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Message-ID: <20240402112922.GA18945@didi-ThinkCentre-M930t-N000>
Date: Tue, 2 Apr 2024 19:29:22 +0800
From: Tio Zhang <tiozhang@...iglobal.com>
To: <mingo@...hat.com>, <peterz@...radead.org>, <juri.lelli@...hat.com>,
<vincent.guittot@...aro.org>, <rostedt@...dmis.org>, <bsingharora@...il.com>,
<corbet@....net>, <akpm@...ux-foundation.org>
CC: <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<dietmar.eggemann@....com>, <bsegall@...gle.com>, <mgorman@...e.de>,
<bristot@...hat.com>, <vschneid@...hat.com>, <tiozhang@...iglobal.com>,
<zyhtheonly@...il.com>, <zyhtheonly@...h.net>, <fuyuanli@...iglobal.com>
Subject: [PATCH 3/3] delayacct/taskstats: make soft_delay available in
taskstats
Also update a new version of tools/accounting/getdelays.c.
# ./getdelays -t 4600 -d
print delayacct stats ON
TGID 4600
CPU count real total virtual total delay total delay average
3973 10700014780 10698803222 312345815813 78.617ms
IO count delay total delay average
0 0 0.000ms
SWAP count delay total delay average
0 0 0.000ms
RECLAIM count delay total delay average
0 0 0.000ms
THRASHING count delay total delay average
0 0 0.000ms
COMPACT count delay total delay average
0 0 0.000ms
WPCOPY count delay total delay average
40 266859 0.007ms
IRQ count delay total delay average
13450 17756373906 1.320ms
SOFTIRQ count delay total delay average
Signed-off-by: Tio Zhang <tiozhang@...iglobal.com>
---
Documentation/accounting/delay-accounting.rst | 5 ++++-
include/uapi/linux/taskstats.h | 6 +++++-
kernel/delayacct.c | 3 +++
tools/accounting/getdelays.c | 8 +++++++-
4 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/Documentation/accounting/delay-accounting.rst b/Documentation/accounting/delay-accounting.rst
index f61c01fc376e..babff410a39d 100644
--- a/Documentation/accounting/delay-accounting.rst
+++ b/Documentation/accounting/delay-accounting.rst
@@ -17,6 +17,7 @@ e) thrashing
f) direct compact
g) write-protect copy
h) IRQ/SOFTIRQ
+i) SOFTIRQ
and makes these statistics available to userspace through
the taskstats interface.
@@ -50,7 +51,7 @@ this structure. See
for a description of the fields pertaining to delay accounting.
It will generally be in the form of counters returning the cumulative
delay seen for cpu, sync block I/O, swapin, memory reclaim, thrash page
-cache, direct compact, write-protect copy, IRQ/SOFTIRQ etc.
+cache, direct compact, write-protect copy, IRQ/SOFTIRQ, SOFTIRQ etc.
Taking the difference of two successive readings of a given
counter (say cpu_delay_total) for a task will give the delay
@@ -123,6 +124,8 @@ Get sum of delays, since system boot, for all pids with tgid 5::
0 0 0.000ms
IRQ count delay total delay average
0 0 0.000ms
+ SOFTIRQ count delay total delay average
+ 0 0 0.000ms
Get IO accounting for pid 1, it works only with -p::
diff --git a/include/uapi/linux/taskstats.h b/include/uapi/linux/taskstats.h
index b50b2eb257a0..5412c4d6734d 100644
--- a/include/uapi/linux/taskstats.h
+++ b/include/uapi/linux/taskstats.h
@@ -34,7 +34,7 @@
*/
-#define TASKSTATS_VERSION 14
+#define TASKSTATS_VERSION 15
#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
* in linux/sched.h */
@@ -202,6 +202,10 @@ struct taskstats {
/* v14: Delay waiting for IRQ/SOFTIRQ */
__u64 irq_count;
__u64 irq_delay_total;
+
+ /* v15: Delay waiting for SOFTIRQ */
+ __u64 soft_count;
+ __u64 soft_delay_total;
};
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 8517f1c1df88..39d9430d723f 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -181,6 +181,8 @@ int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
d->wpcopy_delay_total = (tmp < d->wpcopy_delay_total) ? 0 : tmp;
tmp = d->irq_delay_total + tsk->delays->irq_delay;
d->irq_delay_total = (tmp < d->irq_delay_total) ? 0 : tmp;
+ tmp = d->soft_delay_total + tsk->delays->soft_delay;
+ d->soft_delay_total = (tmp < d->soft_delay_total) ? 0 : tmp;
d->blkio_count += tsk->delays->blkio_count;
d->swapin_count += tsk->delays->swapin_count;
d->freepages_count += tsk->delays->freepages_count;
@@ -188,6 +190,7 @@ int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
d->compact_count += tsk->delays->compact_count;
d->wpcopy_count += tsk->delays->wpcopy_count;
d->irq_count += tsk->delays->irq_count;
+ d->soft_count += tsk->delays->soft_count;
raw_spin_unlock_irqrestore(&tsk->delays->lock, flags);
return 0;
diff --git a/tools/accounting/getdelays.c b/tools/accounting/getdelays.c
index 1334214546d7..6e4e032e93c4 100644
--- a/tools/accounting/getdelays.c
+++ b/tools/accounting/getdelays.c
@@ -210,6 +210,8 @@ static void print_delayacct(struct taskstats *t)
"WPCOPY %12s%15s%15s\n"
" %15llu%15llu%15.3fms\n"
"IRQ %15s%15s%15s\n"
+ " %15llu%15llu%15.3fms\n"
+ "SOFTIRQ %12s%15s%15s\n"
" %15llu%15llu%15.3fms\n",
"count", "real total", "virtual total",
"delay total", "delay average",
@@ -245,7 +247,11 @@ static void print_delayacct(struct taskstats *t)
"count", "delay total", "delay average",
(unsigned long long)t->irq_count,
(unsigned long long)t->irq_delay_total,
- average_ms((double)t->irq_delay_total, t->irq_count));
+ average_ms((double)t->irq_delay_total, t->irq_count),
+ "count", "delay total", "delay average",
+ (unsigned long long)t->soft_count,
+ (unsigned long long)t->soft_delay_total,
+ average_ms((double)t->soft_delay_total, t->soft_count));
}
static void task_context_switch_counts(struct taskstats *t)
--
2.17.1
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