git: a02f9685edd1 - main - vm_meter: Add counter for NOFREE pages

The branch main has been updated by bnovkov:

URL: https://cgit.FreeBSD.org/src/commit/?id=a02f9685edd168ef51e2e6fd98f09c9b866fa9a9

commit a02f9685edd168ef51e2e6fd98f09c9b866fa9a9
Author:     Bojan Novković <bnovkov@FreeBSD.org>
AuthorDate: 2024-10-07 14:56:08 +0000
Commit:     Bojan Novković <bnovkov@FreeBSD.org>
CommitDate: 2024-10-07 16:46:32 +0000

    vm_meter: Add counter for NOFREE pages
    
    This change adds a new counter that tracks the total number
    of permanently allocated pages.
    
    Differential Revision:  https://reviews.freebsd.org/D46978
    Reviewed by:    alc, markj
---
 sys/sys/vmmeter.h | 8 ++++++++
 sys/vm/vm_meter.c | 2 ++
 sys/vm/vm_page.c  | 1 +
 3 files changed, 11 insertions(+)

diff --git a/sys/sys/vmmeter.h b/sys/sys/vmmeter.h
index 36321be22205..ac4d2f7e7c90 100644
--- a/sys/sys/vmmeter.h
+++ b/sys/sys/vmmeter.h
@@ -120,6 +120,7 @@ struct vmmeter {
 	counter_u64_t v_rforkpages;	/* (p) pages affected by rfork() */
 	counter_u64_t v_kthreadpages;	/* (p) ... and by kernel fork() */
 	counter_u64_t v_wire_count;	/* (p) pages wired down */
+	counter_u64_t v_nofree_count;	/* (p) permanently allocated pages */
 #define	VM_METER_NCOUNTERS	\
 	(offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t))
 	/*
@@ -174,6 +175,13 @@ vm_wire_count(void)
 	return (VM_CNT_FETCH(v_wire_count));
 }
 
+static inline u_int
+vm_nofree_count(void)
+{
+
+	return (VM_CNT_FETCH(v_nofree_count));
+}
+
 /*
  * Return TRUE if we are under our severe low-free-pages threshold
  *
diff --git a/sys/vm/vm_meter.c b/sys/vm/vm_meter.c
index 7348577fc3cb..faf4074ef0c6 100644
--- a/sys/vm/vm_meter.c
+++ b/sys/vm/vm_meter.c
@@ -90,6 +90,7 @@ struct vmmeter __read_mostly vm_cnt = {
 	.v_rforkpages = EARLY_COUNTER,
 	.v_kthreadpages = EARLY_COUNTER,
 	.v_wire_count = EARLY_COUNTER,
+	.v_nofree_count = EARLY_COUNTER,
 };
 
 u_long __exclusive_cache_line vm_user_wire_count;
@@ -386,6 +387,7 @@ VM_STATS_UINT(v_free_target, "Pages desired free");
 VM_STATS_UINT(v_free_min, "Minimum low-free-pages threshold");
 VM_STATS_PROC(v_free_count, "Free pages", vm_free_count);
 VM_STATS_PROC(v_wire_count, "Wired pages", vm_wire_count);
+VM_STATS_PROC(v_nofree_count, "Permanently allocated pages", vm_nofree_count);
 VM_STATS_PROC(v_active_count, "Active pages", vm_active_count);
 VM_STATS_UINT(v_inactive_target, "Desired inactive pages");
 VM_STATS_PROC(v_inactive_count, "Inactive pages", vm_inactive_count);
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 6256472e0336..67a9c2119ab8 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -2594,6 +2594,7 @@ vm_page_alloc_nofree_domain(int domain, int req)
 	}
 	m = &nqp->ma[nqp->offs++];
 	vm_domain_free_unlock(vmd);
+	VM_CNT_ADD(v_nofree_count, 1);
 
 	return (m);
 }