linux-kernel - Re: [PATCH v3 2/2] perf/bench/numa: Handle discontiguous/sparse numa nodes

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Message-Id: <20171031151658.clq6qmdfw3gj6afg@naverao1-tp.localdomain>
Date:   Tue, 31 Oct 2017 20:46:58 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     sathnaga@...ux.vnet.ibm.com
Cc:     acme@...nel.org, mingo@...nel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, srikar@...ux.vnet.ibm.com,
        bala24@...ux.vnet.ibm.com
Subject: Re: [PATCH v3 2/2] perf/bench/numa: Handle discontiguous/sparse numa
 nodes

On 2017/08/21 10:17AM, sathnaga@...ux.vnet.ibm.com wrote:
> From: Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>
> 
> Certain systems are designed to have sparse/discontiguous nodes.
> On such systems, perf bench numa hangs, shows wrong number of nodes
> and shows values for non-existent nodes. Handle this by only
> taking nodes that are exposed by kernel to userspace.
> 
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Reviewed-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> Signed-off-by: Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>
> Signed-off-by: Balamuruhan S <bala24@...ux.vnet.ibm.com>
> ---
>  tools/perf/bench/numa.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c
> index 2483174..d4cccc4 100644
> --- a/tools/perf/bench/numa.c
> +++ b/tools/perf/bench/numa.c
> @@ -287,12 +287,12 @@ static cpu_set_t bind_to_cpu(int target_cpu)
> 
>  static cpu_set_t bind_to_node(int target_node)
>  {
> -	int cpus_per_node = g->p.nr_cpus/g->p.nr_nodes;
> +	int cpus_per_node = g->p.nr_cpus/nr_numa_nodes();
>  	cpu_set_t orig_mask, mask;
>  	int cpu;
>  	int ret;
> 
> -	BUG_ON(cpus_per_node*g->p.nr_nodes != g->p.nr_cpus);
> +	BUG_ON(cpus_per_node*nr_numa_nodes() != g->p.nr_cpus);
>  	BUG_ON(!cpus_per_node);
> 
>  	ret = sched_getaffinity(0, sizeof(orig_mask), &orig_mask);
> @@ -692,7 +692,7 @@ static int parse_setup_node_list(void)
>  			int i;
> 
>  			for (i = 0; i < mul; i++) {
> -				if (t >= g->p.nr_tasks) {
> +				if (t >= g->p.nr_tasks || !node_has_cpus(bind_node)) {
>  					printf("\n# NOTE: ignoring bind NODEs starting at NODE#%d\n", bind_node);
>  					goto out;
>  				}
> @@ -973,6 +973,7 @@ static void calc_convergence(double runtime_ns_max, double *convergence)
>  	int node;
>  	int cpu;
>  	int t;
> +	int processes;
> 
>  	if (!g->p.show_convergence && !g->p.measure_convergence)
>  		return;
> @@ -1007,13 +1008,14 @@ static void calc_convergence(double runtime_ns_max, double *convergence)
>  	sum = 0;
> 
>  	for (node = 0; node < g->p.nr_nodes; node++) {
> +		if (!is_node_present(node))
> +			continue;
>  		nr = nodes[node];
>  		nr_min = min(nr, nr_min);
>  		nr_max = max(nr, nr_max);
>  		sum += nr;
>  	}
>  	BUG_ON(nr_min > nr_max);
> -

Looks like an un-necessary change there.

- Naveen

>  	BUG_ON(sum > g->p.nr_tasks);
> 
>  	if (0 && (sum < g->p.nr_tasks))
> @@ -1027,8 +1029,9 @@ static void calc_convergence(double runtime_ns_max, double *convergence)
>  	process_groups = 0;
> 
>  	for (node = 0; node < g->p.nr_nodes; node++) {
> -		int processes = count_node_processes(node);
> -
> +		if (!is_node_present(node))
> +			continue;
> +		processes = count_node_processes(node);
>  		nr = nodes[node];
>  		tprintf(" %2d/%-2d", nr, processes);
> 
> @@ -1334,7 +1337,7 @@ static void print_summary(void)
> 
>  	printf("\n ###\n");
>  	printf(" # %d %s will execute (on %d nodes, %d CPUs):\n",
> -		g->p.nr_tasks, g->p.nr_tasks == 1 ? "task" : "tasks", g->p.nr_nodes, g->p.nr_cpus);
> +		g->p.nr_tasks, g->p.nr_tasks == 1 ? "task" : "tasks", nr_numa_nodes(), g->p.nr_cpus);
>  	printf(" #      %5dx %5ldMB global  shared mem operations\n",
>  			g->p.nr_loops, g->p.bytes_global/1024/1024);
>  	printf(" #      %5dx %5ldMB process shared mem operations\n",
> -- 
> 2.7.4
> 
> --
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