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From: Waiman Long <longman@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org,
	Bart Van Assche <bvanassche@acm.org>,
	Waiman Long <longman@redhat.com>
Subject: [PATCH v2 6/6] locking/lockdep: Display irq_context names in /proc/lockdep_chains
Date: Mon, 16 Dec 2019 10:15:17 -0500	[thread overview]
Message-ID: <20191216151517.7060-7-longman@redhat.com> (raw)
In-Reply-To: <20191216151517.7060-1-longman@redhat.com>

Currently, the irq_context field of a lock chains displayed in
/proc/lockdep_chains is just a number. It is likely that many people
may not know what a non-zero number means. To make the information more
useful, print the actual irq names ("softirq" and "hardirq") instead.

Signed-off-by: Waiman Long <longman@redhat.com>
---
 kernel/locking/lockdep_proc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c
index 125c65e20bff..7f08bb4e7037 100644
--- a/kernel/locking/lockdep_proc.c
+++ b/kernel/locking/lockdep_proc.c
@@ -128,6 +128,13 @@ static int lc_show(struct seq_file *m, void *v)
 	struct lock_chain *chain = v;
 	struct lock_class *class;
 	int i;
+	static const char * const irq_strs[] = {
+		[0]			     = "0",
+		[LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq",
+		[LOCK_CHAIN_SOFTIRQ_CONTEXT] = "softirq",
+		[LOCK_CHAIN_SOFTIRQ_CONTEXT|
+		 LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq|softirq",
+	};
 
 	if (v == SEQ_START_TOKEN) {
 		if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
@@ -136,7 +143,7 @@ static int lc_show(struct seq_file *m, void *v)
 		return 0;
 	}
 
-	seq_printf(m, "irq_context: %d\n", chain->irq_context);
+	seq_printf(m, "irq_context: %s\n", irq_strs[chain->irq_context]);
 
 	for (i = 0; i < chain->depth; i++) {
 		class = lock_chain_get_class(chain, i);
-- 
2.18.1


  parent reply	other threads:[~2019-12-16 15:15 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-16 15:15 [PATCH v2 0/6] locking/lockdep: Reuse zapped chain_hlocks entries Waiman Long
2019-12-16 15:15 ` [PATCH v2 1/6] locking/lockdep: Track number of zapped classes Waiman Long
2020-01-13 14:55   ` Peter Zijlstra
2020-01-13 14:58     ` Waiman Long
2020-01-13 16:02       ` Bart Van Assche
2019-12-16 15:15 ` [PATCH v2 2/6] locking/lockdep: Throw away all lock chains with zapped class Waiman Long
2020-01-13 15:18   ` Peter Zijlstra
2020-01-13 15:44     ` Waiman Long
2020-01-13 16:05     ` Bart Van Assche
2020-01-13 16:15       ` Waiman Long
2019-12-16 15:15 ` [PATCH v2 3/6] locking/lockdep: Track number of zapped lock chains Waiman Long
2019-12-16 15:15 ` [PATCH v2 4/6] locking/lockdep: Reuse freed chain_hlocks entries Waiman Long
2020-01-13 15:51   ` Peter Zijlstra
2020-01-13 16:04     ` Waiman Long
2020-01-13 15:58   ` Peter Zijlstra
2020-01-13 16:24     ` Waiman Long
2020-01-14  9:46       ` Peter Zijlstra
2020-01-14 19:16         ` Waiman Long
2020-01-15 10:44           ` Peter Zijlstra
2020-01-15 19:26             ` Waiman Long
2020-01-13 15:59   ` Peter Zijlstra
2020-01-13 16:03     ` Waiman Long
2019-12-16 15:15 ` [PATCH v2 5/6] locking/lockdep: Decrement irq context counters when removing lock chain Waiman Long
2020-01-14  9:53   ` Peter Zijlstra
2020-01-14 15:04     ` Waiman Long
2019-12-16 15:15 ` Waiman Long [this message]
2020-01-06 15:54 ` [PATCH v2 0/6] locking/lockdep: Reuse zapped chain_hlocks entries Waiman Long
2020-01-06 16:50   ` Peter Zijlstra
2020-01-06 16:52     ` Waiman Long

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