save one bpf_probe_read()

d18657ec · Brendan Gregg · 0a7f5ac9 · d18657ec
Commit d18657ec authored Feb 10, 2016 by Brendan Gregg
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Showing with 3 additions and 2 deletions

tools/dcsnoop.py tools/dcsnoop.py +3 -2

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--- a/tools/dcsnoop.py
+++ b/tools/dcsnoop.py
@@ -70,8 +70,9 @@ int kprobe__d_lookup(struct pt_regs *ctx, const struct dentry *parent,
 {
    u32 pid = bpf_get_current_pid_tgid();
    struct entry_t entry = {};
-    if (name->name) {
+    const char *fname = name->name;
-        bpf_probe_read(&entry.name, sizeof(entry.name), (void *)name->name);
+    if (fname) {
+        bpf_probe_read(&entry.name, sizeof(entry.name), (void *)fname);
    }
    entrybypid.update(&pid, &entry);
    return 0;