ANDROID: vendor_hooks: add hook for adjusting a more suitable watermark

During zone initialization adjust a more suitable watermark for Customize, which can optimize kswapd load and system memory status.

Bug: 364225965
Change-Id: Ib6d94ec244f504a1c474657833a5f7558ea5d00b
Signed-off-by: Justin Jiang <justinjiang@vivo.corp-partner.google.com>
Signed-off-by: wengle <wengle@oppo.com>

drivers/android/vendor_hooks.c

@@ -468,3 +468,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_bd_link_disk_holder);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_new_ref);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_del_ref);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_fsnotify_open);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_init_adjust_zone_wmark);

include/trace/hooks/mm.h

@@ -416,6 +416,9 @@ DECLARE_HOOK(android_rvh_alloc_pages_reclaim_cycle_end,
 DECLARE_HOOK(android_vh_kmalloc_slab,
 	TP_PROTO(unsigned int index, gfp_t flags, struct kmem_cache **s),
 	TP_ARGS(index, flags, s));
+DECLARE_HOOK(android_vh_init_adjust_zone_wmark,
+	TP_PROTO(struct zone *zone, u64 interval),
+	TP_ARGS(zone, interval));
 #endif /* _TRACE_HOOK_MM_H */
 
 /* This part must be outside protection */

mm/page_alloc.c

@@ -6449,6 +6449,7 @@ static void __setup_per_zone_wmarks(void)
 		zone->_watermark[WMARK_HIGH] = low_wmark_pages(zone) + tmp;
 		zone->_watermark[WMARK_PROMO] = high_wmark_pages(zone) + tmp;
 		trace_mm_setup_per_zone_wmarks(zone);
+		trace_android_vh_init_adjust_zone_wmark(zone, tmp);
 
 		spin_unlock_irqrestore(&zone->lock, flags);
 	}