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Abstract

In-DRAM Rowhammer defenses pin the mitigation threshold at manufacture time, yet the true Rowhammer Threshold (TRHD) varies with runtime temperature. We propose Dynamic Rowhammer Threshold Management, a defense-agnostic runtime layer that re-sources each defenses threshold from the observed temperature once per epoch via a linear-T model with a VRD-motivated guardband g, projecting the result onto SALT-C, PRAC, and TRR through each defenses threshold parameter. A decoupled oracle that scales physical TRHD per-DIMM by N (1, ) breaks model self-consistency. The layer drives PRACs 72 staleness breaches at 85[] C to zero; at =0.10, sweeping g collapses PRAC breaches from 38.4 (g=1.0) to 9.6 (g=0.9). SALT-C drops from 10 nominal-static breaches to 2 (Dynamic) to 0 (bootstrap), at 5.1% latency. TRR is capacity-limited; the layer acts as a diagnostic.