Re: [PATCH V3 4/9] tracing/hwlat: Implement the per-cpu mode

[Juri Lelli <juri.lelli@redhat.com>]

Hi,

On 14/05/21 22:51, Daniel Bristot de Oliveira wrote:

[...]

> +/**
> + * start_per_cpu_kthread - Kick off the hardware latency sampling/detector kthreads
> + *
> + * This starts the kernel threads that will sit on potentially all cpus and
> + * sample the CPU timestamp counter (TSC or similar) and look for potential
> + * hardware latencies.
> + */
> +static int start_per_cpu_kthreads(struct trace_array *tr)
> +{
> +	struct cpumask *current_mask = &save_cpumask;
> +	struct cpumask *this_cpumask;
> +	struct task_struct *kthread;
> +	char comm[24];
> +	int cpu;
> +
> +	if (!alloc_cpumask_var(&this_cpumask, GFP_KERNEL))
> +		return -ENOMEM;

Is this_cpumask actually used anywhere?

Thanks,
Juri