Re: [PATCH 00/11] Task watchers: Introduction

[Matt Helsley <matthltc@us.ibm.com>]

On Mon, 2006-06-19 at 03:24 -0700, Andrew Morton wrote:
> On Tue, 13 Jun 2006 16:52:01 -0700
> Matt Helsley <matthltc@us.ibm.com> wrote:
> 
> > Task watchers is a notifier chain that sends notifications to registered
> > callers whenever a task forks, execs, changes its [re][ug]id, or exits.
> 
> Seems a reasonable objective - it'll certainly curtail (indeed, reverse)
> the ongoing proliferation of little subsystem-specific hooks all over the
> core code, will allow us to remove some #includes from core code and should
> permit some more things to be loaded as modules.
> 
> But I do wonder if it would have been better to have separate chains for
> each of WATCH_TASK_INIT, WATCH_TASK_EXEC, WATCH_TASK_UID, WATCH_TASK_GID,
> WATCH_TASK_EXIT.  That would reduce the number of elements which need to be
> traversed at each event and would eliminate the need for demultiplexing at
> each handler.

	It's a good idea, and should have the advantages you cited. My only
concern is that each task watcher would have to (un)register multiple
notifier blocks. I expect that in most cases there would only be two.
Also, if we apply this to per-task notifiers it would mean that we'd
have a 6 raw notifier heads per-task.

	Would you like me to redo the patches as multiple chains? Alternately,
I could produce patches that apply on top of the current set.

Cheers,
	-Matt Helsley

PS: I've already picked up your warning fix.