profile: remove unnecessary bpf_probe_read call (#1822)

37f7fef2 · Paul Chaignon · yonghong-song · 69728067 · 37f7fef2
Commit 37f7fef2 authored Jun 14, 2018 by Paul Chaignon Committed by yonghong-song Jun 13, 2018
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tools/profile.py tools/profile.py +1 -3

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--- a/tools/profile.py
+++ b/tools/profile.py
@@ -153,9 +153,7 @@ int do_perf_event(struct bpf_perf_event_data *ctx) {
    if (key.kernel_stack_id >= 0) {
        // populate extras to fix the kernel stack
-        struct pt_regs regs = {};
+        u64 ip = PT_REGS_IP(&ctx->regs);
-        bpf_probe_read(&regs, sizeof(regs), (void *)&ctx->regs);
-        u64 ip = PT_REGS_IP(&regs);
        u64 page_offset;
        // if ip isn't sane, leave key ips as zero for later checking