The patch titled
Subject: mm/mm_init.c: get the highest zone directly
has been added to the -mm mm-unstable branch. Its filename is
mm-mm_initc-get-the-highest-zone-directly.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mm_initc-get-the-highest-zone-directly.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/mm_init.c: get the highest zone directly
Date: Fri, 31 May 2024 00:26:11 +0000
We have recorded nr_zones in pgdat, just get it directly.
Link: https://lkml.kernel.org/r/20240531002613.5231-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mm_init.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
--- a/mm/mm_init.c~mm-mm_initc-get-the-highest-zone-directly
+++ a/mm/mm_init.c
@@ -2138,7 +2138,7 @@ static int __init deferred_init_memmap(v
unsigned long first_init_pfn, flags;
unsigned long start = jiffies;
struct zone *zone;
- int zid, max_threads;
+ int max_threads;
u64 i;
/* Bind memory initialisation thread to a local node if possible */
@@ -2165,12 +2165,8 @@ static int __init deferred_init_memmap(v
*/
pgdat_resize_unlock(pgdat, &flags);
- /* Only the highest zone is deferred so find it */
- for (zid = 0; zid < MAX_NR_ZONES; zid++) {
- zone = pgdat->node_zones + zid;
- if (first_init_pfn < zone_end_pfn(zone))
- break;
- }
+ /* Only the highest zone is deferred */
+ zone = pgdat->node_zones + pgdat->nr_zones - 1;
/* If the zone is empty somebody else may have cleared out the zone */
if (!deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn,
@@ -2198,7 +2194,7 @@ static int __init deferred_init_memmap(v
}
zone_empty:
/* Sanity check that the next zone really is unpopulated */
- WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone));
+ WARN_ON(pgdat->nr_zones < MAX_NR_ZONES && populated_zone(++zone));
pr_info("node %d deferred pages initialised in %ums\n",
pgdat->node_id, jiffies_to_msecs(jiffies - start));
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-mm_initc-get-the-highest-zone-directly.patch
mm-mm_initc-use-deferred_init_mem_pfn_range_in_zone-to-decide-loop-condition.patch
mm-mm_initc-not-always-search-next-deferred_init_pfn-from-very-beginning.patch
