https://github.com/torvalds/linux
Revision 1cf35d47712dd5dc4d62c6ce984f04ac6eab0408 authored by Linus Torvalds on 25 April 2014, 23:05:40 UTC, committed by Linus Torvalds on 25 April 2014, 23:05:40 UTC
The mmu-gather operation 'tlb_flush_mmu()' has done two things: the actual tlb flush operation, and the batched freeing of the pages that the TLB entries pointed at. This splits the operation into separate phases, so that the forced batched flushing done by zap_pte_range() can now do the actual TLB flush while still holding the page table lock, but delay the batched freeing of all the pages to after the lock has been dropped. This in turn allows us to avoid a race condition between set_page_dirty() (as called by zap_pte_range() when it finds a dirty shared memory pte) and page_mkclean(): because we now flush all the dirty page data from the TLB's while holding the pte lock, page_mkclean() will be held up walking the (recently cleaned) page tables until after the TLB entries have been flushed from all CPU's. Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Dave Hansen <dave.hansen@intel.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: 1cf35d47712dd5dc4d62c6ce984f04ac6eab0408 authored by Linus Torvalds on 25 April 2014, 23:05:40 UTC
mm: split 'tlb_flush_mmu()' into tlb flushing and memory freeing parts
mm: split 'tlb_flush_mmu()' into tlb flushing and memory freeing parts
Tip revision: 1cf35d4
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block | ||
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include | ||
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lib | ||
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net | ||
samples | ||
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usr | ||
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.gitignore | -rw-r--r-- | 1.1 KB |
.mailmap | -rw-r--r-- | 4.4 KB |
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 93.6 KB |
Kbuild | -rw-r--r-- | 2.5 KB |
Kconfig | -rw-r--r-- | 252 bytes |
MAINTAINERS | -rw-r--r-- | 271.4 KB |
Makefile | -rw-r--r-- | 50.5 KB |
README | -rw-r--r-- | 18.3 KB |
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