On Jan 11, 2017, at 3:29 AM, Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > > I know there's work on this for xfs, but could this be done in generic mm code? > > What are the obstacles? page->mapping and page->index are the obvious ones. > > If that's too difficult is it maybe enough to share mappings between > files while they are completely identical and clone the mapping when > necessary? > > All COW filesystems would benefit, as well as layered ones: lots of > fuse fs, and in some cases overlayfs too. For layered filesystems it would also be useful to have an API to move pages between mappings easily. > Related: what can DAX do in the presence of cloned block? > > Thanks, > Miklos > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Cheers, Andreas
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