Re: [RFC, PATCH 1/3] introduce SYS_CLONE_MASK
From: Eric W. Biederman
Date: Mon Apr 09 2007 - 12:23:26 EST
Roland McGrath <roland@xxxxxxxxxx> writes:
> I concur with Eric's assessment. Adding new magic bits to the generic
> clone path seems like a poor way to cope with kernel threads. I think
> it's better if kernel thread setup gets less like normal user process
> setup. I also agree with Eric that PPID of 0 is a very natural way for
> kernel threads to be displayed. We need to know more about the nature
> of the compatibility issue in procps to judge whether there is good
> reason to avoid changing it.
I just investigated the procps issue. Using init_task as the parent
nothing sticks out as being wrong in /proc.
Further when I modified pstree to accept 0 as it's starting pid (from
which all else would be rooted). All of the kernel threads showed up.
So if anything I it is a feature that kernel threads don't show up
by default in pstree (when PPID == 0). It isn't a subtle kernel bug.
Eric
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