linux-kernel - Re: [PATCH RESEND 2/2] perf/x86/lbr: Move cpuc->lbr

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Date:   Wed, 21 Apr 2021 10:38:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Like Xu <like.xu@...ux.intel.com>
Cc:     Kan Liang <kan.liang@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 2/2] perf/x86/lbr: Move cpuc->lbr_xsave allocation
 out of sleeping region

On Wed, Apr 21, 2021 at 10:18:25AM +0800, Like Xu wrote:
> -int x86_reserve_hardware(void)
> +int x86_reserve_hardware(struct perf_event *event)
>  {
>  	int err = 0;
>  
> @@ -398,8 +398,10 @@ int x86_reserve_hardware(void)
>  		if (atomic_read(&pmc_refcount) == 0) {
>  			if (!reserve_pmc_hardware())
>  				err = -EBUSY;
> -			else
> +			else {
>  				reserve_ds_buffers();
> +				reserve_lbr_buffers(event);
> +			}
>  		}
>  		if (!err)
>  			atomic_inc(&pmc_refcount);
> @@ -650,7 +652,7 @@ static int __x86_pmu_event_init(struct perf_event *event)
>  	if (!x86_pmu_initialized())
>  		return -ENODEV;
>  
> -	err = x86_reserve_hardware();
> +	err = x86_reserve_hardware(event);
>  	if (err)
>  		return err;
>  

This is still complete garbage..