ANDROID: vendor_hooks:vendor hook for control memory dirty rate

When the IO pressure increases or the system performs dirty
page balancing, the frame rate of the foreground application
may become unstable. Therefore, a hook point is added to limit
the buffer IO rate from the source.

Bug: 262189942
Change-Id: I5214d611a388c5e8d87dc44ffde86ead1834ddff
Signed-off-by: xiaofeng <xiaofeng5@xiaomi.com>

drivers/android/vendor_hooks.c

@@ -412,7 +412,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_init_aes_encrypt);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_skip_swap_map_write);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_post_image_save);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_dm_update_clone_bio);
-
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_ctl_dirty_rate);
 /*
  * For type visibility
  */

include/trace/hooks/mm.h

@@ -159,6 +159,9 @@ DECLARE_HOOK(android_vh_kmalloc_slab,
 DECLARE_HOOK(android_vh_madvise_cold_or_pageout,
 	TP_PROTO(struct vm_area_struct *vma, bool *allow_shared),
 	TP_ARGS(vma, allow_shared));
+DECLARE_RESTRICTED_HOOK(android_rvh_ctl_dirty_rate,
+	TP_PROTO(void *unused),
+	TP_ARGS(unused), 1);
 #endif /* _TRACE_HOOK_MM_H */
 
 /* This part must be outside protection */

mm/page-writeback.c

@@ -1886,6 +1886,8 @@ void balance_dirty_pages_ratelimited(struct address_space *mapping)
 	if (!(bdi->capabilities & BDI_CAP_WRITEBACK))
 		return;
 
+	trace_android_rvh_ctl_dirty_rate(NULL);
+
 	if (inode_cgwb_enabled(inode))
 		wb = wb_get_create_current(bdi, GFP_KERNEL);
 	if (!wb)