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62bab73213
Existing simpletrace backend allows to trace at max 6 args and does not support strings. This newer tracelog format gets rid of fixed size records and therefore allows to trace variable number of args including strings. Sample trace with strings: v9fs_version 0.000 tag=0xffff id=0x64 msize=0x2000 version=9P2000.L v9fs_version_return 6.705 tag=0xffff id=0x64 msize=0x2000 version=9P2000.L Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* Simple trace backend
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*
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* Copyright IBM, Corp. 2010
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef TRACE_SIMPLE_H
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#define TRACE_SIMPLE_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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typedef uint64_t TraceEventID;
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typedef struct {
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const char *tp_name;
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bool state;
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} TraceEvent;
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void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
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void st_set_trace_file_enabled(bool enable);
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bool st_set_trace_file(const char *file);
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void st_flush_trace_buffer(void);
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typedef struct {
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unsigned int tbuf_idx;
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unsigned int next_tbuf_idx;
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unsigned int rec_off;
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} TraceBufferRecord;
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/* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */
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#define MAX_TRACE_STRLEN 512
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/**
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* Initialize a trace record and claim space for it in the buffer
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*
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* @arglen number of bytes required for arguments
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*/
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int trace_record_start(TraceBufferRecord *rec, TraceEventID id, size_t arglen);
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/**
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* Append a 64-bit argument to a trace record
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*/
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void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val);
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/**
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* Append a string argument to a trace record
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*/
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void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen);
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/**
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* Mark a trace record completed
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*
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* Don't append any more arguments to the trace record after calling this.
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*/
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void trace_record_finish(TraceBufferRecord *rec);
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#endif /* TRACE_SIMPLE_H */
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