Message-ID: <5580DAFB.4080304@gmail.com>
Date: Tue, 16 Jun 2015 20:27:07 -0600
From: David Ahern <dsahern@gmail.com>
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To: Hemant Kumar <hemant@linux.vnet.ibm.com>, linuxppc-dev@lists.ozlabs.org
CC: linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, acme@kernel.org,
        mingo@kernel.org, sukadev@linux.vnet.ibm.com, maddy@linux.vnet.ibm.com,
        srikar@linux.vnet.ibm.com, paulus@samba.org, namhyung@kernel.org,
        jolsa@kernel.org, peterz@infradead.org
Subject: Re: [RFC PATCH] perf/kvm: Guest Symbol Resolution for powerpc
References: <1434423053-2173-1-git-send-email-hemant@linux.vnet.ibm.com> <55803883.50504@gmail.com> <5580CC69.2090200@linux.vnet.ibm.com>
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On 6/16/15 7:24 PM, Hemant Kumar wrote:
> Because, this depends on the kernel tracepoint "kvm_hv:kvm_guest_exit".
> perf_prepare_sample() in the kernel side sets the event->header.misc
> field to
> PERF_RECORD_MISC_KERNEL through perf_misc_flags(pt_regs). In case of
> tracepoints which always get hit in the host kernel context, the
> perf_misc_flags() will always return PERF_RECORD_MISC_KERNEL.
>
> IMHO we will rather have to set the cpumode in the user space for this
> tracepoint
> and we can't depend on the event->header.misc field for this case.
>
> What would you suggest?
>

oh, right you are using a tracepoint for this. It does not have the 
hooks to specify cpumode. Never mind.
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