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mm: Fix typo in unevictable-lru.txt

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Correct spelling "semphore" to "semaphore" in
Documentation/vm/unevictable-lru.txt

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Masanari Iida 2012-02-08 23:22:21 +09:00 committed by Jiri Kosina
parent 42ea19790e
commit 3cd0b6252e
1 changed files with 3 additions and 3 deletions
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6
Documentation/vm/unevictable-lru.txt
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@ -538,7 +538,7 @@ different reverse map mechanisms.
process because mlocked pages are migratable. However, for reclaim, if process because mlocked pages are migratable. However, for reclaim, if
the page is mapped into a VM_LOCKED VMA, the scan stops. the page is mapped into a VM_LOCKED VMA, the scan stops.
try_to_unmap_anon() attempts to acquire in read mode the mmap semphore of try_to_unmap_anon() attempts to acquire in read mode the mmap semaphore of
the mm_struct to which the VMA belongs. If this is successful, it will the mm_struct to which the VMA belongs. If this is successful, it will
mlock the page via mlock_vma_page() - we wouldn't have gotten to mlock the page via mlock_vma_page() - we wouldn't have gotten to
try_to_unmap_anon() if the page were already mlocked - and will return try_to_unmap_anon() if the page were already mlocked - and will return
@ -623,7 +623,7 @@ mapped file pages with an additional argument specifing unlock versus unmap
processing. Again, these functions walk the respective reverse maps looking processing. Again, these functions walk the respective reverse maps looking
for VM_LOCKED VMAs. When such a VMA is found for anonymous pages and file for VM_LOCKED VMAs. When such a VMA is found for anonymous pages and file
pages mapped in linear VMAs, as in the try_to_unmap() case, the functions pages mapped in linear VMAs, as in the try_to_unmap() case, the functions
attempt to acquire the associated mmap semphore, mlock the page via attempt to acquire the associated mmap semaphore, mlock the page via
mlock_vma_page() and return SWAP_MLOCK. This effectively undoes the mlock_vma_page() and return SWAP_MLOCK. This effectively undoes the
pre-clearing of the page's PG_mlocked done by munlock_vma_page. pre-clearing of the page's PG_mlocked done by munlock_vma_page.
@ -641,7 +641,7 @@ with it - the usual fallback position.
Note that try_to_munlock()'s reverse map walk must visit every VMA in a page's Note that try_to_munlock()'s reverse map walk must visit every VMA in a page's
reverse map to determine that a page is NOT mapped into any VM_LOCKED VMA. reverse map to determine that a page is NOT mapped into any VM_LOCKED VMA.
However, the scan can terminate when it encounters a VM_LOCKED VMA and can However, the scan can terminate when it encounters a VM_LOCKED VMA and can
successfully acquire the VMA's mmap semphore for read and mlock the page. successfully acquire the VMA's mmap semaphore for read and mlock the page.
Although try_to_munlock() might be called a great many times when munlocking a Although try_to_munlock() might be called a great many times when munlocking a
large region or tearing down a large address space that has been mlocked via large region or tearing down a large address space that has been mlocked via
mlockall(), overall this is a fairly rare event. mlockall(), overall this is a fairly rare event.