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authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2011-05-09 16:45:40 +0100
committerKevin Wolf <kwolf@redhat.com>2011-05-18 14:38:46 +0200
commit6f321e93abb27b4e7ceb228b4204aa304e95daad (patch)
tree91a670fd257f3c412aeca38156112dc557491ce9 /linux-user/uaccess.c
parent5fc09ca5c315b87539db882fba175a7955783530 (diff)
qed: Periodically flush and clear need check bit
One strategy to limit the startup delay of consistency check when opening image files is to ensure that the file is marked dirty for as little time as possible. QED currently marks the image dirty when the first allocating write request is issued and clears the dirty bit again when the image is cleanly closed. In practice that means the image is marked dirty for most of a guest's lifetime and prone to being in a dirty state upon crash or power failure. It is safe to clear the dirty bit after all allocating write requests have completed and a flush has been performed. This patch adds a timer after the last allocating write request completes. When the timer fires it will flush and then clear the dirty bit. The timer is set to 5 seconds and is cancelled upon arrival of a new allocating write request. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'linux-user/uaccess.c')
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