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Date: Fri, 16 Nov 2007 10:30:12 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Lee Revell <rlrevell@...-job.com> CC: Stefan Monnier <monnier@....umontreal.ca>, linux-kernel@...r.kernel.org Subject: Re: Treat disk space like memory space Lee Revell wrote: > On Nov 15, 2007 5:24 PM, Stefan Monnier <monnier@....umontreal.ca> wrote: >> [ I realize this is probably better implemented outside of the kernel, but >> it seems like it might be of interest here. Please redirect me to >> a more appropriate place if you can think of one (other than >> /dev/null that is). ] > > It would require some kernel support to reclaim the storage from the > caching application rather than returning -ENOSPC when a "normal" app > needs the storage. Even if you make the caching app free the space by > itself you need a kernel mechanism to signal it when this happens. > In particular, you need a way to hold off the "real" application until disk reclaim is done. If you do it purely in userspace (asynchronously) then it's subject to ENOSPC while the reclaimer runs. This, by the way, has been discussed on and off -- often in the context of undelete (which is an identical problem.) The problem usually is that performance of real storage users suffer because of locality issues. However, flash storage doesn't have locality requirements... -hpa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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