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8ab7a2b705
Only function traces can be exported to other destinations currently. This patch exports event trace as well. Move trace export related function to the beginning of file so other trace can call trace_process_export() to export. Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Link: https://lore.kernel.org/r/20201005071319.78508-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TRACE_H
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#define _LINUX_TRACE_H
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#ifdef CONFIG_TRACING
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#define TRACE_EXPORT_FUNCTION BIT(0)
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#define TRACE_EXPORT_EVENT BIT(1)
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/*
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* The trace export - an export of Ftrace output. The trace_export
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* can process traces and export them to a registered destination as
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* an addition to the current only output of Ftrace - i.e. ring buffer.
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*
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* If you want traces to be sent to some other place rather than ring
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* buffer only, just need to register a new trace_export and implement
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* its own .write() function for writing traces to the storage.
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*
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* next - pointer to the next trace_export
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* write - copy traces which have been delt with ->commit() to
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* the destination
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* flags - which ftrace to be exported
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*/
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struct trace_export {
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struct trace_export __rcu *next;
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void (*write)(struct trace_export *, const void *, unsigned int);
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int flags;
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};
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int register_ftrace_export(struct trace_export *export);
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int unregister_ftrace_export(struct trace_export *export);
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struct trace_array;
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void trace_printk_init_buffers(void);
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int trace_array_printk(struct trace_array *tr, unsigned long ip,
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const char *fmt, ...);
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int trace_array_init_printk(struct trace_array *tr);
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void trace_array_put(struct trace_array *tr);
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struct trace_array *trace_array_get_by_name(const char *name);
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int trace_array_destroy(struct trace_array *tr);
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#endif /* CONFIG_TRACING */
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#endif /* _LINUX_TRACE_H */
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