[v2] x86/resctrl: Miscellaneous resctrl features

[RFC v2 PATCH 5/7] x86/resctrl: Introduce -o debug mount option

Posted by Babu Moger 2 years, 7 months ago

Add -o debug option to mount resctrl filesystem in debug mode. Debug
option adds the files for debug purposes.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 Documentation/x86/resctrl.rst          |    2 ++
 arch/x86/kernel/cpu/resctrl/internal.h |    1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |    7 +++++++
 3 files changed, 10 insertions(+)

diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
index 58b76fc75cb7..2c013c5d45fd 100644
--- a/Documentation/x86/resctrl.rst
+++ b/Documentation/x86/resctrl.rst
@@ -46,6 +46,8 @@ mount options are:
 "mba_MBps":
 	Enable the MBA Software Controller(mba_sc) to specify MBA
 	bandwidth in MBps
+"debug":
+	Lists the debug files in resctrl interface
 
 L2 and L3 CDP are controlled separately.
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 6767c85b9699..35a9ee343fe0 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -59,6 +59,7 @@ struct rdt_fs_context {
 	bool				enable_cdpl2;
 	bool				enable_cdpl3;
 	bool				enable_mba_mbps;
+	bool				debug;
 };
 
 static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 18d458a3cba6..9b7813aa6baf 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2555,6 +2555,7 @@ enum rdt_param {
 	Opt_cdp,
 	Opt_cdpl2,
 	Opt_mba_mbps,
+	Opt_debug,
 	nr__rdt_params
 };
 
@@ -2562,6 +2563,7 @@ static const struct fs_parameter_spec rdt_fs_parameters[] = {
 	fsparam_flag("cdp",		Opt_cdp),
 	fsparam_flag("cdpl2",		Opt_cdpl2),
 	fsparam_flag("mba_MBps",	Opt_mba_mbps),
+	fsparam_flag("debug",		Opt_debug),
 	{}
 };
 
@@ -2587,6 +2589,9 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
 			return -EINVAL;
 		ctx->enable_mba_mbps = true;
 		return 0;
+	case Opt_debug:
+		ctx->debug = true;
+		return 0;
 	}
 
 	return -EINVAL;
@@ -3525,6 +3530,8 @@ static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
 	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
 		seq_puts(seq, ",mba_MBps");
 
+	seq_puts(seq, ",debug");
+
 	return 0;
 }

Re: [RFC v2 PATCH 5/7] x86/resctrl: Introduce -o debug mount option

Posted by Fenghua Yu 2 years, 6 months ago

Hi, Babu,

On 2/2/23 13:47, Babu Moger wrote:
> Add -o debug option to mount resctrl filesystem in debug mode. Debug
> option adds the files for debug purposes.
> 
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> ---
>   Documentation/x86/resctrl.rst          |    2 ++
>   arch/x86/kernel/cpu/resctrl/internal.h |    1 +
>   arch/x86/kernel/cpu/resctrl/rdtgroup.c |    7 +++++++
>   3 files changed, 10 insertions(+)
> 
> diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
> index 58b76fc75cb7..2c013c5d45fd 100644
> --- a/Documentation/x86/resctrl.rst
> +++ b/Documentation/x86/resctrl.rst
> @@ -46,6 +46,8 @@ mount options are:
>   "mba_MBps":
>   	Enable the MBA Software Controller(mba_sc) to specify MBA
>   	bandwidth in MBps
> +"debug":
> +	Lists the debug files in resctrl interface
>   
>   L2 and L3 CDP are controlled separately.
>   
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 6767c85b9699..35a9ee343fe0 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -59,6 +59,7 @@ struct rdt_fs_context {
>   	bool				enable_cdpl2;
>   	bool				enable_cdpl3;
>   	bool				enable_mba_mbps;
> +	bool				debug;
>   };
>   
>   static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index 18d458a3cba6..9b7813aa6baf 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -2555,6 +2555,7 @@ enum rdt_param {
>   	Opt_cdp,
>   	Opt_cdpl2,
>   	Opt_mba_mbps,
> +	Opt_debug,
>   	nr__rdt_params
>   };
>   
> @@ -2562,6 +2563,7 @@ static const struct fs_parameter_spec rdt_fs_parameters[] = {
>   	fsparam_flag("cdp",		Opt_cdp),
>   	fsparam_flag("cdpl2",		Opt_cdpl2),
>   	fsparam_flag("mba_MBps",	Opt_mba_mbps),
> +	fsparam_flag("debug",		Opt_debug),
>   	{}
>   };
>   
> @@ -2587,6 +2589,9 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
>   			return -EINVAL;
>   		ctx->enable_mba_mbps = true;
>   		return 0;
> +	case Opt_debug:
> +		ctx->debug = true;
> +		return 0;
>   	}
>   
>   	return -EINVAL;
> @@ -3525,6 +3530,8 @@ static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
>   	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
>   		seq_puts(seq, ",mba_MBps");
>   
> +	seq_puts(seq, ",debug");

Need to add a check here otherwise ",debug" will be always shown 
regardless "-o debug" is given or not:
+	if (ctx->debug)
+		seq_puts(seq, ",debug");

But I don't know a good way to get ctx->debug in this function yet. I 
think somehow ctx can be retrieved from kf but not sure.

