linux-kernel - RE: [PATCH v4] scsi: ufs: wb: Add explicit flush

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Message-ID: <DM6PR04MB65755CFCA912182C5D5044BFFC51A@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Fri, 9 Jun 2023 10:18:07 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Lu Hongfei <luhongfei@...o.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Bart Van Assche <bvanassche@....org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Daniil Lunev <dlunev@...omium.org>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Bean Huo <beanhuo@...ron.com>,
        Peter Wang <peter.wang@...iatek.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER" 
        <linux-scsi@...r.kernel.org>
CC:     "opensource.kernel@...o.com" <opensource.kernel@...o.com>
Subject: RE: [PATCH v4] scsi: ufs: wb: Add explicit flush_threshold sysfs
 attribute

> 
> There are three flags that control Write Booster Feature:
> 
>     1. WB ON/OFF
>     2. WB Hibern Flush ON/OFF (implicitly)
>     3. WB Flush ON/OFF (explicit)
> 
> In the case of "Hibern Flush", one of the conditions for flush WB buffer is
> that avail_wb_buff < wb_flush_threshold.
> 
> As we know, different users have different requirements for power
> consumption and performance. Therefore, we need the ability to manually
> set wb_flush_threshold, so that users can easily and flexibly adjust
> the wb_flush_threshold value, thereby achieving a balance between power
> consumption and performance.
> 
> So the sysfs attribute that controls this is necessary.
> 
> The meaning of wb_flush_threshold is the percentage of WB's total size,
> such as 1 representing 10%, 2 representing 20%, and so on.
> 
> Signed-off-by: Lu Hongfei <luhongfei@...o.com>
Reviewed-by: Avri Altman <avri.altman@....com>