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Re: [PATCH v1 06/19] xen/sysctl: wrap around XEN_SYSCTL_perfc_op
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 13 Mar 2025 09:23:54 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, ray.huang@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>
- Delivery-date: Thu, 13 Mar 2025 08:23:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.03.2025 00:12, Stefano Stabellini wrote:
> On Wed, 12 Mar 2025, Penny Zheng wrote:
>> perfc_control() and perfc_copy_info() are responsible for providing control
>> of perf counters via XEN_SYSCTL_perfc_op in DOM0, so they both shall
>> be wrapped.
>>
>> Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
>> ---
>> xen/common/perfc.c | 2 ++
>> xen/include/xen/perfc.h | 8 ++++++++
>> 2 files changed, 10 insertions(+)
>>
>> diff --git a/xen/common/perfc.c b/xen/common/perfc.c
>> index 8302b7cf6d..0f3b89af2c 100644
>> --- a/xen/common/perfc.c
>> +++ b/xen/common/perfc.c
>> @@ -149,6 +149,7 @@ void cf_check perfc_reset(unsigned char key)
>> }
>> }
>>
>> +#ifdef CONFIG_SYSCTL
>
> I think in this case it would be best to make CONFIG_PERF_COUNTERS
> depending on CONFIG_SYSCTL. The consequence is that without
> CONFIG_SYSCTL, xen/common/perfc.c will be disabled in the build.
But perf counters can be used without sysctl, via the dedicated debug
keys.
Jan
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