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

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Date:   Wed, 30 Aug 2023 13:00:46 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     <babu.moger@....com>, <corbet@....net>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <bp@...en8.de>
CC:     <fenghua.yu@...el.com>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
        <akpm@...ux-foundation.org>, <quic_neeraju@...cinc.com>,
        <rdunlap@...radead.org>, <damien.lemoal@...nsource.wdc.com>,
        <songmuchun@...edance.com>, <peterz@...radead.org>,
        <jpoimboe@...nel.org>, <pbonzini@...hat.com>,
        <chang.seok.bae@...el.com>, <pawan.kumar.gupta@...ux.intel.com>,
        <jmattson@...gle.com>, <daniel.sneddon@...ux.intel.com>,
        <sandipan.das@....com>, <tony.luck@...el.com>,
        <james.morse@....com>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bagasdotme@...il.com>,
        <eranian@...gle.com>, <christophe.leroy@...roup.eu>,
        <jarkko@...nel.org>, <adrian.hunter@...el.com>,
        <quic_jiles@...cinc.com>, <peternewman@...gle.com>
Subject: Re: [PATCH v8 6/8] x86/resctrl: Move default group file creation to
 mount

Hi Babu,

On 8/30/2023 12:50 PM, Moger, Babu wrote:
> Hi Reinette,
> 
> On 8/29/23 15:11, Reinette Chatre wrote:
>> Hi Babu,
>>
>> On 8/21/2023 4:30 PM, 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@...el.com>
>>> Signed-off-by: Babu Moger <babu.moger@....com>
>>> ---
>>>  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);
>>>  
>>
>> From what I can tell these functions are only used in rdtgroup.c.
>> Can this export be avoided by just moving these functions within
>> rdtgroup.c and making them static?
> 
> Yes. It is used only in rdtgroup.c. We can make this static by adding the
> prototypes of these function in the beginning of rdtgroup.c file to avoid
> implicit declaration compiler errors.

Why not just place the functions earlier in rdtgroup.c so that they are
located before all callers? 

Reinette