Re: [PATCH v8 6/8] x86/resctrl: Move default group file creation to mount

[Reinette Chatre]

Hi Fenghua,

On 9/1/2023 4:21 PM, Fenghua Yu wrote:
> On 8/21/23 16:30, Babu Moger wrote:
>> The default resource group and its files are created during kernel
>> init time. Upcoming changes will make some resctrl files optional
>> based on a mount parameter. If optional files are to be added to the
>> default group based on the mount option, then each new file needs to
>> be created separately and call kernfs_activate() again.
>>
>> Create all files of the default resource group during resctrl
>> mount, destroyed during unmount, to avoid scattering resctrl
>> file addition across two separate code flows.
>>
>> Suggested-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
>> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
>> ---
>>   arch/x86/kernel/cpu/resctrl/internal.h |  2 +
>>   arch/x86/kernel/cpu/resctrl/rdtgroup.c | 55 +++++++++++++++-----------
>>   2 files changed, 33 insertions(+), 24 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
>> index b09e7abd1299..44ad98f8c7af 100644
>> --- a/arch/x86/kernel/cpu/resctrl/internal.h
>> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
>> @@ -611,5 +611,7 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
>>   void __init thread_throttle_mode_init(void);
>>   void __init mbm_config_rftype_init(const char *config);
>>   void rdt_staged_configs_clear(void);
>> +int rdtgroup_setup_root(struct rdt_fs_context *ctx);
>> +void rdtgroup_destroy_root(void);
> 
> These two functions are called only in rdtgroup.c. Why are they exposed here?
> 

Could you please take a look at the email thread [1] that
discusses this? We reached a compromise but would appreciate
if you have any guidance on the right solution.

Reinette

[1] https://lore.kernel.org/lkml/972db626-1d74-679d-72f2-3e122f95c314@xxxxxxxxx/