tree a9bb35c110396c9c2a563c9442690cfb3368c8a8
parent 5ac048bb7ea6e87b06504b999017cfa1f38f4092
author Steven Whitehouse <swhiteho@redhat.com> 1301499205 +0100
committer Steven Whitehouse <swhiteho@redhat.com> 1303286388 +0100

GFS2: Alter point of entry to glock lru list for glocks with an address_space

Rather than allowing the glocks to be scheduled for possible
reclaim as soon as they have exited the journal, this patch
delays their entry to the list until the glocks in question
are no longer in use.

This means that we will rely on the vm for writeback of all
dirty data and metadata from now on. When glocks are added
to the lru list they should be freeable much faster since all
the I/O required to free them should have already been completed.

This should lead to much better I/O patterns under low memory
conditions.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>