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Date: Thu, 5 Nov 2015 18:58:45 -0800 From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> To: Peter Zijlstra <peterz@...radead.org> Cc: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Stephane Eranian <eranian@...il.com>, Russell King <linux@....linux.org.uk>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Michael Ellerman <mpe@...erman.id.au> Subject: Re: [RFC PATCH 0/3]perf/core: extend perf_reg and perf_sample_regs_intr Peter Zijlstra [peterz@...radead.org] 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? Those are PMU control registers/counters (in Patch 2) that are of interest only in the context of a PMU interrupt and not relevant to ptrace itself. Could we add those registers to 'struct pt_regs' anyway? We do have 'struct perf_regs' but that seems to be arch nuetral. If architectures could override that, maybe we could add these new registers there without touching 'struct pt_regs'. Even so, lot of perf code depends on 'struct pt_regs'. Sukadev -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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