tree 591c941b9f12ce9f3caefd112f0ada3c5fcc53ab
parent 83895147b702434e6f236deeca75211fd0e3da3a
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1233833055 +0100
committer Ingo Molnar <mingo@elte.hu> 1233835473 +0100

signal: re-add dead task accumulation stats.

We're going to split the process wide cpu accounting into two parts:

 - clocks; which can take all the time they want since they run
           from user context.

 - timers; which need constant time tracing but can affort the overhead
           because they're default off -- and rare.

The clock readout will go back to a full sum of the thread group, for this
we need to re-add the exit stats that were removed in the initial itimer
rework (f06febc9: timers: fix itimer/many thread hang).

Furthermore, since that full sum can be rather slow for large thread groups
and we have the complete dead task stats, revert the do_notify_parent time
computation.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>