[dpdk-dev] [PATCH v1 00/32] DPDK Trace support

[<jerinj@marvell.com>]

From: Jerin Jacob <jerinj@marvell.com>

It is the v1 version of the DPDK trace support based on the following RFC

https://www.mail-archive.com/dev@dpdk.org/msg154457.html

This patch set contains 
~~~~~~~~~~~~~~~~~~~~~~~~

# The native implementation of common trace format(CTF)[1] based tracer
# Public API to create the trace points.
# Add tracepoints to eal, ethdev, mempool, eventdev and cryptodev 
library for tracing support
# A unit test case
# Performance test case to measure the trace overhead. (See eal/trace:
# add trace performance test cases, patch)
# Programmers guide for Trace support(See doc: add trace library guide,
# patch)

# Tested OS:
~~~~~~~~~~~
- Linux
- FreeBSD

# Tested open source CTF trace viewers
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Babeltrace
- Tracecompass

# Trace overhead comparison with LTTng
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

trace overhead data on x86:[2]
# 236 cycles with LTTng(>100ns)
# 18 cycles(7ns) with Native DPDK CTF emitter.(See eal/trace: add trace
# performance test cases patch)

trace overhead data on arm64:
#  312  cycles to  1100 cycles with LTTng based on the class of arm64
#  CPU.
#  11 cycles to 13 cycles with Native DPDK CTF emitter based on the
class of arm64 CPU.

18 cycles(on x86) vs 11 cycles(on arm64) is due to rdtsc() overhead in
x86. It seems  rdtsc takes around 15cycles in x86.


Items that needs to be sort it out 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Checkpatch script reports errors for macros which emit events.

	Library exports set of macros(rte_trace_ctf_*) to emit events
for various datatypes.
	Checkpatch scripts reports error for these macros, to be part of
EXPERIMENTAL section,
	even symbols are updated in EXPERIMENTAL section in
rte_eal_version.map file.
	
# Makefile and meson.build are updated to allow experimental APIs.

	As multiple EXPERIMENTAL symbols, exported by trace library, are
used in various
	drivers, lib, app and examples. So to fix compilation
warning/error, Makefile and
	meson.build are updated for all required components to support
EXPERIMENTAL APIs.
	It results same code changes at multiple components as well as
increases source
	code line changes in patchset too.
	Suggestions are welcome to resolve this issue with lesser code
changes
	
More details:
~~~~~~~~~~~~~

# The Native DPDK CTF trace support does not have any dependency on
third-party library.
The generated output file is compatible with LTTng as both are using
CTF trace format.

The performance gain comes from:
1) exploit dpdk worker thread usage model to avoid atomics and use per
core variables
2) use hugepage,
3) avoid a lot function pointers in fast-path etc
4) avoid unaligned store for arm64 etc

Features:
~~~~~~~~~
- APIs and Features are similar to rte_log dynamic framework
API(expect log prints on stdout vs it dumps on trace file)
- No specific limit on the events. A string-based event like rte_log
for pattern matching
- Dynamic enable/disable support.
- Instructmention overhead is ~1 cycle. i.e cost of adding the code
wth out using trace feature.
- Timestamp support for all the events using DPDK rte_rtdsc
- No dependency on another library. Clean room native implementation of
  CTF.

Functional test case:
a) echo "trace_autotest" | sudo ./build/app/test/dpdk-test  -c 0x3
--trace-level=8

The above command emits the following trace events
<code>
        uint8_t i;

        rte_trace_lib_eal_generic_void();
        rte_trace_lib_eal_generic_u64(0x10000000000000);
        rte_trace_lib_eal_generic_u32(0x10000000);
        rte_trace_lib_eal_generic_u16(0xffee);
        rte_trace_lib_eal_generic_u8(0xc);
        rte_trace_lib_eal_generic_i64(-1234);
        rte_trace_lib_eal_generic_i32(-1234567);
        rte_trace_lib_eal_generic_i16(12);
        rte_trace_lib_eal_generic_i8(-3);
        rte_trace_lib_eal_generic_string("my string");
        rte_trace_lib_eal_generic_function(__func__);

        for (i = 0; i < 128; i++)
                rte_trace_lib_eal_generic_u8(i);
</code>

