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path: root/arch/s390/oprofile/hwsampler.h
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2011-05-10[S390] oprofile: fix min/max interval query checksMartin Schwidefsky
oprofile_min_interval and oprofile_max_interval are unsigned, checking for negative values doesn't work. Change hwsampler_query_min_interval and hwsampler_query_max_interval to return an unsigned long and check for a zero value instead. Reported-by: Nicolas Kaiser <nikai@nikai.net> Acked-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-02-15oprofile, s390: Add support for hardware based sampling on System z processorsHeinz Graalfs
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>