Author: cem
Date: Thu Sep 26 01:50:26 2019
New Revision: 352733
URL: https://svnweb.freebsd.org/changeset/base/352733
Log:
amd64: Expose vm.pmap.large_map_pml4_entries as a sysctl node
It's nice to have sysctl nodes for tunables.
Sponsored by: Dell EMC Isilon
Modified:
head/sys/amd64/amd64/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Thu Sep 26 01:50:20 2019 (r352732)
+++ head/sys/amd64/amd64/pmap.c Thu Sep 26 01:50:26 2019 (r352733)
@@ -1965,6 +1965,11 @@ pmap_init(void)
}
}
+SYSCTL_UINT(_vm_pmap, OID_AUTO, large_map_pml4_entries,
+ CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &lm_ents, 0,
+ "Maximum number of PML4 entries for use by large map (tunable). "
+ "Each entry corresponds to 512GB of address space.");
+
static SYSCTL_NODE(_vm_pmap, OID_AUTO, pde, CTLFLAG_RD, 0,
"2MB page mapping counters");
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