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2777e73fc1
Register UFS driver to CPU latency PM QoS framework to improve UFS device random I/O performance. PM QoS initialization will insert new QoS request into the CPU latency QoS list with the maximum latency PM_QOS_DEFAULT_VALUE value. The UFS driver will vote for performance mode on scale up and power save mode for scale down. If clock scaling feature is not enabled then voting will be based on clock on or off condition. Also provide a sysfs interface to enable/disable PM QoS feature. tiotest benchmark tool I/O performance results on sm8550 platform: 1. Without PM QoS support Type (Speed in) | Average of 18 iterations Random Write(IPOS) | 41065.13 Random Read(IPOS) | 37101.3 2. With PM QoS support Type (Speed in) | Average of 18 iterations Random Write(IPOS) | 46784.9 Random Read(IPOS) | 42943.4 (Improvement with PM QoS = ~15%). Reviewed-by: Peter Wang <peter.wang@mediatek.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Co-developed-by: Nitin Rawat <quic_nitirawa@quicinc.com> Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com> Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com> Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com> Signed-off-by: Maramaina Naresh <quic_mnaresh@quicinc.com> Link: https://lore.kernel.org/r/20231219123706.6463-2-quic_mnaresh@quicinc.com Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.