On Tue, Sep 04, 2012 at 06:57:14AM -0400, Christoph Hellwig wrote: > On Tue, Sep 04, 2012 at 06:17:47PM +0800, Li Wang wrote: > > For file system created on file-backed loop device, there will be > > two-levels of > > page cache present, which typically doubles the memory consumption. > > And the right fix is to not use buffer I/O on the backing file instead > of hacks like this.
That was my initial reaction too, but for the case of two VMs operating on the same device, it's better for it to be cached once in the hype-rvisor than twice in the VMs. Is that a common case worth optimising for? Probably not ... -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
