diff --git a/profiler/Makefile b/profiler/Makefile
index eebb10d..5587116 100644
--- a/profiler/Makefile
+++ b/profiler/Makefile
@@ -7,12 +7,12 @@ BPFTOOL ?= $(abspath ../tools/bpftool)
 LIBBPF_SRC := $(abspath ../libbpf/src)
 LIBBPF_OBJ := $(abspath $(OUTPUT)/libbpf.a)
 ARCH := $(shell uname -m | sed 's/x86_64/x86/' | sed 's/aarch64/arm64/' | sed 's/ppc64le/powerpc/' | sed 's/mips.*/mips/')
-VMLINUX := $(ARCH)/$(ARCH)/vmlinux.h
+VMLINUX := ../vmlinux/$(ARCH)/
 HELPERS := $(abspath ../helpers)
 # Use our own libbpf API headers and Linux UAPI headers distributed with
 # libbpf to avoid dependency on system-wide headers, which could be missing or
 # outdated
-INCLUDES := -I$(OUTPUT) -I../libbpf/include/uapi -I$(dir $(VMLINUX)) -I$(HELPERS)
+INCLUDES := -I$(OUTPUT) -I../libbpf/include/uapi -I$(VMLINUX) -I$(HELPERS)
 CFLAGS := -g -Wall # -fsanitize=address
 
 APPS = profile
@@ -45,7 +45,7 @@ all: $(APPS)
 
 $(VMLINUX):
 	$(Q)wget https://github.com/yunwei37/apisix-profiler/releases/download/vmlinux/vmlinux.tar
-	$(Q)tar -xvf vmlinux.tar ../
+	$(Q)tar -xvf vmlinux.tar -C ../
 	$(Q)rm vmlinux.tar
 
 .PHONY: clean
diff --git a/profiler/stack_printer.cpp b/profiler/stack_printer.cpp
index 403320e..28e1115 100644
--- a/profiler/stack_printer.cpp
+++ b/profiler/stack_printer.cpp
@@ -52,11 +52,20 @@ static bool read_batch_counts_map(int fd, struct key_ext_t *items, __u32 *count)
     __u32 vals[*count];
     struct stack_key keys[*count];
 
+    //BPF_F_LOCK 
+    const struct bpf_map_batch_opts batch_opts = {
+        .sz = sizeof(struct stack_key),  
+        .elem_flags = BPF_F_LOCK,     
+    };
+
+
     while (n_read < *count && !err)
     {
         n = *count - n_read;
-        err = bpf_map_lookup_batch(fd, &in, &out, keys + n_read,
-                                   vals + n_read, &n, NULL);
+        err = bpf_map_lookup_batch(fd, &in, &out, 
+                                   keys + n_read * sizeof(stack_key),
+                                   vals + n_read, 
+                                   &n, &batch_opts);
         if (err && errno != ENOENT)
         {
             /* we want to propagate EINVAL upper, so that
@@ -90,7 +99,6 @@ static bool read_counts_map(int fd, struct key_ext_t *items, __u32 *count)
     struct stack_key *lookup_key = &empty;
     int i = 0;
     int err;
-
     if (batch_map_ops)
     {
         bool ok = read_batch_counts_map(fd, items, count);
@@ -324,7 +332,7 @@ void print_stack_trace(struct ksyms *ksyms, struct syms_cache *syms_cache,
 
                 if (stack_id_err(k->kern_stack_id))
                     printf(";[Missed Kernel Stack]");
-                for (std::size_t j = nr_kip - 1; j >= 0; j--)
+                for (int j = nr_kip - 1; j >= 0; j--)
                 {
                     ksym = ksyms__map_addr(ksyms, kip[j]);
                     printf(";%s", ksym ? ksym->name : "[unknown]");