Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 04/12] rcutorture: Re-enable testing of dynamic expediting | Date | Mon, 26 Feb 2018 14:02:33 -0800 |
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During boot, normal grace periods are processed as expedited. When rcutorture is built into the kernel, it starts during boot and thus detects that normal grace periods are unconditionally expedited. Therefore, rcutorture concludes that there is no point in trying to dynamically enable expediting, do it disables this aspect of testing, which is a bit of an overreaction to the temporary boot-time expediting.
This commit therefore rechecks forced expediting throughout the test, enabling dynamic expediting if normal grace periods are processed normally at any point.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> --- kernel/rcu/rcutorture.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 6c46cd1d8fd7..2964b9236ddc 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -909,14 +909,10 @@ rcu_torture_writer(void *arg) int nsynctypes = 0; VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); - if (!can_expedite) { + if (!can_expedite) pr_alert("%s" TORTURE_FLAG - " GP expediting controlled from boot/sysfs for %s,\n", + " GP expediting controlled from boot/sysfs for %s.\n", torture_type, cur_ops->name); - pr_alert("%s" TORTURE_FLAG - " Disabled dynamic grace-period expediting.\n", - torture_type); - } /* Initialize synctype[] array. If none set, take default. */ if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1) @@ -1011,6 +1007,9 @@ rcu_torture_writer(void *arg) rcu_unexpedite_gp(); if (++expediting > 3) expediting = -expediting; + } else if (!can_expedite) { /* Disabled during boot, recheck. */ + can_expedite = !rcu_gp_is_expedited() && + !rcu_gp_is_normal(); } rcu_torture_writer_state = RTWS_STUTTER; stutter_wait("rcu_torture_writer"); @@ -1021,6 +1020,10 @@ rcu_torture_writer(void *arg) while (can_expedite && expediting++ < 0) rcu_unexpedite_gp(); WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); + if (!can_expedite) + pr_alert("%s" TORTURE_FLAG + " Dynamic grace-period expediting was disabled.\n", + torture_type); rcu_torture_writer_state = RTWS_STOPPING; torture_kthread_stopping("rcu_torture_writer"); return 0; -- 2.5.2
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