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![Ian Rogers](/assets/img/avatar_default.png)
Don't use deprecated and now broken map style. Avoid use of tools/perf/include/bpf/bpf.h and use the more regular BPF headers. Switch to raw_syscalls:sys_enter to avoid the evlist being empty and fixing generating output. Committer testing: # perf trace -e ~acme/git/perf/tools/perf/examples/bpf/hello.c --call-graph=dwarf --max-events 5 0.000 perf/206852 __bpf_stdout__(Hello, world) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64_after_hwframe ([kernel.kallsyms]) __GI___sched_setaffinity_new (/usr/lib64/libc.so.6) 8.561 pipewire/2290 __bpf_stdout__(Hello, world) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64_after_hwframe ([kernel.kallsyms]) __libc_read (/usr/lib64/libc.so.6) 8.571 pipewire/2290 __bpf_stdout__(Hello, world) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64_after_hwframe ([kernel.kallsyms]) __GI___ioctl (/usr/lib64/libc.so.6) 8.586 pipewire/2290 __bpf_stdout__(Hello, world) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64_after_hwframe ([kernel.kallsyms]) __GI___write (/usr/lib64/libc.so.6) 8.592 pipewire/2290 __bpf_stdout__(Hello, world) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) syscall_trace_enter.constprop.0 ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64_after_hwframe ([kernel.kallsyms]) __timerfd_settime (/usr/lib64/libc.so.6) # Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: https://lore.kernel.org/r/20221103045437.163510-5-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
27 lines
672 B
C
27 lines
672 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct __bpf_stdout__ {
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__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
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__type(key, int);
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__type(value, __u32);
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__uint(max_entries, __NR_CPUS__);
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} __bpf_stdout__ SEC(".maps");
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#define puts(from) \
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({ const int __len = sizeof(from); \
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char __from[sizeof(from)] = from; \
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bpf_perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \
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&__from, __len & (sizeof(from) - 1)); })
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struct syscall_enter_args;
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SEC("raw_syscalls:sys_enter")
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int sys_enter(struct syscall_enter_args *args)
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{
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puts("Hello, world\n");
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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