On Mon, Nov 21, 2016 at 07:43:36AM -0800, Marc MERLIN wrote: > Howdy, > > As a followup to https://plus.google.com/u/0/+MarcMERLIN/posts/A3FrLVo3kc6 > > http://pastebin.com/yJybSHNq and http://pastebin.com/B6xEH4Dw > show a system with plenty of RAM (24GB) falling over and killing inoccent > user space apps, a few hours after I start a 9TB copy between 2 raid5 arrays > both hosting bcache, dmcrypt and btrfs (yes, that's 3 layers under btrfs) > > This kind of stuff worked until 4.6 if I'm not mistaken and started failing > with 4.8 (I didn't try 4.7) > > I tried applying > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9f7e3387939b036faacf4e7f32de7bb92a6635d6 > to 4.8.8 and it didn't help > http://pastebin.com/2LUicF3k My apologies. I'm actually wrong on that one bit. That patch didn't actually apply on my kernel and I didn't end up testing it, due to the failure/revert, it was just another test of the same 4.8.8, so a worthless test. That part of the patch is not compatible with 4.8.8: --- mm/compaction.c +++ mm/compaction.c @@ -1660,7 +1664,8 @@ .classzone_idx = classzone_idx, .direct_compaction = true, .whole_zone = (prio == MIN_COMPACT_PRIORITY), - .ignore_skip_hint = (prio == MIN_COMPACT_PRIORITY) + .ignore_skip_hint = (prio == MIN_COMPACT_PRIORITY), + .ignore_block_suitable = (prio == MIN_COMPACT_PRIORITY) }; INIT_LIST_HEAD(&cc.freepages); INIT_LIST_HEAD(&cc.migratepages); Anyway, for now I'm going to test https://marc.info/?l=linux-mm&m=147423605024993 for real now (on top of 4.8.8) If you'd like me to re-test the compaction patch with 4.8.8, please give me one that is compatible with 4.8.8 but in the meantime, I'll try that 2nd patch on 4.8.8 and report back. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 1024R/763BE901 -- 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>