"Peter T. Breuer" wrote: > > "Paul Clements wrote:" > > "Peter T. Breuer" wrote: > > > Curiously enough, I'm slightly more nonplussed by the problem of > > > kfreeing the bitmap pages when their dirty count drops to zero. > > > > What should I do? Maintain a how-many-times-we-have-wanted-to-free-this > > > page count and only free it on the 10th attempt? > > > > hmm...perhaps an LRU approach? you could store a timestamp (jiffies?), > > so that you never deallocate a page unless it hasn't been used in X > > amount of time...might be too heavyweight for what you're trying to do > > This is not silly, but is too heavyweight to do each time a bit is set. Yeah, I was thinking of things like an ext3 journal, where you really do not want to _ever_ free the pages. With a simple counter, I don't think there's any way to get that type of behavior. Of course, if you keep a pool of pre-allocated pages, the penalty for deallocation/reallocation becomes a lot lower. -- Paul - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
