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diff --git a/sys/conf/options.riscv b/sys/conf/options.riscv
--- a/sys/conf/options.riscv
+++ b/sys/conf/options.riscv
@@ -1,3 +1,3 @@
-
RISCV opt_global.h # For cpu RISCV to work
INTRNG opt_global.h
+PV_STATS opt_pmap.h
diff --git a/sys/riscv/conf/NOTES b/sys/riscv/conf/NOTES
--- a/sys/riscv/conf/NOTES
+++ b/sys/riscv/conf/NOTES
@@ -17,6 +17,9 @@
options DDB_CTF # Kernel ELF linker loads CTF data
options RACCT_DEFAULT_TO_DISABLED # Set kern.racct.enable=0 by default
+# Enable detailed accounting by the PV entry allocator.
+options PV_STATS
+
# RISC-V SBI console
device rcons
diff --git a/sys/riscv/riscv/pmap.c b/sys/riscv/riscv/pmap.c
--- a/sys/riscv/riscv/pmap.c
+++ b/sys/riscv/riscv/pmap.c
@@ -93,7 +93,6 @@
* SUCH DAMAGE.
*/
-#include <sys/cdefs.h>
/*
* Manages physical address maps.
*
@@ -113,6 +112,8 @@
* and to when physical maps must be made correct.
*/
+#include "opt_pmap.h"
+
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bitstring.h>
@@ -1891,7 +1892,6 @@
[_NPCM - 1] = PC_FREEL
};
-#if 0
#ifdef PV_STATS
static int pc_chunk_count, pc_chunk_allocs, pc_chunk_frees, pc_chunk_tryfail;
@@ -1916,7 +1916,6 @@
SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_spare, CTLFLAG_RD, &pv_entry_spare, 0,
"Current number of spare pv entries");
#endif
-#endif /* 0 */
/*
* We are in a serious low memory condition. Resort to
@@ -2101,7 +2100,8 @@
goto retry;
reclaimed = true;
}
- /* XXX PV STATS */
+ PV_STAT(atomic_add_int(&pc_chunk_count, 1));
+ PV_STAT(atomic_add_int(&pc_chunk_allocs, 1));
#if 0
dump_add_page(m->phys_addr);
#endif
@@ -2112,6 +2112,7 @@
pc->pc_map[2] = PC_FREEL;
TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
TAILQ_INSERT_TAIL(&new_tail, pc, pc_lru);
+ PV_STAT(atomic_add_int(&pv_entry_spare, _NPCPV));
/*
* The reclaim might have freed a chunk from the current pmap.
@@ -2222,6 +2223,7 @@
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_next);
m->md.pv_gen++;
/* Instantiate the remaining 511 pv entries. */
+ PV_STAT(atomic_add_long(&pv_entry_allocs, Ln_ENTRIES - 1));
va_last = va + L2_SIZE - PAGE_SIZE;
for (;;) {
pc = TAILQ_FIRST(&pmap->pm_pvchunk);
@@ -2250,7 +2252,8 @@
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc, pc_list);
}
- /* XXX PV stats */
+ PV_STAT(atomic_add_long(&pv_entry_count, Ln_ENTRIES - 1));
+ PV_STAT(atomic_add_int(&pv_entry_spare, -(Ln_ENTRIES - 1)));
}
#if VM_NRESERVLEVEL > 0

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