is welcome!
Project website: https://lttng.org
Documentation: https://lttng.org/docs
Download link: https://lttng.org/download
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d by the
time the CTF2 specification was finalized:
- https://diamon.org/ctf/files/CTF2-BASICATTRS-1.0.html
- https://diamon.org/ctf/files/CTF2-PMETA-1.0.html
As always, feedback is welcome!
Thanks,
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[1] https://github.com/open-telemetry/opentelemetry-specification/issues/3979
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ptor leak has been detected: 1 tracked file
descriptors are still being tracked/
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t;>
>> ___
>> lttng-dev mailing list
>> lttng-dev@lists.lttng.org <mailto:lttng-dev@lists.lttng.org>
>> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
<https://lists.lttng.org/cgi-bin/ma
on EL 8.4+
* Fix: support ext4_journal_start on EL 8.4+
* Fix: correct RHEL range for kmem_cache_free define
Project website: https://lttng.org
Documentation: https://lttng.org/docs
Download link: https://lttng.org/download
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On 2024-05-02 10:32, Michael Jeanson wrote:
On 2024-05-02 09:54, Mathieu Desnoyers wrote:
On 2024-05-01 19:42, Benjamin Marzinski via lttng-dev wrote:
If the read() in get_cpu_mask_from_sysfs() fails with EINTR, the code is
supposed to retry, but the while loop condition has (bytes_read >
* Make sure the mask read is a null terminated string.
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e_bytes, 0,
new_chunk_size_bytes - old_chunk_size_bytes);
last_chunk->capacity = new_capacity;
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with linux 6.6
* docs: Add supported versions and fix-backport policy
* docs: Add links to project resources
* Fix: Correct minimum version in jbd2 SLE kernel range
* Fix: Handle recent SLE major version codes
* Fix: build on sles15sp4
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On 2024-02-23 09:26, Steven Rostedt wrote:
On Mon, 19 Feb 2024 13:01:16 -0500
Mathieu Desnoyers wrote:
Between "sched_process_exit" and "sched_process_free", the task can still be
observed by a trace analysis looking at sched and signal events: it's a zombie
at
t
On 2024-01-15 14:42, Florian Weimer wrote:
* Mathieu Desnoyers:
[...]
General use of lttng should be fine, I think, only the malloc wrapper
has this problem.
The purpose of the nesting counter TLS variable in the malloc wrapper
is to catch situations like this where a global-dynamic TLS
th glibc could avoid this issue,
and also help with the longjmp problem, and fix setcontext/swapcontext,
too.
Thanks,
Florian
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Import VFS namespace for android common kernel
* Fix build for RHEL 8.8 with linux 4.18.0-477.10.1+
* Fix: bytecode validator: oops during validation of immediate string
* fix: ubuntu kinetic kernel range for jdb2
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x: python agent: install on Debian python >= 3.10
* fix: python agent: Add a dependency on generated files
* python: use setuptools with python >= 3.12
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lt
)
EXPORT_SYMBOL_GPL(wrapper_kallsyms_lookup_name);
#endif
+
+#ifdef CONFIG_ANDROID
+MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);
+#endif
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rcu/+/10911/1>. That ought to fix
the issue until we merge the patch.
Fix merged into liburcu master, thanks!
Mathieu
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up on our customer's
feature requirement radar yet.
Also, are there any recent docs to share regarding tracepoint latency?
There is a Polytechnique student who extensively analyzed this recently.
Michel, do you have a pointer to his work ?
Thanks,
Mathieu
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On 8/23/23 10:47, Paul E. McKenney wrote:
On Mon, Aug 21, 2023 at 11:43:32AM -0400, Mathieu Desnoyers wrote:
On 8/15/23 08:38, Mathieu Desnoyers via lttng-dev wrote:
On 8/14/23 17:05, Olivier Dion via lttng-dev wrote:
After discussing it with Mathieu, we agree on the following 3 phases
On 8/15/23 08:38, Mathieu Desnoyers via lttng-dev wrote:
On 8/14/23 17:05, Olivier Dion via lttng-dev wrote:
After discussing it with Mathieu, we agree on the following 3 phases for
deprecating the signal flavor:
1) liburcu-signal will be implemented in term of liburcu-mb. The only
an existing shared object, therefore I'm not even sure we need to
bump the soname for all the other remaining shared objects.
