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Instead of mapping and unmapping the completion queues memory to the host PCI address space whenever nvmet_pci_epf_cq_work() is called, map a completion queue to the host PCI address space when the completion queue is created with nvmet_pci_epf_create_cq() and unmap it when the completion queue is deleted with nvmet_pci_epf_delete_cq(). This removes the completion queue mapping/unmapping from nvmet_pci_epf_cq_work() and significantly increases performance. For a single job 4K random read QD=1 workload, the IOPS is increased from 23 KIOPS to 25 KIOPS. Some significant throughput increasde for high queue depth and large IOs workloads can also be seen. Since the functions nvmet_pci_epf_map_queue() and nvmet_pci_epf_unmap_queue() are called respectively only from nvmet_pci_epf_create_cq() and nvmet_pci_epf_delete_cq(), these functions are removed and open-coded in their respective call sites. Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Keith Busch <kbusch@kernel.org>
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 reStructuredText 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.