Install babeltrace package in Linux and point the generated trace file
to babel trace. By default trace file created under
<user>/dpdk-traces/time_stamp/

example:
# babeltrace /root/dpdk-traces/rte-2020-02-15-PM-02-56-51 | more

[13:27:36.138468807] (+?.?????????) lib.eal.generic.void: { cpu_id =
0, name = "dpdk-test" }, { }
[13:27:36.138468851] (+0.000000044) lib.eal.generic.u64: { cpu_id = 0,
name = "dpdk-test" }, { in = 4503599627370496 }
[13:27:36.138468860] (+0.000000009) lib.eal.generic.u32: { cpu_id = 0,
name = "dpdk-test" }, { in = 268435456 }
[13:27:36.138468934] (+0.000000074) lib.eal.generic.u16: { cpu_id = 0,
name = "dpdk-test" }, { in = 65518 }
[13:27:36.138468949] (+0.000000015) lib.eal.generic.u8: { cpu_id = 0,
name = "dpdk-test" }, { in = 12 }
[13:27:36.138468956] (+0.000000007) lib.eal.generic.i64: { cpu_id = 0,
name = "dpdk-test" }, { in = -1234 }
[13:27:36.138468963] (+0.000000007) lib.eal.generic.i32: { cpu_id = 0,
name = "dpdk-test" }, { in = -1234567 }
[13:27:36.138469024] (+0.000000061) lib.eal.generic.i16: { cpu_id = 0,
name = "dpdk-test" }, { in = 12 }
[13:27:36.138469044] (+0.000000020) lib.eal.generic.i8: { cpu_id = 0,
name = "dpdk-test" }, { in = -3 }
[13:27:36.138469051] (+0.000000007) lib.eal.generic.string: { cpu_id =
0, name = "dpdk-test" }, { str = "my string" }
[13:27:36.138469203] (+0.000000152) lib.eal.generic.func: { cpu_id =
0, name = "dpdk-test" }, { func = "test_trace_points" }
[13:27:36.138469239] (+0.000000036) lib.eal.generic.u8: { cpu_id = 0,
name = "dpdk-test" }, { in = 0 }
[13:27:36.138469246] (+0.000000007) lib.eal.generic.u8: { cpu_id = 0,
name = "dpdk-test" }, { in = 1 }
[13:27:36.138469252] (+0.000000006) lib.eal.generic.u8: { cpu_id = 0,
name = "dpdk-test" }, { in = 2 }
[13:27:36.138469262] (+0.000000010) lib.eal.generic.u8: { cpu_id = 0,
name = "dpdk-test" }, { in = 3 }
[13:27:36.138469269] (+0.000000007) lib.eal.generic.u8: { cpu_id = 0,
name = "dpdk-test" }, { in = 4 }
[13:27:36.138469276] (+0.000000007) lib.eal.generic.u8: { cpu_id = 0,
name = "dpdk-test" }, { in = 5 }

# There is a  GUI based trace viewer available in Windows, Linux and
# Mac.
It is called as tracecompass.(https://www.eclipse.org/tracecompass/)

The example screenshot and Histogram of above DPDK trace using
Tracecompass.

