diff options
| author | Jeremy Kerr <jk@ozlabs.org> | 2009-03-11 17:55:52 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-03-24 13:47:28 +1100 |
| commit | fc59a3fc8eed3a2c811e64ec65015d7eb1459ace (patch) | |
| tree | b2ba8d071b92e85ba74ca59c402e0c63d4be1b95 /arch/powerpc/platforms/pseries/Kconfig | |
| parent | 098e8957afd86323db04cbb8deea3bd158f9cc71 (diff) | |
| download | linux-fc59a3fc8eed3a2c811e64ec65015d7eb1459ace.tar.bz2 | |
powerpc: Add virtual processor dispatch trace log
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>
Diffstat (limited to 'arch/powerpc/platforms/pseries/Kconfig')
| -rw-r--r-- | arch/powerpc/platforms/pseries/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index c0e6ec240f46..f0e6f28427bd 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -68,3 +68,13 @@ config CMM makes sense for a system running in an LPAR where the unused pages will be reused for other LPARs. The interface allows firmware to balance memory across many LPARs. + +config DTL + bool "Dispatch Trace Log" + depends on PPC_SPLPAR && DEBUG_FS + help + SPLPAR machines can log hypervisor preempt & dispatch events to a + kernel buffer. Saying Y here will enable logging these events, + which are accessible through a debugfs file. + + Say N if you are unsure. |