Shailabh,
Is this patch supposed to go on top of all other patches? Or is it
supposed to replace any? I had failure applying this patch on top
of all previously applied.
- jay
Shailabh Nagar wrote:
Send per-tgid data only once during exit of a thread group instead of once with
each member thread exit.
Currently, when a thread exits, besides its per-tid data, the per-tgid data of
its thread group is also sent out, if its thread group is non-empty. The
per-tgid data sent consists of the sum of per-tid stats for all *remaining*
threads of the thread group.
This patch modifies this sending in two ways:
- the per-tgid data is sent only when the last thread of a thread group exits.
This cuts down heavily on the overhead of sending/receiving per-tgid data,
especially when other exploiters of the taskstats interface aren't interested
in per-tgid stats
- the semantics of the per-tgid data sent are changed. Instead of being the
sum of per-tid data for remaining threads, the value now sent is the true total
accumalated statistics for all threads that are/were part of the thread group.
The patch also addresses a minor issue where failure of one accounting
subsystem to fill in the taskstats structure was causing the send of taskstats
to not be sent at all.
The patch has been tested for stability and run cerberus for over 4 hours on
an SMP.
Signed-off-by: Shailabh Nagar <[email protected]>
Signed-off-by: Balbir Singh <[email protected]>
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