Author: andrew
Date: Mon Aug 22 12:17:40 2016
New Revision: 304599
URL: https://svnweb.freebsd.org/changeset/base/304599
Log:
Add sysctls to report on superpages statistics. While here add extra
logging to these paths.
Obtained from: ABT Systems Ltd
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/arm64/arm64/pmap.c
Modified: head/sys/arm64/arm64/pmap.c
==============================================================================
--- head/sys/arm64/arm64/pmap.c Mon Aug 22 10:50:30 2016 (r304598)
+++ head/sys/arm64/arm64/pmap.c Mon Aug 22 12:17:40 2016 (r304599)
@@ -874,6 +874,21 @@ pmap_init(void)
rw_init(&pv_list_locks[i], "pmap pv list");
}
+static SYSCTL_NODE(_vm_pmap, OID_AUTO, l2, CTLFLAG_RD, 0,
+ "2MB page mapping counters");
+
+static u_long pmap_l2_demotions;
+SYSCTL_ULONG(_vm_pmap_l2, OID_AUTO, demotions, CTLFLAG_RD,
+ &pmap_l2_demotions, 0, "2MB page demotions");
+
+static u_long pmap_l2_p_failures;
+SYSCTL_ULONG(_vm_pmap_l2, OID_AUTO, p_failures, CTLFLAG_RD,
+ &pmap_l2_p_failures, 0, "2MB page promotion failures");
+
+static u_long pmap_l2_promotions;
+SYSCTL_ULONG(_vm_pmap_l2, OID_AUTO, promotions, CTLFLAG_RD,
+ &pmap_l2_promotions, 0, "2MB page promotions");
+
/*
* Invalidate a single TLB entry.
*/
@@ -2309,14 +2324,22 @@ pmap_promote_l2(pmap_t pmap, pd_entry_t
return;
/* Check the alingment is valid */
- if (((newl2 & ~ATTR_MASK) & L2_OFFSET) != 0)
+ if (((newl2 & ~ATTR_MASK) & L2_OFFSET) != 0) {
+ atomic_add_long(&pmap_l2_p_failures, 1);
+ CTR2(KTR_PMAP, "pmap_promote_l2: failure for va %#lx"
+ " in pmap %p", va, pmap);
return;
+ }
pa = newl2 + L2_SIZE - PAGE_SIZE;
for (l3 = firstl3 + NL3PG - 1; l3 > firstl3; l3--) {
oldl3 = pmap_load(l3);
- if (oldl3 != pa)
+ if (oldl3 != pa) {
+ atomic_add_long(&pmap_l2_p_failures, 1);
+ CTR2(KTR_PMAP, "pmap_promote_l2: failure for va %#lx"
+ " in pmap %p", va, pmap);
return;
+ }
pa -= PAGE_SIZE;
}
@@ -2324,6 +2347,8 @@ pmap_promote_l2(pmap_t pmap, pd_entry_t
newl2 |= L2_BLOCK;
pmap_update_entry(pmap, l2, newl2, sva, L2_SIZE);
+
+ atomic_add_long(&pmap_l2_promotions, 1);
}
/*
@@ -3745,6 +3770,10 @@ pmap_demote_l2_locked(pmap_t pmap, pt_en
pmap_update_entry(pmap, l2, l3phys | L2_TABLE, va, PAGE_SIZE);
+ atomic_add_long(&pmap_l2_demotions, 1);
+ CTR3(KTR_PMAP, "pmap_demote_l2: success for va %#lx"
+ " in pmap %p %lx", va, pmap, l3[0]);
+
if (tmpl2 != 0) {
pmap_kremove(tmpl2);
kva_free(tmpl2, PAGE_SIZE);
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