linux-kernel - [tip:tracing/ftrace] tracing: tracepoints for softirq entry/exit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tip-5d592b44b29a1d73e13d5c9e3426eed843bdc359@git.kernel.org>
Date:	Fri, 13 Mar 2009 04:02:57 GMT
From:	Jason Baron <jbaron@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	srostedt@...hat.com, jbaron@...hat.com, tglx@...utronix.de
Subject: [tip:tracing/ftrace] tracing: tracepoints for softirq entry/exit - add softirq-to-name array

Commit-ID:  5d592b44b29a1d73e13d5c9e3426eed843bdc359
Gitweb:     http://git.kernel.org/tip/5d592b44b29a1d73e13d5c9e3426eed843bdc359
Author:     Jason Baron <jbaron@...hat.com>
AuthorDate: Thu, 12 Mar 2009 14:33:36 -0400
Commit:     Steven Rostedt <srostedt@...hat.com>
CommitDate: Thu, 12 Mar 2009 21:15:02 -0400

tracing: tracepoints for softirq entry/exit - add softirq-to-name array

Create a 'softirq_to_name' array, which is indexed by softirq #, so
that we can easily convert between the softirq index # and its name, in
order to get more meaningful output messages.

LKML-Reference: <20090312183336.GB3352@...hat.com>
Signed-off-by: Jason Baron <jbaron@...hat.com>
Signed-off-by: Steven Rostedt <srostedt@...hat.com>


---
 include/linux/interrupt.h |    5 +++++
 kernel/softirq.c          |    9 ++++++++-
 2 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 472f117..9b7e9d7 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -258,6 +258,11 @@ enum
 	NR_SOFTIRQS
 };
 
+/* map softirq index to softirq name. update 'softirq_to_name' in
+ * kernel/softirq.c when adding a new softirq.
+ */
+extern char *softirq_to_name[NR_SOFTIRQS];
+
 /* softirq mask and active fields moved to irq_cpustat_t in
  * asm/hardirq.h to get better cache usage.  KAO
  */
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 7571bcb..9f90fdc 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -53,6 +53,12 @@ static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp
 
 static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
+char *softirq_to_name[NR_SOFTIRQS] = {
+	"HI_SOFTIRQ", "TIMER_SOFTIRQ", "NET_TX_SOFTIRQ", "NET_RX_SOFTIRQ",
+	"BLOCK_SOFTIRQ", "TASKLET_SOFTIRQ", "SCHED_SOFTIRQ", "HRTIMER_SOFTIRQ",
+	"RCU_SOFTIRQ"
+};
+
 /*
  * we cannot loop indefinitely here to avoid userspace starvation,
  * but we also don't want to introduce a worst case 1/HZ latency
@@ -209,9 +215,10 @@ restart:
 			h->action(h);
 
 			if (unlikely(prev_count != preempt_count())) {
-				printk(KERN_ERR "huh, entered softirq %td %p"
+				printk(KERN_ERR "huh, entered softirq %td %s %p"
 				       "with preempt_count %08x,"
 				       " exited with %08x?\n", h - softirq_vec,
+				       softirq_to_name[h - softirq_vec],
 				       h->action, prev_count, preempt_count());
 				preempt_count() = prev_count;
 			}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/