> +
>   	return 0;
>   }
>   
> 
> 
Thanks.

-Fenghua

Re: [RFC v2 PATCH 5/7] x86/resctrl: Introduce -o debug mount option

Posted by Moger, Babu 2 years, 6 months ago

Hi Fenghua,

On 2/16/2023 7:42 PM, Fenghua Yu wrote:
> Hi, Babu,
>
> On 2/2/23 13:47, Babu Moger wrote:
>> Add -o debug option to mount resctrl filesystem in debug mode. Debug
>> option adds the files for debug purposes.
>>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> ---
>>   Documentation/x86/resctrl.rst          |    2 ++
>>   arch/x86/kernel/cpu/resctrl/internal.h |    1 +
>>   arch/x86/kernel/cpu/resctrl/rdtgroup.c |    7 +++++++
>>   3 files changed, 10 insertions(+)
>>
>> diff --git a/Documentation/x86/resctrl.rst 
>> b/Documentation/x86/resctrl.rst
>> index 58b76fc75cb7..2c013c5d45fd 100644
>> --- a/Documentation/x86/resctrl.rst
>> +++ b/Documentation/x86/resctrl.rst
>> @@ -46,6 +46,8 @@ mount options are:
>>   "mba_MBps":
>>       Enable the MBA Software Controller(mba_sc) to specify MBA
>>       bandwidth in MBps
>> +"debug":
>> +    Lists the debug files in resctrl interface
>>     L2 and L3 CDP are controlled separately.
>>   diff --git a/arch/x86/kernel/cpu/resctrl/internal.h 
>> b/arch/x86/kernel/cpu/resctrl/internal.h
>> index 6767c85b9699..35a9ee343fe0 100644
>> --- a/arch/x86/kernel/cpu/resctrl/internal.h
>> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
>> @@ -59,6 +59,7 @@ struct rdt_fs_context {
>>       bool                enable_cdpl2;
>>       bool                enable_cdpl3;
>>       bool                enable_mba_mbps;
>> +    bool                debug;
>>   };
>>     static inline struct rdt_fs_context *rdt_fc2context(struct 
>> fs_context *fc)
>> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c 
>> b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> index 18d458a3cba6..9b7813aa6baf 100644
>> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> @@ -2555,6 +2555,7 @@ enum rdt_param {
>>       Opt_cdp,
>>       Opt_cdpl2,
>>       Opt_mba_mbps,
>> +    Opt_debug,
>>       nr__rdt_params
>>   };
>>   @@ -2562,6 +2563,7 @@ static const struct fs_parameter_spec 
>> rdt_fs_parameters[] = {
>>       fsparam_flag("cdp",        Opt_cdp),
>>       fsparam_flag("cdpl2",        Opt_cdpl2),
>>       fsparam_flag("mba_MBps",    Opt_mba_mbps),
>> +    fsparam_flag("debug",        Opt_debug),
>>       {}
>>   };
>>   @@ -2587,6 +2589,9 @@ static int rdt_parse_param(struct fs_context 
>> *fc, struct fs_parameter *param)
>>               return -EINVAL;
>>           ctx->enable_mba_mbps = true;
>>           return 0;
>> +    case Opt_debug:
>> +        ctx->debug = true;
>> +        return 0;
>>       }
>>         return -EINVAL;
>> @@ -3525,6 +3530,8 @@ static int rdtgroup_show_options(struct 
>> seq_file *seq, struct kernfs_root *kf)
>>       if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
>>           seq_puts(seq, ",mba_MBps");
>>   +    seq_puts(seq, ",debug");
>
> Need to add a check here otherwise ",debug" will be always shown 
> regardless "-o debug" is given or not:
> +    if (ctx->debug)
> +        seq_puts(seq, ",debug");
>
> But I don't know a good way to get ctx->debug in this function yet. I 
> think somehow ctx can be retrieved from kf but not sure.

Yes. Make sense. May be i will have to save it in rdt_hw_resource then I 
can add that check.

Thanks

Babu


>
>> +
>>       return 0;
>>   }
>>
>>
> Thanks.
>
> -Fenghua