Messages in this thread | | | From | Maramaina Naresh <> | Subject | [PATCH V3 0/2] Add CPU latency QoS support for ufs driver | Date | Tue, 12 Dec 2023 17:25:08 +0530 |
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Add CPU latency QoS support for ufs driver. This improves random io performance by 15% for ufs.
tiotest benchmark tool io performance results on sm8550 platform:
1. Without PM QoS support Type (Speed in) | Average of 18 iterations Random Read(IPOS) | 37101.3 Random Write(IPOS) | 41065.13
2. With PM QoS support Type (Speed in) | Average of 18 iterations Random Read(IPOS) | 42943.4 Random Write(IPOS) | 46784.9 (Improvement with PM QoS = ~15%).
This patch is based on below patch by Stanley Chu [1]. Moving the PM QoS code to ufshcd.c and making it generic.
[1] https://lore.kernel.org/r/20220623035052.18802-8-stanley.chu@mediatek.com
Changes from v2: - Addressed bvanassche and mani comments - Provided sysfs interface to enable/disable PM QoS feature
Changes from v1: - Addressed bvanassche comments to have the code in core ufshcd - Design is changed from per-device PM QoS to CPU latency QoS based support - Reverted existing PM QoS feature from MEDIATEK UFS driver
Maramaina Naresh (2): ufs: core: Add CPU latency QoS support for ufs driver ufs: ufs-mediatek: Enable CPU latency PM QoS support for MEDIATEK SoC
drivers/ufs/core/ufshcd.c | 127 ++++++++++++++++++++++++++++++++ drivers/ufs/host/ufs-mediatek.c | 20 +---- drivers/ufs/host/ufs-mediatek.h | 3 - include/ufs/ufshcd.h | 6 ++ 4 files changed, 136 insertions(+), 20 deletions(-)
-- 2.17.1
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