linux-kernel - RE: [PATCH 4/8] scsi: ufshpb: Make eviction depends on region's reads

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Message-ID: <1891546521.01612153681714.JavaMail.epsvc@epcpadp4>
Date:   Mon, 01 Feb 2021 12:59:33 +0900
From:   Daejun Park <daejun7.park@...sung.com>
To:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Bart Van Assche <bvanassche@....org>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Daejun Park <daejun7.park@...sung.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        Zang Leigang <zangleigang@...ilicon.com>,
        Avi Shchislowski <avi.shchislowski@....com>,
        Bean Huo <beanhuo@...ron.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        Avri Altman <avri.altman@....com>
Subject: RE: [PATCH 4/8] scsi: ufshpb: Make eviction depends on region's
 reads

Hi Avri,

> +		/*
> +		 * in host control mode, verify that the exiting region
> +		 * has less reads
> +		 */
> +		if (ufshpb_mode == HPB_HOST_CONTROL &&
> +		    atomic64_read(&rgn->reads) > (EVICTION_THRSHLD >> 1))
Why we use shifted value to verify less read? I think we should use another
value to verify.

Thanks,
Daejun