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Re: [PATCH 14/21] x86/intel_rdt/cqm: Add mon_data

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On Mon, 26 Jun 2017, Vikas Shivappa wrote:

> Add a mon_data directory for the root rdtgroup and all other rdtgroups.
> The directory holds all of the monitored data for all domains and events
> of all resources being monitored.

Again. This does two things at once. Move the existing code to a new file
and add the monitoring stuff. Please split it apart.

> +static bool __mon_event_count(u32 rmid, struct rmid_read *rr)
> +{
> +	u64 tval;
> +
> +	tval = __rmid_read(rmid, rr->evtid);
> +	if (tval & (RMID_VAL_ERROR | RMID_VAL_UNAVAIL)) {
> +		rr->val = tval;
> +		return false;
> +	}
> +	switch (rr->evtid) {
> +	case QOS_L3_OCCUP_EVENT_ID:
> +		rr->val += tval;
> +		return true;
> +	default:
> +		return false;

I have no idea what that return code means. 

> +	}
> +}
> +
> +void mon_event_count(void *info)

Some explanation why this is a void pointer and how that function is called
(I assume it's via IPI) would be appreciated.

> +{
> +	struct rdtgroup *rdtgrp, *entry;
> +	struct rmid_read *rr = info;
> +	struct list_head *llist;

  *head;

> +
> +	rdtgrp = rr->rgrp;
> +
> +	if (!__mon_event_count(rdtgrp->rmid, rr))
> +		return;
> +
> +	/*
> +	 * For Ctrl groups read data from child monitor groups.
> +	 */
> +	llist = &rdtgrp->crdtgrp_list;
> +
> +	if (rdtgrp->type == RDTCTRL_GROUP) {
> +		list_for_each_entry(entry, llist, crdtgrp_list) {
> +			if (!__mon_event_count(entry->rmid, rr))
> +				return;
> +		}
> +	}
> +}

> +static int get_rdt_resourceid(struct rdt_resource *r)
> +{
> +	if (r > (rdt_resources_all + RDT_NUM_RESOURCES - 1) ||
> +	    r < rdt_resources_all ||
> +	    ((r - rdt_resources_all) % sizeof(struct rdt_resource)))
> +		return -EINVAL;

If that ever happens, then you have other problems than a wrong pointer.

> +
> +	return ((r - rdt_resources_all) / sizeof(struct rdt_resource));

Moo. Can't you simply put an index field into struct rdt_resource,
intialize it with the resource ID and use that?

Thanks,

	tglx

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[PATCH V1 00/21] x86/cqm3: Resctrl based cqm Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
  [PATCH 16/21] x86/intel_rdt/cqm: Add mount,umount support Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 16/21] x86/intel_rdt/cqm: Add mount,umount support Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 15:30 +0200
  [PATCH 20/21] x86/intel_rdt/mbm: Add mbm counter initialization Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
  [PATCH 13/21] x86/intel_rdt/cqm: Add cpus file support Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 13/21] x86/intel_rdt/cqm: Add cpus file support Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 13:20 +0200
    Re: [PATCH 13/21] x86/intel_rdt/cqm: Add cpus file support Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 14:40 +0200
  [PATCH 15/21] x86/intel_rdt/cqm: Add rmdir support Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 15/21] x86/intel_rdt/cqm: Add rmdir support Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 15:20 +0200
  [PATCH 03/21] x86/intel_rdt/cqm: Documentation for resctrl based RDT Monitoring Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
  [PATCH 21/21] x86/intel_rdt/mbm: Handle counter overflow Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 21/21] x86/intel_rdt/mbm: Handle counter overflow Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 16:00 +0200
  [PATCH 14/21] x86/intel_rdt/cqm: Add mon_data Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 14/21] x86/intel_rdt/cqm: Add mon_data Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 14:50 +0200
  [PATCH 17/21] x86/intel_rdt/cqm: Add sched_in support Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 17/21] x86/intel_rdt/cqm: Add sched_in support Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 15:40 +0200
  [PATCH 12/21] x86/intel_rdt/cqm: Add tasks file support Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 12/21] x86/intel_rdt/cqm: Add tasks file support Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 13:10 +0200
  [PATCH 08/21] x86/intel_rdt/cqm: Add RMID(Resource monitoring ID) management Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2017-06-26 21:00 +0200
    Re: [PATCH 08/21] x86/intel_rdt/cqm: Add RMID(Resource monitoring  ID) management Thomas Gleixner <tglx@linutronix.de> - 2017-07-02 12:10 +0200
      Re: [PATCH 08/21] x86/intel_rdt/cqm: Add RMID(Resource monitoring  ID) management Thomas Gleixner <tglx@linutronix.de> - 2017-07-03 12:00 +0200

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