ab4c15feb2
The canonical location for the tracefs filesystem is at /sys/kernel/tracing. But, from Documentation/trace/ftrace.rst: Before 4.1, all ftrace tracing control files were within the debugfs file system, which is typically located at /sys/kernel/debug/tracing. For backward compatibility, when mounting the debugfs file system, the tracefs file system will be automatically mounted at: /sys/kernel/debug/tracing Many tests in the bpf selftest code still refer to this older debugfs path, so let's update them to avoid confusion. Signed-off-by: Ross Zwisler <zwisler@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://lore.kernel.org/r/20230313205628.1058720-3-zwisler@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
25 lines
528 B
C
25 lines
528 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2017 Facebook
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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/* taken from /sys/kernel/tracing/events/sched/sched_switch/format */
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struct sched_switch_args {
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unsigned long long pad;
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char prev_comm[TASK_COMM_LEN];
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int prev_pid;
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int prev_prio;
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long long prev_state;
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char next_comm[TASK_COMM_LEN];
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int next_pid;
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int next_prio;
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};
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SEC("tracepoint/sched/sched_switch")
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int oncpu(struct sched_switch_args *ctx)
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{
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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