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trace: add trace_event_get_state_backends()

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Code that checks dstate is unaware of SystemTap and LTTng UST dstate, so
the following trace event will not fire when solely enabled by SystemTap
or LTTng UST:

  if (trace_event_get_state(TRACE_MY_EVENT)) {
      str = g_strdup_printf("Expensive string to generate ...",
                            ...);
      trace_my_event(str);
      g_free(str);
  }

Add trace_event_get_state_backends() to fetch backend dstate.  Those
backends that use QEMU dstate fetch it as part of
generate_h_backend_dstate().

Update existing trace_event_get_state() callers to use
trace_event_get_state_backends() instead.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170731140718.22010-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-07-31 15:07:18 +01:00
parent 3932ef3ffb
commit d87aa13803
5 changed files with 31 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

13
hw/usb/hcd-ohci.c
View file

@ -936,16 +936,18 @@ static int ohci_service_iso_td(OHCIState *ohci, struct ohci_ed *ed,
return 1;
}
#ifdef trace_event_get_state
static void ohci_td_pkt(const char *msg, const uint8_t *buf, size_t len)
{
bool print16 = !!trace_event_get_state(TRACE_USB_OHCI_TD_PKT_SHORT);
bool printall = !!trace_event_get_state(TRACE_USB_OHCI_TD_PKT_FULL);
bool print16;
bool printall;
const int width = 16;
int i;
char tmp[3 * width + 1];
char *p = tmp;
print16 = !!trace_event_get_state_backends(TRACE_USB_OHCI_TD_PKT_SHORT);
printall = !!trace_event_get_state_backends(TRACE_USB_OHCI_TD_PKT_FULL);
if (!printall && !print16) {
return;
}
@ -967,11 +969,6 @@ static void ohci_td_pkt(const char *msg, const uint8_t *buf, size_t len)
p += sprintf(p, " %.2x", buf[i]);
}
}
#else
static void ohci_td_pkt(const char *msg, const uint8_t *buf, size_t len)
{
}
#endif
/* Service a transport descriptor.
Returns nonzero to terminate processing of this endpoint. */