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rcutorture: Add ftrace-compatible timestamp to GP# failure/close-call output

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This commit adds an ftrace-compatible microsecond-scale timestamp
to the failure/close-call output, but only in kernels built with
CONFIG_RCU_TORTURE_TEST_LOG_GP=y.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Paul E. McKenney 2024-12-05 14:41:55 -08:00 committed by Boqun Feng
parent a8f7c9c457
commit 65e6ff0f31
1 changed files with 7 additions and 1 deletions
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8
kernel/rcu/rcutorture.c
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@ -275,6 +275,7 @@ struct rt_read_seg {
int rt_end_cpu;
unsigned long long rt_gp_seq;
unsigned long long rt_gp_seq_end;
u64 rt_ts;
};
static int err_segs_recorded;
static struct rt_read_seg err_segs[RCUTORTURE_RDR_MAX_SEGS];
@ -1989,6 +1990,7 @@ static void rcutorture_one_extend(int *readstate, int newstate, bool insoftirq,
// Sample grace-period sequence number, as good a place as any.
if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP) && cur_ops->gather_gp_seqs) {
rtrsp->rt_gp_seq = cur_ops->gather_gp_seqs();
rtrsp->rt_ts = ktime_get_mono_fast_ns();
if (!first)
rtrsp[-1].rt_gp_seq_end = rtrsp->rt_gp_seq;
}
@ -3663,7 +3665,11 @@ rcu_torture_cleanup(void)
pr_alert("\t: No segments recorded!!!\n");
firsttime = 1;
for (i = 0; i < rt_read_nsegs; i++) {
pr_alert("\t%d: %#4x", i, err_segs[i].rt_readstate);
if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP))
pr_alert("\t%lluus ", div64_u64(err_segs[i].rt_ts, 1000ULL));
else
pr_alert("\t");
pr_cont("%d: %#4x", i, err_segs[i].rt_readstate);
if (err_segs[i].rt_delay_jiffies != 0) {
pr_cont("%s%ldjiffies", firsttime ? "" : "+",
err_segs[i].rt_delay_jiffies);