linux-kernel - Re: [PATCH][RFC] ACPI: acpi_pad: Do not launch acpi

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Date:   Sat, 5 May 2018 19:52:04 +0800
From:   Yu Chen <yu.c.chen@...el.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Rui Zhang <rui.zhang@...el.com>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH][RFC] ACPI: acpi_pad: Do not launch acpi_pad threads on
 idle cpus

On Fri, May 04, 2018 at 04:08:42PM +0800, Chen Yu wrote:
> According to current implementation of acpi_pad driver,
> it does not make sense to spawn any power saving threads
> on the cpus which are already idle - it might bring
> unnecessary overhead on these idle cpus and causes power
> waste. So verify the condition that if the number of 'busy'
> cpus exceeds the amount of the 'forced idle' cpus - This is
> applicable due to round-robin attribute of the power saving
> threads, otherwise ignore the setting/ACPI notification.
> 
> Suggested-by: Lenny Szubowicz <lszubowi@...hat.com>
> Suggested-by: Len Brown <lenb@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Cc: Rui Zhang <rui.zhang@...el.com>
> Cc: linux-acpi@...r.kernel.org
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> ---
>
Please ignore this one, I'm sending out another version.
Thanks,
Yu