[patch 032/212] mm, slub: detach whole partial list at once in unfreeze_partials()

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From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, slub: detach whole partial list at once in unfreeze_partials()

Instead of iterating through the live percpu partial list, detach it from
the kmem_cache_cpu at once.  This is simpler and will allow further
optimization.

Link: https://lkml.kernel.org/r/20210805152000.12817-25-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/slub.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/mm/slub.c~mm-slub-detach-whole-partial-list-at-once-in-unfreeze_partials
+++ a/mm/slub.c
@@ -2344,16 +2344,20 @@ static void unfreeze_partials(struct kme
 {
 #ifdef CONFIG_SLUB_CPU_PARTIAL
 	struct kmem_cache_node *n = NULL, *n2 = NULL;
-	struct page *page, *discard_page = NULL;
+	struct page *page, *partial_page, *discard_page = NULL;
 	unsigned long flags;
 
 	local_irq_save(flags);
 
-	while ((page = slub_percpu_partial(c))) {
+	partial_page = slub_percpu_partial(c);
+	c->partial = NULL;
+
+	while (partial_page) {
 		struct page new;
 		struct page old;
 
-		slub_set_percpu_partial(c, page);
+		page = partial_page;
+		partial_page = page->next;
 
 		n2 = get_node(s, page_to_nid(page));
 		if (n != n2) {
_



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