Re: [PATCH v9 21/26] x86/resctrl: Report "Unassigned" for MBM events in mbm_cntr_assign mode
From: Reinette Chatre
Date: Mon Nov 18 2024 - 12:40:13 EST
Hi Babu,
On 10/29/24 4:21 PM, Babu Moger wrote:
> In mbm_cntr_assign mode, the hardware counter should be assigned to read
> the MBM events.
>
> Report "Unassigned" in case the user attempts to read the events without
> assigning the counter.
>
> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
> ---
> v9: Used is_mbm_event() to check the event type.
> Minor user documentation update.
>
> v8: Used MBM_EVENT_ARRAY_INDEX to get the index for the MBM event.
> Documentation update to make the text generic.
>
> v7: Moved the documentation under "mon_data".
> Updated the text little bit.
>
> v6: Added more explaination in the resctrl.rst
> Added checks to detect "Unassigned" before reading RMID.
>
> v5: New patch.
> ---
> Documentation/arch/x86/resctrl.rst | 10 ++++++++++
> arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 12 +++++++++++-
> 2 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
> index 2bc58d974934..864fc004d646 100644
> --- a/Documentation/arch/x86/resctrl.rst
> +++ b/Documentation/arch/x86/resctrl.rst
> @@ -430,6 +430,16 @@ When monitoring is enabled all MON groups will also contain:
> for the L3 cache they occupy). These are named "mon_sub_L3_YY"
> where "YY" is the node number.
>
> + When supported the 'mbm_cntr_assign' mode allows users to assign a
Could you please do through the documentation changes and make all the quote
usage consistent with existing styles? For example, in this series "mbm_cntr_assign"
is used in doc in various ways ... within double quotes, within single quotes, as
well as without any quotes.
> + counter to mon_hw_id, event pair enabling bandwidth monitoring for
> + as long as the counter remains assigned. The hardware will continue
> + tracking the assigned mon_hw_id until the user manually unassigns
> + it, ensuring that counters are not reset during this period. With
> + a limited number of counters, the system may run out of assignable
> + counters. In that case, MBM event counters will return "Unassigned"
Please review style for all quote usage, for example, "Unassigned" above is
also not consistent.
> + when the event is read. Users must manually assign a counter to read
> + the events.
> +
Reinette