ANDROID: vmscan: add vendor hook to tune scan control

Add vendor hook to tune scan control for direct reclaim.

Bug: 351175506
Change-Id: Ice72a738f3b74949123be3b03d71f7ba638f161b
Signed-off-by: Sooyong Suk <s.suk@samsung.corp-partner.google.com>

drivers/android/vendor_hooks.c

@@ -311,3 +311,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_contig_range_not_isolated);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_warn_alloc_tune_ratelimit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_warn_alloc_show_mem_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_use_vm_swappiness);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_tune_scan_control);

include/trace/hooks/vmscan.h

@@ -46,6 +46,9 @@ DECLARE_HOOK(android_vh_rebalance_anon_lru_bypass,
 DECLARE_HOOK(android_vh_use_vm_swappiness,
 	TP_PROTO(bool *use_vm_swappiness),
 	TP_ARGS(use_vm_swappiness));
+DECLARE_HOOK(android_vh_tune_scan_control,
+	TP_PROTO(bool *skip_swap),
+	TP_ARGS(skip_swap));
 #endif /* _TRACE_HOOK_VMSCAN_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>

mm/vmscan.c

@@ -6558,6 +6558,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 		.may_unmap = 1,
 		.may_swap = 1,
 	};
+	bool skip_swap = false;
 
 	/*
 	 * scan_control uses s8 fields for order, priority, and reclaim_idx.
@@ -6575,6 +6576,9 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 	if (throttle_direct_reclaim(sc.gfp_mask, zonelist, nodemask))
 		return 1;
 
+	trace_android_vh_tune_scan_control(&skip_swap);
+	if (skip_swap)
+		sc.may_swap = 0;
 	set_task_reclaim_state(current, &sc.reclaim_state);
 	trace_mm_vmscan_direct_reclaim_begin(order, sc.gfp_mask);