Delta with Xenon the Linux kernel

What’s up with all that delta?@mcgrof

mcgrof@suse.comLuis R. Rodriguez

http://www.do-not-panic.com

Slides: CC BY-SA Luis R. Rodriguez | Image: CC BY-SA Torkild Retvedt

How big is it?

Citrix: reset two years ago, mostly backportsDebian: 4 microcode patches

SUSE: the largest deltaSLE10: 133 patchesSLE11: 185 patchesSLE12: 110 patches

359,913 lines of codegit://gitorious.org/opensuse/kernel-source.git

patches.xen/Image: CC BY-NC-SA ecololo

Addressing the delta

The xen wiki delta for Linux upstream tracker Luis Rodriguez: IPv6 autoconf, netback

Juergen Gross: pvSCSI, PAT, 500GiB RAMDaniel Kiper: EFI

Konrad Wilk: user mode pvlockBoris Ostrovsky: oprofile support

● Attitude adjustment: work upstream first (™) Is it possible? Future development always upstream

● Backport automatically

Image: CC BY-SA Teza Harinaivo Ramiandrisoa

Needs verificationpci-guestdevmem-hotplughypercall preemption - patch posted, did it go in?multipage ring

Image: CC BY-NC Sergiu Bacioiu

Needs work● pvusb● Expose ballooning limits● Retaining tasklet in netback● Add BLKIF_OP_PACKET, CDROM

command forwarding● CDROM removable media attribute● CDROM avoid takeover in HVM● DCDBAS address translation● Netback multicall for notifications● Interrupt trigger mode and polarity● Logarithmic scale for ballooning

● netfront support skb coalescing● microcode update● MTRR support● Remove VM_IO vestiges● Device hotplug (MODULE_ALIAS)● Suspend event channel support for

faster checkpointing in Remus FT● Expected to be dead code (under

xen) cannot easily be verified to be dead

● Support for old hypervisor (pvops kernel on xen pre-4.0.1 hypervisor)

● blktap driver (what about blktap3?)

Image: CC-BY m4tik