[Announce] Kernel RHEL6 testing 042stab080.7

[Kir Kolyshkin]

OpenVZ project released an updated RHEL6 based testing kernel. Read 
below for more information.

NOTE that this is a *testing* kernel, not yet recommended for production.


Changes
=======
(from 042stab079.4 kernel, not from 042stab080.3)
* [fs] limit writeback triggered by fadvise to the specified range 
should improve the performance
* [ext4] when writeback is done in context, which is followed by 
sync_fs, skip forced commit in ext4_write_inode, it will be done once. 
Again the performance should be improved. This feature can be disabled 
by "echo 0 > /sys/fs/ext4/batch_sync"
* [stat] replaces global counters with per-cpu structures to avoid 
kstat_glb_lock congestion => performance increases
* [nfs/quota] NFS local quota (vzquota in case /vz over NFS) 
significantly reworked => no more crashes / stats skews are expected 
(PCLIN-31747)
* [ploop] kaio must merge bios for aio_kernel_submit => should avoid 
problem with massive 4k FUSE requests (PSBM-19207)
* [perf] perf events syscall are forbidden now in Containers by default 
because they are very complicated and potentially vulnerable (use sysctl 
kernel.perf_event_paranoid = -1 to enable)
* [drv/video/r600] kernel WARNING is substituted with printk() in order 
not to taint the kernel for nothing (PSBM-21043)
* [mm/compaction] repair should_continue_reclaim logic, this fixes the 
memory reclaimer under high load (PSBM-20273)
* [vfs] kernel panic when accessing usb storage device has been fixed 
(PSBM-21015)
* [vfs] kernel warning (and thus taint) by __mark_inode_dirty() function 
for /dev/zero has been fixed (PSBM-21206)
* [signal] signal pending flag could be lost due to a race between 
non-atomic bit-reset and set_tsk_thread_flag() (PCLIN-31992)
* [cpt] kernel panic after online migration could happen on destination 
node due to incorrect packets with SKB_GSO_TCP flag set drop. We can 
drop only packets with SKB_GSO_UDP, if we cannot dump a packet with 
SKB_GSO_TCP, need to abort the migration. (PSBM-21181)
* [vzquota] vzquota was mistakenly considered locked (after major 
vzquota rework in previous 080.x kernels) (PCLIN-32009)


Download
========
http://wiki.openvz.org/Download/kernel/rhel6-testing/042stab080.7


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