ram_allocation_ratio does not work

we can either:

a) change the calcualtion of free_ram_mb in host state
or
b) store used_ram_mb and total_ram_mb and compute the free_ram in the filter

I think I prefer b)

Might be useful to store the whole compute node record in the HostState.. so filters could potentially use anything from it.

I agree with Chris

Fix proposed to branch: master
Review: https://review.openstack.org/8830

Reviewed: https://review.openstack.org/8830
Committed: http://github.com/openstack/nova/commit/1b40708287808243be27b83791b7d23f8b51b194
Submitter: Jenkins
Branch: master

commit 1b40708287808243be27b83791b7d23f8b51b194
Author: Joe Gordon <email address hidden>
Date: Thu Jun 21 16:41:17 2012 -0700

    Fixes ram_allocation_ratio based over subscription

    Fix for bug 1016273

    Change-Id: I7f7b227e71e93b4bcded150791fb0b9e9df98e4c

Fix proposed to branch: stable/essex
Review: https://review.openstack.org/8954

Reviewed: https://review.openstack.org/8954
Committed: http://github.com/openstack/nova/commit/5d8431b765a991b8cff4c349c3225f532d015b43
Submitter: Jenkins
Branch: stable/essex

commit 5d8431b765a991b8cff4c349c3225f532d015b43
Author: Joe Gordon <email address hidden>
Date: Thu Jun 21 16:41:17 2012 -0700

    Fixes ram_allocation_ratio based over subscription

    Fix for bug 1016273

    Change-Id: I7f7b227e71e93b4bcded150791fb0b9e9df98e4c
    (cherry picked from commit 1b40708287808243be27b83791b7d23f8b51b194)

Please find the attached test log from the Ubuntu Server Team's CI infrastructure. As part of the verification process for this bug, Nova has been deployed and configured across multiple nodes using precise-proposed as an installation source. After successful bring-up and configuration of the cluster, a number of exercises and smoke tests have be invoked to ensure the updated package did not introduce any regressions. A number of test iterations were carried out to catch any possible transient errors.

Please Note the list of installed packages at the top and bottom of the report.

For records of upstream test coverage of this update, please see the Jenkins links in the comments of the relevant upstream code-review(s):

Trunk review: https://review.openstack.org/8830
Stable review: https://review.openstack.org/8954

As per the provisional Micro Release Exception granted to this package by the Technical Board, we hope this contributes toward verification of this update.

Test coverage log.

This bug was fixed in the package nova - 2012.1.3+stable-20120827-4d2a4afe-0ubuntu1

---------------
nova (2012.1.3+stable-20120827-4d2a4afe-0ubuntu1) precise-proposed; urgency=low

  * New upstream snapshot, fixes FTBFS in -proposed. (LP: #1041120)
  * Resynchronize with stable/essex (4d2a4afe):
    - [5d63601] Inappropriate exception handling on kvm live/block migration
      (LP: #917615)
    - [ae280ca] Deleted floating ips can cause instance delete to fail
      (LP: #1038266)

nova (2012.1.3+stable-20120824-86fb7362-0ubuntu1) precise-proposed; urgency=low

  * New upstream snapshot. (LP: #1041120)
  * Dropped, superseded by new snapshot:
    - debian/patches/CVE-2012-3447.patch: [d9577ce]
    - debian/patches/CVE-2012-3371.patch: [25f5bd3]
    - debian/patches/CVE-2012-3360+3361.patch: [b0feaff]
  * Resynchronize with stable/essex (86fb7362):
    - [86fb736] Libvirt driver reports incorrect error when volume-detach fails
      (LP: #1029463)
    - [272b98d] nova delete lxc-instance umounts the wrong rootfs (LP: #971621)
    - [09217ab] Block storage connections are NOT restored on system reboot
      (LP: #1036902)
    - [d9577ce] CVE-2012-3361 not fully addressed (LP: #1031311)
    - [e8ef050] pycrypto is unused and the existing code is potentially insecure
      to use (LP: #1033178)
    - [3b4ac31] cannot umount guestfs (LP: #1013689)
    - [f8255f3] qpid_heartbeat setting in ineffective (LP: #1030430)
    - [413c641] Deallocation of fixed IP occurs before security group refresh
      leading to potential security issue in error / race conditions
      (LP: #1021352)
    - [219c5ca] Race condition in network/deallocate_for_instance() leads to
      security issue (LP: #1021340)
    - [f2bc403] cleanup_file_locks does not remove stale sentinel files
      (LP: #1018586)
    - [4c7d671] Deleting Flavor currently in use by instance creates error
      (LP: #994935)
    - [7e88e39] nova testsuite errors on newer versions of python-boto (e.g.
      2.5.2) (LP: #1027984)
    - [80d3026] NoMoreFloatingIps: Zero floating ips available after repeatedly
      creating and destroying instances over time (LP: #1017418)
    - [4d74631] Launching with source groups under load produces lazy load error
      (LP: #1018721)
    - [08e5128] API 'v1.1/{tenant_id}/os-hosts' does not return a list of hosts
      (LP: #1014925)
    - [801b94a] Restarting nova-compute removes ip packet filters (LP: #1027105)
    - [f6d1f55] instance live migration should create virtual_size disk image
      (LP: #977007)
    - [4b89b4f] [nova][volumes] Exceeding volumes, gigabytes and floating_ips
      quotas returns general uninformative HTTP 500 error (LP: #1021373)
    - [6e873bc] [nova][volumes] Exceeding volumes, gigabytes and floating_ips
      quotas returns general uninformative HTTP 500 error (LP: #1021373)
    - [7b215ed] Use default qemu-img cluster size in libvirt connection driver
    - [d3a87a2] Listing flavors with marker set returns 400 (LP: #956096)
    - [cf6a85a] nova-rootwrap hardcodes paths instead of using
      /sbin:/usr/sbin:/usr/bin:/bin (LP: #1013147)
    - [2efc87c] affinity filters don't work if scheduler_hints is None
      (LP: #1007573)
  ...

The verification of this Stable Release Update has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regresssions.