linux-kernel - Re: [PATCH V2 2/3] perf/x86/intel/bm.c: Add Intel Branch Monitoring support

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Message-ID: <20171120115714.hden247iet4bf2t5@hirez.programming.kicks-ass.net>
Date:   Mon, 20 Nov 2017 12:57:14 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Megha Dey <megha.dey@...ux.intel.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, andriy.shevchenko@...ux.intel.com,
        kstewart@...uxfoundation.org, yu-cheng.yu@...el.com,
        len.brown@...el.com, gregkh@...uxfoundation.org, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, vikas.shivappa@...ux.intel.com,
        pombredanne@...b.com, me@...ehuey.com, bp@...e.de,
        grzegorz.andrejczuk@...el.com, tony.luck@...el.com, corbet@....net,
        ravi.v.shankar@...el.com, megha.dey@...el.com
Subject: Re: [PATCH V2 2/3] perf/x86/intel/bm.c: Add Intel Branch Monitoring
 support

On Fri, Nov 17, 2017 at 05:54:05PM -0800, Megha Dey wrote:
> +	mutex_lock(&bm_counter_mutex);
> +	for (i = 0; i < BM_MAX_COUNTERS; i++) {
> +		if (bm_counter_owner[i] == NULL) {
> +			counter_to_use = i;
> +			bm_counter_owner[i] = event;
> +			break;
> +		}
> +	}
> +	mutex_unlock(&bm_counter_mutex);
> +
> +	if (counter_to_use == -1)
> +		return -EBUSY;

> +static struct pmu intel_bm_pmu = {
> +	.task_ctx_nr     = perf_sw_context,
> +	.attr_groups     = intel_bm_attr_groups,
> +	.event_init      = intel_bm_event_init,
> +	.add             = intel_bm_event_add,
> +	.del             = intel_bm_event_del,
> +};

Still horrid.. still no.