Tfa even bolds the initial takeaway: "Swap is primarily a mechanism for equality of reclamation, not for emergency "extra memory". Swap is not what makes your a

Tfa even bolds the initial takeaway: "Swap is primarily a mechanism for equality of reclamation, not for emergency "extra memory". Swap is not what makes your application slow – entering overall memory contention is what makes your application slow." It is a mechanism for making more page types reclaimable.