path: root/arch/s390/oprofile/init.c
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authorHeinz Graalfs <graalfs@linux.vnet.ibm.com>2011-01-21 10:06:52 +0000
committerRobert Richter <robert.richter@amd.com>2011-02-15 11:08:19 +0100
commitec6a3df1c008d9e8664e53b0363f6847c5c0dc3f (patch)
tree29026a43fe081f6fb28a2417f582038b89056376 /arch/s390/oprofile/init.c
parent54ebbe7ba51d97a28a9a406203d171d61858e4b9 (diff)
oprofile, s390: Add support for hardware based sampling on System z processors
This adds support for hardware based sampling on System z processors (models z10 and up). System z's hardware sampling is described in detail in: SA23-2260-01 "The Load-Program-Parameter and CPU-Measurement Facilities" The patch introduces - support for System z's hardware sampler in OProfile's kernel module - it adds functions that control all hardware sampling related operations as: - checking if hardware sampling feature is available, i.e.: on System z models z10 and up, in LPAR mode only, and authorised during LPAR activation - allocating memory for the hardware sampling feature - starting/stopping hardware sampling All functions required to start and stop hardware sampling have to be invoked by the oprofile kernel module as provided by the other patches of this patch set. In case hardware based sampling cannot be setup standard timer based sampling is used by OProfile. Applied with following changes: * enable compilation in Makefile Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Maran Pakkirisamy <maranp@linux.vnet.ibm.com> Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'arch/s390/oprofile/init.c')
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