ANDROID: vendor_hooks: Add hooks for isolate lru folio am: f5df5e6

Original change: https://android-review.googlesource.com/c/kernel/common/+/3834194

Change-Id: I47a330cf9099889a2c18fa381c9ba960420ec500
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

Author: Qinglin Li

drivers/android/vendor_hooks.c

@@ -660,3 +660,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_kswapd_shrink_node);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_keep_reclaimed_folio);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_clear_reclaimed_folio);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_evict_folios_bypass);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_may_unmap_folio);

include/trace/hooks/vmscan.h

@@ -11,6 +11,7 @@
 
 struct mem_cgroup_reclaim_cookie;
 struct lruvec;
+struct scan_control;
 
 DECLARE_RESTRICTED_HOOK(android_rvh_set_balance_anon_file_reclaim,
 			TP_PROTO(bool *balance_anon_file_reclaim),
@@ -141,6 +142,10 @@ DECLARE_HOOK(android_vh_mm_customize_pgdat_balanced,
 DECLARE_HOOK(android_vh_mm_customize_reclaim_idx,
 	TP_PROTO(int order, gfp_t gfp, s8 *reclaim_idx, enum zone_type *highest_zoneidx),
 	TP_ARGS(order, gfp, reclaim_idx, highest_zoneidx));
+DECLARE_HOOK(android_vh_may_unmap_folio,
+	TP_PROTO(enum lru_list lru, struct scan_control *sc, struct folio *folio, bool *bypass),
+	TP_ARGS(lru, sc, folio, bypass));
+
 #endif /* _TRACE_HOOK_VMSCAN_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>

mm/vmscan.c

@@ -1774,6 +1774,7 @@ static unsigned long isolate_lru_folios(unsigned long nr_to_scan,
 	unsigned long scan, total_scan, nr_pages;
 	LIST_HEAD(folios_skipped);
 	unsigned long nr_scanned_before = *nr_scanned;
+	bool bypass = false;
 
 	trace_android_vh_mm_isolate_priv_lru(nr_to_scan, lruvec, lru, dst, sc->reclaim_idx,
 					     sc->may_unmap, nr_scanned, &nr_taken);
@@ -1810,6 +1811,11 @@ static unsigned long isolate_lru_folios(unsigned long nr_to_scan,
 
 		if (!folio_test_lru(folio))
 			goto move;
+
+		trace_android_vh_may_unmap_folio(lru, sc, folio, &bypass);
+		if (bypass)
+			goto move;
+
 		if (!sc->may_unmap && folio_mapped(folio))
 			goto move;