Extending cpuset to include user processes

[Snoopy8]

A note for AK when CPUset capabilities are further enhanced.  Using Ubuntu 20.04, SnakeOil 1.2.9

With Upmpdcli, used the following to shift it
 

Code:

cset proc --move --toset=player --pid $(pgrep upmpdcli) --threads

The upmpdcli processes are successfully shifted to the player CPUset
 

Code:

$ cset proc -l -s player
cset: "player" cpuset of CPUSPEC(2) with 16 tasks running
USER       PID  PPID SPPr TASK NAME
-------- ----- ----- ---- ---------
upmpdcli  1139     1 Sr60 [upmpdcli]
upmpdcli  1141     1 Sr60 [upmpdcli]
upmpdcli  1145     1 Sr60 [upmpdcli]
upmpdcli  1149     1 Sr60 [upmpdcli]
upmpdcli  1150     1 Sr60 [MHD-listen]
upmpdcli  1151     1 Sr60 [MHD-listen]
upmpdcli  1153     1 Sr60 [upmpdcli]
upmpdcli  1597     1 Sr60 [upmpdcli]
upmpdcli  1599     1 Sr60 [upmpdcli]
upmpdcli  1689     1 Sr60 [upmpdcli]
upmpdcli  5595     1 Sr60 [upmpdcli]
upmpdcli  5638     1 Sr60 [upmpdcli]
upmpdcli  5797     1 Sr60 [upmpdcli]
upmpdcli  5798     1 Sr60 [upmpdcli]
upmpdcli  5840     1 Sr60 [upmpdcli]
upmpdcli  5843     1 Sr60 [MHD-connection]

Mpd have the following PIDs and should be in player CPUset (see above)
 

Code:

$ pgrep mpd
1139
1163

However, Top shows that Mpd can run in all the CPUs
 

Code:

PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND         P
     87 root     -86   0       0      0      0 S  10.0   0.0   2:18.91 irq/122-xhci_hc 1
   1163 root     -61   0  424452  23240  11960 S   6.0   0.1   1:29.56 mpd             3
   1139 upmpdcli -61   0 1749136  10220   7796 S   0.7   0.0   0:02.04 upmpdcli        2

Processor 2 is for Player CPUset and upmpdcli is correctly running in it.  But Mpd is appearing in processor 3 in this snapshot (and different processors in other snapshots).

Note that Mpd running on its own can be assigned to a CPUset.   It appears that the embedded Mpd process in upmpdcli cannot be locked into a CPUset. No idea why...