ANDROID: mm: add vendor hook to bypass migration target

Add a vendor hook to skip certain page block for compaction target.

Bug: 378012042
Change-Id: Ibed26c4d8a7ea9eb4d1900a16f15498267867f6b
Signed-off-by: Sooyong Suk <s.suk@samsung.corp-partner.google.com>

drivers/android/vendor_hooks.c

@@ -180,6 +180,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_isolate_freepages);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_oom_check_panic);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rmqueue_smallest_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_one_page_bypass);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_migration_target_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_adjust_alloc_flags);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_wait_for_work);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_oem_binder_struct);

include/trace/hooks/mm.h

@@ -64,6 +64,9 @@ DECLARE_HOOK(android_vh_free_one_page_bypass,
 	TP_PROTO(struct page *page, struct zone *zone, int order, int migratetype,
 		int fpi_flags, bool *bypass),
 	TP_ARGS(page, zone, order, migratetype, fpi_flags, bypass));
+DECLARE_HOOK(android_vh_migration_target_bypass,
+	TP_PROTO(struct page *page, bool *bypass),
+	TP_ARGS(page, bypass));
 
 struct page_vma_mapped_walk;
 DECLARE_HOOK(android_vh_slab_alloc_node,

mm/compaction.c

@@ -1417,6 +1417,8 @@ static bool suitable_migration_source(struct compact_control *cc,
 static bool suitable_migration_target(struct compact_control *cc,
 							struct page *page)
 {
+	bool bypass = false;
+
 	/* If the page is a large free page, then disallow migration */
 	if (PageBuddy(page)) {
 		int order = cc->order > 0 ? cc->order : pageblock_order;
@@ -1430,6 +1432,10 @@ static bool suitable_migration_target(struct compact_control *cc,
 			return false;
 	}
 
+	trace_android_vh_migration_target_bypass(page, &bypass);
+	if (bypass)
+		return false;
+
 	if (cc->ignore_block_suitable)
 		return true;
 
@@ -1497,6 +1503,7 @@ fast_isolate_around(struct compact_control *cc, unsigned long pfn)
 {
 	unsigned long start_pfn, end_pfn;
 	struct page *page;
+	bool bypass = false;
 
 	/* Do not search around if there are enough pages already */
 	if (cc->nr_freepages >= cc->nr_migratepages)
@@ -1514,6 +1521,10 @@ fast_isolate_around(struct compact_control *cc, unsigned long pfn)
 	if (!page)
 		return;
 
+	trace_android_vh_migration_target_bypass(page, &bypass);
+	if (bypass)
+		return;
+
 	isolate_freepages_block(cc, &start_pfn, end_pfn, cc->freepages, 1, false);
 
 	/* Skip this pageblock in the future as it's full or nearly full */