diff options
Diffstat (limited to 'kernel/rcu/torture.c')
| -rw-r--r-- | kernel/rcu/torture.c | 67 |
1 files changed, 34 insertions, 33 deletions
diff --git a/kernel/rcu/torture.c b/kernel/rcu/torture.c index 69a4ec80a78..732f8ae3086 100644 --- a/kernel/rcu/torture.c +++ b/kernel/rcu/torture.c @@ -139,8 +139,6 @@ MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); #define VERBOSE_PRINTK_ERRSTRING(s) \ do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0) -static char printk_buf[4096]; - static int nrealreaders; static struct task_struct *writer_task; static struct task_struct **fakewriter_tasks; @@ -376,7 +374,7 @@ struct rcu_torture_ops { void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); void (*cb_barrier)(void); void (*fqs)(void); - int (*stats)(char *page); + void (*stats)(char *page); int irq_capable; int can_boost; const char *name; @@ -578,21 +576,19 @@ static void srcu_torture_barrier(void) srcu_barrier(&srcu_ctl); } -static int srcu_torture_stats(char *page) +static void srcu_torture_stats(char *page) { - int cnt = 0; int cpu; int idx = srcu_ctl.completed & 0x1; - cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", + page += sprintf(page, "%s%s per-CPU(idx=%d):", torture_type, TORTURE_FLAG, idx); for_each_possible_cpu(cpu) { - cnt += sprintf(&page[cnt], " %d(%lu,%lu)", cpu, + page += sprintf(page, " %d(%lu,%lu)", cpu, per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); } - cnt += sprintf(&page[cnt], "\n"); - return cnt; + sprintf(page, "\n"); } static void srcu_torture_synchronize_expedited(void) @@ -1052,10 +1048,9 @@ rcu_torture_reader(void *arg) /* * Create an RCU-torture statistics message in the specified buffer. */ -static int +static void rcu_torture_printk(char *page) { - int cnt = 0; int cpu; int i; long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; @@ -1071,8 +1066,8 @@ rcu_torture_printk(char *page) if (pipesummary[i] != 0) break; } - cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); - cnt += sprintf(&page[cnt], + page += sprintf(page, "%s%s ", torture_type, TORTURE_FLAG); + page += sprintf(page, "rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", rcu_torture_current, rcu_torture_current_version, @@ -1080,53 +1075,52 @@ rcu_torture_printk(char *page) atomic_read(&n_rcu_torture_alloc), atomic_read(&n_rcu_torture_alloc_fail), atomic_read(&n_rcu_torture_free)); - cnt += sprintf(&page[cnt], "rtmbe: %d rtbke: %ld rtbre: %ld ", + page += sprintf(page, "rtmbe: %d rtbke: %ld rtbre: %ld ", atomic_read(&n_rcu_torture_mberror), n_rcu_torture_boost_ktrerror, n_rcu_torture_boost_rterror); - cnt += sprintf(&page[cnt], "rtbf: %ld rtb: %ld nt: %ld ", + page += sprintf(page, "rtbf: %ld rtb: %ld nt: %ld ", n_rcu_torture_boost_failure, n_rcu_torture_boosts, n_rcu_torture_timers); - cnt += sprintf(&page[cnt], + page += sprintf(page, "onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", n_online_successes, n_online_attempts, n_offline_successes, n_offline_attempts, min_online, max_online, min_offline, max_offline, sum_online, sum_offline, HZ); - cnt += sprintf(&page[cnt], "barrier: %ld/%ld:%ld", + page += sprintf(page, "barrier: %ld/%ld:%ld", n_barrier_successes, n_barrier_attempts, n_rcu_torture_barrier_error); - cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); + page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); if (atomic_read(&n_rcu_torture_mberror) != 0 || n_rcu_torture_barrier_error != 0 || n_rcu_torture_boost_ktrerror != 0 || n_rcu_torture_boost_rterror != 0 || n_rcu_torture_boost_failure != 0 || i > 1) { - cnt += sprintf(&page[cnt], "!!! "); + page += sprintf(page, "!!! "); atomic_inc(&n_rcu_torture_error); WARN_ON_ONCE(1); } - cnt += sprintf(&page[cnt], "Reader Pipe: "); + page += sprintf(page, "Reader Pipe: "); for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) - cnt += sprintf(&page[cnt], " %ld", pipesummary[i]); - cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); - cnt += sprintf(&page[cnt], "Reader Batch: "); + page += sprintf(page, " %ld", pipesummary[i]); + page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); + page += sprintf(page, "Reader Batch: "); for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) - cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); - cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); - cnt += sprintf(&page[cnt], "Free-Block Circulation: "); + page += sprintf(page, " %ld", batchsummary[i]); + page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); + page += sprintf(page, "Free-Block Circulation: "); for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { - cnt += sprintf(&page[cnt], " %d", + page += sprintf(page, " %d", atomic_read(&rcu_torture_wcount[i])); } - cnt += sprintf(&page[cnt], "\n"); + page += sprintf(page, "\n"); if (cur_ops->stats) - cnt += cur_ops->stats(&page[cnt]); - return cnt; + cur_ops->stats(page); } /* @@ -1140,10 +1134,17 @@ rcu_torture_printk(char *page) static void rcu_torture_stats_print(void) { - int cnt; + int size = nr_cpu_ids * 200 + 8192; + char *buf; - cnt = rcu_torture_printk(printk_buf); - pr_alert("%s", printk_buf); + buf = kmalloc(size, GFP_KERNEL); + if (!buf) { + pr_err("rcu-torture: Out of memory, need: %d", size); + return; + } + rcu_torture_printk(buf); + pr_alert("%s", buf); + kfree(buf); } /* |