scftorture: Summarize per-thread statistics

This commit summarizes the per-thread statistics, providing counts of
the number of single, many, and all calls, both no-wait and wait, and,
for the single case, the number where the target CPU was offline.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/scftorture.c b/kernel/scftorture.c
index 5f19845..09a6242 100644 (file)
--- a/kernel/scftorture.c
+++ b/kernel/scftorture.c
@@ -128,13 +128,27 @@ DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand);
 static void scf_torture_stats_print(void)
 {
        int cpu;
+       int i;
        long long invoked_count = 0;
        bool isdone = READ_ONCE(scfdone);
+       struct scf_statistics scfs = {};
 
        for_each_possible_cpu(cpu)
                invoked_count += data_race(per_cpu(scf_invoked_count, cpu));
-       pr_alert("%s scf_invoked_count %s: %lld ",
-                SCFTORT_FLAG, isdone ? "VER" : "ver", invoked_count);
+       for (i = 0; i < nthreads; i++) {
+               scfs.n_single += scf_stats_p[i].n_single;
+               scfs.n_single_ofl += scf_stats_p[i].n_single_ofl;
+               scfs.n_single_wait += scf_stats_p[i].n_single_wait;
+               scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl;
+               scfs.n_many += scf_stats_p[i].n_many;
+               scfs.n_many_wait += scf_stats_p[i].n_many_wait;
+               scfs.n_all += scf_stats_p[i].n_all;
+               scfs.n_all_wait += scf_stats_p[i].n_all_wait;
+       }
+       pr_alert("%s scf_invoked_count %s: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ",
+                SCFTORT_FLAG, isdone ? "VER" : "ver", invoked_count,
+                scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl,
+                scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait);
        torture_onoff_stats();
        pr_cont("\n");
 }
@@ -357,11 +371,11 @@ static void scf_torture_cleanup(void)
                        torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task);
        else
                goto end;
-       kfree(scf_stats_p);
-       scf_stats_p = NULL;
        smp_call_function(scf_cleanup_handler, NULL, 0);
        torture_stop_kthread(scf_torture_stats, scf_torture_stats_task);
        scf_torture_stats_print();  // -After- the stats thread is stopped!
+       kfree(scf_stats_p);  // -After- the last stats print has completed!
+       scf_stats_p = NULL;
 
        if (atomic_read(&n_errs))
                scftorture_print_module_parms("End of test: FAILURE");