Thanks,
Mathieu
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file"
+
+if awk "BEGIN {exit !(${kernel_version} >= 6.1)}"; then
+ echo 'obj-y += lttng/' >> "${KERNEL_DIR}/Kbuild"
+else
+ sed -i 's#+= kernel/#+= kernel/ lttng/#' "${KERNEL_DIR}/Makefile"
+fi
echo >&2
echo "$0: done."
-bin/mailman/listinfo/lttng-dev
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prototype! Please
don't hesitate to reach out to EfficiOS if HPE would like to explore
supporting this project.
Mathieu
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all copies of this message. KPIT Technologies Ltd. does not
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h
a versioned kernel ABI without different semantics
across kernel flavors, but considering the current situation we will
need to deal with this with scripts as we have done for other distributions.
Thanks,
Mathieu
All the best, Roxana
On 04/07/2023 20:07, Mathieu Desnoyers wrote:
On 7/4/23 11
,
Michael
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On 6/29/23 13:22, Olivier Dion wrote:
On Thu, 22 Jun 2023, "Paul E. McKenney" wrote:
On Thu, Jun 22, 2023 at 11:55:55AM -0400, Mathieu Desnoyers wrote:
On 6/21/23 19:19, Paul E. McKenney wrote:
I suggest C11 volatile atomic load/store. Load/store fusing is permitted
for non-volat
le useless.
Thanks,
Mathieu
However, I do not find any simple reproducer of load/store fusing. Do
you have example of such fusing, or is this a precaution? In the
meantime, back to reading the standard to be certain :-)
[0] https://godbolt.org/z/odKG9a75a
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On 6/22/23 14:32, Paul E. McKenney wrote:
On Thu, Jun 22, 2023 at 11:55:55AM -0400, Mathieu Desnoyers wrote:
On 6/21/23 19:19, Paul E. McKenney wrote:
[...]
diff --git a/include/urcu/uatomic/builtins-generic.h
b/include/urcu/uatomic/builtins-generic.h
new file mode 100644
index 000
Thanx, Paul
+
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ntainer_of(cds_lfht_iter_get_node(iter), \
+ __typeof__(*(pos)), member) : NULL))
#ifdef __cplusplus
}
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ly decides to use a thread fence there to make it
similar to the rest of the code in the future.
Thanks,
Mathieu
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On 6/20/23 18:02, Brian Hutchinson wrote:
On Thu, May 11, 2023 at 2:14 PM Mathieu Desnoyers
wrote:
On 2023-05-11 14:13, Mathieu Desnoyers via lttng-dev wrote:
On 2023-05-11 12:36, Brian Hutchinson via lttng-dev wrote:
... more background. I've always used ltt in the kernel so I don't
have
On 6/21/23 01:39, Yitschak, Yehuda wrote:
On 6/20/23 10:20, Mathieu Desnoyers via lttng-dev wrote:
On 6/20/23 06:27, Mousa, Anas via lttng-dev wrote:
Hello,
Arethereanysuggestionstorootcausethehighlatencyandpotentiallyimproveito
n*platform1*?
Thanks and best regards,
Anas.
I
On 6/20/23 10:20, Mathieu Desnoyers via lttng-dev wrote:
On 6/20/23 06:27, Mousa, Anas via lttng-dev wrote:
Hello,
Arethereanysuggestionstorootcausethehighlatencyandpotentiallyimproveiton*platform1*?
Thanks and best regards,
Anas.
I recommend using "perf" wh
hot spots. With that information on the "fast" and
"slow" system, we might be able to figure out what differs.
