
downloadop-kernel-dev-3838cc1850ccd09f93e729e9047ec1995026f83e.zip
op-kernel-dev-3838cc1850ccd09f93e729e9047ec1995026f83e.tar.gz
rcutorture: Allow negative values of nreaders to oversubscribe
By default, with rcutorture.nreaders equal to -1, rcutorture provisions N-1 reader kthreads, where N is the number of CPUs. This avoids rcutorture-induced stalls, but also avoids heavier levels of torture. This commit therefore allows negative values of rcutorture.nreaders to specify larger numbers of reader kthreads, so that for example rcutorture.nreaders=-2 provisions N kthreads and rcutorture.nreaders=-5 provisions N+3 kthreads. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: Update documentation, as suggested by Josh Triplett. ]
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/rcutorture.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index a67ef6f..7294d60 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1701,7 +1701,7 @@ rcu_torture_init(void)
if (nreaders >= 0) {
nrealreaders = nreaders;
} else {
- nrealreaders = num_online_cpus() - 1;
+ nrealreaders = num_online_cpus() - 2 - nreaders;
if (nrealreaders <= 0)
nrealreaders = 1;
}
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