The patch titled
Subject: delayacct: improve the average delay precision of getdelay tool to microsecond
has been added to the -mm mm-nonmm-unstable branch. Its filename is
delayacct-improve-the-average-delay-precision-of-getdelay-tool-to-microsecond.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/delayacct-improve-the-average-delay-precision-of-getdelay-tool-to-microsecond.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wang Yong <wang.yong12@xxxxxxxxxx>
Subject: delayacct: improve the average delay precision of getdelay tool to microsecond
Date: Mon, 13 Feb 2023 14:08:08 +0800 (CST)
Improve the average delay precision of getdelay tool to microsecond. When
using the getdelay tool, it is sometimes found that the average delay
except CPU is not 0, but display is 0, because the precison is too low.
For example, see delay average of SWAP below when using ZRAM.
print delayacct stats ON
PID 32915
CPU count real total virtual total delay total delay average
339202 2793871936 9233585504 7951112 0.000ms
IO count delay total delay average
41 419296904 10ms
SWAP count delay total delay average
242589 1045792384 0ms
This wrong display is misleading, so improve the millisecond precision of
the average delay to microsecond just like CPU. Then user would get more
accurate information of delay time.
Link: https://lkml.kernel.org/r/202302131408087983857@xxxxxxxxxx
Signed-off-by: Wang Yong <wang.yong12@xxxxxxxxxx>
Reviewed-by: Yang Yang <yang.yang29@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/Documentation/accounting/delay-accounting.rst~delayacct-improve-the-average-delay-precision-of-getdelay-tool-to-microsecond
+++ a/Documentation/accounting/delay-accounting.rst
@@ -109,17 +109,17 @@ Get sum of delays, since system boot, fo
CPU count real total virtual total delay total delay average
8 7000000 6872122 3382277 0.423ms
IO count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
SWAP count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
RECLAIM count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
THRASHING count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
COMPACT count delay total delay average
- 0 0 0ms
- WPCOPY count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
+ WPCOPY count delay total delay average
+ 0 0 0.000ms
Get IO accounting for pid 1, it works only with -p::
--- a/Documentation/translations/zh_CN/accounting/delay-accounting.rst~delayacct-improve-the-average-delay-precision-of-getdelay-tool-to-microsecond
+++ a/Documentation/translations/zh_CN/accounting/delay-accounting.rst
@@ -91,15 +91,15 @@ è?·å??æ??æ??tgid为5ç??ä»»å?¡ä»?ç³»ç»?å?
CPU count real total virtual total delay total delay average
8 7000000 6872122 3382277 0.423ms
IO count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
SWAP count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
RECLAIM count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
THRASHING count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
COMPACT count delay total delay average
- 0 0 0ms
+ 0 0 0.000ms
è?·å??pid为1ç??IO计æ?°ï¼?å®?å?ªå??-pä¸?起使ç?¨::
# ./getdelays -i -p 1
--- a/tools/accounting/getdelays.c~delayacct-improve-the-average-delay-precision-of-getdelay-tool-to-microsecond
+++ a/tools/accounting/getdelays.c
@@ -198,17 +198,17 @@ static void print_delayacct(struct tasks
printf("\n\nCPU %15s%15s%15s%15s%15s\n"
" %15llu%15llu%15llu%15llu%15.3fms\n"
"IO %15s%15s%15s\n"
- " %15llu%15llu%15llums\n"
+ " %15llu%15llu%15.3fms\n"
"SWAP %15s%15s%15s\n"
- " %15llu%15llu%15llums\n"
+ " %15llu%15llu%15.3fms\n"
"RECLAIM %12s%15s%15s\n"
- " %15llu%15llu%15llums\n"
+ " %15llu%15llu%15.3fms\n"
"THRASHING%12s%15s%15s\n"
- " %15llu%15llu%15llums\n"
+ " %15llu%15llu%15.3fms\n"
"COMPACT %12s%15s%15s\n"
- " %15llu%15llu%15llums\n"
+ " %15llu%15llu%15.3fms\n"
"WPCOPY %12s%15s%15s\n"
- " %15llu%15llu%15llums\n",
+ " %15llu%15llu%15.3fms\n",
"count", "real total", "virtual total",
"delay total", "delay average",
(unsigned long long)t->cpu_count,
@@ -219,27 +219,27 @@ static void print_delayacct(struct tasks
"count", "delay total", "delay average",
(unsigned long long)t->blkio_count,
(unsigned long long)t->blkio_delay_total,
- average_ms(t->blkio_delay_total, t->blkio_count),
+ average_ms((double)t->blkio_delay_total, t->blkio_count),
"count", "delay total", "delay average",
(unsigned long long)t->swapin_count,
(unsigned long long)t->swapin_delay_total,
- average_ms(t->swapin_delay_total, t->swapin_count),
+ average_ms((double)t->swapin_delay_total, t->swapin_count),
"count", "delay total", "delay average",
(unsigned long long)t->freepages_count,
(unsigned long long)t->freepages_delay_total,
- average_ms(t->freepages_delay_total, t->freepages_count),
+ average_ms((double)t->freepages_delay_total, t->freepages_count),
"count", "delay total", "delay average",
(unsigned long long)t->thrashing_count,
(unsigned long long)t->thrashing_delay_total,
- average_ms(t->thrashing_delay_total, t->thrashing_count),
+ average_ms((double)t->thrashing_delay_total, t->thrashing_count),
"count", "delay total", "delay average",
(unsigned long long)t->compact_count,
(unsigned long long)t->compact_delay_total,
- average_ms(t->compact_delay_total, t->compact_count),
+ average_ms((double)t->compact_delay_total, t->compact_count),
"count", "delay total", "delay average",
(unsigned long long)t->wpcopy_count,
(unsigned long long)t->wpcopy_delay_total,
- average_ms(t->wpcopy_delay_total, t->wpcopy_count));
+ average_ms((double)t->wpcopy_delay_total, t->wpcopy_count));
}
static void task_context_switch_counts(struct taskstats *t)
_
Patches currently in -mm which might be from wang.yong12@xxxxxxxxxx are
delayacct-improve-the-average-delay-precision-of-getdelay-tool-to-microsecond.patch
