ef4c9fc854
The TraceEventID and TraceEventVCPUID enums constants are no longer actually used for anything critical. The TRACE_EVENT_COUNT limit is used to determine the size of the TraceEvents array, and can be removed if we just NULL terminate the array instead. The TRACE_VCPU_EVENT_COUNT limit is used as a magic value for marking non-vCPU events, and also for declaring the size of the trace dstate mask in the CPUState struct. The former usage can be replaced by a dedicated constant TRACE_EVENT_VCPU_NONE, defined as (uint32_t)-1. For the latter usage, we can simply define a constant for the number of VCPUs, avoiding the need for the full enum. The only other usages of the enum values can be replaced by accesing the id/vcpu_id fields via the named TraceEvent structs. Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 1475588159-30598-11-git-send-email-berrange@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
56 lines
1.3 KiB
C
56 lines
1.3 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 "trace/generated-events.h"
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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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void st_set_trace_file(const char *file);
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bool st_init(void);
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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 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, uint32_t 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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