[Announce] Kernel RHEL6 testing 042stab056.8

[Kir Kolyshkin]

OpenVZ project has released a new RHEL6 based kernel. Read below for 
more information.
Everyone using this kernel branch is advised to upgrade.

Changes
=======
(since 042stab056.5):
[cfq] kernel BUG at block/cfq-iosched.c:386 has been fixed (PCLIN-30890)
[fuse] added possibility to disable fuse O_DIRECT with help of 
fs.fuse_ext_caps sysctl (enabled by default) (debug for PSBM-13075)
[fuse] flush writeback data on file close. In particular this fixes 
checkpointing (PSBM-13226)
[fuse] several other bugfixes
[quota] remounting of FS with quota on ploop could crash host (PSBM-13231)
[fs/writeback] writeback writer throttler algorithm has been enhanced
[mount namespaces] mount namespaces support for has been added. This is 
required for Fedora 17 (PSBM-13004). Note: online migration support has 
not been added yet
[cpt] kernel BUG at kernel/cpt/rst_socket.c:407 (on a self-connected 
socket restore) fixed (PSBM-13367)
[cpt] sleep-in-atomic at dumping cgroup has been fixes (PSBM-13297)
[cpt] timerfs irq-safe locking has been fixed
[cpt] false positive error messages "_rst_get_object: wrong object type" 
has been fixed (PSBM-13303)
[fuse] "fs.fuse_ext_caps" sysctl has been removed. Now we need to 
provide fuse mount options to enable features:
"writeback_enable" mount option to enable writeback for fuse mount
"direct_enable" mount option to enable direct IO for fuse mount
[fuse] show writeback and dio options in proc
[fuse] file release should make sure writeback is finished
[iov_iter] direct_IO_page interface has been added. Required for 
efficient fuse io_kaio (PSBM-12830)
[oom] oom reports now the current fuse writeback pages counter
[time] CT uptime is calculated incorrectly in cases like host suspend 
(PCLIN-30011)
[fairsched] accuracy of idle/iowait time stats reported through 
/proc/stat has been increased (PCLIN-30724)
[fairsched] context switch latency on an almost idle node has been 
significantly decreased (PSBM-11477)
[ploop] support for 'expanded' format to io_kaio, support for snapshot, 
merge and pcopy (migrate) operations has been added (PSBM-12830)
[ploop] we support only ploop over NFS v3 => ploop mount over NFSv4 has 
been prohibited (PSBM-13376)
[ploop] ploop balloon discard could ignore errors and hang (PSBM-13290)
[ovs/ipv6] kernel ABI has been restored, hypervisor modules should 
compile fine now (PSBM-13383)
[ploop] disable ENOSPC checks for preallocated and raw images
[blkcg] allocate per-cpu statistics from worker thread
[ipv6] change neighbour table hash for ipv6


Compatibility
=============
No new issues


Download
========
http://wiki.openvz.org/Download/kernel/rhel6-testing/042stab056.8


Bug reporting
=============
Use http://bugzilla.openvz.org/  to report any bugs found.


Other sources of info on updates
================================
See http://wiki.openvz.org/News  to view all the news (including updates)
online. There you can also find RSS/Atom feed links.


Best regards,
      OpenVZ team.