ANDROID: mm: add vendor hook to tune warn_alloc

Add vendor hook to tune or add ratelimit at warn_alloc.

Bug: 351175506

Change-Id: Iff75cc98aa29d29f06f924dac5ed6df2c0ffffdb
Signed-off-by: Sooyong Suk <s.suk@samsung.corp-partner.google.com>

drivers/android/vendor_hooks.c

@@ -308,3 +308,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_trigger_vendor_lmk_kill);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_pages_slowpath_start);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_pages_slowpath_end);
 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);

include/trace/hooks/mm.h

@@ -200,6 +200,12 @@ DECLARE_HOOK(android_vh_alloc_pages_slowpath_end,
 DECLARE_HOOK(android_vh_alloc_contig_range_not_isolated,
 	TP_PROTO(unsigned long start, unsigned end),
 	TP_ARGS(start, end));
+DECLARE_HOOK(android_vh_warn_alloc_tune_ratelimit,
+	TP_PROTO(struct ratelimit_state *rs),
+	TP_ARGS(rs));
+DECLARE_HOOK(android_vh_warn_alloc_show_mem_bypass,
+	TP_PROTO(bool *bypass),
+	TP_ARGS(bypass));
 #endif /* _TRACE_HOOK_MM_H */
 
 /* This part must be outside protection */

mm/page_alloc.c

@@ -3657,7 +3657,11 @@ try_this_zone:
 static void warn_alloc_show_mem(gfp_t gfp_mask, nodemask_t *nodemask)
 {
 	unsigned int filter = SHOW_MEM_FILTER_NODES;
+	bool bypass = false;
 
+	trace_android_vh_warn_alloc_show_mem_bypass(&bypass);
+	if (bypass)
+		return;
 	/*
 	 * This documents exceptions given to allocations in certain
 	 * contexts that are allowed to allocate outside current's set
@@ -3679,6 +3683,7 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...)
 	va_list args;
 	static DEFINE_RATELIMIT_STATE(nopage_rs, 10*HZ, 1);
 
+	trace_android_vh_warn_alloc_tune_ratelimit(&nopage_rs);
 	if ((gfp_mask & __GFP_NOWARN) ||
 	     !__ratelimit(&nopage_rs) ||
 	     ((gfp_mask & __GFP_DMA) && !has_managed_dma()))