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6b1e4efb6f
Optimize the contpte implementation to fix some of the exit/munmap/dontneed performance regression introduced by the initial contpte commit. Subsequent patches will solve it entirely. During exit(), munmap() or madvise(MADV_DONTNEED), mappings must be cleared. Previously this was done 1 PTE at a time. But the core-mm supports batched clear via the new [get_and_]clear_full_ptes() APIs. So let's implement those APIs and for fully covered contpte mappings, we no longer need to unfold the contpte. This significantly reduces unfolding operations, reducing the number of tlbis that must be issued. Link: https://lkml.kernel.org/r/20240215103205.2607016-15-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Tested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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