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[PATCH] add success/failure indication to RCU torture test 

One issue with the RCU torture test is that the current error flagging can
be lost in dmesg.  This patch adds a "SUCCESS"/"FAILURE" string to the line
that flags the end of the test, where it can easily be seen with "dmesg |
tail" at the end of the test.  Also adds tests of architecture-specific
memory barriers -- or, more likely, of the RCU torture test itself.

Cc: <vatsa@in.ibm.com>
Signed-off-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul E. McKenney 2005-11-18 01:10:50 -08:00 committed by Linus Torvalds
parent 2463ade2cb
commit 996417d2c4
1 changed files with 24 additions and 6 deletions
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32
kernel/rcutorture.c
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@ -80,6 +80,7 @@ struct rcu_torture {
struct rcu_head rtort_rcu;
int rtort_pipe_count;
struct list_head rtort_free;
int rtort_mbtest;
};
static int fullstop = 0; /* stop generating callbacks at test end. */
@ -96,6 +97,8 @@ static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1];
atomic_t n_rcu_torture_alloc;
atomic_t n_rcu_torture_alloc_fail;
atomic_t n_rcu_torture_free;
atomic_t n_rcu_torture_mberror;
atomic_t n_rcu_torture_error;
/*
* Allocate an element from the rcu_tortures pool.
@ -145,9 +148,10 @@ rcu_torture_cb(struct rcu_head *p)
if (i > RCU_TORTURE_PIPE_LEN)
i = RCU_TORTURE_PIPE_LEN;
atomic_inc(&rcu_torture_wcount[i]);
if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN)
if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) {
rp->rtort_mbtest = 0;
rcu_torture_free(rp);
else
} else
call_rcu(p, rcu_torture_cb);
}
@ -206,6 +210,7 @@ rcu_torture_writer(void *arg)
rp->rtort_pipe_count = 0;
udelay(rcu_random(&rand) & 0x3ff);
old_rp = rcu_torture_current;
rp->rtort_mbtest = 1;
rcu_assign_pointer(rcu_torture_current, rp);
smp_wmb();
if (old_rp != NULL) {
@ -252,6 +257,8 @@ rcu_torture_reader(void *arg)
schedule_timeout_interruptible(HZ);
continue;
}
if (p->rtort_mbtest == 0)
atomic_inc(&n_rcu_torture_mberror);
udelay(rcu_random(&rand) & 0x7f);
preempt_disable();
pipe_count = p->rtort_pipe_count;
@ -300,16 +307,22 @@ rcu_torture_printk(char *page)
}
cnt += sprintf(&page[cnt], "rcutorture: ");
cnt += sprintf(&page[cnt],
"rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d",
"rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d "
"rtmbe: %d",
rcu_torture_current,
rcu_torture_current_version,
list_empty(&rcu_torture_freelist),
atomic_read(&n_rcu_torture_alloc),
atomic_read(&n_rcu_torture_alloc_fail),
atomic_read(&n_rcu_torture_free));
cnt += sprintf(&page[cnt], "\nrcutorture: ");
if (i > 1)
atomic_read(&n_rcu_torture_free),
atomic_read(&n_rcu_torture_mberror));
if (atomic_read(&n_rcu_torture_mberror) != 0)
cnt += sprintf(&page[cnt], " !!!");
cnt += sprintf(&page[cnt], "\nrcutorture: ");
if (i > 1) {
cnt += sprintf(&page[cnt], "!!! ");
atomic_inc(&n_rcu_torture_error);
}
cnt += sprintf(&page[cnt], "Reader Pipe: ");
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++)
cnt += sprintf(&page[cnt], " %ld", pipesummary[i]);
@ -400,7 +413,9 @@ rcu_torture_cleanup(void)
for (i = 0; i < RCU_TORTURE_PIPE_LEN; i++)
synchronize_rcu();
rcu_torture_stats_print(); /* -After- the stats thread is stopped! */
PRINTK_STRING("--- End of test");
printk(KERN_ALERT TORTURE_FLAG
"--- End of test: %s\n",
atomic_read(&n_rcu_torture_error) == 0 ? "SUCCESS" : "FAILURE");
}
static int
@ -425,6 +440,7 @@ rcu_torture_init(void)
INIT_LIST_HEAD(&rcu_torture_freelist);
for (i = 0; i < sizeof(rcu_tortures) / sizeof(rcu_tortures[0]); i++) {
rcu_tortures[i].rtort_mbtest = 0;
list_add_tail(&rcu_tortures[i].rtort_free,
&rcu_torture_freelist);
}
@ -436,6 +452,8 @@ rcu_torture_init(void)
atomic_set(&n_rcu_torture_alloc, 0);
atomic_set(&n_rcu_torture_alloc_fail, 0);
atomic_set(&n_rcu_torture_free, 0);
atomic_set(&n_rcu_torture_mberror, 0);
atomic_set(&n_rcu_torture_error, 0);
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++)
atomic_set(&rcu_torture_wcount[i], 0);
for_each_cpu(cpu) {