Btrfs: Allow worker threads to exit when idle

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The Btrfs worker threads don't currently die off after they have
been idle for a while, leading to a lot of threads sitting around
doing nothing for each mount.

Also, they are unable to start atomically (from end_io hanlders).

This commit reworks the worker threads so they can be started
from end_io handlers (just setting a flag that asks for a thread
to be added at a later date) and so they can exit if they
have been idle for a long time.

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

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This commit is contained in:

Chris Mason 2009-08-04 16:56:34 -04:00

parent ceab36edd3

commit 9042846bc7

3 changed files with 132 additions and 32 deletions

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133

fs/btrfs/async-thread.c

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9

fs/btrfs/async-thread.h

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22

fs/btrfs/disk-io.c

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