ANDROID: mm: add vendor hook in vmscan.c

Add vendor hook to skip rebalance anon lru list.

Bug: 351175506
Change-Id: Ib4e56976d892b96f6c319a1b69d23d71ac7ce993
Signed-off-by: Sooyong Suk <s.suk@samsung.corp-partner.google.com>

drivers/android/vendor_hooks.c

@@ -275,3 +275,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_async_psi_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_cma_alloc_retry);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_smaps_pte_entry);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_show_smap);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rebalance_anon_lru_bypass);

include/trace/hooks/vmscan.h

@@ -40,6 +40,9 @@ DECLARE_HOOK(android_vh_should_memcg_bypass,
 DECLARE_HOOK(android_vh_do_shrink_slab,
 	TP_PROTO(struct shrinker *shrinker, long *freeable),
 	TP_ARGS(shrinker, freeable));
+DECLARE_HOOK(android_vh_rebalance_anon_lru_bypass,
+	TP_PROTO(bool *bypass),
+	TP_ARGS(bypass));
 #endif /* _TRACE_HOOK_VMSCAN_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>

mm/vmscan.c

@@ -5712,6 +5712,7 @@ static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
 	unsigned long nr_to_reclaim = sc->nr_to_reclaim;
 	bool proportional_reclaim;
 	struct blk_plug plug;
+	bool bypass = false;
 
 	if (lru_gen_enabled() && !root_reclaim(sc)) {
 		lru_gen_shrink_lruvec(lruvec, sc);
@@ -5809,6 +5810,9 @@ static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
 	}
 	blk_finish_plug(&plug);
 	sc->nr_reclaimed += nr_reclaimed;
+	trace_android_vh_rebalance_anon_lru_bypass(&bypass);
+	if (bypass)
+		return;
 
 	/*
 	 * Even if we did not try to evict anon pages at all, we want to