On 7/18/23 14:22, Haitao Huang wrote: > I agree this is the race. But for this to happen, that is at #1 you have > only one non-SECS page left so #3 can happen. That means it is already > high pressure I think our definitions of memory pressure differ. Pressure is raised by allocations and dropped by reclaim. This raise->drop cycle is (or should be) time-limited and can't take forever. The reclaim either works in a short period of time or something dies. If allocations are transient, pressure is transient. Let's say a pressure blip (a one-time event) comes along and pages out that second-to-last page. That's pretty low pressure. Years pass. The enclave never gets run. Nothing pages the second-to-last page back in. A second pressure blip comes along. The SECS page gets paged out. That's two pressure blips in, say 10 years. Is that "high pressure"? > because reclaimer has swapped all other non-SECS. > In my example of two enclaves of 5 non-EPC pages. #3 won't happen > because you don't reach #1 with only one non-SECS left.
