Btrfs: Reduce contention on the root node

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This calls unlock_up sooner in btrfs_search_slot in order to decrease the
amount of work done with the higher level tree locks held.

Also, it changes btrfs_tree_lock to spin for a big against the page lock
before scheduling.  This makes a big difference in context switch rate under
highly contended workloads.

Longer term, a better locking structure is needed than the page lock.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Chris Mason 2008-06-25 16:14:04 -04:00

parent 3f157a2fd2

commit f9efa9c784

2 changed files with 21 additions and 6 deletions

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17

fs/btrfs/ctree.c

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10

fs/btrfs/locking.c

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