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| author | Paul E. McKenney | 2018-05-22 20:38:47 +0200 |
|---|---|---|
| committer | Paul E. McKenney | 2018-07-13 00:42:04 +0200 |
| commit | 3025520ec424df8b0fd5cdc319ad6b83406d9954 (patch) | |
| tree | c58744959ebe2755b9c5dcb6b78049eaa6f866f1 /include/linux/torture.h | |
| parent | rcutorture: Use atomic increment for n_rcu_torture_timers (diff) | |
| download | kernel-qcow2-linux-3025520ec424df8b0fd5cdc319ad6b83406d9954.tar.gz kernel-qcow2-linux-3025520ec424df8b0fd5cdc319ad6b83406d9954.tar.xz kernel-qcow2-linux-3025520ec424df8b0fd5cdc319ad6b83406d9954.zip | |
rcutorture: Use per-CPU random state for rcu_torture_timer()
Currently, the rcu_torture_timer() function uses a single global
torture_random_state structure protected by a single global lock.
This conflicts to some extent with performance and scalability,
but even more with the goal of consolidating read-side testing
with rcu_torture_reader(). This commit therefore creates a per-CPU
torture_random_state structure for use by rcu_torture_timer() and
eliminates the lock.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Make rcu_torture_timer_rand static, per 0day Test Robot report. ]
Diffstat (limited to 'include/linux/torture.h')
| -rw-r--r-- | include/linux/torture.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/torture.h b/include/linux/torture.h index a55e80817dae..61dfd93b6ee4 100644 --- a/include/linux/torture.h +++ b/include/linux/torture.h @@ -64,6 +64,8 @@ struct torture_random_state { long trs_count; }; #define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 } +#define DEFINE_TORTURE_RANDOM_PERCPU(name) \ + DEFINE_PER_CPU(struct torture_random_state, name) unsigned long torture_random(struct torture_random_state *trsp); /* Task shuffler, which causes CPUs to occasionally go idle. */ |