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ocfs2: Local alloc window size changeable via mount option

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Local alloc is a performance optimization in ocfs2 in which a node
takes a window of bits from the global bitmap and then uses that for
all small local allocations. This window size is fixed to 8MB currently.
This patch allows users to specify the window size in MB including
disabling it by passing in 0. If the number specified is too large,
the fs will use the default value of 8MB.

mount -o localalloc=X /dev/sdX /mntpoint

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Sunil Mushran
2007-12-20 14:58:11 -08:00
committed by Mark Fasheh
parent d147b3d630
commit 2fbe8d1ebe
6 changed files with 62 additions and 14 deletions
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Documentation/filesystems/ocfs2.txt
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@@ -72,3 +72,6 @@ commit=nrsec (*) Ocfs2 can be told to sync all its data and metadata
it at the default (5 seconds).
Setting it to very large values will improve
performance.
localalloc=8(*) Allows custom localalloc size in MB. If the value is too
large, the fs will silently revert it to the default.
Localalloc is not enabled for local mounts.