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rcutorture: Break up too-long rcu_torture_fwd_prog() function
This commit splits rcu_torture_fwd_prog_nr() and rcu_torture_fwd_prog_cr() functions out of rcu_torture_fwd_prog() in order to reduce indentation pain and because rcu_torture_fwd_prog() was getting a bit too long. In addition, this will enable easier conditional execution of the rcu_torture_fwd_prog_cr() function, which can give false-positive failures in some NO_HZ_FULL configurations due to overloading the housekeeping CPUs. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
Paul E. McKenney
parent
fc6f9c5778
commit
6b3de7a172
1 changed files with 135 additions and 119 deletions
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@ -1650,15 +1650,70 @@ static void rcu_torture_fwd_cb_cr(struct rcu_head *rhp)
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spin_unlock(&rcu_fwd_lock);
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}
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/* Carry out grace-period forward-progress testing. */
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static int rcu_torture_fwd_prog(void *args)
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/* Carry out need_resched()/cond_resched() forward-progress testing. */
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static void rcu_torture_fwd_prog_nr(int *tested, int *tested_tries)
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{
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unsigned long cver;
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unsigned long dur;
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struct fwd_cb_state fcs;
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unsigned long gps;
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int i;
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int idx;
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int sd;
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int sd4;
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bool selfpropcb = false;
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unsigned long stopat;
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static DEFINE_TORTURE_RANDOM(trs);
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if (cur_ops->call && cur_ops->sync && cur_ops->cb_barrier) {
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init_rcu_head_on_stack(&fcs.rh);
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selfpropcb = true;
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}
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/* Tight loop containing cond_resched(). */
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if (selfpropcb) {
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WRITE_ONCE(fcs.stop, 0);
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cur_ops->call(&fcs.rh, rcu_torture_fwd_prog_cb);
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}
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cver = READ_ONCE(rcu_torture_current_version);
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gps = cur_ops->get_gp_seq();
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sd = cur_ops->stall_dur() + 1;
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sd4 = (sd + fwd_progress_div - 1) / fwd_progress_div;
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dur = sd4 + torture_random(&trs) % (sd - sd4);
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rcu_fwd_startat = jiffies;
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stopat = rcu_fwd_startat + dur;
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while (time_before(jiffies, stopat) && !torture_must_stop()) {
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idx = cur_ops->readlock();
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udelay(10);
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cur_ops->readunlock(idx);
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if (!fwd_progress_need_resched || need_resched())
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cond_resched();
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}
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(*tested_tries)++;
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if (!time_before(jiffies, stopat) && !torture_must_stop()) {
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(*tested)++;
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cver = READ_ONCE(rcu_torture_current_version) - cver;
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gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps);
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WARN_ON(!cver && gps < 2);
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pr_alert("%s: Duration %ld cver %ld gps %ld\n", __func__, dur, cver, gps);
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}
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if (selfpropcb) {
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WRITE_ONCE(fcs.stop, 1);
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cur_ops->sync(); /* Wait for running CB to complete. */
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cur_ops->cb_barrier(); /* Wait for queued callbacks. */
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}
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if (selfpropcb) {
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WARN_ON(READ_ONCE(fcs.stop) != 2);
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destroy_rcu_head_on_stack(&fcs.rh);
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}
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}
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/* Carry out call_rcu() forward-progress testing. */
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static void rcu_torture_fwd_prog_cr(void)
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{
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unsigned long cver;
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unsigned long gps;
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int i;
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int j;
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long n_launders;
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long n_launders_cb_snap;
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@ -1667,136 +1722,97 @@ static int rcu_torture_fwd_prog(void *args)
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long n_max_gps;
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struct rcu_fwd_cb *rfcp;
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struct rcu_fwd_cb *rfcpn;
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int sd;
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int sd4;
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bool selfpropcb = false;
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unsigned long stopat;
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unsigned long stoppedat;
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/* Loop continuously posting RCU callbacks. */
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WRITE_ONCE(rcu_fwd_cb_nodelay, true);
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cur_ops->sync(); /* Later readers see above write. */
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rcu_fwd_startat = jiffies;
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stopat = rcu_fwd_startat + MAX_FWD_CB_JIFFIES;
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n_launders = 0;
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n_launders_cb = 0;
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n_launders_sa = 0;
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n_max_cbs = 0;
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n_max_gps = 0;
