Re: [Patch][RFC] Disabling per-tgid stats on task exit in taskstats

[Jay Lan]

Andrew Morton wrote:
> On Mon, 26 Jun 2006 14:00:45 -0400
> Shailabh Nagar <nagar@xxxxxxxxxxxxxx> wrote:
>
>
> > > Balbir, are you able to summarise where we stand wrt
> > > per-task-delay-accounting-* now?
> >
> > Andrew,
> >
> > I'm maintaining per-task delay accouting and taskstats interface patches 
> > so I'll take the liberty to reply :-)
>
>
> Sorry, too many IBMers ;)
>
>
> > > What problem have we identified?  How close are we to finding agreeable
> > > solutions to them?
> >
> > The main problems identified are:
> >
> > 1. extra sending of per-tgid stats on every thread exit
> > 2. unnecessary send of per-tgid stats when there are no listeners
> > 3. unnecessary linkage of delayacct accumalation into per-tgid stats 
> > with sending out of taskstats
> >
> > All three have an acceptable solution.
> > 1. & 3. are going to be addressed in a patch I'm sending out shortly.
> > 2. in a separate patch also being sent out shortly.
>
>
> Great.
>
>
> > > My general sense is that there's some rework needed, and that rework will
> > > affect the userspace interfaces, which is a problem for a 2.6.18 merge.
> >
> > The rework will affect the number of per-tgid records that userspace 
> > sees (fewer), not the format or any of the
> > other details regarding the genetlink interface.
> > Will that be a problem for userspace ?
>
>
> Nope.
>
> OK, please send the patch and I'll plan on sending this lot to Linus
> Thursdayish.

These new patches are fresh out of Shailabh's stove (well, i have
seen one, but not the other yet) and i have not had chance to look
at them yet. No need to rush, does it?

- jay

>

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