Messages in this thread |  | | Date | Mon, 19 Aug 2002 13:31:38 -0500 | From | Dave McCracken <> | Subject | Re: [patch] O(1) sys_exit(), threading, scalable-exit-2.5.31-A6 |
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--On Monday, August 19, 2002 08:08:10 PM +0200 Ingo Molnar <mingo@elte.hu> wrote:
> the problem is that the tracing task wants to do a wait4() on all traced > children, and the only way to get that is to have the traced tasks in the > child list. Eg. strace -f traces a random number of tasks, and after the > PTRACE_CONTINUE call, the wait4 done by strace must be able to 'get > events' from pretty much any of the traced tasks. So unless the ptrace > interface is reworked in an incompatible way, i cannot see how this would > work. wait4 could perhaps somehow search the whole tasklist, but that > could be a pretty big pain even for something like strace.
It seems to me it would be worth adding list_heads in the task struct for ptraced tasks and ptraced siblings if it gets rid of the reparenting.
Dave McCracken
====================================================================== Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059 dmccr@us.ibm.com T/L 678-3059
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