On Tue, Sep 27, 2016 at 11:50:21AM -0700, Christoph Hellwig wrote: > On Mon, Sep 26, 2016 at 02:52:09PM -0700, Darrick J. Wong wrote: > > The two functions /could/ be merged but I'm hesitant to combine them > > because they run as different workqueue items. > > > > Setting speculative_cow_prealloc_lifetime to a (much) higher value than > > speculative_prealloc_lifetime has been useful for combatting CoW > > fragmentation on VM hosts where the VMs experience bursty write > > behaviors and we can keep the utilization ratios low enough that we > > don't start to run out of space. IOWs, it benefits us to keep the CoW > > fork reservations around for as long as we can unless we run out of > > blocks or hit inode reclaim. > > Ok, so there is a good use case for it. It just felt to me like > there was a little bit too much duplication, that's why I asked. I'll add a brief explanation of this to the patch changelog to record the justification. --D _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