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for (i = 0; i < ARRAY_SIZE(n_launders_hist); i++)
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n_launders_hist[i] = 0;
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cver = READ_ONCE(rcu_torture_current_version);
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gps = cur_ops->get_gp_seq();
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while (time_before(jiffies, stopat) && !torture_must_stop()) {
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rfcp = READ_ONCE(rcu_fwd_cb_head);
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rfcpn = NULL;
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if (rfcp)
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rfcpn = READ_ONCE(rfcp->rfc_next);
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if (rfcpn) {
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if (rfcp->rfc_gps >= MIN_FWD_CB_LAUNDERS &&
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++n_max_gps >= MIN_FWD_CBS_LAUNDERED)
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break;
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rcu_fwd_cb_head = rfcpn;
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n_launders++;
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n_launders_sa++;
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} else {
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rfcp = kmalloc(sizeof(*rfcp), GFP_KERNEL);
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if (WARN_ON_ONCE(!rfcp)) {
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schedule_timeout_interruptible(1);
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continue;
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}
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n_max_cbs++;
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n_launders_sa = 0;
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rfcp->rfc_gps = 0;
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}
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cur_ops->call(&rfcp->rh, rcu_torture_fwd_cb_cr);
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cond_resched();
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}
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stoppedat = jiffies;
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n_launders_cb_snap = READ_ONCE(n_launders_cb);
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cver = READ_ONCE(rcu_torture_current_version) - cver;
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gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps);
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cur_ops->cb_barrier(); /* Wait for callbacks to be invoked. */
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for (;;) {
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rfcp = rcu_fwd_cb_head;
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if (!rfcp)
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break;
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rcu_fwd_cb_head = rfcp->rfc_next;
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kfree(rfcp);
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}
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rcu_fwd_cb_tail = &rcu_fwd_cb_head;
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WRITE_ONCE(rcu_fwd_cb_nodelay, false);
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if (!torture_must_stop()) {
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WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED);
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pr_alert("%s Duration %lu barrier: %lu pending %ld n_launders: %ld n_launders_sa: %ld n_max_gps: %ld n_max_cbs: %ld cver %ld gps %ld\n",
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__func__,
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stoppedat - rcu_fwd_startat, jiffies - stoppedat,
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n_launders + n_max_cbs - n_launders_cb_snap,
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n_launders, n_launders_sa,
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n_max_gps, n_max_cbs, cver, gps);
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for (i = ARRAY_SIZE(n_launders_hist) - 1; i > 0; i--)
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if (n_launders_hist[i] > 0)
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break;
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pr_alert("Callback-invocation histogram:");
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for (j = 0; j <= i; j++)
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pr_cont(" %ds: %ld", j + 1, n_launders_hist[j]);
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pr_cont("\n");
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}
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}
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/* Carry out grace-period forward-progress testing. */
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static int rcu_torture_fwd_prog(void *args)
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{
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int tested = 0;
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int tested_tries = 0;
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static DEFINE_TORTURE_RANDOM(trs);
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VERBOSE_TOROUT_STRING("rcu_torture_fwd_progress task started");
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if (!IS_ENABLED(CONFIG_SMP) || !IS_ENABLED(CONFIG_RCU_BOOST))
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set_user_nice(current, MAX_NICE);
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if (cur_ops->call && cur_ops->sync && cur_ops->cb_barrier) {
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init_rcu_head_on_stack(&fcs.rh);
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selfpropcb = true;
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}
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do {
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schedule_timeout_interruptible(fwd_progress_holdoff * HZ);
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/* Tight loop containing cond_resched(). */
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if (selfpropcb) {
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WRITE_ONCE(fcs.stop, 0);
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cur_ops->call(&fcs.rh, rcu_torture_fwd_prog_cb);
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}
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cver = READ_ONCE(rcu_torture_current_version);
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gps = cur_ops->get_gp_seq();
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sd = cur_ops->stall_dur() + 1;
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sd4 = (sd + fwd_progress_div - 1) / fwd_progress_div;
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dur = sd4 + torture_random(&trs) % (sd - sd4);
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rcu_fwd_startat = jiffies;
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stopat = rcu_fwd_startat + dur;
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while (time_before(jiffies, stopat) && !torture_must_stop()) {
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idx = cur_ops->readlock();
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udelay(10);
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cur_ops->readunlock(idx);
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if (!fwd_progress_need_resched || need_resched())
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cond_resched();
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}
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tested_tries++;
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if (!time_before(jiffies, stopat) && !torture_must_stop()) {
