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Subject[RFC v2 24/34] mm, slub: detach whole partial list at once in unfreeze_partials()
Date
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.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
mm/slub.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index dcbc5baea702..3e0ec7211d55 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2298,16 +2298,20 @@ static void unfreeze_partials(struct kmem_cache *s,
{
#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) {
--
2.31.1
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