Linux Plumbers Conf 2013

One Line Summary

Abstract

QEMU is looking to use vmsplice to move pages from one process to another. QEMU will use this to move a VM to an updated QEMU executable (security fix) with minimal downtime. This approach flips pages without copying but as it uses pipe buffers it operates on 4K (or base PAGE_SIZE) pages only.

I would like to discuss solutions to improve this page flipping where one possible option is to change pipe buffers to support transparent huge pages.

Speaker

• 

  Robert Jennings

  IBM
  • Favorites: View Robert's favorites

  Biography

  Rob is a Linux kernel developer in IBM’s Linux Technology Center based in Austin, TX. He has been working on operating systems for over 12 years and the Linux kernel for 9 years in the areas of networking, SCSI, memory hot-plug, hibernation, live-migration, and powerpc virtualization.

  Sessions

  • * vmsplice with transparent huge pages
    • Title: vmsplice with transparent huge pages
    • Microconference: Scaling
    • Time: 4:10pm
    • One Line Summary:

      vmsplice() could move (rather can copy) pages between processes, but performance would be greatly improved if this supported THP.

    • Speakers: Robert Jennings