linux-kernel - Re: [Xen-devel] [PATCH v1 3/5] xen/PMU: Initialization code for Xen PMU

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Date:	Mon, 23 Sep 2013 10:25:15 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-kernel@...r.kernel.org, david.vrabel@...rix.com,
	JBeulich@...e.com, xen-devel@...ts.xen.org
Subject: Re: [Xen-devel] [PATCH v1 3/5] xen/PMU: Initialization code for Xen
 PMU

On 09/23/2013 10:18 AM, Boris Ostrovsky wrote:
> On 09/23/2013 09:26 AM, Konrad Rzeszutek Wilk wrote:
>> On Tue, Sep 10, 2013 at 11:31:48AM -0400, Boris Ostrovsky wrote:
>>> Map shared data structure that will hold CPU registers, VPMU context,
>>> VCPU/PCPI IDs of the VCPU interrupted by PMU interrupt. Hypervisor
>>> fills this information in its handler and passes it to the guest for
>>> further processing.
>>>
>>> Set up PMU VIRQ.
>>>
>>> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>>> ---
>>>   arch/x86/xen/Makefile          |   2 +-
>>>   arch/x86/xen/pmu.c             | 122 
>>> +++++++++++++++++++++++++++++++++++++++++
>>>   arch/x86/xen/pmu.h             |  12 ++++
>>>   arch/x86/xen/smp.c             |  31 ++++++++++-
>>>   include/xen/interface/xen.h    |   1 +
>>>   include/xen/interface/xenpmu.h |  77 ++++++++++++++++++++++++++
>>>   6 files changed, 243 insertions(+), 2 deletions(-)
>>>   create mode 100644 arch/x86/xen/pmu.c
>>>   create mode 100644 arch/x86/xen/pmu.h
>>>
>>> diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
>>> index 96ab2c0..b187df5 100644
>>> --- a/arch/x86/xen/Makefile
>>> +++ b/arch/x86/xen/Makefile
>>> @@ -13,7 +13,7 @@ CFLAGS_mmu.o            := $(nostackp)
>>>   obj-y        := enlighten.o setup.o multicalls.o mmu.o irq.o \
>>>               time.o xen-asm.o xen-asm_$(BITS).o \
>>>               grant-table.o suspend.o platform-pci-unplug.o \
>>> -            p2m.o
>>> +            p2m.o pmu.o
>> Perhaps guard the build of this based on CONFIG_PERF_EVENTS?
>>
>> That would of course mean you also have to create in xenpmu.h
>> static inline empy functions for xen_pmu_finish and xen_pmu_init in case
>> CONFIG_PERF_EVENTS is not set.
>
> This is interface header, am I allowed to do those sorts of things there?

Never mind that, I was thinking of a different file. Sorry.

>
> Also, *theoretically* other performance-measuring tools can use this 
> framework, expect for perf-specific things like callbacks and the 
> handler call. So maybe I should put CONFIG_PERF_EVENTS in pmu.c?
>

-boris

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