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trace: Add trace file name command-line option

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This patch adds an optional command line switch '-trace' to specify the
filename to write traces to, when qemu starts.
Eg, If compiled with the 'simple' trace backend,
[temp@system]$ qemu -trace FILENAME IMAGE
Allows the binary traces to be written to FILENAME instead of the option
set at config-time.

Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Prerna Saxena 2010-08-09 11:48:32 +01:00 committed by Anthony Liguori
parent c5ceb523fa
commit ab6540d55e
3 changed files with 50 additions and 0 deletions
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18
qemu-config.c
View File

@ -288,6 +288,21 @@ static QemuOptsList qemu_mon_opts = {
},
};
#ifdef CONFIG_SIMPLE_TRACE
static QemuOptsList qemu_trace_opts = {
.name = "trace",
.implied_opt_name = "trace",
.head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
.desc = {
{
.name = "file",
.type = QEMU_OPT_STRING,
},
{ /* end if list */ }
},
};
#endif
static QemuOptsList qemu_cpudef_opts = {
.name = "cpudef",
.head = QTAILQ_HEAD_INITIALIZER(qemu_cpudef_opts.head),
@ -346,6 +361,9 @@ static QemuOptsList *vm_config_groups[32] = {
&qemu_global_opts,
&qemu_mon_opts,
&qemu_cpudef_opts,
#ifdef CONFIG_SIMPLE_TRACE
&qemu_trace_opts,
#endif
NULL,
};

11
qemu-options.hx
View File

@ -2230,6 +2230,17 @@ Normally QEMU loads a configuration file from @var{sysconfdir}/qemu.conf and
@var{sysconfdir}/target-@var{ARCH}.conf on startup. The @code{-nodefconfig}
option will prevent QEMU from loading these configuration files at startup.
ETEXI
#ifdef CONFIG_SIMPLE_TRACE
DEF("trace", HAS_ARG, QEMU_OPTION_trace,
"-trace\n"
" Specify a trace file to log traces to\n",
QEMU_ARCH_ALL)
STEXI
@item -trace
@findex -trace
Specify a trace file to log output traces to.
ETEXI
#endif
HXCOMM This is the last statement. Insert new options before this line!
STEXI

21
vl.c
View File

@ -47,6 +47,10 @@
#include <dirent.h>
#include <netdb.h>
#include <sys/select.h>
#ifdef CONFIG_SIMPLE_TRACE
#include "trace.h"
#endif
#ifdef CONFIG_BSD
#include <sys/stat.h>
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
@ -1823,6 +1827,9 @@ int main(int argc, char **argv, char **envp)
int show_vnc_port = 0;
int defconfig = 1;
#ifdef CONFIG_SIMPLE_TRACE
const char *trace_file = NULL;
#endif
atexit(qemu_run_exit_notifiers);
error_set_progname(argv[0]);
@ -2595,6 +2602,14 @@ int main(int argc, char **argv, char **envp)
}
xen_mode = XEN_ATTACH;
break;
#ifdef CONFIG_SIMPLE_TRACE
case QEMU_OPTION_trace:
opts = qemu_opts_parse(qemu_find_opts("trace"), optarg, 0);
if (opts) {
trace_file = qemu_opt_get(opts, "file");
}
break;
#endif
case QEMU_OPTION_readconfig:
{
int ret = qemu_read_config_file(optarg);
@ -2638,6 +2653,12 @@ int main(int argc, char **argv, char **envp)
data_dir = CONFIG_QEMU_DATADIR;
}
#ifdef CONFIG_SIMPLE_TRACE
/*
* Set the trace file name, if specified.
*/
st_set_trace_file(trace_file);
#endif
/*
* Default to max_cpus = smp_cpus, in case the user doesn't
* specify a max_cpus value.