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library: tweak those system cpu statistics, <stat> api

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This patch may be a little misleading in terms of size
since most of the changes just reorder a little logic.
The most significant changes involve two GUEST values.

My original implementation excluded such tics from the
TOTAL calculation and, therefore, the BUSY figure too.

That decision was erroneously based on some code found
in ./kernel/sched/cputime.c which in hindsight applies
only to processes, not those system level cpu figures.

[ another likely oops classified STOLEN tics as IDLE ]

So, this patch attempts to bring those SUM values into
better agreement with the calculations performed for a
root cgroup (see ./kernel/cgroup/rstat.c source file).

[ we differ from those above in that we also include ]
[ the IDLE plus IOWAIT tics in our TOTAL calculation ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2020-09-08 00:00:00 -05:00
committed by Craig Small
parent bc55757231
commit ec21588be1
2 changed files with 44 additions and 45 deletions
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14
proc/stat.h
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@ -54,17 +54,17 @@ enum stat_item {
STAT_TIC_DELTA_GUEST, // sl_int "
STAT_TIC_DELTA_GUEST_NICE, // sl_int "
STAT_TIC_SUM_TOTAL, // ull_int derived from all except GUEST tics
STAT_TIC_SUM_IDLE, // ull_int derived from IDLE + IOWAIT + STOLEN tics
STAT_TIC_SUM_USER, // ull_int derived from USER + NICE tics
STAT_TIC_SUM_SYSTEM, // ull_int derived from SYSTEM + IRQ + SOFTIRQ tics
STAT_TIC_SUM_IDLE, // ull_int derived from IDLE + IOWAIT tics
STAT_TIC_SUM_BUSY, // ull_int derived from SUM_TOTAL - SUM_IDLE tics
STAT_TIC_SUM_SYSTEM, // ull_int derived from SUM_BUSY - SUM_USER tics
STAT_TIC_SUM_TOTAL, // ull_int derived from sum of all 10 tics
STAT_TIC_SUM_DELTA_TOTAL, // sl_int derived from above
STAT_TIC_SUM_DELTA_IDLE, // sl_int "
STAT_TIC_SUM_DELTA_USER, // sl_int "
STAT_TIC_SUM_DELTA_BUSY, // sl_int "
STAT_TIC_SUM_DELTA_USER, // sl_int derived from above
STAT_TIC_SUM_DELTA_SYSTEM, // sl_int "
STAT_TIC_SUM_DELTA_IDLE, // sl_int "
STAT_TIC_SUM_DELTA_BUSY, // sl_int "
STAT_TIC_SUM_DELTA_TOTAL, // sl_int "
STAT_SYS_CTX_SWITCHES, // ul_int /proc/stat
STAT_SYS_INTERRUPTS, // ul_int "