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rcu: Fix the (t=0 jiffies) false positive 

It is possible that an over-long grace period will end while the RCU
CPU stall warning message is printing.  In this case, the estimate of
the offending grace period's duration can be erroneous due to refetching
of rcu_state.gp_start, which will now be the time of the newly started
grace period.  Computation of this duration clearly needs to use the
start time for the old over-long grace period, not the fresh new one.
This commit avoids such errors by causing both print_other_cpu_stall() and
print_cpu_stall() to reuse the value previously fetched by their caller.

Signed-off-by: Zhaolong Zhang <zhangzl2013@126.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Zhaolong Zhang 2020-03-05 14:56:11 -08:00 committed by Paul E. McKenney
parent 1fca4d12f4
commit fcbcc0e700
1 changed files with 6 additions and 6 deletions
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12
kernel/rcu/tree_stall.h
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@ -371,7 +371,7 @@ static void rcu_check_gp_kthread_starvation(void)
} }
} }
static void print_other_cpu_stall(unsigned long gp_seq) static void print_other_cpu_stall(unsigned long gp_seq, unsigned long gps)
{ {
int cpu; int cpu;
unsigned long flags; unsigned long flags;
@ -408,7 +408,7 @@ static void print_other_cpu_stall(unsigned long gp_seq)
for_each_possible_cpu(cpu) for_each_possible_cpu(cpu)
totqlen += rcu_get_n_cbs_cpu(cpu); totqlen += rcu_get_n_cbs_cpu(cpu);
pr_cont("\t(detected by %d, t=%ld jiffies, g=%ld, q=%lu)\n", pr_cont("\t(detected by %d, t=%ld jiffies, g=%ld, q=%lu)\n",
smp_processor_id(), (long)(jiffies - rcu_state.gp_start), smp_processor_id(), (long)(jiffies - gps),
(long)rcu_seq_current(&rcu_state.gp_seq), totqlen); (long)rcu_seq_current(&rcu_state.gp_seq), totqlen);
if (ndetected) { if (ndetected) {
rcu_dump_cpu_stacks(); rcu_dump_cpu_stacks();
@ -442,7 +442,7 @@ static void print_other_cpu_stall(unsigned long gp_seq)
rcu_force_quiescent_state(); /* Kick them all. */ rcu_force_quiescent_state(); /* Kick them all. */
} }
static void print_cpu_stall(void) static void print_cpu_stall(unsigned long gps)
{ {
int cpu; int cpu;
unsigned long flags; unsigned long flags;
@ -467,7 +467,7 @@ static void print_cpu_stall(void)
for_each_possible_cpu(cpu) for_each_possible_cpu(cpu)
totqlen += rcu_get_n_cbs_cpu(cpu); totqlen += rcu_get_n_cbs_cpu(cpu);
pr_cont("\t(t=%lu jiffies g=%ld q=%lu)\n", pr_cont("\t(t=%lu jiffies g=%ld q=%lu)\n",
jiffies - rcu_state.gp_start, jiffies - gps,
(long)rcu_seq_current(&rcu_state.gp_seq), totqlen); (long)rcu_seq_current(&rcu_state.gp_seq), totqlen);
rcu_check_gp_kthread_starvation(); rcu_check_gp_kthread_starvation();
@ -546,7 +546,7 @@ static void check_cpu_stall(struct rcu_data *rdp)
cmpxchg(&rcu_state.jiffies_stall, js, jn) == js) { cmpxchg(&rcu_state.jiffies_stall, js, jn) == js) {
/* We haven't checked in, so go dump stack. */ /* We haven't checked in, so go dump stack. */
print_cpu_stall(); print_cpu_stall(gps);
if (rcu_cpu_stall_ftrace_dump) if (rcu_cpu_stall_ftrace_dump)
rcu_ftrace_dump(DUMP_ALL); rcu_ftrace_dump(DUMP_ALL);
@ -555,7 +555,7 @@ static void check_cpu_stall(struct rcu_data *rdp)
cmpxchg(&rcu_state.jiffies_stall, js, jn) == js) { cmpxchg(&rcu_state.jiffies_stall, js, jn) == js) {
/* They had a few time units to dump stack, so complain. */ /* They had a few time units to dump stack, so complain. */
print_other_cpu_stall(gs2); print_other_cpu_stall(gs2, gps);
if (rcu_cpu_stall_ftrace_dump) if (rcu_cpu_stall_ftrace_dump)
rcu_ftrace_dump(DUMP_ALL); rcu_ftrace_dump(DUMP_ALL);
} }