Btrfs: fix prealloc under heavy fragmentation conditions

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If we are heavily fragmented we will continually try to prealloc the largest
extent size we can every time we call btrfs_reserve_extent.  This can be very
expensive when we are heavily fragmented, burning lots of CPU cycles and loops
through the allocator.  So instead notice when we get a smaller chunk from the
allocator than what we specified and use this as the new maximum size we try to
allocate.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

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Josef Bacik 2015-09-23 17:11:16 -04:00 • committed by Chris Mason

parent d0bd456074

commit 0b670dc44c

1 changed files with 9 additions and 0 deletions

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fs/btrfs/inode.c

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