Am 23.03.2016 um 15:07 schrieb Brian Foster: > On Wed, Mar 23, 2016 at 02:28:03PM +0100, Stefan Priebe - Profihost AG wrote: >> sorry new one the last one got mangled. Comments inside. >> >> Am 05.03.2016 um 23:48 schrieb Dave Chinner: >>> On Fri, Mar 04, 2016 at 04:03:42PM -0500, Brian Foster wrote: >>>> On Fri, Mar 04, 2016 at 09:02:06PM +0100, Stefan Priebe wrote: >>>>> Am 04.03.2016 um 20:13 schrieb Brian Foster: >>>>>> On Fri, Mar 04, 2016 at 07:47:16PM +0100, Stefan Priebe wrote: >>>>>>> Am 20.02.2016 um 19:02 schrieb Stefan Priebe - Profihost AG: >>>>>>>> >>>>>>>>> Am 20.02.2016 um 15:45 schrieb Brian Foster <bfoster@xxxxxxxxxx>: >>>>>>>>> >>>>>>>>>> On Sat, Feb 20, 2016 at 09:02:28AM +0100, Stefan Priebe wrote: > ... >> >> This has happened again on 8 different hosts in the last 24 hours >> running 4.4.6. >> >> All of those are KVM / Qemu hosts and are doing NO I/O except the normal >> OS stuff as the VMs have remote storage. So no database, no rsync on >> those hosts - just the OS doing nearly nothing. >> >> All those show: >> [153360.287040] WARNING: CPU: 0 PID: 109 at fs/xfs/xfs_aops.c:1234 >> xfs_vm_releasepage+0xe2/0xf0() >> > > Ok, well at this point the warning isn't telling us anything beyond > you're reproducing the problem. We can't really make progress without > more information. We don't necessarily know what application or > operations caused this by the time it occurs, but perhaps knowing what > file is affected could give us a hint. > > We have the xfs_releasepage tracepoint, but that's unconditional and so > might generate a lot of noise by default. Could you enable the > xfs_releasepage tracepoint and hunt for instances where delalloc != 0? > E.g., we could leave a long running 'trace-cmd record -e > "xfs:xfs_releasepage" <cmd>' command on several boxes and wait for the > problem to occur. Alternatively (and maybe easier), run 'trace-cmd start > -e "xfs:xfs_releasepage"' and leave something like 'cat > /sys/kernel/debug/tracing/trace_pipe | grep -v "delalloc 0" > > ~/trace.out' running to capture instances. > > If we can get a tracepoint hit, it will include the inode number and > something like 'find / -inum <ino>' can point us at the file. thanks - need to compile trace-cmd first. Do you know if and how it influences performance? Stefan > > Brian > >> Stefan >> >>> >>> -Dave. >>> >> >> _______________________________________________ >> xfs mailing list >> xfs@xxxxxxxxxxx >> http://oss.sgi.com/mailman/listinfo/xfs -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
