[dpdk-dev] [PATCH v3 00/33] DPDK Trace support
jerinj at marvell.com
jerinj at marvell.com
Sun Mar 29 16:43:09 CEST 2020
From: Jerin Jacob <jerinj at marvell.com>
v3:
~~
1) Fix the following build issues reported by CI
http://mails.dpdk.org/archives/test-report/2020-March/122060.html
a) clang + i686 meson build issue(Fixed in the the patch meson: add libatomic as a global dependency for i686 clang)
b) fixed build issue with FreeBSD with top of tree change.
c) fixed missing experimental API for iavf and ice with meson build in avx512 files.
v2:
~~
Addressed the following review comments from Mattias Rönnblom:
1) Changed
from:
typedef uint64_t* rte_trace_t;
to
typedef uint64_t rte_trace_t;
Initially thought to make the handle as
struct rte_trace {
uint64_t val;
}
but changed to uint64_t for the following reasons
a) It is opaque to the application and it will fix the compile-time type
check as well.
b) The handle has an index that will point to an internal slow-path
structure so no ABI change required in the future.
c) RTE_TRACE_POINT_DEFINE need to expose trace object. So it is better
to keep as uint64_t and avoid one more indirection for no use.
2)
Changed:
from:
enum rte_trace_mode_e {
to:
enum rte_trace_mode {
3) removed [out] "found" param from rte_trace_pattern() and
rte_trace_regexp()
4) Changed rte_trace_from_name to rte_trace_by_name
5) rte_trace_is_dp_enabled() return bool now
6) in __rte_trace_point_register() the argument fn change to register_fn
7) removed !! from rte_trace_is_enabled()
8) Remove uninitialized "rc warning" from rte_trace_pattern() and
rte_trace_regexp()
9) fixup bool return type for trace_entry_compare()
10) fixup calloc casting in trace_mkdir()
11) check fclose() return in trace_meta_save() and trace_mem_save()
12) rte_trace_ctf_* macro cleanup
13) added release notes
14) fix build issues reported by CI
http://mails.dpdk.org/archives/test-report/2020-March/121235.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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# 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
Pavan Nikhilesh (1):
meson: add libatomic as a global dependency for i686 clang
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_mempool/rte_mempool_version.map | 26 +
lib/librte_mempool/rte_trace_mempool.h | 148 +++++
lib/librte_mempool/rte_trace_mempool_fp.h | 102 +++
lib/librte_port/Makefile | 1 +
lib/librte_port/meson.build | 1 +
lib/librte_rcu/meson.build | 5 -
lib/librte_reorder/Makefile | 1 +
lib/librte_reorder/meson.build | 1 +
lib/librte_sched/Makefile | 1 +
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 +
266 files changed, 6286 insertions(+), 113 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
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