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tested++;
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cver = READ_ONCE(rcu_torture_current_version) - cver;
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gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps);
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WARN_ON(!cver && gps < 2);
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pr_alert("%s: Duration %ld cver %ld gps %ld\n", __func__, dur, cver, gps);
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}
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if (selfpropcb) {
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WRITE_ONCE(fcs.stop, 1);
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cur_ops->sync(); /* Wait for running CB to complete. */
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cur_ops->cb_barrier(); /* Wait for queued callbacks. */
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}
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/* Loop continuously posting RCU callbacks. */
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WRITE_ONCE(rcu_fwd_cb_nodelay, true);
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cur_ops->sync(); /* Later readers see above write. */
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rcu_fwd_startat = jiffies;
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stopat = rcu_fwd_startat + MAX_FWD_CB_JIFFIES;
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n_launders = 0;
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n_launders_cb = 0;
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n_launders_sa = 0;
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n_max_cbs = 0;
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n_max_gps = 0;
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for (i = 0; i < ARRAY_SIZE(n_launders_hist); i++)
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n_launders_hist[i] = 0;
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cver = READ_ONCE(rcu_torture_current_version);
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gps = cur_ops->get_gp_seq();
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while (time_before(jiffies, stopat) && !torture_must_stop()) {
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rfcp = READ_ONCE(rcu_fwd_cb_head);
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rfcpn = NULL;
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if (rfcp)
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rfcpn = READ_ONCE(rfcp->rfc_next);
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if (rfcpn) {
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if (rfcp->rfc_gps >= MIN_FWD_CB_LAUNDERS &&
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++n_max_gps >= MIN_FWD_CBS_LAUNDERED)
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break;
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rcu_fwd_cb_head = rfcpn;
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n_launders++;
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n_launders_sa++;
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} else {
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rfcp = kmalloc(sizeof(*rfcp), GFP_KERNEL);
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if (WARN_ON_ONCE(!rfcp)) {
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schedule_timeout_interruptible(1);
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continue;
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}
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n_max_cbs++;
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n_launders_sa = 0;
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rfcp->rfc_gps = 0;
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}
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cur_ops->call(&rfcp->rh, rcu_torture_fwd_cb_cr);
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cond_resched();
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}
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stoppedat = jiffies;
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n_launders_cb_snap = READ_ONCE(n_launders_cb);
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cver = READ_ONCE(rcu_torture_current_version) - cver;
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gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps);
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cur_ops->cb_barrier(); /* Wait for callbacks to be invoked. */
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for (;;) {
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rfcp = rcu_fwd_cb_head;
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if (!rfcp)
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break;
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rcu_fwd_cb_head = rfcp->rfc_next;
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kfree(rfcp);
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}
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rcu_fwd_cb_tail = &rcu_fwd_cb_head;
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WRITE_ONCE(rcu_fwd_cb_nodelay, false);
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if (!torture_must_stop()) {
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WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED);
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pr_alert("%s Duration %lu barrier: %lu pending %ld n_launders: %ld n_launders_sa: %ld n_max_gps: %ld n_max_cbs: %ld cver %ld gps %ld\n",
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__func__,
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stoppedat - rcu_fwd_startat,
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jiffies - stoppedat,
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n_launders + n_max_cbs - n_launders_cb_snap,
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n_launders, n_launders_sa,
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n_max_gps, n_max_cbs, cver, gps);
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for (i = ARRAY_SIZE(n_launders_hist) - 1; i > 0; i--)
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if (n_launders_hist[i] > 0)
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break;
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pr_alert("Callback-invocation histogram:");
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for (j = 0; j <= i; j++)
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pr_cont(" %ds: %ld", j + 1, n_launders_hist[j]);
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pr_cont("\n");
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}
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rcu_torture_fwd_prog_nr(&tested, &tested_tries);
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rcu_torture_fwd_prog_cr();
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/* Avoid slow periods, better to test when busy. */
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stutter_wait("rcu_torture_fwd_prog");
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} while (!torture_must_stop());
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if (selfpropcb) {
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WARN_ON(READ_ONCE(fcs.stop) != 2);
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destroy_rcu_head_on_stack(&fcs.rh);
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}
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/* Short runs might not contain a valid forward-progress attempt. */
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WARN_ON(!tested && tested_tries >= 5);
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pr_alert("%s: tested %d tested_tries %d\n", __func__, tested, tested_tries);
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