On Wed, Dec 21, 2011 at 3:35 PM, Stefan Hajnoczi <stefa...@linux.vnet.ibm.com> wrote:
Ping? Do you want to take this through the block tree? > It can be useful to enable QEMU tracing when trying out block layer > interfaces via qemu-io. Tracing can be enabled using the new -t FILE > option where the given file contains a list of trace events to enable > (just like the qemu --trace events=FILE option). > > $ echo qemu_vfree >my-events > $ ./qemu-io -t my-events ... > > Remember to use ./configure --enable-trace-backend=BACKEND when building > qemu-io. > > Signed-off-by: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com> > --- > qemu-io.c | 8 +++++++- > 1 files changed, 7 insertions(+), 1 deletions(-) > > diff --git a/qemu-io.c b/qemu-io.c > index ffa62fb..ad91fd6 100644 > --- a/qemu-io.c > +++ b/qemu-io.c > @@ -17,6 +17,7 @@ > #include "qemu-common.h" > #include "block_int.h" > #include "cmd.h" > +#include "trace/control.h" > > #define VERSION "0.0.1" > > @@ -1722,6 +1723,7 @@ static void usage(const char *name) > " -g, --growable allow file to grow (only applies to protocols)\n" > " -m, --misalign misalign allocations for O_DIRECT\n" > " -k, --native-aio use kernel AIO implementation (on Linux only)\n" > +" -t, --trace FILE enable trace events listed in the given file\n" > " -h, --help display this help and exit\n" > " -V, --version output version information and exit\n" > "\n", > @@ -1733,7 +1735,7 @@ int main(int argc, char **argv) > { > int readonly = 0; > int growable = 0; > - const char *sopt = "hVc:rsnmgk"; > + const char *sopt = "hVc:rsnmgkt:"; > const struct option lopt[] = { > { "help", 0, NULL, 'h' }, > { "version", 0, NULL, 'V' }, > @@ -1745,6 +1747,7 @@ int main(int argc, char **argv) > { "misalign", 0, NULL, 'm' }, > { "growable", 0, NULL, 'g' }, > { "native-aio", 0, NULL, 'k' }, > + { "trace", 1, NULL, 't' }, > { NULL, 0, NULL, 0 } > }; > int c; > @@ -1776,6 +1779,9 @@ int main(int argc, char **argv) > case 'k': > flags |= BDRV_O_NATIVE_AIO; > break; > + case 't': > + trace_backend_init(optarg, NULL); > + break; > case 'V': > printf("%s version %s\n", progname, VERSION); > exit(0); > -- > 1.7.7.3 > >