On Tue, May 06, 2014 at 07:22:45PM -0700, David Rientjes wrote: > Each zone has a cached migration scanner pfn for memory compaction so that > subsequent calls to memory compaction can start where the previous call left > off. > > Currently, the compaction migration scanner only updates the per-zone cached pfn > when pageblocks were not skipped for async compaction. This creates a > dependency on calling sync compaction to avoid having subsequent calls to async > compaction from scanning an enormous amount of non-MOVABLE pageblocks each time > it is called. On large machines, this could be potentially very expensive. > > This patch adds a per-zone cached migration scanner pfn only for async > compaction. It is updated everytime a pageblock has been scanned in its > entirety and when no pages from it were successfully isolated. The cached > migration scanner pfn for sync compaction is updated only when called for sync > compaction. > > Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx> > --- > v3: do not update pageblock skip metadata when skipped due to async per > Vlastimil. Looks good to me. Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>