[REGRESSION] [Linux 3.2] top/htop and all other CPU usage meteringapplications has gone crackers

[Artem S. Tashkinov]

Hello,

I'd like to report a weird regression in Linux 3.2 (running rc3 now) - all CPU metering applications have gone terribly mad
under this kernel:

Here are two text snapshots of htop:

  1  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Tasks: 135 total, 1 running
  2  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Load average: 0.00 0.01 0.05
  3  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Uptime: 00:27:49
  4  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Load: 0.00
  Mem[||||||||||||                                              544/8093MB]     Avg[||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]

 IORR  IOWR    IO   PID USER     PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+  Command
    0     0     0  3529 root      20   0 70052 52244 19324 S 300.  0.6  0:25.93 /usr/bin/X -br
    0     0     0  3678 user      20   0 33952 10220  8448 S 100.  0.1  0:03.58 gkrellm
    0     0     0  3772 user      20   0 32144 13960  9532 S 100.  0.2  0:07.46 konsole [kdeinit] --noxft
    0     0     0  6061 user      20   0  2780  1276   960 R 100.  0.0  0:00.01 htop
    0     0     0     1 root      20   0  2884  1376  1168 S  0.0  0.0  0:01.00 /sbin/init
    0     0     0     2 root      20   0     0     0     0 S  0.0  0.0  0:00.00 kthreadd


  1  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Tasks: 135 total, 1 running
  2  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Load average: 0.00 0.01 0.05
  3  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Uptime: 00:28:43
  4  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]     Load: 0.00
  Mem[||||||||||||                                              545/8093MB]     Avg[||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]

 IORR  IOWR    IO   PID USER     PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+  Command
    0     0     0  6061 user      20   0  2780  1288   972 R 57.0  0.0  0:00.11 htop
    0     0     0  5243 user      20   0  559M  318M 30928 S 57.0  3.9  0:26.07 /opt/firefox/firefox
    0     0     0  3687 user      20   0  108M 39124 23564 S 57.0  0.5  0:06.50 kedit
    0     0     0  3637 user      20   0 26960  5572  4288 S 57.0  0.1  0:00.02 klauncher [kdeinit] --new-startup
    0     0     0  3529 root      20   0 70052 52244 19324 S  0.0  0.6  0:26.71 /usr/bin/X -br

Interestingly with this madness going on, the internal kernel average load counter works properly:

[root@localhost ~]# uptime
 16:20:38 up 44 min,  2 users,  load average: 0.02, 0.04, 0.05

Right at this moment all process viewers report 400% CPU load (I have 4 CPU cores), either 400% loaded by user processes
or 200% by system and 200% by user processes.

Graphically it looks this way: http://img717.imageshack.us/img717/6495/top2b.png

I'm not running any CPU intensive applications at the moment at all.

My .config file can be downloaded here: http://ompldr.org/iYmZneg

My distro is Fedora 14 i686.

Best wishes,

Artem
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