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The existing write same routine within the cxlflash driver uses a statically defined value for the maximum write same transfer length. While this is close to the value reflected by the original device that was supported by cxlflash, newer devices are capable of much larger lengths. Supporting what the device is capable of offers substantial performance improvement as the scrub routine within cxlflash operates on 'chunk size' units (256MB with a 4K sector size). Instead of a #define, use the write same maximum length that is stored in the block layer in units of 512 byte sectors. This value is initially determined from the block limits VPD page during device discovery and can also be manipulated from sysfs. As a general cleanup, designate the timeout used when executing the write same command as constant. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.