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Kernel: Skip TLB flushes while cloning regions in sys$fork()
Since we know for sure that the virtual memory regions in the new process being created are not being used on any CPU, there's no need to do TLB flushes for every mapped page.
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3 changed files with 10 additions and 4 deletions
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@ -385,7 +385,7 @@ void Region::set_page_directory(PageDirectory& page_directory)
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m_page_directory = page_directory;
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}
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bool Region::map(PageDirectory& page_directory)
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bool Region::map(PageDirectory& page_directory, ShouldFlushTLB should_flush_tlb)
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{
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ScopedSpinLock lock(s_mm_lock);
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ScopedSpinLock page_lock(page_directory.get_lock());
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@ -403,7 +403,8 @@ bool Region::map(PageDirectory& page_directory)
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++page_index;
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}
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if (page_index > 0) {
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MM.flush_tlb(m_page_directory, vaddr(), page_index);
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if (should_flush_tlb == ShouldFlushTLB::Yes)
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MM.flush_tlb(m_page_directory, vaddr(), page_index);
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return page_index == page_count();
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}
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return false;
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