powerpc: Add virtual processor dispatch trace log

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pseries SPLPAR machines are able to retrieve a log of dispatch and
preempt events from the hypervisor. With this information, we can
see when and why each dispatch & preempt is occuring.

This change adds a set of debugfs files allowing userspace to read this
dispatch log.

Based on initial patches from Nishanth Aravamudan <nacc@us.ibm.com>.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Jeremy Kerr 2009-03-11 17:55:52 +00:00 • committed by Benjamin Herrenschmidt

parent 098e8957af

commit fc59a3fc8e

4 changed files with 295 additions and 0 deletions

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10

arch/powerpc/platforms/pseries/Kconfig

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1

arch/powerpc/platforms/pseries/Makefile

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274

arch/powerpc/platforms/pseries/dtl.c

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10

arch/powerpc/platforms/pseries/plpar_wrappers.h

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