From: Can Guo <cang@codeaurora.org>
To: Avri Altman <avri.altman@wdc.com>
Cc: "James E . J . Bottomley" <jejb@linux.vnet.ibm.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
gregkh@linuxfoundation.org, Bart Van Assche <bvanassche@acm.org>,
yongmyung lee <ymhungry.lee@samsung.com>,
Daejun Park <daejun7.park@samsung.com>,
alim.akhtar@samsung.com, asutoshd@codeaurora.org,
Zang Leigang <zangleigang@hisilicon.com>,
Avi Shchislowski <avi.shchislowski@wdc.com>,
Bean Huo <beanhuo@micron.com>,
stanley.chu@mediatek.com
Subject: Re: [PATCH v5 04/10] scsi: ufshpb: Make eviction depends on region's reads
Date: Mon, 15 Mar 2021 16:30:29 +0800 [thread overview]
Message-ID: <7cf2ce1235075c2925561d180b1bd233@codeaurora.org> (raw)
In-Reply-To: <20210302132503.224670-5-avri.altman@wdc.com>
On 2021-03-02 21:24, Avri Altman wrote:
> In host mode, eviction is considered an extreme measure.
> verify that the entering region has enough reads, and the exiting
> region has much less reads.
>
> Signed-off-by: Avri Altman <avri.altman@wdc.com>
> ---
> drivers/scsi/ufs/ufshpb.c | 20 +++++++++++++++++++-
> 1 file changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> index a8f8d13af21a..6f4fd22eaf2f 100644
> --- a/drivers/scsi/ufs/ufshpb.c
> +++ b/drivers/scsi/ufs/ufshpb.c
> @@ -17,6 +17,7 @@
> #include "../sd.h"
>
> #define ACTIVATION_THRESHOLD 4 /* 4 IOs */
> +#define EVICTION_THRESHOLD (ACTIVATION_THRESHOLD << 6) /* 256 IOs */
>
> /* memory management */
> static struct kmem_cache *ufshpb_mctx_cache;
> @@ -1050,6 +1051,13 @@ static struct ufshpb_region
> *ufshpb_victim_lru_info(struct ufshpb_lu *hpb)
> if (ufshpb_check_srgns_issue_state(hpb, rgn))
> continue;
>
> + /*
> + * in host control mode, verify that the exiting region
> + * has less reads
> + */
> + if (hpb->is_hcm && rgn->reads > (EVICTION_THRESHOLD >> 1))
> + continue;
> +
> victim_rgn = rgn;
> break;
> }
> @@ -1235,7 +1243,7 @@ static int ufshpb_issue_map_req(struct ufshpb_lu
> *hpb,
>
> static int ufshpb_add_region(struct ufshpb_lu *hpb, struct
> ufshpb_region *rgn)
> {
> - struct ufshpb_region *victim_rgn;
> + struct ufshpb_region *victim_rgn = NULL;
> struct victim_select_info *lru_info = &hpb->lru_info;
> unsigned long flags;
> int ret = 0;
> @@ -1263,6 +1271,16 @@ static int ufshpb_add_region(struct ufshpb_lu
> *hpb, struct ufshpb_region *rgn)
> * because the device could detect this region
> * by not issuing HPB_READ
> */
> +
> + /*
> + * in host control mode, verify that the entering
> + * region has enough reads
> + */
Maybe merge the new comments with the original comments above?
Thanks,
Can Guo.
