On Mon, Jun 1, 2020 at 12:48 PM Nitin Gupta <nigupta@xxxxxxxxxx> wrote: > > For some applications, we need to allocate almost all memory as > hugepages. However, on a running system, higher-order allocations can > fail if the memory is fragmented. Linux kernel currently does on-demand > compaction as we request more hugepages, but this style of compaction > incurs very high latency. Experiments with one-time full memory > compaction (followed by hugepage allocations) show that kernel is able > to restore a highly fragmented memory state to a fairly compacted memory > state within <1 sec for a 32G system. Such data suggests that a more > proactive compaction can help us allocate a large fraction of memory as > hugepages keeping allocation latencies low. > > Signed-off-by: Nitin Gupta <nigupta@xxxxxxxxxx> > Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx> (+CC Khalid) Can this be pipelined for upstream inclusion now? Sorry, I'm a bit rusty on upstream flow these days. Thanks, Nitin
