Re: OOM: Better, but still there on

Hi, The system supposes to have special memory reservation for coredump and other debug info when encountering panic, the size seems configurable. Thanks, Xin     Sent: Saturday, December 17, 2016 at 6:44 AM From: "Tetsuo Handa" To: "Nils Holland" , "Michal Hocko" Cc: linux-kernel@vger.kernel.o

Re: page allocation stall in kernel 4.9 when copying files from one btrfs hdd to another

Hi, The dirty data is in large amount, probably unable to commit to disk. And this seems to happen when copying from 7200rpm to 5600rpm disks, according to previous post. Probably the I/Os are buffered and pending, unable to get finished in-time. It might be helpful to know if this only happens

Re: page allocation stall in kernel 4.9 when copying files from one btrfs hdd to another

Hi David, It has GFP_NOFS flags, according to definition, the issue might have happened during initial DISK/IO. By the way, did you get a chance to dump the meminfo and run "top" before the system hang? It seems more info about the system running state needed to know the issue. Thanks. Xin