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SubjectRe: [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..

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