Re: [patch] O(1) sys_exit(), threading, scalable-exit-2.5.31-A6

From: Dave McCracken (
Date: Mon Aug 19 2002 - 13:51:42 EST

--On Monday, August 19, 2002 08:36:24 PM +0200 Ingo Molnar <>

> well, this means that we'd still have to iterate through both lists in
> wait4(), and we'd have to maintain the ptrace list(s) in all the relevant
> codepaths - does this buy us anything relative to -B4?

The lists would constitute the tasks that wait4() should consider, at
least. And maintaining the list wouldn't be any more work than the
current reparenting. I do admit that I don't see a significant win,
codewise, other than aesthetics.

In looking at the code I was wondering something. What happens to the real
parent of a ptraced task when it calls wait4()? If that's its only child,
won't it return ECHILD?

Dave McCracken

Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059 T/L 678-3059

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