[RFC,3/4] mm/page_isolation: remove migratetype from undo_isolate_page_range()

Commit Message

Zi Yan Aug. 28, 2024, 8:22 p.m. UTC

Since migratetype is no longer overwritten during pageblock isolation,
undoing pageblock isolation no longer needs which migratetype to restore.

Signed-off-by: Zi Yan <[e-mail]>
---
 include/linux/page-isolation.h | 3 +--
 mm/memory_hotplug.c            | 4 ++--
 mm/page_alloc.c                | 2 +-
 mm/page_isolation.c            | 9 +++------
 4 files changed, 7 insertions(+), 11 deletions(-)

Comments

David Hildenbrand Sept. 2, 2024, 9 a.m. UTC | #1

On 28.08.24 22:22, Zi Yan wrote:
> Since migratetype is no longer overwritten during pageblock isolation,
> undoing pageblock isolation no longer needs which migratetype to restore.
> 
> Signed-off-by: Zi Yan <[e-mail]>
> ---

Yes, that's the right way of doing it.

Acked-by: David Hildenbrand <[e-mail]>

Zi Yan Sept. 2, 2024, 3:34 p.m. UTC | #2

On 2 Sep 2024, at 5:00, David Hildenbrand wrote:

> On 28.08.24 22:22, Zi Yan wrote:
>> Since migratetype is no longer overwritten during pageblock isolation,
>> undoing pageblock isolation no longer needs which migratetype to restore.
>>
>> Signed-off-by: Zi Yan <[e-mail]>
>> ---
>
> Yes, that's the right way of doing it.
>
> Acked-by: David Hildenbrand <[e-mail]>

Thanks. :)

--
Best Regards,
Yan, Zi

Patch

diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 6a62401410c3..c2a1bd621561 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -40,8 +40,7 @@  bool move_freepages_block_isolate(struct zone *zone, struct page *page);
 int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 			     int migratetype, int flags, gfp_t gfp_flags);
 
-void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
-			     int migratetype);
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn);
 
 int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
 			int isol_flags);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 721392906dcb..4265272faf4c 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1202,7 +1202,7 @@  int online_pages(unsigned long pfn, unsigned long nr_pages,
 		build_all_zonelists(NULL);
 
 	/* Basic onlining is complete, allow allocation of onlined pages. */
-	undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE);
+	undo_isolate_page_range(pfn, pfn + nr_pages);
 
 	/*
 	 * Freshly onlined pages aren't shuffled (e.g., all pages are placed to
@@ -2104,7 +2104,7 @@  int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
 
 failed_removal_isolated:
 	/* pushback to free area */
-	undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
+	undo_isolate_page_range(start_pfn, end_pfn);
 	memory_notify(MEM_CANCEL_OFFLINE, &arg);
 failed_removal_pcplists_disabled:
 	lru_cache_enable();
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index dc7c36461953..4d06932ba69a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6679,7 +6679,7 @@  int alloc_contig_range_noprof(unsigned long start, unsigned long end,
 		     start, end, outer_start, outer_end);
 	}
 done:
-	undo_isolate_page_range(start, end, migratetype);
+	undo_isolate_page_range(start, end);
 	return ret;
 }
 EXPORT_SYMBOL(alloc_contig_range_noprof);
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 3ffdfddbdd50..4c65157d78ef 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -512,7 +512,7 @@  int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 		page = __first_valid_page(pfn, pageblock_nr_pages);
 		if (page && set_migratetype_isolate(page, migratetype, flags,
 					start_pfn, end_pfn)) {
-			undo_isolate_page_range(isolate_start, pfn, migratetype);
+			undo_isolate_page_range(isolate_start, pfn);
 			unset_migratetype_isolate(
 				pfn_to_page(isolate_end - pageblock_nr_pages));
 			return -EBUSY;
@@ -525,13 +525,10 @@  int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
  * undo_isolate_page_range - undo effects of start_isolate_page_range()
  * @start_pfn:		The first PFN of the isolated range
  * @end_pfn:		The last PFN of the isolated range
- * @migratetype:	New migrate type to set on the range
  *
- * This finds every MIGRATE_ISOLATE page block in the given range
- * and switches it to @migratetype.
+ * This finds and unsets every MIGRATE_ISOLATE page block in the given range
  */
-void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
-			    int migratetype)
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn)
 {
 	unsigned long pfn;
 	struct page *page;