|| ||Paul Mackerras <firstname.lastname@example.org>|
|| ||[PATCH 0/9] Performance counters for POWER|
|| ||Fri, 9 Jan 2009 21:40:28 +1100|
|| ||Ingo Molnar <email@example.com>, Thomas Gleixner <firstname.lastname@example.org>|
|| ||Article, Thread
The following series of patches extends Ingo and Thomas's performance
counter framework to add support for 64-bit POWER processors.
Currently I have the PPC970 family and POWER6 done.
The approach I have taken is to do the constraint checking and the
search through the space of alternative event codes as each group of
counters is added at the time a task is scheduled in. That means we
are potentially doing the search several times in a row, with
interrupts disabled. I think it will be OK since there are only a few
events that have alternatives (and not many of them), and the
constraint checking is fast since it is just simple integer
operations. However, one of the things I plan to do is to instrument
that code to find out how long it takes in the worst case. (If it
takes too long then I will need some major changes to the generic
This series is also available via git at:
in the master branch.
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