[PATCH v4 0/8] Add VM kernel tracing over vsock sockets

[Slavomir Kaslev <kaslevs@vmware.com>]

This patchset adds support for tracing guest kernels to trace-cmd.

Changes in v4:
 - detect and use splice(2) on vsock sockets if possible
 - switch port numbers to unsigned int
 - trace-cmd record --date flag is now set for all guests if provided by the user
 - removed grow_cap and exponential buffer size growth

Changes in v3:
 - addressed Steven's feedback
 - detect and disable guest tracing if <linux/vm_sockets.h> is not available
 - the --date flag is now treated as global for all guest instances
 - fixed a bug that caused --date to be ignored for host tracing data when tracing guests

Changes in v2:
 - rebased on top of protocol V3
 - fixed system clock timestamps with the --date flag

Slavomir Kaslev (6):
  trace-cmd: Minor refactoring
  trace-cmd: Add tracecmd_create_recorder_virt function
  trace-cmd: Add TRACE_REQ and TRACE_RESP messages
  trace-cmd: Add buffer instance flags for tracing in guest and agent
    context
  trace-cmd: Add VM kernel tracing over vsock sockets transport
  trace-cmd: Use splice(2) for vsock sockets if available

Steven Rostedt (VMware) (1):
  trace-cmd: Detect if vsock sockets are available

Tzvetomir Stoyanov (1):
  trace-cmd: Use unsigned int for trace-cmd client ports

 Makefile                       |   7 +
 include/trace-cmd/trace-cmd.h  |  17 +-
 lib/trace-cmd/trace-recorder.c |  53 ++-
 tracecmd/Makefile              |   6 +-
 tracecmd/include/trace-local.h |  18 +
 tracecmd/trace-agent.c         | 230 ++++++++++
 tracecmd/trace-cmd.c           |   3 +
 tracecmd/trace-msg.c           | 210 ++++++++-
 tracecmd/trace-record.c        | 803 +++++++++++++++++++++++++++++----
 tracecmd/trace-usage.c         |  13 +-
 10 files changed, 1243 insertions(+), 117 deletions(-)
 create mode 100644 tracecmd/trace-agent.c

-- 
2.19.1