Messages in this thread | | | Date | Thu, 8 Mar 2007 10:10:53 -0500 (EST) | From | Alan Stern <> | Subject | Re: [linux-usb-devel] khubd and ent:sda1 sucking CPU with reiser4 + USB HD |
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On Wed, 7 Mar 2007, Pete Zaitcev wrote:
> On Wed, 7 Mar 2007 17:18:29 -0500 (EST), Alan Stern <stern@rowland.harvard.edu> wrote: > > > I've never heard of a process failing to show up in a SysRq-t listing. It > > suggests something is wrong with the process management in the kernel you > > were using. That leads me to think a non -mm kernel might give more > > informative results. > > I think, if a process is looping, it's not shown in SysRq-t. So maybe > khubd is on a CPU.
You mean, if it is currently running? I don't believe that. A simple test comparison shows every process listed in "ps -A" also listed in SysRq-t.
> In RHEL we have a patch for SysRq-w, which showed all CPU states by > the way of a special IPI (unless looping with closed interrups, of course). > But this capability seems a bit degraded in stock SysRq-w. It might not > catch this (does not seem for me in 2.6.20). > > Another possibility is, something killed khubd. It's only a process > after all. Remember how we had grief with it being killed by "telinit 1".
If it was killed then it wouldn't show up in "ps" or as a directory under /proc.
Alan Stern
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