Hi, On Sat, 13 Mar 2010 21:49:43 +0100, David Arendt wrote: > Hi, > > In order to reduce cleaner io, I am thinking it could be usefull to > implement a parameter where you can specify the minimum free space. If > this parameter is set, instead of normal cleaning operation, the cleaner > would wait until there is less than minimum free space available and > then run one cleaning pass (from first to last segment). If after that, > there is again more than minimum free space available, continue waiting, > otherwise run cleaning passes until there is more than minimum free > space available. > > What would you think about this idea ? > > Bye, > David Arendt
Well, I think this is one of what cleaner should take in. It can prevent cleanerd from moving in-use blocks too often unless the actual free space is less than the threshold. It may be the first thing to do since it's not difficult in principle. I recognize there are more fundamental defects in the current cleaner: * It moves blocks in selected segments even if all of their blocks are in-use. * It doesn't give priority to reclaiming segments which have many obsolete blocks. * It keeps working without considering io workload of the time. But, I'd rather take a quick fix like your proposal. Regards, Ryusuke Konishi -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
