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At the moment we have to rather sub-optimal flushing behaviours: - flush_tlb_mm() will flush the PWC which is unnecessary (for example when doing a fork) - A large unmap will call flush_tlb_pwc() multiple times causing us to perform that fairly expensive operation repeatedly. This happens often in batches of 3 on every new process. So we change flush_tlb_mm() to only flush the TLB, and we use the existing "need_flush_all" flag in struct mmu_gather to indicate that the PWC needs flushing. Unfortunately, flush_tlb_range() still needs to do a full flush for now as it's used by the THP collapsing. We will fix that later. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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.