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[Bug bpf/22330] bpf: generate printf via event tuples, userspace formatting postprocessing
- From: "me at serhei dot io" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Mon, 20 Aug 2018 15:58:21 +0000
- Subject: [Bug bpf/22330] bpf: generate printf via event tuples, userspace formatting postprocessing
- Auto-submitted: auto-generated
- References: <bug-22330-6586@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=22330
--- Comment #2 from Serhei Makarov <me at serhei dot io> ---
As part of the reworking of printf() on stapbpf, large printf() invocations
should also be split up into a series of manageable ones. The following example
should work:
probe kernel.trace("netif_receive_skb"), kernel.trace("netif_rx"),
kernel.trace("net_dev_queue"), kernel.trace("napi_gro_receive_entry") {
printf("vars %s\n", $$vars);
}
Currently it fails with "too many arguments to print (19)".
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