Hi Reinette
On 6/24/25 18:39, Reinette Chatre wrote:
> Hi Babu,
>
> On 6/13/25 2:04 PM, Babu Moger wrote:
>> Provide the interface to display the number of counters IDs available for
>
> "Introduce the "available_mbm_cntrs" resctrl file to display the number of
> counters available ..."
Sure.
> ,
>> assignment in each domain when "mbm_event" mode is enabled.
>>
>> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
>> ---
> ...
>
>> ---
>> Documentation/filesystems/resctrl.rst | 11 ++++++
>> fs/resctrl/monitor.c | 5 ++-
>> fs/resctrl/rdtgroup.c | 48 +++++++++++++++++++++++++++
>> 3 files changed, 63 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
>> index 801914de0c81..8a2050098091 100644
>> --- a/Documentation/filesystems/resctrl.rst
>> +++ b/Documentation/filesystems/resctrl.rst
>> @@ -299,6 +299,17 @@ with the following files:
>> # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs
>> 0=32;1=32
>>
>> +"available_mbm_cntrs":
>> + The number of assignable counters available in each domain when
>
> "The number of counters available for assignment in each domain ..."
Sure.
>
>> + mbm_event mode is enabled on the system.
>> +
>> + For example, on a system with 30 available [hardware] assignable counters
>> + in each of its L3 domains:
>> + ::
>> +
>> + # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs
>> + 0=30;1=30
>> +
>> "max_threshold_occupancy":
>> Read/write file provides the largest value (in
>> bytes) at which a previously used LLC_occupancy
>> diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
>> index 92a87aa97b0f..2893da994f3c 100644
>> --- a/fs/resctrl/monitor.c
>> +++ b/fs/resctrl/monitor.c
>> @@ -924,9 +924,12 @@ int resctrl_mon_resource_init(void)
>> else if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
>> mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
>>
>> - if (r->mon.mbm_cntr_assignable)
>> + if (r->mon.mbm_cntr_assignable) {
>> resctrl_file_fflags_init("num_mbm_cntrs",
>> RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
>> + resctrl_file_fflags_init("available_mbm_cntrs",
>> + RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
>> + }
>>
>> return 0;
>> }
>> diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
>> index 90b52593ef29..08bcca9bd8b6 100644
>> --- a/fs/resctrl/rdtgroup.c
>> +++ b/fs/resctrl/rdtgroup.c
>> @@ -1853,6 +1853,48 @@ static int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of,
>> return 0;
>> }
>>
>> +static int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of,
>> + struct seq_file *s, void *v)
>> +{
>> + struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
>> + struct rdt_mon_domain *dom;
>> + bool sep = false;
>> + u32 cntrs, i;
>> + int ret = 0;
>> +
>> + cpus_read_lock();
>> + mutex_lock(&rdtgroup_mutex);
>> +
>> + rdt_last_cmd_clear();
>> +
>> + if (!resctrl_arch_mbm_cntr_assign_enabled(r)) {
>> + rdt_last_cmd_puts("mbm_cntr_assign mode is not enabled\n");
>> + ret = -EINVAL;
>> + goto unlock_cntrs_show;
>
> unlock_cntrs_show -> out_unlock (to be consistent with rest of resctrl)
>
Sure.
--
Thanks
Babu Moger