https://github.com/jerinjacobk/share/blob/master/dpdk_trace.JPG



File walk through:
~~~~~~~~~~~~~~~~~~

lib/librte_eal/common/include/rte_trace.h - Public API for Trace
provider and Trace control
lib/librte_eal/common/eal_common_trace.c - main trace implementation
lib/librte_eal/common/eal_common_trace_ctf.c - CTF metadata spec
implementation
lib/librte_eal/common/eal_common_trace_utils.c - command line utils
and filesystem operations.
lib/librte_eal/common/eal_common_trace_points.c -  trace points for EAL
library
lib/librte_eal/common/include/rte_trace_eal.h - EAL tracepoint public
API.
lib/librte_eal/common/eal_trace.h - Private trace header file.


[1] https://diamon.org/ctf/

[2] The above test is ported to LTTng for finding the LTTng trace
overhead. It available at
https://github.com/jerinjacobk/lttng-overhead
https://github.com/jerinjacobk/lttng-overhead/blob/master/README

Jerin Jacob (21):
  eal: introduce API for getting thread name
  eal: define the public API for trace support
  eal/trace: implement trace register API
  eal/trace: implement trace operation APIs
  eal/trace: add internal trace init and fini interface
  eal/trace: get bootup timestamp for trace
  eal/trace: create CTF TDSL metadata in memory
  eal/trace: implement trace memory allocation
  eal/trace: implement debug dump function
  eal/trace: implement trace save
  eal/trace: implement registration payload
  eal/trace: implement provider payload
  eal/trace: hook internal trace APIs to Linux
  eal/trace: hook internal trace APIs to FreeBSD
  eal/trace: add generic tracepoints
  eal/trace: add alarm tracepoints
  eal/trace: add memory tracepoints
  eal/trace: add memzone tracepoints
  eal/trace: add thread tracepoints
  eal/trace: add interrupt tracepoints
  eal/trace: add trace performance test cases

Sunil Kumar Kori (11):
  eal/trace: handle CTF keyword collision
  eal/trace: add trace level configuration parameter
  eal/trace: add trace dir configuration parameter
  eal/trace: add trace bufsize configuration parameter
  eal/trace: add trace mode configuration parameter
  eal/trace: add unit test cases
  ethdev: add tracepoints
  eventdev: add tracepoints
  cryptodev: add tracepoints
  mempool: add tracepoints
  doc: add trace library guide

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 lib/librte_sched/meson.build                  |   1 +
 lib/librte_security/Makefile                  |   1 +
 lib/librte_security/meson.build               |   1 +
 lib/librte_table/Makefile                     |   1 +
 lib/librte_table/meson.build                  |   1 +
 258 files changed, 6276 insertions(+), 88 deletions(-)
 create mode 100644 app/test/test_trace.c
 create mode 100644 app/test/test_trace.h
 create mode 100644 app/test/test_trace_perf.c
 create mode 100644 app/test/test_trace_register.c
 create mode 100644 doc/guides/prog_guide/trace_lib.rst
 create mode 100644 lib/librte_cryptodev/cryptodev_trace_points.c
 create mode 100644 lib/librte_cryptodev/rte_trace_cryptodev.h
 create mode 100644 lib/librte_cryptodev/rte_trace_cryptodev_fp.h
 create mode 100644 lib/librte_eal/common/eal_common_trace.c
 create mode 100644 lib/librte_eal/common/eal_common_trace_ctf.c
 create mode 100644 lib/librte_eal/common/eal_common_trace_points.c
 create mode 100644 lib/librte_eal/common/eal_common_trace_utils.c
 create mode 100644 lib/librte_eal/common/eal_trace.h
 create mode 100644 lib/librte_eal/common/include/rte_trace.h
 create mode 100644 lib/librte_eal/common/include/rte_trace_eal.h
 create mode 100644 lib/librte_eal/common/include/rte_trace_provider.h
 create mode 100644 lib/librte_eal/common/include/rte_trace_register.h
 create mode 100644 lib/librte_ethdev/ethdev_trace_points.c
 create mode 100644 lib/librte_ethdev/rte_trace_ethdev.h
 create mode 100644 lib/librte_ethdev/rte_trace_ethdev_fp.h
 create mode 100644 lib/librte_eventdev/eventdev_trace_points.c
 create mode 100644 lib/librte_eventdev/rte_trace_eventdev.h
 create mode 100644 lib/librte_eventdev/rte_trace_eventdev_fp.h
 create mode 100644 lib/librte_mempool/mempool_trace_points.c
 create mode 100644 lib/librte_mempool/rte_trace_mempool.h
 create mode 100644 lib/librte_mempool/rte_trace_mempool_fp.h

-- 
2.25.1