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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
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
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
@ -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
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
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
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
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
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
large region or tearing down a large address space that has been mlocked via
mlockall(), overall this is a fairly rare event.