linux-kernel - Re: [PATCH] ACPI/NVS: Not save NVS region for new machines to accelerate S3

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Date:	Wed, 23 Jul 2014 13:35:25 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI/NVS: Not save NVS region for new machines to accelerate
 S3

On 2014年07月23日 07:40, Rafael J. Wysocki wrote:
> On Friday, July 18, 2014 01:55:22 PM Lan Tianyu wrote:
>> NVS region is saved and restored unconditionally for machines without
>> nvs_nosave quirk during S3. Tested some new machines and the operation
>> is not necessary. Saving NVS region also affects S2RAM speed. The time of
>> NVS saving and restoring depends on the size of NVS region and it consumes
>> 7~10ms normally.
>>
>> This patch is to make machines produced from 2012 to now not saving NVS region
>> to accelerate S3.
>>
>> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
>> ---
>>  drivers/acpi/sleep.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
>> index b3e3cc7..896d8be 100644
>> --- a/drivers/acpi/sleep.c
>> +++ b/drivers/acpi/sleep.c
>> @@ -322,7 +322,12 @@ static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
>>  
>>  static void acpi_sleep_dmi_check(void)
>>  {
>> +	int year;
>> +
>>  	dmi_check_system(acpisleep_dmi_table);
>> +
>> +	if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
>> +		acpi_nvs_nosave_s3();
> 
> I'd prefer the ordering here to be different so that individual quirks
> could be used to change the date-based wholesale behavior.

Ok. I will update soon.

> 
>>  }
>>  
>>  /**
>>
> 


-- 
Best regards
Tianyu Lan
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