Also, comparing the kernel configurations of the two systems can help.
Also comparing the glibc versions of the two systems would be relevant.
Thanks,
Mathieu
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bit
+ * that contains either zero or one. The cmm_barrier() ensures that the
accesses in
* _rcu_read_lock() happen before the subsequent read-side critical section.
*/
static inline void _urcu_signal_read_lock_update(unsigned long tmp)
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() nesting, and a single high-order bit that contains either
zero
* or URCU_GP_CTR_PHASE. The cmm_barrier() ensures that the accesses in
* _rcu_read_lock() happen before the subsequent read-side critical section.
*/
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: https://cvent.me/Gn0nkR (in-person, 80$),
https://cvent.me/xywylX (virtual).
For more info: https://tracingsummit.org/
The 2023 Tracing Summit is sponsored by EfficiOS and organized by Erica
Bugden (EfficiOS), Olivier Dion (EfficiOS), and Mathieu Desnoyers
(EfficiOS) on behalf of the Linux
e!
Thanks,
Mathieu
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On 2023-05-18 15:20, Brian Hutchinson wrote:
On Thu, May 18, 2023 at 3:07 PM Brian Hutchinson wrote:
On Thu, May 18, 2023 at 3:03 PM Mathieu Desnoyers
wrote:
On 2023-05-18 14:58, Brian Hutchinson wrote:
On Thu, May 18, 2023 at 11:00 AM Brian Hutchinson wrote:
On Thu, May 18, 2023 at 10
guaranteeing that whatever is instrumented with a tracepoint is indeed
available for tracing.
Also, double-check that the path you pass to --userspace-probe really
targets your executable or .so binary file, and is not just a symbolic link.
Thanks,
Mathieu
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On 2023-05-18 14:58, Brian Hutchinson wrote:
On Thu, May 18, 2023 at 11:00 AM Brian Hutchinson wrote:
On Thu, May 18, 2023 at 10:45 AM Mathieu Desnoyers
wrote:
On 2023-05-18 10:10, Brian Hutchinson wrote:
[...]
I updated my hello world to have a function I'd like to use the
--userspace
e-probe=/usr/local/bin/hello:probe_function my_probe_function
Where "my_probe_function" is the event name that will appear in the collected
traces.
Thanks,
Mathieu
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On 2023-05-17 12:37, Brian Hutchinson wrote:
On Wed, May 17, 2023 at 12:08 PM Mathieu Desnoyers
wrote:
On 2023-05-16 22:11, Brian Hutchinson via lttng-dev wrote:
Hi,
I'm trying to figure out how to use uprobes with lttng.
I can't use a normal uprobe for a line number just using the address
.
So we only support inserting uprobe on functions and SDT probes at
the moment.
Thanks,
Mathieu
Thanks,
Brian
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half of the Linux Foundation
Diagnostic and
Monitoring Workgroup [4].
The organizers of this event are Mathieu Desnoyers (EfficiOS), Erica Bugden
(EfficiOS)
and Olivier Dion (EfficiOS).
[0]: https://tracingsummit.org
[1]: https://events.linuxfoundation.org/open-source-summit-europe/
[2]: h
On 2023-05-12 10:52, Brian Hutchinson wrote:
Hi Mathieu,
On Fri, May 12, 2023 at 9:33 AM Mathieu Desnoyers
wrote:
On 2023-05-12 00:10, Brian Hutchinson wrote:
Hmm, I missed this earlier somehow.
So, I'm not the greatest at updating OE and Yocto recipes. I'm
currently using this recipe
[adding back the mailing list]
On 2023-05-12 09:33, Mathieu Desnoyers wrote:
On 2023-05-12 00:10, Brian Hutchinson wrote:
Hmm, I missed this earlier somehow.
