linux-kernel - Re: [RFC PATCH] perf/kvm: Guest Symbol Resolution for powerpc

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Message-ID: <5580DAFB.4080304@gmail.com>
Date:	Tue, 16 Jun 2015 20:27:07 -0600
From:	David Ahern <dsahern@...il.com>
To:	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org
CC:	linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
	acme@...nel.org, mingo@...nel.org, sukadev@...ux.vnet.ibm.com,
	maddy@...ux.vnet.ibm.com, srikar@...ux.vnet.ibm.com,
	paulus@...ba.org, namhyung@...nel.org, jolsa@...nel.org,
	peterz@...radead.org
Subject: Re: [RFC PATCH] perf/kvm: Guest Symbol Resolution for powerpc

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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