svn commit: r332771 - head/sys/vm
Mark Johnston
markj at FreeBSD.org
Thu Apr 19 14:09:46 UTC 2018
Author: markj
Date: Thu Apr 19 14:09:44 2018
New Revision: 332771
URL: https://svnweb.freebsd.org/changeset/base/332771
Log:
Initialize marker pages in vm_page_domain_init().
They were previously initialized by the corresponding page daemon
threads, but for vmd_inacthead this may be too late if
vm_page_deactivate_noreuse() is called during boot.
Reported and tested by: cperciva
Reviewed by: alc, kib
MFC after: 1 week
Modified:
head/sys/vm/vm_page.c
head/sys/vm/vm_page.h
head/sys/vm/vm_pageout.c
head/sys/vm/vm_pagequeue.h
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Thu Apr 19 13:37:59 2018 (r332770)
+++ head/sys/vm/vm_page.c Thu Apr 19 14:09:44 2018 (r332771)
@@ -437,6 +437,23 @@ sysctl_vm_page_blacklist(SYSCTL_HANDLER_ARGS)
return (error);
}
+/*
+ * Initialize a dummy page for use in scans of the specified paging queue.
+ * In principle, this function only needs to set the flag PG_MARKER.
+ * Nonetheless, it write busies and initializes the hold count to one as
+ * safety precautions.
+ */
+void
+vm_page_init_marker(vm_page_t marker, int queue)
+{
+
+ bzero(marker, sizeof(*marker));
+ marker->flags = PG_MARKER;
+ marker->busy_lock = VPB_SINGLE_EXCLUSIVER;
+ marker->queue = queue;
+ marker->hold_count = 1;
+}
+
static void
vm_page_domain_init(int domain)
{
@@ -464,9 +481,13 @@ vm_page_domain_init(int domain)
TAILQ_INIT(&pq->pq_pl);
mtx_init(&pq->pq_mutex, pq->pq_name, "vm pagequeue",
MTX_DEF | MTX_DUPOK);
+ vm_page_init_marker(&vmd->vmd_markers[i], i);
}
mtx_init(&vmd->vmd_free_mtx, "vm page free queue", NULL, MTX_DEF);
mtx_init(&vmd->vmd_pageout_mtx, "vm pageout lock", NULL, MTX_DEF);
+ vm_page_init_marker(&vmd->vmd_inacthead, PQ_INACTIVE);
+ TAILQ_INSERT_HEAD(&vmd->vmd_pagequeues[PQ_INACTIVE].pq_pl,
+ &vmd->vmd_inacthead, plinks.q);
snprintf(vmd->vmd_name, sizeof(vmd->vmd_name), "%d", domain);
}
Modified: head/sys/vm/vm_page.h
==============================================================================
--- head/sys/vm/vm_page.h Thu Apr 19 13:37:59 2018 (r332770)
+++ head/sys/vm/vm_page.h Thu Apr 19 14:09:44 2018 (r332771)
@@ -490,6 +490,7 @@ void vm_page_free_phys_pglist(struct pglist *tq);
bool vm_page_free_prep(vm_page_t m, bool pagequeue_locked);
vm_page_t vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr);
void vm_page_initfake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
+void vm_page_init_marker(vm_page_t m, int queue);
int vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t);
void vm_page_launder(vm_page_t m);
vm_page_t vm_page_lookup (vm_object_t, vm_pindex_t);
Modified: head/sys/vm/vm_pageout.c
==============================================================================
--- head/sys/vm/vm_pageout.c Thu Apr 19 13:37:59 2018 (r332770)
+++ head/sys/vm/vm_pageout.c Thu Apr 19 14:09:44 2018 (r332771)
@@ -208,23 +208,6 @@ static void vm_pageout_laundry_worker(void *arg);
static boolean_t vm_pageout_page_lock(vm_page_t, vm_page_t *);
/*
- * Initialize a dummy page for marking the caller's place in the specified
- * paging queue. In principle, this function only needs to set the flag
- * PG_MARKER. Nonetheless, it write busies and initializes the hold count
- * to one as safety precautions.
