> Hi > > > How about this? For now, we stop direct reclaim from doing writeback > > only on order zero allocations, but allow it for higher order > > allocations. That will prevent the majority of situations where > > direct reclaim blows the stack and interferes with background > > writeout, but won't cause lumpy reclaim to change behaviour. > > This reduces the scope of impact and hence testing and validation > > the needs to be done. > > Tend to agree. but I would proposed slightly different algorithm for > avoind incorrect oom. > > for high order allocation > allow to use lumpy reclaim and pageout() for both kswapd and direct reclaim > > for low order allocation > - kswapd: always delegate io to flusher thread > - direct reclaim: delegate io to flusher thread only if vm pressure is low > > This seems more safely. I mean Who want see incorrect oom regression? > I've made some pathes for this. I'll post it as another mail. Now, kernel compile and/or backup operation seems keep nr_vmscan_write==0. Dave, can you please try to run your pageout annoying workload? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>