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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

4
net/filter-rewriter.c
View file

@ -69,7 +69,7 @@ static int handle_primary_tcp_pkt(NetFilterState *nf,
struct tcphdr *tcp_pkt;
tcp_pkt = (struct tcphdr *)pkt->transport_header;
if (trace_event_get_state(TRACE_COLO_FILTER_REWRITER_DEBUG)) {
if (trace_event_get_state_backends(TRACE_COLO_FILTER_REWRITER_DEBUG)) {
trace_colo_filter_rewriter_pkt_info(__func__,
inet_ntoa(pkt->ip->ip_src), inet_ntoa(pkt->ip->ip_dst),
ntohl(tcp_pkt->th_seq), ntohl(tcp_pkt->th_ack),
@ -115,7 +115,7 @@ static int handle_secondary_tcp_pkt(NetFilterState *nf,
tcp_pkt = (struct tcphdr *)pkt->transport_header;
if (trace_event_get_state(TRACE_COLO_FILTER_REWRITER_DEBUG)) {
if (trace_event_get_state_backends(TRACE_COLO_FILTER_REWRITER_DEBUG)) {
trace_colo_filter_rewriter_pkt_info(__func__,
inet_ntoa(pkt->ip->ip_src), inet_ntoa(pkt->ip->ip_dst),
ntohl(tcp_pkt->th_seq), ntohl(tcp_pkt->th_ack),