diff options
| -rw-r--r-- | kernel/scftorture.c | 41 |
1 files changed, 32 insertions, 9 deletions
diff --git a/kernel/scftorture.c b/kernel/scftorture.c index 554a521ee235..3fbb7a7f8afa 100644 --- a/kernel/scftorture.c +++ b/kernel/scftorture.c @@ -62,6 +62,7 @@ torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s torture_param(int, stutter_cpus, 5, "Number of jiffies to change CPUs under test, 0=disable"); torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug."); torture_param(int, verbose, 0, "Enable verbose debugging printk()s"); +torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations."); torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); @@ -82,6 +83,7 @@ torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test struct scf_statistics { struct task_struct *task; int cpu; + long long n_resched; long long n_single; long long n_single_ofl; long long n_single_wait; @@ -97,12 +99,15 @@ static struct task_struct *scf_torture_stats_task; static DEFINE_PER_CPU(long long, scf_invoked_count); // Data for random primitive selection -#define SCF_PRIM_SINGLE 0 -#define SCF_PRIM_MANY 1 -#define SCF_PRIM_ALL 2 -#define SCF_NPRIMS (2 * 3) // Need wait and no-wait versions of each. +#define SCF_PRIM_RESCHED 0 +#define SCF_PRIM_SINGLE 1 +#define SCF_PRIM_MANY 2 +#define SCF_PRIM_ALL 3 +#define SCF_NPRIMS 7 // Need wait and no-wait versions of each, + // except for SCF_PRIM_RESCHED. static char *scf_prim_name[] = { + "resched_cpu", "smp_call_function_single", "smp_call_function_many", "smp_call_function", @@ -136,6 +141,8 @@ static char *bangstr = ""; static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); +extern void resched_cpu(int cpu); // An alternative IPI vector. + // Print torture statistics. Caller must ensure serialization. static void scf_torture_stats_print(void) { @@ -148,6 +155,7 @@ static void scf_torture_stats_print(void) for_each_possible_cpu(cpu) invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); for (i = 0; i < nthreads; i++) { + scfs.n_resched += scf_stats_p[i].n_resched; 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; @@ -160,8 +168,8 @@ static void scf_torture_stats_print(void) if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) bangstr = "!!! "; - pr_alert("%s %sscf_invoked_count %s: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ", - SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, + pr_alert("%s %sscf_invoked_count %s: %lld resched: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ", + SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, 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(); @@ -314,6 +322,13 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra } } switch (scfsp->scfs_prim) { + case SCF_PRIM_RESCHED: + if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { + cpu = torture_random(trsp) % nr_cpu_ids; + scfp->n_resched++; + resched_cpu(cpu); + } + break; case SCF_PRIM_SINGLE: cpu = torture_random(trsp) % nr_cpu_ids; if (scfsp->scfs_wait) @@ -433,8 +448,8 @@ static void scftorture_print_module_parms(const char *tag) { pr_alert(SCFTORT_FLAG - "--- %s: verbose=%d holdoff=%d longwait=%d nthreads=%d onoff_holdoff=%d onoff_interval=%d shutdown_secs=%d stat_interval=%d stutter_cpus=%d use_cpus_read_lock=%d, weight_single=%d, weight_single_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag, - verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter_cpus, use_cpus_read_lock, weight_single, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait); + "--- %s: verbose=%d holdoff=%d longwait=%d nthreads=%d onoff_holdoff=%d onoff_interval=%d shutdown_secs=%d stat_interval=%d stutter_cpus=%d use_cpus_read_lock=%d, weight_resched=%d, weight_single=%d, weight_single_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag, + verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter_cpus, use_cpus_read_lock, weight_resched, weight_single, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait); } static void scf_cleanup_handler(void *unused) @@ -475,6 +490,7 @@ static int __init scf_torture_init(void) { long i; int firsterr = 0; + unsigned long weight_resched1 = weight_resched; unsigned long weight_single1 = weight_single; unsigned long weight_single_wait1 = weight_single_wait; unsigned long weight_many1 = weight_many; @@ -487,9 +503,10 @@ static int __init scf_torture_init(void) scftorture_print_module_parms("Start of test"); - if (weight_single == -1 && weight_single_wait == -1 && + if (weight_resched == -1 && weight_single == -1 && weight_single_wait == -1 && weight_many == -1 && weight_many_wait == -1 && weight_all == -1 && weight_all_wait == -1) { + weight_resched1 = 2 * nr_cpu_ids; weight_single1 = 2 * nr_cpu_ids; weight_single_wait1 = 2 * nr_cpu_ids; weight_many1 = 2; @@ -497,6 +514,8 @@ static int __init scf_torture_init(void) weight_all1 = 1; weight_all_wait1 = 1; } else { + if (weight_resched == -1) + weight_resched1 = 0; if (weight_single == -1) weight_single1 = 0; if (weight_single_wait == -1) @@ -517,6 +536,10 @@ static int __init scf_torture_init(void) firsterr = -EINVAL; goto unwind; } + if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) + scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); + else if (weight_resched1) + VERBOSE_SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); scf_sel_add(weight_many1, SCF_PRIM_MANY, false); |