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From: David Ahern <dsahern@gmail.com>
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
Date: Wed, 17 Jun 2015 02:27:07 +0000	[thread overview]
Message-ID: <5580DAFB.4080304@gmail.com> (raw)
In-Reply-To: <5580CC69.2090200@linux.vnet.ibm.com>

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.

WARNING: multiple messages have this Message-ID (diff)
From: David Ahern <dsahern@gmail.com>
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
Date: Tue, 16 Jun 2015 20:27:07 -0600	[thread overview]
Message-ID: <5580DAFB.4080304@gmail.com> (raw)
In-Reply-To: <5580CC69.2090200@linux.vnet.ibm.com>

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.

  reply	other threads:[~2015-06-17  2:27 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-16  2:50 [RFC PATCH] perf/kvm: Guest Symbol Resolution for powerpc Hemant Kumar
2015-06-16  2:52 ` Hemant Kumar
2015-06-16 14:53 ` David Ahern
2015-06-16 14:53   ` David Ahern
2015-06-17  1:24   ` Hemant Kumar
2015-06-17  1:36     ` Hemant Kumar
2015-06-17  2:27     ` David Ahern [this message]
2015-06-17  2:27       ` David Ahern
2015-06-16 15:38 ` Arnaldo Carvalho de Melo
2015-06-16 15:38   ` Arnaldo Carvalho de Melo
2015-06-18  0:03   ` Hemant Kumar
2015-06-18  0:15     ` Hemant Kumar

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