randomx: optional 2 MB large pages for the cache, dataset and scratchpads

RandomX reads its 256 MB cache, 2 GB dataset and per-VM scratchpads at random,
so most accesses miss the TLB on 4 KB pages. Requesting 2 MB pages recovers
roughly a tenth of the hash rate. Each allocation tries large pages first and
falls back to normal pages when the pool is not reserved, so nothing regresses
when hugepages are unavailable. -nolargepages opts out, and the diagnostics
report which allocations got large pages.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/net.cpp b/src/net.cpp
index ecfd565..287a4bd 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -366,6 +366,7 @@ string GetDiagnosticsText()
                                      nMining,
                                      (RandomXFastReady() ? 2080 : 256) + 2 * nMining).c_str()
                          : ", not mining");
+    str += strprintf("  large pages       %s\n", RandomXLargePagesStatus());
 
     str += SockAccountingText();