lkml.org 
[lkml]   [2020]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRE: [PATCH v11 0/4] scsi: ufs: Add Host Performance Booster Support
    From
    Date
    Hi All,

    I want to know how to improve this patch.
    Could you review this patch?

    Martin,

    Can we move forward with this one?

    Thanks,
    Daejun

    > Changelog:
    >
    > v10 -> v11
    > Add a newline at end the last line on Kconfig file.
    >
    > v9 -> v10
    > 1. Fix 64-bit division error
    > 2. Fix problems commentted in Bart's review.
    >
    > v8 -> v9
    > 1. Change sysfs initialization.
    > 2. Change reading descriptor during HPB initialization
    > 3. Fix problems commentted in Bart's review.
    > 4. Change base commit from 5.9/scsi-queue to 5.10/scsi-queue.
    >
    > v7 -> v8
    > Remove wrongly added tags.
    >
    > v6 -> v7
    > 1. Remove UFS feature layer.
    > 2. Cleanup for sparse error.
    >
    > v5 -> v6
    > Change base commit to b53293fa662e28ae0cdd40828dc641c09f133405
    >
    > v4 -> v5
    > Delete unused macro define.
    >
    > v3 -> v4
    > 1. Cleanup.
    >
    > v2 -> v3
    > 1. Add checking input module parameter value.
    > 2. Change base commit from 5.8/scsi-queue to 5.9/scsi-queue.
    > 3. Cleanup for unused variables and label.
    >
    > v1 -> v2
    > 1. Change the full boilerplate text to SPDX style.
    > 2. Adopt dynamic allocation for sub-region data structure.
    > 3. Cleanup.
    >
    > NAND flash memory-based storage devices use Flash Translation Layer (FTL)
    > to translate logical addresses of I/O requests to corresponding flash
    > memory addresses. Mobile storage devices typically have RAM with
    > constrained size, thus lack in memory to keep the whole mapping table.
    > Therefore, mapping tables are partially retrieved from NAND flash on
    > demand, causing random-read performance degradation.
    >
    > To improve random read performance, JESD220-3 (HPB v1.0) proposes HPB
    > (Host Performance Booster) which uses host system memory as a cache for the
    > FTL mapping table. By using HPB, FTL data can be read from host memory
    > faster than from NAND flash memory.
    >
    > The current version only supports the DCM (device control mode).
    > This patch consists of 3 parts to support HPB feature.
    >
    > 1) HPB probe and initialization process
    > 2) READ -> HPB READ using cached map information
    > 3) L2P (logical to physical) map management
    >
    > In the HPB probe and init process, the device information of the UFS is
    > queried. After checking supported features, the data structure for the HPB
    > is initialized according to the device information.
    >
    > A read I/O in the active sub-region where the map is cached is changed to
    > HPB READ by the HPB.
    >
    > The HPB manages the L2P map using information received from the
    > device. For active sub-region, the HPB caches through ufshpb_map
    > request. For the in-active region, the HPB discards the L2P map.
    > When a write I/O occurs in an active sub-region area, associated dirty
    > bitmap checked as dirty for preventing stale read.
    >
    > HPB is shown to have a performance improvement of 58 - 67% for random read
    > workload. [1]
    >
    > This series patches are based on the 5.9/scsi-queue branch.
    >
    > [1]:
    > https://www.usenix.org/conference/hotstorage17/program/presentation/jeong
    >
    > Daejun park (4):
    > scsi: ufs: Add HPB feature related parameters
    > scsi: ufs: Introduce HPB feature
    > scsi: ufs: L2P map management for HPB read
    > scsi: ufs: Prepare HPB read for cached sub-region
    >
    > drivers/scsi/ufs/Kconfig | 10 +
    > drivers/scsi/ufs/Makefile | 1 +
    > drivers/scsi/ufs/ufs.h | 47 +
    > drivers/scsi/ufs/ufshcd.c | 60 ++
    > drivers/scsi/ufs/ufshcd.h | 23 +-
    > drivers/scsi/ufs/ufshpb.c | 1845 ++++++++++++++++++++++++++++++++++++++++
    > drivers/scsi/ufs/ufshpb.h | 229 +++++
    > 7 files changed, 2214 insertions(+), 1 deletion(-)
    > created mode 100644 drivers/scsi/ufs/ufshpb.c
    > created mode 100644 drivers/scsi/ufs/ufshpb.h

    \
     
     \ /
      Last update: 2020-09-16 01:10    [W:3.899 / U:0.240 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site