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xfs: restore allocation trylock iteration
It was accidentally dropped when refactoring the allocation code, resulting in the AG iteration always doing blocking AG iteration. This results in a small performance regression for a specific fsmark test that runs more user data writer threads than there are AGs. Reported-by: kernel test robot <oliver.sang@intel.com> Fixes: 2edf06a ("xfs: factor xfs_alloc_vextent_this_ag() for _iterate_ags()") Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
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