ANDROID: vendor_hooks: add hooks for adjust kvmalloc_node alloc_flags

since we can't control all kvmalloc_node callsite's gfp_flags, we add
a vendor hook in kvmalloc_node to tune the reclaim behavior for some
really high-order allocation

Bug: 300857012
Bug: 395197442
Change-Id: I5f0c4c2921d204289911704e3a205f6a1dc50d04
Signed-off-by: liwei <liwei1234@oppo.com>
Signed-off-by: wengle <wengle@oppo.com>

drivers/android/vendor_hooks.c

@@ -369,6 +369,7 @@ 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);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_save_track_hash);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_adjust_kvmalloc_flags);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_exit_signal);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_process_madvise_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_madvise_pageout_return_error);

include/trace/hooks/mm.h

@@ -346,6 +346,9 @@ DECLARE_HOOK(android_vh_show_stack_hash,
 DECLARE_HOOK(android_vh_save_track_hash,
 	TP_PROTO(bool alloc, struct track *p),
 	TP_ARGS(alloc, p));
+DECLARE_HOOK(android_vh_adjust_kvmalloc_flags,
+	TP_PROTO(unsigned int order, gfp_t *alloc_flags),
+	TP_ARGS(order, alloc_flags));
 #endif /* _TRACE_HOOK_MM_H */
 
 /* This part must be outside protection */

mm/util.c

@@ -633,6 +633,8 @@ static gfp_t kmalloc_gfp_adjust(gfp_t flags, size_t size)
 		flags &= ~__GFP_NOFAIL;
 	}
 
+	trace_android_vh_adjust_kvmalloc_flags(get_order(size), &flags);
+
 	return flags;
 }