diff --git a/tools/stacksnoop b/tools/stacksnoop
new file mode 100755
index 0000000..bd5c0c9
--- /dev/null
+++ b/tools/stacksnoop
@@ -0,0 +1,130 @@
+#!/usr/bin/python
+#
+# stacksnoop    Trace a kernel function and print all kernel stack traces.
+#               For Linux, uses BCC, eBPF, and currently x86_64 only. Inline C.
+#
+# USAGE: stacksnoop [-h] [-p PID] [-s] [-v] function
+#
+# The current implementation uses an unrolled loop for x86_64, and was written
+# as a proof of concept. This implementation should be replaced in the future
+# with an appropriate bpf_ call, when available.
+#
+# The stack depth is limited to 10 (+1 for the current instruction pointer).
+# This could be tunable in a future version.
+#
+# Copyright 2016 Netflix, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+#
+# 12-Jan-2016   Brendan Gregg   Created this.
+
+from __future__ import print_function
+from bcc import BPF
+import argparse
+
+# arguments
+examples = """examples:
+    ./stacksnoop ext4_sync_fs    # print kernel stack traces for ext4_sync_fs
+    ./stacksnoop -s ext4_sync_fs    # ... also show symbol offsets
+    ./stacksnoop -v ext4_sync_fs    # ... show extra columns
+    ./stacksnoop -p 185 ext4_sync_fs    # ... only when PID 185 is on-CPU
+"""
+parser = argparse.ArgumentParser(
+    description="Trace and print kernel stack traces for a kernel function",
+    formatter_class=argparse.RawDescriptionHelpFormatter,
+    epilog=examples)
+parser.add_argument("-p", "--pid",
+    help="trace this PID only")
+parser.add_argument("-s", "--offset", action="store_true",
+    help="show address offsets")
+parser.add_argument("-v", "--verbose", action="store_true",
+    help="print more fields")
+parser.add_argument("function",
+    help="kernel function name")
+args = parser.parse_args()
+function = args.function
+offset = args.offset
+verbose = args.verbose
+debug = 0
+
+# define BPF program
+bpf_text = """
+#include <uapi/linux/ptrace.h>
+
+static int print_frame(u64 *bp, int *depth) {
+    if (*bp) {
+        // The following stack walker is x86_64 specific
+        u64 ret = 0;
+        if (bpf_probe_read(&ret, sizeof(ret), (void *)(*bp+8)))
+            return 0;
+        if (!ret || ret < __START_KERNEL_map)
+            return 0;
+        bpf_trace_printk("r%d: %llx\\n", *depth, ret);
+        if (bpf_probe_read(bp, sizeof(*bp), (void *)*bp))
+            return 0;
+        *depth += 1;
+        return 1;
+    }
+    return 0;
+}
+
+void trace_stack(struct pt_regs *ctx) {
+    FILTER
+    u64 bp = 0;
+    int depth = 0;
+
+    bpf_trace_printk("\\n");
+    if (ctx->ip)
+        bpf_trace_printk("ip: %llx\\n", ctx->ip);
+    bp = ctx->bp;
+
+    // unrolled loop, 10 frames deep:
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+    if (!print_frame(&bp, &depth)) return;
+};
+"""
+if args.pid:
+    bpf_text = bpf_text.replace('FILTER',
+        ('u32 pid; pid = bpf_get_current_pid_tgid(); ' +
+        'if (pid != %s) { return 0; }') % (args.pid))
+else:
+    bpf_text = bpf_text.replace('FILTER', '')
+if debug:
+    print(bpf_text)
+
+# initialize BPF
+b = BPF(text=bpf_text)
+b.attach_kprobe(event=function, fn_name="trace_stack")
+matched = b.num_open_kprobes()
+if matched == 0:
+    print("Function \"%s\" not found. Exiting." % function)
+    exit()
+
+# header
+if verbose:
+    print("%-18s %-12s %-6s %-3s %s" % ("TIME(s)", "COMM", "PID", "CPU",
+        "STACK"))
+else:
+    print("%-18s %s" % ("TIME(s)", "STACK"))
+
+# format output
+while 1:
+    (task, pid, cpu, flags, ts, msg) = b.trace_fields()
+    if msg != "":
+        (reg, addr) = msg.split(" ")
+        if offset:
+            ip = b.ksymaddr(int(addr, 16))
+        else:
+            ip = b.ksym(int(addr, 16))
+        msg = msg + " " + ip
+    if verbose:
+        print("%-18.9f %-12.12s %-6d %-3d %s" % (ts, task, pid, cpu, msg))
+    else:
+        print("%-18.9f %s" % (ts, msg))