On Mon, Nov 21, 2022 at 12:01:23PM +0000, Mel Gorman wrote:
> On Fri, Nov 18, 2022 at 03:30:57PM +0100, Vlastimil Babka wrote:
> > On 11/18/22 11:17, Mel Gorman wrote:
> > AFAICS if this block was just "locked_zone = NULL;" then the existing code
> > would do the right thing.
> > Or maybe to have simpler code, just do batch_count++ here and
> > make the relocking check do
> > if (zone != locked_zone || batch_count == SWAP_CLUSTER_MAX)
> >
>
> While I think you're right, I think it's a bit subtle, the batch reset would
> need to move, rechecked within the "Different zone, different pcp lock."
> block and it would be easy to forget exactly why it's structured like
> that in the future. Rather than being a fix, it could be a standalone
> patch so it would be obvious in git blame but I don't feel particularly
> strongly about it.
>
Ok, less subtle than I initially thought but still deserving of a separate
patch instead of being a fix. This?
--8<--
mm/page_alloc: Simplify locking during free_unref_page_list
While freeing a large list, the zone lock will be released and reacquired
to avoid long hold times since commit c24ad77d962c ("mm/page_alloc.c: avoid
excessive IRQ disabled times in free_unref_page_list()"). As suggested
by Vlastimil Babka, the lockrelease/reacquire logic can be simplified by
reusing the logic that acquires a different lock when changing zones.
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 25 +++++++++----------------
1 file changed, 9 insertions(+), 16 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 445066617204..08e32daf0918 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3518,13 +3518,19 @@ void free_unref_page_list(struct list_head *list)
list_del(&page->lru);
migratetype = get_pcppage_migratetype(page);
- /* Different zone, different pcp lock. */
- if (zone != locked_zone) {
+ /*
+ * Either different zone requiring a different pcp lock or
+ * excessive lock hold times when freeing a large list of
+ * pages.
+ */
+ if (zone != locked_zone || batch_count == SWAP_CLUSTER_MAX) {
if (pcp) {
pcp_spin_unlock(pcp);
pcp_trylock_finish(UP_flags);
}
+ batch_count = 0;
+
/*
* trylock is necessary as pages may be getting freed
* from IRQ or SoftIRQ context after an IO completion.
@@ -3539,7 +3545,6 @@ void free_unref_page_list(struct list_head *list)
continue;
}
locked_zone = zone;
- batch_count = 0;
}
/*
@@ -3551,19 +3556,7 @@ void free_unref_page_list(struct list_head *list)
trace_mm_page_free_batched(page);
free_unref_page_commit(zone, pcp, page, migratetype, 0);
-
- /*
- * Guard against excessive lock hold times when freeing
- * a large list of pages. Lock will be reacquired if
- * necessary on the next iteration.
- */
- if (++batch_count == SWAP_CLUSTER_MAX) {
- pcp_spin_unlock(pcp);
- pcp_trylock_finish(UP_flags);
- batch_count = 0;
- pcp = NULL;
- locked_zone = NULL;
- }
+ batch_count++;
}
if (pcp) {
