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SubjectRe: uninterruptible sleep lockups
Denis Vlasenko wrote:
>>>The infrastructure for that does not exist, so instead, the "killed"
>>>process remains. Not all of it, but at least the memory pinned down by
>>>the io request. This overhead is typically small, and the overehad of
>>>adding forced io abort to every driver might
>>>be larger than a handful of stuck processes. It looks ugly, but perhaps
>>>a ps flag that hides the ugly processes is enough.
>>
>>I don't care about any overhead associated with stuck processes, nor do I
>>care that they look ugly in the ps output. What I care about is the fact
>>that at least once a week on multiple systems with different hardware, some
>>HW-related driver/process gets stuck, then immediately cascades its
>>stuckness up to udevd or hald, and then I can't use any of my hardware
>>anymore until I reboot.
>
>
> This was discussed to death before. There will never be a "D-state" killer. Period.
>
> If you want to get rid of your stuck processes, you need to fix the bug
> or at least let lkml people know about it (this was already explained to you!).

I didn't mention any of that here; my reply was simply to correct Helge's
misunderstanding about why I dislike stuck processes. Regardless of whether
the bugs get fixed or the kernel finds a way to work around them, my dislike
has nothing to do with the overhead or "ugliness" of stuck processes; I
dislike them because they render my system useless for 75% of the things I
use it for.

-Anthony DiSante
http://nodivisions.com/
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