Loss of detail from kthreads
kris at FreeBSD.org
Tue Nov 13 16:46:42 PST 2007
Since the conversion from kprocs to kthreads there is a loss of
precision in how kernel process names are reported, because they now
mostly report the kproc name which is very generic.
e.g. if you only use top -S then you only have "idle", "intr" processes,
etc. You have to use top -SH, but then you also see the userland
threads, and there might be hundreds of them obscuring the kernel
threads. Also, ps now only displays the kproc:
root 12 100.0 0.0 0 136 ?? RL Sat01PM 6:28.30 [intr]
so you can't see which interrupt(s) are using CPU.
Finally, I noticed that DDB only displays the kproc name in e.g. allpcpu:
cpuid = 1
curthread = 0xcb41da50: pid 12 "intr"
curpcb = 0xe992cd90
fpcurthread = none
idlethread = 0xc67b7420: pid 11 "idle"
APIC ID = 1
currentldt = 0x50
Probably other things are also affected. All of these make kernel
analysis and debugging much less convenient, so this seems to me to be a
step backwards. Are you still working on fixing these issues?
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