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There are two counters: * fq_flush_start_cnt - Increased when a TLB flush is started. * fq_flush_finish_cnt - Increased when a TLB flush is finished. The fq_flush_start_cnt is assigned to every Flush-Queue entry on its creation. When freeing entries from the Flush-Queue, the value in the entry is compared to the fq_flush_finish_cnt. The entry can only be freed when its value is less than the value of fq_flush_finish_cnt. The reason for these counters it to take advantage of IOMMU TLB flushes that happened on other CPUs. These already flushed the TLB for Flush-Queue entries on other CPUs so that they can already be freed without flushing the TLB again. This makes it less likely that the Flush-Queue is full and saves IOMMU TLB flushes. Signed-off-by: Joerg Roedel <jroedel@suse.de>
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.