lkml.org 
[lkml]   [2020]   [Aug]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[RFC PATCH 4/7] core/metricfs: expose softirq information through metricfs
From
Add metricfs support for displaying percpu softirq counters.  The
top directory is /sys/kernel/debug/metricfs/softirq. Then there
is a subdirectory for each softirq type. For example:

cat /sys/kernel/debug/metricfs/softirq/NET_RX/values

Signed-off-by: Jonathan Adams <jwadams@google.com>

---

jwadams@google.com: rebased to 5.8-pre6
This is work originally done by another engineer at
google, who would rather not have their name associated with this
patchset. They're okay with me sending it under my name.
---
kernel/softirq.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index c4201b7f42b1..1ae3a540b789 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -25,6 +25,8 @@
#include <linux/smpboot.h>
#include <linux/tick.h>
#include <linux/irq.h>
+#include <linux/jump_label.h>
+#include <linux/metricfs.h>

#define CREATE_TRACE_POINTS
#include <trace/events/irq.h>
@@ -738,3 +740,46 @@ unsigned int __weak arch_dynirq_lower_bound(unsigned int from)
{
return from;
}
+
+#ifdef CONFIG_METRICFS
+
+#define METRICFS_ITEM(name) \
+static void \
+metricfs_##name(struct metric_emitter *e, int cpu) \
+{ \
+ int64_t v = kstat_softirqs_cpu(name##_SOFTIRQ, cpu); \
+ METRIC_EMIT_PERCPU_INT(e, cpu, v); \
+} \
+METRIC_EXPORT_PERCPU_COUNTER(name, #name " softirq", metricfs_##name)
+
+METRICFS_ITEM(HI);
+METRICFS_ITEM(TIMER);
+METRICFS_ITEM(NET_TX);
+METRICFS_ITEM(NET_RX);
+METRICFS_ITEM(BLOCK);
+METRICFS_ITEM(IRQ_POLL);
+METRICFS_ITEM(TASKLET);
+METRICFS_ITEM(SCHED);
+METRICFS_ITEM(HRTIMER);
+METRICFS_ITEM(RCU);
+
+static int __init init_softirq_metricfs(void)
+{
+ struct metricfs_subsys *subsys;
+
+ subsys = metricfs_create_subsys("softirq", NULL);
+ metric_init_HI(subsys);
+ metric_init_TIMER(subsys);
+ metric_init_NET_TX(subsys);
+ metric_init_NET_RX(subsys);
+ metric_init_BLOCK(subsys);
+ metric_init_IRQ_POLL(subsys);
+ metric_init_TASKLET(subsys);
+ metric_init_SCHED(subsys);
+ metric_init_RCU(subsys);
+
+ return 0;
+}
+module_init(init_softirq_metricfs);
+
+#endif
--
2.28.0.236.gb10cc79966-goog
\
 
 \ /
  Last update: 2020-08-06 02:16    [W:0.087 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site