UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

rcutorture: Re-enable testing of dynamic expediting 

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>
This commit is contained in:
Paul E. McKenney 2017-12-08 11:37:24 -08:00
parent eb0339934f
commit f7c0e6ad4b
1 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
kernel/rcu/rcutorture.c
View File

@ -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;