22890ab5e8
This patch adds support for dynamically enabling/disabling of trace events. This is done by internally maintaining each trace event's state, and permitting logging of data from a trace event only if it is in an 'active' state. Monitor commands added : 1) info trace-events : to view all available trace events and their state. 2) trace-event NAME on|off : to enable/disable data logging from a given trace event. Eg, trace-event paio_submit off disables logging of data when paio_submit is hit. By default, all trace-events are disabled. One can enable desired trace-events via the monitor. Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> trace: Monitor command 'info trace' Monitor command 'info trace' to display contents of trace buffer Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> trace: Remove monitor.h dependency from simpletrace User-mode targets don't have a monitor so the simple trace backend currently does not build on those targets. This patch abstracts the monitor printing interface so there is no direct coupling between simpletrace and the monitor. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
37 lines
1.2 KiB
C
37 lines
1.2 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 SIMPLETRACE_H
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#define SIMPLETRACE_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 trace0(TraceEventID event);
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void trace1(TraceEventID event, uint64_t x1);
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void trace2(TraceEventID event, uint64_t x1, uint64_t x2);
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void trace3(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3);
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void trace4(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4);
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void trace5(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5);
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void trace6(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5, uint64_t x6);
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void st_print_trace(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...));
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void st_print_trace_events(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...));
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void st_change_trace_event_state(const char *tname, bool tstate);
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#endif /* SIMPLETRACE_H */
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