linux-kernel - Re: [RFC PATCH 12/15] loongarch/perf: Remove driver-specific throttle support

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Message-ID: <6777794d.1b9e4.196a851ddc0.Coremail.chenhuacai@loongson.cn>
Date: Wed, 7 May 2025 09:17:39 +0800 (GMT+08:00)
From: 陈华才 <chenhuacai@...ngson.cn>
To: kan.liang@...ux.intel.com
Cc: peterz@...radead.org, mingo@...hat.com, namhyung@...nel.org,
	irogers@...gle.com, mark.rutland@....com,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	eranian@...gle.com, ctshao@...gle.com, tmricht@...ux.ibm.com,
	"Bibo Mao" <maobibo@...ngson.cn>, loongarch@...ts.linux.dev
Subject: Re: [RFC PATCH 12/15] loongarch/perf: Remove driver-specific
 throttle support

Hi, Liang,

Since which version we need this patch? I mean which versions this patch should be backported.
And you need to CC loongarch@...ts.linux.dev.

Huacai


> -----原始邮件-----
> 发件人: kan.liang@...ux.intel.com
> 发送时间:2025-05-07 00:47:37 (星期三)
> 收件人: peterz@...radead.org, mingo@...hat.com, namhyung@...nel.org, irogers@...gle.com, mark.rutland@....com, linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
> 抄送: eranian@...gle.com, ctshao@...gle.com, tmricht@...ux.ibm.com, "Kan Liang" <kan.liang@...ux.intel.com>, "Bibo Mao" <maobibo@...ngson.cn>, "Huacai Chen" <chenhuacai@...ngson.cn>
> 主题: [RFC PATCH 12/15] loongarch/perf: Remove driver-specific throttle support
> 
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> The throttle support has been added in the generic code. Remove
> the driver-specific throttle support.
> 
> Besides the throttle, perf_event_overflow may return true because of
> event_limit. It already does an inatomic event disable. The pmu->stop
> is not required either.
> 
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> Cc: Bibo Mao <maobibo@...ngson.cn>
> Cc: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>  arch/loongarch/kernel/perf_event.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/loongarch/kernel/perf_event.c b/arch/loongarch/kernel/perf_event.c
> index f86a4b838dd7..8ad098703488 100644
> --- a/arch/loongarch/kernel/perf_event.c
> +++ b/arch/loongarch/kernel/perf_event.c
> @@ -479,8 +479,7 @@ static void handle_associated_event(struct cpu_hw_events *cpuc, int idx,
>  	if (!loongarch_pmu_event_set_period(event, hwc, idx))
>  		return;
>  
> -	if (perf_event_overflow(event, data, regs))
> -		loongarch_pmu_disable_event(idx);
> +	perf_event_overflow(event, data, regs);
>  }
>  
>  static irqreturn_t pmu_handle_irq(int irq, void *dev)
> -- 
> 2.38.1


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