lkml.org 
[lkml]   [2022]   [Sep]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -next v3 1/2] mm: Cap zone movable's min wmark to small value
Date
From: Ma Wupeng <mawupeng1@huawei.com>

Since min_free_kbytes is based on gfp_zone(GFP_USER) which does not include
zone movable. However zone movable will get its min share in
__setup_per_zone_wmarks() which does not make any sense.

And like highmem pages, __GFP_HIGH and PF_MEMALLOC allocations usually
don't need movable pages, so there is no need to assign min pages for zone
movable.

Let's cap pages_min for zone movable to a small value here just link
highmem pages.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
---
mm/page_alloc.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e5486d47406e..f1e4474879f1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8636,9 +8636,9 @@ static void __setup_per_zone_wmarks(void)
struct zone *zone;
unsigned long flags;

- /* Calculate total number of !ZONE_HIGHMEM pages */
+ /* Calculate total number of none highmem/movable pages */
for_each_zone(zone) {
- if (!is_highmem(zone))
+ if (!is_highmem(zone) && zone_idx(zone) != ZONE_MOVABLE)
lowmem_pages += zone_managed_pages(zone);
}

@@ -8648,15 +8648,15 @@ static void __setup_per_zone_wmarks(void)
spin_lock_irqsave(&zone->lock, flags);
tmp = (u64)pages_min * zone_managed_pages(zone);
do_div(tmp, lowmem_pages);
- if (is_highmem(zone)) {
+ if (is_highmem(zone) || zone_idx(zone) == ZONE_MOVABLE) {
/*
* __GFP_HIGH and PF_MEMALLOC allocations usually don't
- * need highmem pages, so cap pages_min to a small
- * value here.
+ * need highmem/movable pages, so cap pages_min to a
+ * small value here.
*
* The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN)
* deltas control async page reclaim, and so should
- * not be capped for highmem.
+ * not be capped for highmem/movable zone.
*/
unsigned long min_pages;

--
2.25.1
\
 
 \ /
  Last update: 2022-09-05 05:30    [W:0.115 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site