> + if (hpb->is_hcm && rgn->reads < EVICTION_THRESHOLD) {
> + ret = -EACCES;
> + goto out;
> + }
> +
> victim_rgn = ufshpb_victim_lru_info(hpb);
> if (!victim_rgn) {
> dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
next prev parent reply other threads:[~2021-03-15 8:31 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 13:24 [PATCH v5 00/10] Add Host control mode to HPB Avri Altman
2021-03-02 13:24 ` [PATCH v5 01/10] scsi: ufshpb: Cache HPB Control mode on init Avri Altman
2021-03-02 13:24 ` [PATCH v5 02/10] scsi: ufshpb: Add host control mode support to rsp_upiu Avri Altman
2021-03-02 13:24 ` [PATCH v5 03/10] scsi: ufshpb: Add region's reads counter Avri Altman
2021-03-11 7:52 ` Can Guo
2021-03-11 8:04 ` Avri Altman
2021-03-11 8:07 ` Can Guo
2021-03-15 3:16 ` Can Guo
2021-03-15 9:20 ` Avri Altman
2021-03-15 9:31 ` Can Guo
2021-03-17 9:19 ` Avri Altman
2021-03-15 8:40 ` Can Guo
2021-03-15 9:22 ` Avri Altman
2021-03-02 13:24 ` [PATCH v5 04/10] scsi: ufshpb: Make eviction depends on region's reads Avri Altman
2021-03-11 7:53 ` Can Guo
2021-03-11 8:06 ` Avri Altman
2021-03-15 8:30 ` Can Guo [this message]
2021-03-16 8:34 ` Avri Altman
2021-03-02 13:24 ` [PATCH v5 05/10] scsi: ufshpb: Region inactivation in host mode Avri Altman
2021-03-11 8:20 ` Can Guo
2021-03-11 9:03 ` Avri Altman
2021-03-15 4:02 ` Can Guo
2021-03-15 7:33 ` Can Guo
2021-03-16 8:30 ` Avri Altman
2021-03-17 1:23 ` Can Guo
[not found] ` <CGME20210316083014epcas2p32d6b84e689cdbe06ee065c870b236d65@epcms2p3>
2021-03-17 2:28 ` Daejun Park
2021-03-17 4:41 ` Can Guo
2021-03-17 7:59 ` Avri Altman
[not found] ` <CGME20210316083014epcas2p32d6b84e689cdbe06ee065c870b236d65@epcms2p4>
2021-03-17 5:19 ` Daejun Park
2021-03-17 5:34 ` Can Guo
[not found] ` <CGME20210316083014epcas2p32d6b84e689cdbe06ee065c870b236d65@epcms2p6>
2021-03-17 5:42 ` Daejun Park
2021-03-02 13:24 ` [PATCH v5 06/10] scsi: ufshpb: Add hpb dev reset response Avri Altman
2021-03-15 1:34 ` Can Guo
2021-03-15 6:40 ` Can Guo
2021-03-15 7:42 ` Avri Altman
2021-03-17 10:56 ` Can Guo
2021-03-17 11:23 ` Avri Altman
2021-03-17 12:12 ` Can Guo
2021-03-17 12:22 ` Avri Altman
2021-03-17 13:50 ` Can Guo
2021-03-17 14:22 ` Avri Altman
2021-03-17 14:36 ` Can Guo
2021-03-17 15:46 ` Avri Altman
2021-03-18 1:00 ` Can Guo
2021-03-18 8:04 ` Avri Altman
2021-03-02 13:25 ` [PATCH v5 07/10] scsi: ufshpb: Add "Cold" regions timer Avri Altman
2021-03-15 1:37 ` Can Guo
2021-03-15 7:54 ` Avri Altman
2021-03-15 9:36 ` Can Guo
2021-03-16 9:21 ` Avri Altman
2021-03-17 2:45 ` Can Guo
2021-03-17 7:55 ` Avri Altman
2021-06-01 16:22 ` Bart Van Assche
2021-03-02 13:25 ` [PATCH v5 08/10] scsi: ufshpb: Limit the number of inflight map requests Avri Altman
2021-03-15 8:31 ` Can Guo
2021-03-16 8:32 ` Avri Altman
2021-03-02 13:25 ` [PATCH v5 09/10] scsi: ufshpb: Add support for host control mode Avri Altman
2021-03-02 13:25 ` [PATCH v5 10/10] scsi: ufshpb: Make host mode parameters configurable Avri Altman
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