On Thu, May 27, 2004 at 05:45:50PM +0200, Ivan Voras wrote: > Bernd Walter wrote: > > >>>SU makes perfectly sense for swap backed md drives. > >> > >>I always thought the "swap backed" meant the memory is allocated from the > >>same pool as for userland applications, e.g. they only get swapped out if > >>memory is scarce. Is this wrong? > > > > > >You are right, but md(4) doesn't know about the filesystem and therefor > >can't know which blocks have content to keep and which are unused. > >SU now allows files that are deleted quite fast to never touch the > >block device and md never need to write those blocks into swap storage > >as they never got dirty. > > As opposed to the 'async' mode? I think all async mode files get writen sooner or later even if already deleted, but I'm not shure. -- B.Walter BWCT http://www.bwct.de bernd_at_bwct.de info_at_bwct.deReceived on Thu May 27 2004 - 14:21:50 UTC
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