[Qemu-commits] [qemu/qemu] cdd7ab: iothread: enable AioContext polling by default

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: cdd7abfdba9287a289c404dfdcb02316f9ffee7d
      
https://github.com/qemu/qemu/commit/cdd7abfdba9287a289c404dfdcb02316f9ffee7d
  Author: Stefan Hajnoczi <address@hidden>
  Date:   2017-02-03 (Fri, 03 Feb 2017)

  Changed paths:
    M iothread.c

  Log Message:
  -----------
  iothread: enable AioContext polling by default

IOThread AioContexts are likely to consist only of event sources like
virtqueue ioeventfds and LinuxAIO completion eventfds that are pollable
from userspace (without system calls).

We recently merged the AioContext polling feature but didn't enable it
by default yet.  I have gone back over the performance data on the
mailing list and picked a default polling value that gave good results.

Let's enable AioContext polling by default so users don't have another
switch they need to set manually.  If performance regressions are found
we can still disable this for the QEMU 2.9 release.

Cc: Paolo Bonzini <address@hidden>
Cc: Christian Borntraeger <address@hidden>
Cc: Karl Rister <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
Message-id: address@hidden
Signed-off-by: Stefan Hajnoczi <address@hidden>


  Commit: a951316b8a5c3c63254f20a826afeed940dd4cba
      
https://github.com/qemu/qemu/commit/a951316b8a5c3c63254f20a826afeed940dd4cba
  Author: Peter Maydell <address@hidden>
  Date:   2017-02-03 (Fri, 03 Feb 2017)

  Changed paths:
    M iothread.c

  Log Message:
  -----------
  Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into 
staging

# gpg: Signature made Fri 03 Feb 2017 14:37:45 GMT
# gpg:                using RSA key 0x9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <address@hidden>"
# gpg:                 aka "Stefan Hajnoczi <address@hidden>"
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/block-pull-request:
  iothread: enable AioContext polling by default

Signed-off-by: Peter Maydell <address@hidden>


Compare: https://github.com/qemu/qemu/compare/4100a344eb3d...a951316b8a5c