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Message-Id: <20240816055203.43784-4-neeraj.upadhyay@kernel.org>
Date: Fri, 16 Aug 2024 11:21:58 +0530
From: neeraj.upadhyay@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
kernel-team@...a.com,
rostedt@...dmis.org,
paulmck@...nel.org,
neeraj.upadhyay@...nel.org,
neeraj.upadhyay@....com,
boqun.feng@...il.com,
joel@...lfernandes.org,
urezki@...il.com,
frederic@...nel.org
Subject: [PATCH rcu 3/8] rcutorture: Generic test for NUM_ACTIVE_*RCU_POLL*
From: "Paul E. McKenney" <paulmck@...nel.org>
The rcutorture test suite has specific tests for both of the
NUM_ACTIVE_RCU_POLL_OLDSTATE and NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE
macros provided for RCU polled grace periods. However, with the
advent of NUM_ACTIVE_SRCU_POLL_OLDSTATE, a more generic test is needed.
This commit therefore adds ->poll_active and ->poll_active_full fields
to the rcu_torture_ops structure and converts the existing specific
tests to use these fields, when present.
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
---
kernel/rcu/rcutorture.c | 36 ++++++++++++++++++++++++++++--------
1 file changed, 28 insertions(+), 8 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index b2e6201b4569..acf9f9945d2b 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -373,6 +373,8 @@ struct rcu_torture_ops {
bool (*poll_need_2gp)(bool poll, bool poll_full);
void (*cond_sync)(unsigned long oldstate);
void (*cond_sync_full)(struct rcu_gp_oldstate *rgosp);
+ int poll_active;
+ int poll_active_full;
call_rcu_func_t call;
void (*cb_barrier)(void);
void (*fqs)(void);
@@ -558,6 +560,8 @@ static struct rcu_torture_ops rcu_ops = {
.poll_need_2gp = rcu_poll_need_2gp,
.cond_sync = cond_synchronize_rcu,
.cond_sync_full = cond_synchronize_rcu_full,
+ .poll_active = NUM_ACTIVE_RCU_POLL_OLDSTATE,
+ .poll_active_full = NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE,
.get_gp_state_exp = get_state_synchronize_rcu,
.start_gp_poll_exp = start_poll_synchronize_rcu_expedited,
.start_gp_poll_exp_full = start_poll_synchronize_rcu_expedited_full,
@@ -741,6 +745,7 @@ static struct rcu_torture_ops srcu_ops = {
.get_gp_state = srcu_torture_get_gp_state,
.start_gp_poll = srcu_torture_start_gp_poll,
.poll_gp_state = srcu_torture_poll_gp_state,
+ .poll_active = NUM_ACTIVE_SRCU_POLL_OLDSTATE,
.call = srcu_torture_call,
.cb_barrier = srcu_torture_barrier,
.stats = srcu_torture_stats,
@@ -783,6 +788,7 @@ static struct rcu_torture_ops srcud_ops = {
.get_gp_state = srcu_torture_get_gp_state,
.start_gp_poll = srcu_torture_start_gp_poll,
.poll_gp_state = srcu_torture_poll_gp_state,
+ .poll_active = NUM_ACTIVE_SRCU_POLL_OLDSTATE,
.call = srcu_torture_call,
.cb_barrier = srcu_torture_barrier,
.stats = srcu_torture_stats,
@@ -1374,13 +1380,15 @@ rcu_torture_writer(void *arg)
int i;
int idx;
int oldnice = task_nice(current);
- struct rcu_gp_oldstate rgo[NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE];
+ struct rcu_gp_oldstate *rgo = NULL;
+ int rgo_size = 0;
struct rcu_torture *rp;
struct rcu_torture *old_rp;
static DEFINE_TORTURE_RANDOM(rand);
unsigned long stallsdone = jiffies;
bool stutter_waited;
- unsigned long ulo[NUM_ACTIVE_RCU_POLL_OLDSTATE];
+ unsigned long *ulo = NULL;
+ int ulo_size = 0;
// If a new stall test is added, this must be adjusted.
if (stall_cpu_holdoff + stall_gp_kthread + stall_cpu)
@@ -1401,6 +1409,16 @@ rcu_torture_writer(void *arg)
torture_kthread_stopping("rcu_torture_writer");
return 0;
}
+ if (cur_ops->poll_active > 0) {
+ ulo = kzalloc(cur_ops->poll_active * sizeof(ulo[0]), GFP_KERNEL);
+ if (!WARN_ON(!ulo))
+ ulo_size = cur_ops->poll_active;
+ }
+ if (cur_ops->poll_active_full > 0) {
+ rgo = kzalloc(cur_ops->poll_active_full * sizeof(rgo[0]), GFP_KERNEL);
+ if (!WARN_ON(!rgo))
+ rgo_size = cur_ops->poll_active_full;
+ }
do {
rcu_torture_writer_state = RTWS_FIXED_DELAY;
@@ -1502,19 +1520,19 @@ rcu_torture_writer(void *arg)
break;
case RTWS_POLL_GET:
rcu_torture_writer_state = RTWS_POLL_GET;
- for (i = 0; i < ARRAY_SIZE(ulo); i++)
+ for (i = 0; i < ulo_size; i++)
ulo[i] = cur_ops->get_comp_state();
gp_snap = cur_ops->start_gp_poll();
rcu_torture_writer_state = RTWS_POLL_WAIT;
while (!cur_ops->poll_gp_state(gp_snap)) {
gp_snap1 = cur_ops->get_gp_state();
- for (i = 0; i < ARRAY_SIZE(ulo); i++)
+ for (i = 0; i < ulo_size; i++)
if (cur_ops->poll_gp_state(ulo[i]) ||
cur_ops->same_gp_state(ulo[i], gp_snap1)) {
ulo[i] = gp_snap1;
break;
}
- WARN_ON_ONCE(i >= ARRAY_SIZE(ulo));
+ WARN_ON_ONCE(ulo_size > 0 && i >= ulo_size);
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
@@ -1522,20 +1540,20 @@ rcu_torture_writer(void *arg)
break;
case RTWS_POLL_GET_FULL:
rcu_torture_writer_state = RTWS_POLL_GET_FULL;
- for (i = 0; i < ARRAY_SIZE(rgo); i++)
+ for (i = 0; i < rgo_size; i++)
cur_ops->get_comp_state_full(&rgo[i]);
cur_ops->start_gp_poll_full(&gp_snap_full);
rcu_torture_writer_state = RTWS_POLL_WAIT_FULL;
while (!cur_ops->poll_gp_state_full(&gp_snap_full)) {
cur_ops->get_gp_state_full(&gp_snap1_full);
- for (i = 0; i < ARRAY_SIZE(rgo); i++)
+ for (i = 0; i < rgo_size; i++)
if (cur_ops->poll_gp_state_full(&rgo[i]) ||
cur_ops->same_gp_state_full(&rgo[i],
&gp_snap1_full)) {
rgo[i] = gp_snap1_full;
break;
}
- WARN_ON_ONCE(i >= ARRAY_SIZE(rgo));
+ WARN_ON_ONCE(rgo_size > 0 && i >= rgo_size);
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
@@ -1617,6 +1635,8 @@ rcu_torture_writer(void *arg)
pr_alert("%s" TORTURE_FLAG
" Dynamic grace-period expediting was disabled.\n",
torture_type);
+ kfree(ulo);
+ kfree(rgo);
rcu_torture_writer_state = RTWS_STOPPING;
torture_kthread_stopping("rcu_torture_writer");
return 0;
--
2.40.1
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