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

Andrew Morton wrote:

On Mon, 26 Jun 2006 14:00:45 -0400
Shailabh Nagar <[email protected]> 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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