Hi, On Wed, Apr 03, 2002 at 02:40:07PM +0200, Ralf Hildebrandt wrote: > On Wed, Apr 03, 2002 at 02:23:01PM +0200, Diego SANTA CRUZ wrote: > > How is this affected if there are several ext3 filesystems mounted? Can > > all journals be resident in memory at a time? > > The journal is NOT in memory. That's only partially correct. The whole point of the journal is to hold recent write requests before those writes get written back to their permanent backing store locations. As a result, all of the journal writes for a single transaction *are* pinned in memory until the transaction commits --- only after the commit can we start doing the permanent writeback. So, part of the journal will most definitely be in memory during fs activity. The amount of memory pinned is related to the transaction size, though, and not directly to the whole journal size --- we don't ever keep the entire journal in memory. Cheers, Stephen
