[RFC PATCH 0/3]perf/core: extend perf_reg and perf_sample_regs_intr
maddy at linux.vnet.ibm.com
Thu Nov 5 23:27:17 PST 2015
On Thursday 05 November 2015 06:37 PM, Peter Zijlstra wrote:
> On Thu, Nov 05, 2015 at 02:16:15AM +0530, Madhavan Srinivasan wrote:
>> Second patch updates struct arch_misc_reg for arch/powerpc with pmu registers
>> and adds offsetof macro for the same. It extends perf_reg_value()
>> to use reg idx to decide on struct to return value from.
> Why; what's in those regs?
Was out and did not have access to mail, so missed to respond in time.
In current implementation of patch 2, have added
few pmu control/status and counter registers,
which give additional information about the PMU context
for the sample.
These pmu registers are not relevant for ptrace and did not
want to overload pt_regs struct.
Adding these arch specific regs in perf_regs will break the "arch
neutral" part, and
other arch can also use this new struct in perf_regs to add more data
using perf_sample_regs_intr without extending the pt_regs.
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