- */
-static void
-vm_pageout_init_marker(vm_page_t marker, u_short queue)
-{
-
- bzero(marker, sizeof(*marker));
- marker->flags = PG_MARKER;
- marker->busy_lock = VPB_SINGLE_EXCLUSIVER;
- marker->queue = queue;
- marker->hold_count = 1;
-}
-
-/*
* vm_pageout_fallback_object_lock:
*
* Lock vm object currently associated with `m'. VM_OBJECT_TRYWLOCK is
@@ -244,11 +227,11 @@ vm_pageout_fallback_object_lock(vm_page_t m, vm_page_t
struct vm_page marker;
struct vm_pagequeue *pq;
boolean_t unchanged;
- u_short queue;
vm_object_t object;
+ int queue;
queue = m->queue;
- vm_pageout_init_marker(&marker, queue);
+ vm_page_init_marker(&marker, queue);
pq = vm_page_pagequeue(m);
object = m->object;
@@ -293,14 +276,14 @@ vm_pageout_page_lock(vm_page_t m, vm_page_t *next)
struct vm_page marker;
struct vm_pagequeue *pq;
boolean_t unchanged;
- u_short queue;
+ int queue;
vm_page_lock_assert(m, MA_NOTOWNED);
if (vm_page_trylock(m))
return (TRUE);
queue = m->queue;
- vm_pageout_init_marker(&marker, queue);
+ vm_page_init_marker(&marker, queue);
pq = vm_page_pagequeue(m);
TAILQ_INSERT_AFTER(&pq->pq_pl, m, &marker, plinks.q);
@@ -694,8 +677,8 @@ vm_pageout_launder(struct vm_domain *vmd, int launder,
{
struct vm_pagequeue *pq;
vm_object_t object;
- vm_page_t m, next;
- int act_delta, error, maxscan, numpagedout, starting_target;
+ vm_page_t m, marker, next;
+ int act_delta, error, maxscan, numpagedout, queue, starting_target;
int vnodes_skipped;
bool pageout_ok, queue_locked;
@@ -716,11 +699,14 @@ vm_pageout_launder(struct vm_domain *vmd, int launder,
* swap devices are configured.
*/
if (atomic_load_acq_int(&swapdev_enabled))
- pq = &vmd->vmd_pagequeues[PQ_UNSWAPPABLE];
+ queue = PQ_UNSWAPPABLE;
else
- pq = &vmd->vmd_pagequeues[PQ_LAUNDRY];
+ queue = PQ_LAUNDRY;
scan:
+ pq = &vmd->vmd_pagequeues[queue];
+ marker = &vmd->vmd_markers[queue];
+
vm_pagequeue_lock(pq);
maxscan = pq->pq_cnt;
queue_locked = true;
@@ -762,8 +748,7 @@ scan:
* Unlock the laundry queue, invalidating the 'next' pointer.
* Use a marker to remember our place in the laundry queue.
