On Tue, 6 May 2014 19:22:43 -0700 (PDT) David Rientjes <[email protected]> wrote:
> Memory compaction works by having a "freeing scanner" scan from one end of a > zone which isolates pages as migration targets while another "migrating > scanner" > scans from the other end of the same zone which isolates pages for migration. > > When page migration fails for an isolated page, the target page is returned > to > the system rather than the freelist built by the freeing scanner. This may > require the freeing scanner to continue scanning memory after suitable > migration > targets have already been returned to the system needlessly. > > This patch returns destination pages to the freeing scanner freelist when > page > migration fails. This prevents unnecessary work done by the freeing scanner > but > also encourages memory to be as compacted as possible at the end of the zone. > > Reported-by: Greg Thelen <[email protected]> What did Greg actually report? IOW, what if any observable problem is being fixed here? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
