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