Just double check, what is your kernel version to trigger this problem… I suppose this should be an older kernel? If yes, can you have a try at the latest upstream kernel and see if problem still exist? Thanks, Wang > > 在 2014-1-13，下午11:20，Jim Salter <jim@xxxxxxxxx> 写道： > >> Er... I can't use incremental send if I can't get one full send to go through first. =) > > sory, i mean one approach is use '-p' option, you can use: > > # btrfs sub create subv > # btrfs sub snapshot -r subv snap > # btrfs sub snapshot -r sub snap1 > # btrfs send snap -p snap1 -f 1 > # btrfs receive -f 1 backup > # btrfs sub delete snap1 -<-- now you can delete snap1 safely > > The above approach is much faster, i think you can try it! > > Thanks, > Wang >> >> I'm hoping the problem will go away for long enough to get a full send completed once I reboot the box, but I can't do that until (much) later in the day. >> >> On 01/13/2014 10:17 AM, Wang Shilong wrote: >>> Hello, >>> >>> I took a careful think about your problems below, i think this is because btrfs *ulist* implement use >>> krealloc which might cause memory allocation fails especial you use full send. >>> >>> Before we kicked off now stupid *ulist* implements, i think you can use incremental send to solve >>> this issue. >>> >>> Thanks, >>> Wang >>> >>>> Hi list - >>>> >>>> Getting sporadic page allocation failures in btrfs send. This happened once several weeks ago but was fine after a reboot; yesterday I did not reboot, but had the failure back-to-back trying to send two different snapshots. These are full sends, not incremental, of a bit over 600G of data. Test machine has 32G of RAM, with 21G of it free (not including cache): >>>> >>>> root@gwa-virt1:/data/images/.snapshots# free -m >>>> total used free shared buffers cached >>>> Mem: 32159 31789 369 0 0 21276 >>>> -/+ buffers/cache: 10513 21646 >>>> Swap: 0 0 0 >>>> >>>> In both cases (all three, really) the btrfs send failed a bit more than half of the way through the send (somewhere around the 380GB mark). >>>> >>>> Kern log snippets follow: >>>> >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627611] btrfs: page allocation failure: order:6, mode:0x104050 >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627622] CPU: 6 PID: 9642 Comm: btrfs Not tainted 3.13.0-031300rc7-generic #201401041835 >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627773] [<ffffffffa0142214>] ? btrfs_get_token_64+0x64/0xf0 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627818] [<ffffffffa01876dd>] ? ulist_add_merge+0xcd/0x270 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627860] [<ffffffffa01876dd>] ulist_add_merge+0xcd/0x270 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627894] [<ffffffffa018615c>] find_parent_nodes+0x50c/0x6f0 [btrf ] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627930] [<ffffffffa018e550>] ? compare_refs.isra.23+0x130/0x130 btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.627965] [<ffffffffa0187019>] iterate_extent_inodes+0xf9/0x270 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628003] [<ffffffffa014b7a5>] ? free_extent_buffer+0x35/0x40 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628037] [<ffffffffa018dc9d>] find_extent_clone.isra.26+0x26d/0x340 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628072] [<ffffffffa0191207>] process_extent+0xd7/0x180 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628107] [<ffffffffa01918ff>] changed_cb+0xdf/0x170 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628141] [<ffffffffa0191ad2>] full_send_tree+0x142/0x280 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628174] [<ffffffffa0191ccc>] ? send_subvol_begin+0xbc/0x2b0 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628209] [<ffffffffa0191fa0>] send_subvol+0xe0/0xf0 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628244] [<ffffffffa01922f1>] btrfs_ioctl_send+0x341/0x520 [btrfs] >>>> Jan 12 14:05:36 gwa-virt1 kernel: [535523.628279] [<ffffffffa01606d3>] btrfs_ioctl+0x953/0xac0 [btrfs] >>>> >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016512] btrfs: page allocation failure: order:5, mode:0x104050 >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016518] CPU: 4 PID: 18689 Comm: btrfs Not tainted 3.13.0-031300rc7-generic #201401041835 >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016597] [<ffffffffa0142214>] ? btrfs_get_token_64+0x64/0xf0 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016617] [<ffffffffa01876dd>] ? ulist_add_merge+0xcd/0x270 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016637] [<ffffffffa01876dd>] ulist_add_merge+0xcd/0x270 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016653] [<ffffffffa018615c>] find_parent_nodes+0x50c/0x6f0 [btrf ] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016669] [<ffffffffa018e550>] ? compare_refs.isra.23+0x130/0x130 btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016684] [<ffffffffa0187019>] iterate_extent_inodes+0xf9/0x270 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016700] [<ffffffffa014b7a5>] ? free_extent_buffer+0x35/0x40 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016716] [<ffffffffa018dc9d>] find_extent_clone.isra.26+0x26d/0x340 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016732] [<ffffffffa0191207>] process_extent+0xd7/0x180 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016747] [<ffffffffa01918ff>] changed_cb+0xdf/0x170 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016763] [<ffffffffa0191ad2>] full_send_tree+0x142/0x280 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016778] [<ffffffffa0191ccc>] ? send_subvol_begin+0xbc/0x2b0 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016794] [<ffffffffa0191fa0>] send_subvol+0xe0/0xf0 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016810] [<ffffffffa01922f1>] btrfs_ioctl_send+0x341/0x520 [btrfs] >>>> Jan 12 21:34:00 gwa-virt1 kernel: [562448.016826] [<ffffffffa01606d3>] btrfs_ioctl+0x953/0xac0 [btrfs] >>>> >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >>>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
