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delayacct: improve the average delay precision of getdelay tool to microsecond

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[ Upstream commit eca7de7cdc ]

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@zte.com.cn
Signed-off-by: Wang Yong <wang.yong12@zte.com.cn>
Reviewed-by: Yang Yang <yang.yang29@zte.com.cn>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: 3840cbe24c ("sched: psi: fix bogus pressure spikes from aggregation race")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wang Yong 2023-02-13 14:08:08 +08:00 committed by Greg Kroah-Hartman
parent 2760bafc1a
commit 6fddf325fa
3 changed files with 24 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Documentation/accounting/delay-accounting.rst
View File

@ -109,17 +109,17 @@ Get sum of delays, since system boot, for all pids with tgid 5::
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::

10
Documentation/translations/zh_CN/accounting/delay-accounting.rst
View File

@ -92,15 +92,15 @@ getdelays命令的一般格式::
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
WPCOPY count delay total delay average
0 0 0ms

24
tools/accounting/getdelays.c
View File

@ -198,17 +198,17 @@ static void print_delayacct(struct taskstats *t)
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 taskstats *t)
"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)