All of lore.kernel.org
 help / color / mirror / Atom feed
From: Ionela Voinescu <ionela.voinescu@arm.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	linux-kernel@vger.kernel.org, Sudeep Holla <sudeep.holla@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] arm64: topology: Drop the useless update to per-cpu cycles
Date: Thu, 10 Dec 2020 09:57:14 +0000	[thread overview]
Message-ID: <20201210095714.GA13331@arm.com> (raw)
In-Reply-To: <7a171f710cdc0f808a2bfbd7db839c0d265527e7.1607579234.git.viresh.kumar@linaro.org>

On Thursday 10 Dec 2020 at 11:17:40 (+0530), Viresh Kumar wrote:
> The previous call to update_freq_counters_refs() has already updated the
> per-cpu variables, don't overwrite them with the same value again.
> 
> Fixes: 4b9cf23c179a ("arm64: wrap and generalise counter read functions")
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>  arch/arm64/kernel/topology.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
> index c8308befdb1e..f6faa697e83e 100644
> --- a/arch/arm64/kernel/topology.c
> +++ b/arch/arm64/kernel/topology.c
> @@ -314,7 +314,7 @@ void topology_scale_freq_tick(void)
>  
>  	if (unlikely(core_cnt <= prev_core_cnt ||
>  		     const_cnt <= prev_const_cnt))
> -		goto store_and_exit;
> +		return;
>  
>  	/*
>  	 *	    /\core    arch_max_freq_scale
> @@ -331,10 +331,6 @@ void topology_scale_freq_tick(void)
>  
>  	scale = min_t(unsigned long, scale, SCHED_CAPACITY_SCALE);
>  	this_cpu_write(freq_scale, (unsigned long)scale);
> -
> -store_and_exit:
> -	this_cpu_write(arch_core_cycles_prev, core_cnt);
> -	this_cpu_write(arch_const_cycles_prev, const_cnt);
>  }

Right, no need for this anymore!

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>

Thank you for the fix,
Ionela.

>  
>  #ifdef CONFIG_ACPI_CPPC_LIB
> -- 
> 2.25.0.rc1.19.g042ed3e048af
> 

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Ionela Voinescu <ionela.voinescu@arm.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: topology: Drop the useless update to per-cpu cycles
Date: Thu, 10 Dec 2020 09:57:14 +0000	[thread overview]
Message-ID: <20201210095714.GA13331@arm.com> (raw)
In-Reply-To: <7a171f710cdc0f808a2bfbd7db839c0d265527e7.1607579234.git.viresh.kumar@linaro.org>

On Thursday 10 Dec 2020 at 11:17:40 (+0530), Viresh Kumar wrote:
> The previous call to update_freq_counters_refs() has already updated the
> per-cpu variables, don't overwrite them with the same value again.
> 
> Fixes: 4b9cf23c179a ("arm64: wrap and generalise counter read functions")
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>  arch/arm64/kernel/topology.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
> index c8308befdb1e..f6faa697e83e 100644
> --- a/arch/arm64/kernel/topology.c
> +++ b/arch/arm64/kernel/topology.c
> @@ -314,7 +314,7 @@ void topology_scale_freq_tick(void)
>  
>  	if (unlikely(core_cnt <= prev_core_cnt ||
>  		     const_cnt <= prev_const_cnt))
> -		goto store_and_exit;
> +		return;
>  
>  	/*
>  	 *	    /\core    arch_max_freq_scale
> @@ -331,10 +331,6 @@ void topology_scale_freq_tick(void)
>  
>  	scale = min_t(unsigned long, scale, SCHED_CAPACITY_SCALE);
>  	this_cpu_write(freq_scale, (unsigned long)scale);
> -
> -store_and_exit:
> -	this_cpu_write(arch_core_cycles_prev, core_cnt);
> -	this_cpu_write(arch_const_cycles_prev, const_cnt);
>  }

Right, no need for this anymore!

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>

Thank you for the fix,
Ionela.

>  
>  #ifdef CONFIG_ACPI_CPPC_LIB
> -- 
> 2.25.0.rc1.19.g042ed3e048af
> 

  parent reply	other threads:[~2020-12-10  9:58 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-10  5:47 [PATCH] arm64: topology: Drop the useless update to per-cpu cycles Viresh Kumar
2020-12-10  5:47 ` Viresh Kumar
2020-12-10  9:37 ` Sudeep Holla
2020-12-10  9:37   ` Sudeep Holla
2020-12-10  9:57 ` Ionela Voinescu [this message]
2020-12-10  9:57   ` Ionela Voinescu
2020-12-11  6:48 ` Viresh Kumar
2020-12-11  6:48   ` Viresh Kumar
2020-12-15 12:30   ` Catalin Marinas
2020-12-15 12:30     ` Catalin Marinas
2020-12-15 17:44 ` Catalin Marinas
2020-12-15 17:44   ` Catalin Marinas

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201210095714.GA13331@arm.com \
    --to=ionela.voinescu@arm.com \
    --cc=catalin.marinas@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sudeep.holla@arm.com \
    --cc=vincent.guittot@linaro.org \
    --cc=viresh.kumar@linaro.org \
    --cc=will@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.