Made get_avail_mem_size also use vmstat.external_page_count so that file-backed pages are considered available.
Made get_avail_mem_size also use vmstat.external_page_count so that file-backed pages are considered available.

pap/rethinkdb,KSanthanam/rethinkdb,sebadiaz/rethinkdb,Qinusty/rethinkdb,bchavez/rethinkdb,grandquista/rethinkdb,jmptrader/rethinkdb,sbusso/rethinkdb,robertjpayne/rethinkdb,greyhwndz/rethinkdb,greyhwndz/rethinkdb,wkennington/rethinkdb,eliangidoni/rethinkdb,victorbriz/rethinkdb,pap/rethinkdb,sbusso/rethinkdb,ayumilong/rethinkdb,catroot/rethinkdb,jmptrader/rethinkdb,urandu/rethinkdb,dparnell/rethinkdb,niieani/rethinkdb,tempbottle/rethinkdb,marshall007/rethinkdb,scripni/rethinkdb,lenstr/rethinkdb,rrampage/rethinkdb,sontek/rethinkdb,wojons/rethinkdb,marshall007/rethinkdb,RubenKelevra/rethinkdb,mquandalle/rethinkdb,wojons/rethinkdb,rrampage/rethinkdb,eliangidoni/rethinkdb,catroot/rethinkdb,wujf/rethinkdb,robertjpayne/rethinkdb,bchavez/rethinkdb,wujf/rethinkdb,bpradipt/rethinkdb,matthaywardwebdesign/rethinkdb,dparnell/rethinkdb,jesseditson/rethinkdb,matthaywardwebdesign/rethinkdb,alash3al/rethinkdb,urandu/rethinkdb,Wilbeibi/rethinkdb,niieani/rethinkdb,JackieXie168/rethinkdb,KSanthanam/rethinkdb,JackieXie168/rethinkdb,robertjpayne/rethinkdb,4talesa/rethinkdb,bpradipt/rethinkdb,Wilbeibi/rethinkdb,mbroadst/rethinkdb,victorbriz/rethinkdb,captainpete/rethinkdb,losywee/rethinkdb,grandquista/rethinkdb,gdi2290/rethinkdb,matthaywardwebdesign/rethinkdb,spblightadv/rethinkdb,wojons/rethinkdb,catroot/rethinkdb,lenstr/rethinkdb,gavioto/rethinkdb,bpradipt/rethinkdb,greyhwndz/rethinkdb,sontek/rethinkdb,gavioto/rethinkdb,4talesa/rethinkdb,yaolinz/rethinkdb,yakovenkodenis/rethinkdb,marshall007/rethinkdb,AntouanK/rethinkdb,robertjpayne/rethinkdb,matthaywardwebdesign/rethinkdb,4talesa/rethinkdb,captainpete/rethinkdb,tempbottle/rethinkdb,ayumilong/rethinkdb,mcanthony/rethinkdb,jesseditson/rethinkdb,lenstr/rethinkdb,yakovenkodenis/rethinkdb,catroot/rethinkdb,jesseditson/rethinkdb,jesseditson/rethinkdb,ayumilong/rethinkdb,catroot/rethinkdb,jesseditson/rethinkdb,wojons/rethinkdb,gavioto/rethinkdb,yakovenkodenis/rethinkdb,rrampage/rethinkdb,scripni/rethinkdb,captainpete/rethinkdb,sbusso/rethinkdb,urandu/rethinkdb,victorbriz/rethinkdb,RubenKelevra/rethinkdb,Qinusty/rethinkdb,rrampage/rethinkdb,Qinusty/rethinkdb,elkingtonmcb/rethinkdb,AntouanK/rethinkdb,sbusso/rethinkdb,victorbriz/rethinkdb,elkingtonmcb/rethinkdb,marshall007/rethinkdb,urandu/rethinkdb,gavioto/rethinkdb,wkennington/rethinkdb,ayumilong/rethinkdb,greyhwndz/rethinkdb,victorbriz/rethinkdb,marshall007/rethinkdb,yaolinz/rethinkdb,JackieXie168/rethinkdb,sbusso/rethinkdb,wkennington/rethinkdb,sebadiaz/rethinkdb,yaolinz/rethinkdb,jmptrader/rethinkdb,dparnell/rethinkdb,AntouanK/rethinkdb,spblightadv/rethinkdb,gdi2290/rethinkdb,jesseditson/rethinkdb,lenstr/rethinkdb,yakovenkodenis/rethinkdb,yakovenkodenis/rethinkdb,losywee/rethinkdb,alash3al/rethinkdb,alash3al/rethinkdb,tempbottle/rethinkdb,urandu/rethinkdb,spblightadv/rethinkdb,wkennington/rethinkdb,grandquista/rethinkdb,yakovenkodenis/rethinkdb,mbroadst/rethinkdb,AntouanK/rethinkdb,sbusso/rethinkdb,alash3al/rethinkdb,jmptrader/rethinkdb,catroot/rethinkdb,grandquista/rethinkdb,mbroadst/rethinkdb,dparnell/rethinkdb,sontek/rethinkdb,ayumilong/rethinkdb,RubenKelevra/rethinkdb,captainpete/rethinkdb,JackieXie168/rethinkdb,Wilbeibi/rethinkdb,losywee/rethinkdb,RubenKelevra/rethinkdb,sontek/rethinkdb,Qinusty/rethinkdb,sebadiaz/rethinkdb,mbroadst/rethinkdb,Qinusty/rethinkdb,spblightadv/rethinkdb,wkennington/rethinkdb,scripni/rethinkdb,JackieXie168/rethinkdb,matthaywardwebdesign/rethinkdb,alash3al/rethinkdb,rrampage/rethinkdb,robertjpayne/rethinkdb,losywee/rethinkdb,wkennington/rethinkdb,KSanthanam/rethinkdb,JackieXie168/rethinkdb,RubenKelevra/rethinkdb,ajose01/rethinkdb,gdi2290/rethinkdb,ajose01/rethinkdb,gdi2290/rethinkdb,AntouanK/rethinkdb,RubenKelevra/rethinkdb,grandquista/rethinkdb,dparnell/rethinkdb,urandu/rethinkdb,sontek/rethinkdb,elkingtonmcb/rethinkdb,captainpete/rethinkdb,scripni/rethinkdb,pap/rethinkdb,matthaywardwebdesign/rethinkdb,ayumilong/rethinkdb,captainpete/rethinkdb,sbusso/rethinkdb,wujf/rethinkdb,wojons/rethinkdb,jesseditson/rethinkdb,tempbottle/rethinkdb,wujf/rethinkdb,JackieXie168/rethinkdb,spblightadv/rethinkdb,elkingtonmcb/rethinkdb,Qinusty/rethinkdb,urandu/rethinkdb,yakovenkodenis/rethinkdb,yakovenkodenis/rethinkdb,grandquista/rethinkdb,greyhwndz/rethinkdb,sontek/rethinkdb,mcanthony/rethinkdb,4talesa/rethinkdb,bchavez/rethinkdb,catroot/rethinkdb,captainpete/rethinkdb,grandquista/rethinkdb,KSanthanam/rethinkdb,KSanthanam/rethinkdb,mquandalle/rethinkdb,sontek/rethinkdb,wujf/rethinkdb,bchavez/rethinkdb,greyhwndz/rethinkdb,scripni/rethinkdb,dparnell/rethinkdb,wojons/rethinkdb,pap/rethinkdb,gavioto/rethinkdb,Qinusty/rethinkdb,mquandalle/rethinkdb,wojons/rethinkdb,tempbottle/rethinkdb,bpradipt/rethinkdb,mcanthony/rethinkdb,grandquista/rethinkdb,gdi2290/rethinkdb,alash3al/rethinkdb,victorbriz/rethinkdb,niieani/rethinkdb,pap/rethinkdb,jesseditson/rethinkdb,Wilbeibi/rethinkdb,jmptrader/rethinkdb,marshall007/rethinkdb,mquandalle/rethinkdb,elkingtonmcb/rethinkdb,tempbottle/rethinkdb,JackieXie168/rethinkdb,wujf/rethinkdb,AntouanK/rethinkdb,victorbriz/rethinkdb,ajose01/rethinkdb,4talesa/rethinkdb,mcanthony/rethinkdb,scripni/rethinkdb,wkennington/rethinkdb,mcanthony/rethinkdb,sebadiaz/rethinkdb,elkingtonmcb/rethinkdb,dparnell/rethinkdb,gdi2290/rethinkdb,mcanthony/rethinkdb,lenstr/rethinkdb,Wilbeibi/rethinkdb,yaolinz/rethinkdb,AntouanK/rethinkdb,spblightadv/rethinkdb,losywee/rethinkdb,bchavez/rethinkdb,matthaywardwebdesign/rethinkdb,greyhwndz/rethinkdb,JackieXie168/rethinkdb,pap/rethinkdb,sebadiaz/rethinkdb,ajose01/rethinkdb,yaolinz/rethinkdb,bpradipt/rethinkdb,rrampage/rethinkdb,spblightadv/rethinkdb,robertjpayne/rethinkdb,mbroadst/rethinkdb,ajose01/rethinkdb,Wilbeibi/rethinkdb,bpradipt/rethinkdb,robertjpayne/rethinkdb,sebadiaz/rethinkdb,niieani/rethinkdb,scripni/rethinkdb,spblightadv/rethinkdb,wojons/rethinkdb,mquandalle/rethinkdb,catroot/rethinkdb,ayumilong/rethinkdb,ajose01/rethinkdb,mcanthony/rethinkdb,RubenKelevra/rethinkdb,rrampage/rethinkdb,elkingtonmcb/rethinkdb,dparnell/rethinkdb,gavioto/rethinkdb,tempbottle/rethinkdb,lenstr/rethinkdb,yaolinz/rethinkdb,greyhwndz/rethinkdb,marshall007/rethinkdb,tempbottle/rethinkdb,bchavez/rethinkdb,alash3al/rethinkdb,wkennington/rethinkdb,KSanthanam/rethinkdb,jmptrader/rethinkdb,bpradipt/rethinkdb,eliangidoni/rethinkdb,sontek/rethinkdb,bpradipt/rethinkdb,gdi2290/rethinkdb,niieani/rethinkdb,ajose01/rethinkdb,scripni/rethinkdb,mquandalle/rethinkdb,gavioto/rethinkdb,4talesa/rethinkdb,eliangidoni/rethinkdb,KSanthanam/rethinkdb,rrampage/rethinkdb,losywee/rethinkdb,bchavez/rethinkdb,urandu/rethinkdb,gavioto/rethinkdb,mbroadst/rethinkdb,AntouanK/rethinkdb,eliangidoni/rethinkdb,bpradipt/rethinkdb,sebadiaz/rethinkdb,mcanthony/rethinkdb,eliangidoni/rethinkdb,lenstr/rethinkdb,niieani/rethinkdb,sebadiaz/rethinkdb,eliangidoni/rethinkdb,mbroadst/rethinkdb,mquandalle/rethinkdb,captainpete/rethinkdb,jmptrader/rethinkdb,ajose01/rethinkdb,eliangidoni/rethinkdb,yaolinz/rethinkdb,grandquista/rethinkdb,sbusso/rethinkdb,losywee/rethinkdb,Wilbeibi/rethinkdb,robertjpayne/rethinkdb,marshall007/rethinkdb,pap/rethinkdb,matthaywardwebdesign/rethinkdb,RubenKelevra/rethinkdb,alash3al/rethinkdb,mquandalle/rethinkdb,wujf/rethinkdb,victorbriz/rethinkdb,pap/rethinkdb,4talesa/rethinkdb,mbroadst/rethinkdb,lenstr/rethinkdb,4talesa/rethinkdb,bchavez/rethinkdb,niieani/rethinkdb,mbroadst/rethinkdb,bchavez/rethinkdb,Qinusty/rethinkdb,dparnell/rethinkdb,losywee/rethinkdb,Qinusty/rethinkdb,robertjpayne/rethinkdb,elkingtonmcb/rethinkdb,yaolinz/rethinkdb,Wilbeibi/rethinkdb,niieani/rethinkdb,KSanthanam/rethinkdb,jmptrader/rethinkdb,eliangidoni/rethinkdb,ayumilong/rethinkdb