Ballooning

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memory overcommit

A technique that increases the amount of memory available in a virtual machine environment. Two popular approaches are memory ballooning and kernel same-page merging.

Memory Ballooning
This method allocates unused memory (RAM) from one virtual machine (VM) to another. The term symbolizes an "inflated" balloon temporarily residing in the memory of the VM it was taken from, making that memory unavailable. When the use of that memory is returned to the VM, the balloon is "deflated."

Kernel Same-Page Merging (KSM)
When active memory pages with duplicate content are found, they are merged into one and marked read-only. If an application modifies a merged page, a copy-on-write (CoW) page is created. See copy-on-write and virtual machine.
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Ballooning

See also Aviation.
Balloon Hoax, The
1844 news story falsely reports that eight men have crossed the Atlantic in a balloon. [Am. Lit.: The Balloon Hoax in Poe]
Ferguson, Samuel
embarks with two others on air-borne journey over Africa. [Fr. Lit.: Five Weeks in a Balloon]
Wizard of Oz
reaches and departs from Oz in circus balloon. [Children’s Lit.: The Wonderful Wizard of Oz]
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
6), it did not exceed 22% at the end of the experiment (ballooners: 21.7 [+ or -] 2.89%, n = 13, non-ballooners: 20.0 [+ or -] 8.66%, n = 12, difference not significant, t-test, P = 0.77).
The local persistence of non-emigrants (non-ballooners and short-distance ballooners) in A.
Environmental and logistic factors limited use of more accurate quantitative techniques, but we believe that the Pumice Plain pitfall results give a good approximation of the incoming ballooner fauna, for the following reasons: (1) Local conditions were mostly similar, and microtopographic differences between traps were eliminated by pooling all traps at each site.
In previous ballooner studies, the percentage of Lycosidae among airborne spider specimens has ranged from 3% (Greenstone et al., 1987) to 17% (Glick, 1939).
The VLR fails to resolve ballooners because spiders lack distinctive allometric ratios and tend to have masses near or below the critical threshold for the radar (Chapman et al.