TPEPerformance/128MB

Enable B2G to run on 128MB memory devices

• Thrashing (GC <--> zRAM)
  • do experiments for proving
  • Solutions
    • stop GC
    • GC before switching to background
      • stop GC for memory pressure of background process.
  • Facts
    • memory pressure trigger GC, it brings pages from zRAM.
    • GC and memory minimize are called for switching to background.

<bugzilla> {

"id": "944659,945166,945161,945152,945174,945185,854795,957509,951601,963477,962987,964599,951531,939056,938470,961348,959966,956215,960894,962444,962384"

} </bugzilla>