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-rw-r--r--kernel/scftorture.c76
1 files changed, 63 insertions, 13 deletions
diff --git a/kernel/scftorture.c b/kernel/scftorture.c
index 29e8fc5d91a7..5cf40e438319 100644
--- a/kernel/scftorture.c
+++ b/kernel/scftorture.c
@@ -64,6 +64,7 @@ torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU
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_rpc, -1, "Testing weight for single-CPU RPC 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.");
torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations.");
@@ -86,6 +87,8 @@ struct scf_statistics {
long long n_resched;
long long n_single;
long long n_single_ofl;
+ long long n_single_rpc;
+ long long n_single_rpc_ofl;
long long n_single_wait;
long long n_single_wait_ofl;
long long n_many;
@@ -101,14 +104,17 @@ static DEFINE_PER_CPU(long long, scf_invoked_count);
// Data for random primitive selection
#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.
+#define SCF_PRIM_SINGLE_RPC 2
+#define SCF_PRIM_MANY 3
+#define SCF_PRIM_ALL 4
+#define SCF_NPRIMS 8 // Need wait and no-wait versions of each,
+ // except for SCF_PRIM_RESCHED and
+ // SCF_PRIM_SINGLE_RPC.
static char *scf_prim_name[] = {
"resched_cpu",
"smp_call_function_single",
+ "smp_call_function_single_rpc",
"smp_call_function_many",
"smp_call_function",
};
@@ -128,6 +134,8 @@ struct scf_check {
bool scfc_out;
int scfc_cpu; // -1 for not _single().
bool scfc_wait;
+ bool scfc_rpc;
+ struct completion scfc_completion;
};
// Use to wait for all threads to start.
@@ -158,6 +166,7 @@ static void scf_torture_stats_print(void)
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_rpc += scf_stats_p[i].n_single_rpc;
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;
@@ -168,9 +177,10 @@ 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 resched: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ",
+ pr_alert("%s %sscf_invoked_count %s: %lld resched: %lld single: %lld/%lld single_ofl: %lld/%lld single_rpc: %lld single_rpc_ofl: %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_single_rpc, scfs.n_single_rpc_ofl,
scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait);
torture_onoff_stats();
pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs),
@@ -282,10 +292,13 @@ static void scf_handler(void *scfc_in)
out:
if (unlikely(!scfcp))
return;
- if (scfcp->scfc_wait)
+ if (scfcp->scfc_wait) {
WRITE_ONCE(scfcp->scfc_out, true);
- else
+ if (scfcp->scfc_rpc)
+ complete(&scfcp->scfc_completion);
+ } else {
kfree(scfcp);
+ }
}
// As above, but check for correct CPU.
@@ -319,6 +332,7 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
scfcp->scfc_cpu = -1;
scfcp->scfc_wait = scfsp->scfs_wait;
scfcp->scfc_out = false;
+ scfcp->scfc_rpc = false;
}
}
switch (scfsp->scfs_prim) {
@@ -350,6 +364,34 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
scfcp = NULL;
}
break;
+ case SCF_PRIM_SINGLE_RPC:
+ if (!scfcp)
+ break;
+ cpu = torture_random(trsp) % nr_cpu_ids;
+ scfp->n_single_rpc++;
+ scfcp->scfc_cpu = cpu;
+ scfcp->scfc_wait = true;
+ init_completion(&scfcp->scfc_completion);
+ scfcp->scfc_rpc = true;
+ barrier(); // Prevent race-reduction compiler optimizations.
+ scfcp->scfc_in = true;
+ ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0);
+ if (!ret) {
+ if (use_cpus_read_lock)
+ cpus_read_unlock();
+ else
+ preempt_enable();
+ wait_for_completion(&scfcp->scfc_completion);
+ if (use_cpus_read_lock)
+ cpus_read_lock();
+ else
+ preempt_disable();
+ } else {
+ scfp->n_single_rpc_ofl++;
+ kfree(scfcp);
+ scfcp = NULL;
+ }
+ break;
case SCF_PRIM_MANY:
if (scfsp->scfs_wait)
scfp->n_many_wait++;
@@ -379,10 +421,12 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
}
if (scfcp && scfsp->scfs_wait) {
if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) &&
- !scfcp->scfc_out))
+ !scfcp->scfc_out)) {
+ pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim);
atomic_inc(&n_mb_out_errs); // Leak rather than trash!
- else
+ } else {
kfree(scfcp);
+ }
barrier(); // Prevent race-reduction compiler optimizations.
}
if (use_cpus_read_lock)
@@ -453,8 +497,8 @@ 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=%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, use_cpus_read_lock, weight_resched, 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=%d use_cpus_read_lock=%d, weight_resched=%d, weight_single=%d, weight_single_rpc=%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, use_cpus_read_lock, weight_resched, weight_single, weight_single_rpc, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait);
}
static void scf_cleanup_handler(void *unused)
@@ -497,6 +541,7 @@ static int __init scf_torture_init(void)
int firsterr = 0;
unsigned long weight_resched1 = weight_resched;
unsigned long weight_single1 = weight_single;
+ unsigned long weight_single_rpc1 = weight_single_rpc;
unsigned long weight_single_wait1 = weight_single_wait;
unsigned long weight_many1 = weight_many;
unsigned long weight_many_wait1 = weight_many_wait;
@@ -508,11 +553,13 @@ static int __init scf_torture_init(void)
scftorture_print_module_parms("Start of test");
- if (weight_resched == -1 && weight_single == -1 && weight_single_wait == -1 &&
+ if (weight_resched == -1 &&
+ weight_single == -1 && weight_single_rpc == -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_rpc1 = 2 * nr_cpu_ids;
weight_single_wait1 = 2 * nr_cpu_ids;
weight_many1 = 2;
weight_many_wait1 = 2;
@@ -523,6 +570,8 @@ static int __init scf_torture_init(void)
weight_resched1 = 0;
if (weight_single == -1)
weight_single1 = 0;
+ if (weight_single_rpc == -1)
+ weight_single_rpc1 = 0;
if (weight_single_wait == -1)
weight_single_wait1 = 0;
if (weight_many == -1)
@@ -534,7 +583,7 @@ static int __init scf_torture_init(void)
if (weight_all_wait == -1)
weight_all_wait1 = 0;
}
- if (weight_single1 == 0 && weight_single_wait1 == 0 &&
+ if (weight_single1 == 0 && weight_single_rpc1 == 0 && weight_single_wait1 == 0 &&
weight_many1 == 0 && weight_many_wait1 == 0 &&
weight_all1 == 0 && weight_all_wait1 == 0) {
VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense");
@@ -546,6 +595,7 @@ static int __init scf_torture_init(void)
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_rpc1, SCF_PRIM_SINGLE_RPC, true);
scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true);
scf_sel_add(weight_many1, SCF_PRIM_MANY, false);
scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true);
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