This patchset adds support for tracing guest kernels to trace-cmd.
The first two patches in the series are minor cleanups which can be merged
separately.
Changes in v7:
- fixed potential memory leak in add_arg()
- call msg_free() in tracecmd_msg_recv_trace_req() eventhough we're stealing
the message buffer
- added is_guest and is_agent macros and use throughout tracecmd_record.c
instead of testing instance->flags bits
- avoid memory allocation in make_dir()
Changes in v6:
- added specialized data transfer path over FIFOs making single splice() per
iteration
- made tracecmd_msg_recv_trace_req/tracecmd_msg_recv_trace_resp more defensive
to invalid messages
Changes in v5:
- add FIFOs transport for tracing data
- fixed a bug in tracecmd_msg_wait_close
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 (12):
trace-cmd: Minor cleanup in tracecmd_start_recording()
trace-cmd: Minor cleanup in print_stat()
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 vsockets transport
trace-cmd: Use splice(2) for vsockets if available
trace-cmd: Add `trace-cmd setup-guest` command
trace-cmd: Try to autodetect number of guest CPUs in setup-guest if
not specified
trace-cmd: Add setup-guest flag for attaching FIFOs to the guest VM
config
trace-cmd: Add splice() recording from FIFO without additional pipe
buffer
trace-cmd: Add VM tracing over FIFOs transport
Steven Rostedt (VMware) (1):
trace-cmd: Detect if vsockets are available
Makefile | 7 +
include/trace-cmd/trace-cmd.h | 16 +-
lib/trace-cmd/trace-recorder.c | 140 ++++--
tracecmd/Makefile | 7 +-
tracecmd/include/trace-local.h | 29 ++
tracecmd/trace-agent.c | 257 +++++++++++
tracecmd/trace-cmd.c | 4 +
tracecmd/trace-msg.c | 219 ++++++++-
tracecmd/trace-record.c | 779 ++++++++++++++++++++++++++++++---
tracecmd/trace-setup-guest.c | 245 +++++++++++
tracecmd/trace-usage.c | 22 +-
11 files changed, 1637 insertions(+), 88 deletions(-)
create mode 100644 tracecmd/trace-agent.c
create mode 100644 tracecmd/trace-setup-guest.c
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2.19.1
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