From: "Paul E. McKenney" <paulmck@kernel.org>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
rostedt@goodmis.org, "Paul E. McKenney" <paulmck@kernel.org>
Subject: [PATCH rcu 07/19] srcu: Make rcutorture dump the SRCU size state
Date: Fri, 4 Feb 2022 15:38:50 -0800 [thread overview]
Message-ID: <20220204233902.1902-7-paulmck@kernel.org> (raw)
In-Reply-To: <20220204233858.GA1469@paulmck-ThinkPad-P17-Gen-1>
This commit adds the numeric and string version of ->srcu_size_state to
the Tree-SRCU-specific portion of the rcutorture output.
[ paulmck: Apply feedback from kernel test robot and Dan Carpenter. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/srcutree.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index fce041b648ee3..550991cc213d3 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -1400,15 +1400,34 @@ void srcutorture_get_gp_data(enum rcutorture_type test_type,
}
EXPORT_SYMBOL_GPL(srcutorture_get_gp_data);
+const char * const srcu_size_state_name[] =
+{
+ "SRCU_SIZE_SMALL",
+ "SRCU_SIZE_ALLOC",
+ "SRCU_SIZE_WAIT_BARRIER",
+ "SRCU_SIZE_WAIT_CALL",
+ "SRCU_SIZE_WAIT_CBS1",
+ "SRCU_SIZE_WAIT_CBS2",
+ "SRCU_SIZE_WAIT_CBS3",
+ "SRCU_SIZE_WAIT_CBS4",
+ "SRCU_SIZE_BIG",
+ "SRCU_SIZE_???",
+};
+
void srcu_torture_stats_print(struct srcu_struct *ssp, char *tt, char *tf)
{
int cpu;
int idx;
unsigned long s0 = 0, s1 = 0;
+ int ss_state = READ_ONCE(ssp->srcu_size_state);
+ int ss_state_idx = ss_state;
idx = ssp->srcu_idx & 0x1;
- pr_alert("%s%s Tree SRCU g%ld per-CPU(idx=%d):",
- tt, tf, rcu_seq_current(&ssp->srcu_gp_seq), idx);
+ if (ss_state < 0 || ss_state >= ARRAY_SIZE(srcu_size_state_name))
+ ss_state_idx = ARRAY_SIZE(srcu_size_state_name) - 1;
+ pr_alert("%s%s Tree SRCU g%ld state %d (%s) per-CPU(idx=%d):",
+ tt, tf, rcu_seq_current(&ssp->srcu_gp_seq), ss_state,
+ srcu_size_state_name[ss_state_idx], idx);
for_each_possible_cpu(cpu) {
unsigned long l0, l1;
unsigned long u0, u1;
--
2.31.1.189.g2e36527f23
next prev parent reply other threads:[~2022-02-04 23:39 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-04 23:38 [PATCH rcu 0/19] SRCU updates for v5.18 Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 01/19] srcu: Tighten cleanup_srcu_struct() GP checks Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 02/19] srcu: Fix s/is/if/ typo in srcu_node comment Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 03/19] srcu: Make srcu_funnel_gp_start() cache ->mynode in snp_leaf Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 04/19] srcu: Dynamically allocate srcu_node array Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 05/19] srcu: Make Tree SRCU able to operate without snp_node array Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 06/19] srcu: Add size-state transitioning code Paul E. McKenney
2022-02-04 23:38 ` Paul E. McKenney [this message]
2022-02-04 23:38 ` [PATCH rcu 08/19] srcu: Add boot-time control over srcu_node array allocation Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 09/19] srcu: Use export for srcu_struct defined by DEFINE_STATIC_SRCU() Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 10/19] srcu: Compute snp_seq earlier in srcu_funnel_gp_start() Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 11/19] srcu: Use invalid initial value for srcu_node GP sequence numbers Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 12/19] srcu: Avoid NULL dereference in srcu_torture_stats_print() Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 13/19] srcu: Prevent cleanup_srcu_struct() from freeing non-dynamic ->sda Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 14/19] srcu: Explain srcu_funnel_gp_start() call to list_add() is safe Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 15/19] srcu: Create concurrency-safe helper for initiating size transition Paul E. McKenney
2022-02-04 23:38 ` [PATCH rcu 16/19] srcu: Add contention-triggered addition of srcu_node tree Paul E. McKenney
2022-02-04 23:39 ` [PATCH rcu 17/19] srcu: Make srcu_size_state_name static Paul E. McKenney
2022-02-04 23:39 ` [PATCH rcu 18/19] srcu: Automatically determine size-transition strategy at boot Paul E. McKenney
2022-02-04 23:39 ` [PATCH rcu 19/19] srcu: Add contention check to call_srcu() srcu_data ->lock acquisition Paul E. McKenney
[not found] ` <20220205030303.2408-1-hdanton@sina.com>
2022-02-05 5:20 ` Paul E. McKenney
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