Re: [PATCH v6 13/24] x86/resctrl: Queue mon_event_read() instead of sending an IPI

[Reinette Chatre]

Hi James,

On 9/14/2023 10:21 AM, James Morse wrote:

...
 
> diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> index b44c487727d4..bd263b9a0abd 100644
> --- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> +++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> @@ -19,6 +19,7 @@
>  #include <linux/kernfs.h>
>  #include <linux/seq_file.h>
>  #include <linux/slab.h>
> +#include <linux/tick.h>
>  #include "internal.h"
>  

Please keep the empty line between groups of header files.

>  /*
> @@ -520,12 +521,24 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
>  	return ret;
>  }
>  
> +static int smp_mon_event_count(void *arg)
> +{
> +	mon_event_count(arg);
> +
> +	return 0;
> +}
> +
>  void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
>  		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
>  		    int evtid, int first)
>  {
> +	int cpu;
> +
> +	/* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */

This comment is not accurate at this point. It should accompany the code it applies to.

> +	lockdep_assert_held(&rdtgroup_mutex);
> +
>  	/*
> -	 * setup the parameters to send to the IPI to read the data.
> +	 * Setup the parameters to pass to mon_event_count() to read the data.
>  	 */
>  	rr->rgrp = rdtgrp;
>  	rr->evtid = evtid;


Reinette