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rcu: Add rcu_expedite_gp() and rcu_unexpedite_gp() to rcutorture 

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2015-02-18 16:31:29 -08:00
parent 0d39482c3d
commit 4bb3c5f414
1 changed files with 25 additions and 0 deletions
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25
kernel/rcu/rcutorture.c
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@ -853,6 +853,8 @@ rcu_torture_fqs(void *arg)
static int
rcu_torture_writer(void *arg)
{
bool can_expedite = !rcu_gp_is_expedited();
int expediting = 0;
unsigned long gp_snap;
bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal;
bool gp_sync1 = gp_sync;
@ -865,6 +867,12 @@ rcu_torture_writer(void *arg)
int nsynctypes = 0;
VERBOSE_TOROUT_STRING("rcu_torture_writer task started");
pr_alert("%s" TORTURE_FLAG
" Grace periods expedited from boot/sysfs for %s,\n",
torture_type, cur_ops->name);
pr_alert("%s" TORTURE_FLAG
" Testing of dynamic grace-period expediting diabled.\n",
torture_type);
/* Initialize synctype[] array. If none set, take default. */
if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync)
@ -949,9 +957,26 @@ rcu_torture_writer(void *arg)
}
}
rcutorture_record_progress(++rcu_torture_current_version);
/* Cycle through nesting levels of rcu_expedite_gp() calls. */
if (can_expedite &&
!(torture_random(&rand) & 0xff & (!!expediting - 1))) {
WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited());
if (expediting >= 0)
rcu_expedite_gp();
else
rcu_unexpedite_gp();
if (++expediting > 3)
expediting = -expediting;
}
rcu_torture_writer_state = RTWS_STUTTER;
stutter_wait("rcu_torture_writer");
} while (!torture_must_stop());
/* Reset expediting back to unexpedited. */
if (expediting > 0)
expediting = -expediting;
while (can_expedite && expediting++ < 0)
rcu_unexpedite_gp();
WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited());
rcu_torture_writer_state = RTWS_STOPPING;
torture_kthread_stopping("rcu_torture_writer");
return 0;