*/
- TAILQ_INSERT_AFTER(&pq->pq_pl, m, &vmd->vmd_laundry_marker,
- plinks.q);
+ TAILQ_INSERT_AFTER(&pq->pq_pl, m, marker, plinks.q);
vm_pagequeue_unlock(pq);
queue_locked = false;
@@ -889,13 +874,13 @@ relock_queue:
vm_pagequeue_lock(pq);
queue_locked = true;
}
- next = TAILQ_NEXT(&vmd->vmd_laundry_marker, plinks.q);
- TAILQ_REMOVE(&pq->pq_pl, &vmd->vmd_laundry_marker, plinks.q);
+ next = TAILQ_NEXT(marker, plinks.q);
+ TAILQ_REMOVE(&pq->pq_pl, marker, plinks.q);
}
vm_pagequeue_unlock(pq);
- if (launder > 0 && pq == &vmd->vmd_pagequeues[PQ_UNSWAPPABLE]) {
- pq = &vmd->vmd_pagequeues[PQ_LAUNDRY];
+ if (launder > 0 && queue == PQ_UNSWAPPABLE) {
+ queue = PQ_LAUNDRY;
goto scan;
}
@@ -951,7 +936,6 @@ vm_pageout_laundry_worker(void *arg)
vmd = VM_DOMAIN(domain);
pq = &vmd->vmd_pagequeues[PQ_LAUNDRY];
KASSERT(vmd->vmd_segs != 0, ("domain without segments"));
- vm_pageout_init_marker(&vmd->vmd_laundry_marker, PQ_LAUNDRY);
shortfall = 0;
in_shortfall = false;
@@ -1105,7 +1089,7 @@ dolaundry:
static bool
vm_pageout_scan(struct vm_domain *vmd, int pass, int shortage)
{
- vm_page_t m, next;
+ vm_page_t m, marker, next;
struct vm_pagequeue *pq;
vm_object_t object;
long min_scan;
@@ -1159,6 +1143,7 @@ vm_pageout_scan(struct vm_domain *vmd, int pass, int s
* decisions for the inactive queue, only for the active queue.)
*/
pq = &vmd->vmd_pagequeues[PQ_INACTIVE];
+ marker = &vmd->vmd_markers[PQ_INACTIVE];
maxscan = pq->pq_cnt;
vm_pagequeue_lock(pq);
queue_locked = TRUE;
@@ -1250,7 +1235,7 @@ unlock_page:
* vm_page_free(), or vm_page_launder() is called. Use a
* marker to remember our place in the inactive queue.
*/
- TAILQ_INSERT_AFTER(&pq->pq_pl, m, &vmd->vmd_marker, plinks.q);
+ TAILQ_INSERT_AFTER(&pq->pq_pl, m, marker, plinks.q);
vm_page_dequeue_locked(m);
vm_pagequeue_unlock(pq);
queue_locked = FALSE;
@@ -1336,8 +1321,8 @@ drop_page:
vm_pagequeue_lock(pq);
queue_locked = TRUE;
}
- next = TAILQ_NEXT(&vmd->vmd_marker, plinks.q);
- TAILQ_REMOVE(&pq->pq_pl, &vmd->vmd_marker, plinks.q);
+ next = TAILQ_NEXT(marker, plinks.q);
+ TAILQ_REMOVE(&pq->pq_pl, marker, plinks.q);
}
vm_pagequeue_unlock(pq);
@@ -1781,10 +1766,6 @@ vm_pageout_worker(void *arg)
KASSERT(vmd->vmd_segs != 0, ("domain without segments"));
vmd->vmd_last_active_scan = ticks;
- vm_pageout_init_marker(&vmd->vmd_marker, PQ_INACTIVE);
- vm_pageout_init_marker(&vmd->vmd_inacthead, PQ_INACTIVE);
- TAILQ_INSERT_HEAD(&vmd->vmd_pagequeues[PQ_INACTIVE].pq_pl,
- &vmd->vmd_inacthead, plinks.q);
/*
* The pageout daemon worker is never done, so loop forever.
Modified: head/sys/vm/vm_pagequeue.h
==============================================================================
--- head/sys/vm/vm_pagequeue.h Thu Apr 19 13:37:59 2018 (r332770)
+++ head/sys/vm/vm_pagequeue.h Thu Apr 19 14:09:44 2018 (r332771)
@@ -107,8 +107,7 @@ struct vm_domain {
boolean_t vmd_oom;
int vmd_oom_seq;
int vmd_last_active_scan;
- struct vm_page vmd_laundry_marker;
- struct vm_page vmd_marker; /* marker for pagedaemon private use */
+ struct vm_page vmd_markers[PQ_COUNT]; /* markers for queue scans */
struct vm_page vmd_inacthead; /* marker for LRU-defeating insertions */
int vmd_pageout_wanted; /* (a, p) pageout daemon wait channel */
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