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| author | Prerna Saxena <prerna@linux.vnet.ibm.com> | 2010-06-24 17:04:53 +0530 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2010-09-09 16:22:44 -0500 |
| commit | 22890ab5e825601f4c3d5a1a6b4197904e5d1fee (patch) | |
| tree | a2d75e9328a15bb4a0fc589015f8908f26b25282 /simpletrace.h | |
| parent | 26f7227bfe9a9abee3fe5190cbfc35dd876e06d9 (diff) | |
| download | qemu-22890ab5e825601f4c3d5a1a6b4197904e5d1fee.zip qemu-22890ab5e825601f4c3d5a1a6b4197904e5d1fee.tar.gz qemu-22890ab5e825601f4c3d5a1a6b4197904e5d1fee.tar.bz2 | |
trace: Support for dynamically enabling/disabling trace events
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>
Diffstat (limited to 'simpletrace.h')
| -rw-r--r-- | simpletrace.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/simpletrace.h b/simpletrace.h index 7d0661b..b0161d1 100644 --- a/simpletrace.h +++ b/simpletrace.h @@ -12,9 +12,16 @@ #define SIMPLETRACE_H #include <stdint.h> +#include <stdbool.h> +#include <stdio.h> typedef uint64_t TraceEventID; +typedef struct { + const char *tp_name; + bool state; +} TraceEvent; + void trace0(TraceEventID event); void trace1(TraceEventID event, uint64_t x1); void trace2(TraceEventID event, uint64_t x1, uint64_t x2); @@ -22,5 +29,8 @@ void trace3(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3); void trace4(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4); void trace5(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5); void trace6(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5, uint64_t x6); +void st_print_trace(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...)); +void st_print_trace_events(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...)); +void st_change_trace_event_state(const char *tname, bool tstate); #endif /* SIMPLETRACE_H */ |