emo/procps
1
0
Fork 0
Code Issues Pull Requests Packages Releases Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

75
proc/stat.c
View File

@ -67,7 +67,7 @@
struct stat_jifs {
unsigned long long user, nice, system, idle, iowait, irq, sirq, stolen, guest, gnice;
unsigned long long xtot, xbsy, xidl, xusr, xsys;
unsigned long long xusr, xsys, xidl, xbsy, xtot;
};
struct stat_data {
@ -192,17 +192,17 @@ TICsetH(TIC_DELTA_STOLEN, sl_int, stolen)
TICsetH(TIC_DELTA_GUEST, sl_int, guest)
TICsetH(TIC_DELTA_GUEST_NICE, sl_int, gnice)
TIC_set(TIC_SUM_TOTAL, ull_int, xtot)
TIC_set(TIC_SUM_IDLE, ull_int, xidl)
TIC_set(TIC_SUM_USER, ull_int, xusr)
TIC_set(TIC_SUM_BUSY, ull_int, xbsy)
TIC_set(TIC_SUM_SYSTEM, ull_int, xsys)
TIC_set(TIC_SUM_IDLE, ull_int, xidl)
TIC_set(TIC_SUM_BUSY, ull_int, xbsy)
TIC_set(TIC_SUM_TOTAL, ull_int, xtot)
TICsetH(TIC_SUM_DELTA_TOTAL, sl_int, xtot)
TICsetH(TIC_SUM_DELTA_IDLE, sl_int, xidl)
TICsetH(TIC_SUM_DELTA_USER, sl_int, xusr)
TICsetH(TIC_SUM_DELTA_BUSY, sl_int, xbsy)
TICsetH(TIC_SUM_DELTA_SYSTEM, sl_int, xsys)
TICsetH(TIC_SUM_DELTA_IDLE, sl_int, xidl)
TICsetH(TIC_SUM_DELTA_BUSY, sl_int, xbsy)
TICsetH(TIC_SUM_DELTA_TOTAL, sl_int, xtot)
SYS_set(SYS_CTX_SWITCHES, ul_int, ctxt)
SYS_set(SYS_INTERRUPTS, ul_int, intr)
@ -329,17 +329,17 @@ static struct {
{ RS(TIC_DELTA_GUEST), QS(sl_int), TS(sl_int) },
{ RS(TIC_DELTA_GUEST_NICE), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_TOTAL), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_IDLE), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_USER), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_BUSY), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_SYSTEM), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_IDLE), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_BUSY), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_TOTAL), QS(ull_int), TS(ull_int) },
{ RS(TIC_SUM_DELTA_TOTAL), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_DELTA_IDLE), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_DELTA_USER), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_DELTA_BUSY), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_DELTA_SYSTEM), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_DELTA_IDLE), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_DELTA_BUSY), QS(sl_int), TS(sl_int) },
{ RS(TIC_SUM_DELTA_TOTAL), QS(sl_int), TS(sl_int) },
{ RS(SYS_CTX_SWITCHES), QS(ul_int), TS(ul_int) },
{ RS(SYS_INTERRUPTS), QS(ul_int), TS(ul_int) },
@ -392,34 +392,33 @@ static inline void stat_assign_results (
static inline void stat_derive_unique (
struct hist_tic *this)
{
/* note: we exclude guest tics from xtot since ...
'user' already includes 'guest'
'nice' already includes 'gnice'
( see: ./kernel/sched/cputime.c, account_guest_time ) */
this->new.xtot
/* note: we calculate these derived values in a manner consistent with
the calculations for cgroup accounting, as nearly as possible
( see linux sources: ./kernel/cgroup/rstat.c, root_cgroup_cputime ) */
this->new.xusr
= this->new.user
+ this->new.nice
+ this->new.system
+ this->new.idle
+ this->new.iowait
+ this->new.nice;
this->new.xsys
= this->new.system
+ this->new.irq
+ this->new.sirq
+ this->new.stolen;
this->new.xusr = this->new.user + this->new.nice;
/* this stolen guy is one i'm not sure of yet, but it's documented as:
"the time spent in other operating systems
when running in a virtualized environment"
so it would seem to apply to an 'involuntary wait' for a guest OS */
this->new.xidl = this->new.idle + this->new.iowait + this->new.stolen;
this->new.xbsy = this->new.xtot - this->new.xidl;
this->new.xsys = this->new.xbsy - this->new.xusr;
+ this->new.sirq;
this->new.xidl
= this->new.idle
+ this->new.iowait;
this->new.xtot
= this->new.xusr + this->new.xsys + this->new.xidl
+ this->new.stolen
+ this->new.guest
+ this->new.gnice;
this->new.xbsy
= this->new.xtot - this->new.xidl;
// don't distort deltas when cpus are taken offline or brought online
if (this->new.xtot < this->old.xtot
|| (this->new.xusr < this->old.xusr)
if (this->new.xusr < this->old.xusr
|| (this->new.xsys < this->old.xsys)
|| (this->new.xidl < this->old.xidl)
|| (this->new.xbsy < this->old.xbsy)
|| (this->new.xsys < this->old.xsys))
|| (this->new.xtot < this->old.xtot))
memcpy(&this->old, &this->new, sizeof(struct stat_jifs));
} // end: stat_derive_unique
@ -526,11 +525,11 @@ static int stat_make_numa_hist (
nod_ptr->new.guest += cpu_ptr->new.guest; nod_ptr->old.guest += cpu_ptr->old.guest;
nod_ptr->new.gnice += cpu_ptr->new.gnice; nod_ptr->old.gnice += cpu_ptr->old.gnice;
nod_ptr->new.xtot += cpu_ptr->new.xtot; nod_ptr->old.xtot += cpu_ptr->old.xtot;
nod_ptr->new.xbsy += cpu_ptr->new.xbsy; nod_ptr->old.xbsy += cpu_ptr->old.xbsy;
nod_ptr->new.xidl += cpu_ptr->new.xidl; nod_ptr->old.xidl += cpu_ptr->old.xidl;
nod_ptr->new.xusr += cpu_ptr->new.xusr; nod_ptr->old.xusr += cpu_ptr->old.xusr;
nod_ptr->new.xsys += cpu_ptr->new.xsys; nod_ptr->old.xsys += cpu_ptr->old.xsys;
nod_ptr->new.xidl += cpu_ptr->new.xidl; nod_ptr->old.xidl += cpu_ptr->old.xidl;
nod_ptr->new.xbsy += cpu_ptr->new.xbsy; nod_ptr->old.xbsy += cpu_ptr->old.xbsy;
nod_ptr->new.xtot += cpu_ptr->new.xtot; nod_ptr->old.xtot += cpu_ptr->old.xtot;
cpu_ptr->numa_node = nod_ptr->numa_node = node;
nod_ptr->count++; ;