So, I'm not the greatest at updating OE and Yocto recipes. I'm
currently using this recipe:
http://cgit.openembedded.org/openembedded
On 2023-05-11 14:13, Mathieu Desnoyers via lttng-dev wrote:
On 2023-05-11 12:36, Brian Hutchinson via lttng-dev wrote:
... more background. I've always used ltt in the kernel so I don't
have much experience with the user side of it and especially
multi-threaded, multi-core so I'm probably
/lttng-dev
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ix: kallsyms wrapper on ppc64el
I suspect you'll also need this change currently in review:
https://review.lttng.org/c/lttng-modules/+/9113
Please let us know if especially this last change fixes things on your side.
Thanks,
Mathieu
Regards,
Shashank
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ormation, is there a specific annotation that would make sense ?
Thanks,
Mathieu
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Oh boy...
Ondrej
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://lists.lttng.org/pipermail/lttng-dev/2023-March/030358.html
Thanks,
Mathieu
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16.0.0 -O2 -std=c11:
fct:# @fct
lockinc dword ptr [rip + a]
mfence
ret
a:
.long 0
So none of gcc/clang optimize this today, hence the need for an
x86-specific implementation.
Thanks,
Mathieu
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cket(parent_bucket, fini_bucket);
}
ht->flavor->read_unlock();
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quot;)
-#endif
Removing this removes support for older i686 and for URCU_ARCH_K1OM
(Xeon Phi). Do we intend to remove that support ?
Thanks,
Mathieu
#endif
-#define caa_cpu_relax() __asm__ __volatile__ ("rep; nop" : : : "memory")
-
#define HAS_C
add()
+#define cmm_smp_mb__after_uatomic_dec()
cmm_smp_mb__after_uatomic_add()
+
+#define cmm_smp_mb() cmm_mb()
#endif /* _URCU_UATOMIC_H */
[...]
Thanks,
Mathieu
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s not support __atomic builtins])])
## ##
## Optional features selection ##
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On 2023-03-21 10:48, Ondřej Surý wrote:
On 21. 3. 2023, at 15:46, Mathieu Desnoyers
wrote:
On 2023-03-21 06:21, Ondřej Surý wrote:
On 20. 3. 2023, at 19:37, Mathieu Desnoyers
wrote:
On 2023-03-17 17:37, Ondřej Surý via lttng-dev wrote:
FIXME: This is experiment that adds explicit memory
On 2023-03-21 06:21, Ondřej Surý wrote:
On 20. 3. 2023, at 19:37, Mathieu Desnoyers
wrote:
On 2023-03-17 17:37, Ondřej Surý via lttng-dev wrote:
FIXME: This is experiment that adds explicit memory barrier in the
free_completion in the workqueue.c, so ThreadSanitizer knows it's ok to
free
On 2023-03-21 10:44, Mathieu Desnoyers wrote:
On 2023-03-21 06:15, Ondřej Surý wrote:
On 20. 3. 2023, at 19:31, Mathieu Desnoyers
wrote:
On 2023-03-17 17:37, Ondřej Surý via lttng-dev wrote:
When adding REMOVED_FLAG to the pointers in the rculfhash
implementation, retype the generic
On 2023-03-21 06:15, Ondřej Surý wrote:
On 20. 3. 2023, at 19:31, Mathieu Desnoyers
wrote:
On 2023-03-17 17:37, Ondřej Surý via lttng-dev wrote:
When adding REMOVED_FLAG to the pointers in the rculfhash
implementation, retype the generic pointer to uintptr_t to fix the
compiler error
On 2023-03-20 14:38, Mathieu Desnoyers via lttng-dev wrote:
On 2023-03-20 14:28, Ondřej Surý wrote:
On 20. 3. 2023, at 19:03, Mathieu Desnoyers
wrote:
In doc/uatomic-api.md, we document:
"```c
type uatomic_cmpxchg(type *addr, type old, type new);
```
An atomic read-modify-write oper
On 2023-03-20 14:28, Ondřej Surý wrote:
On 20. 3. 2023, at 19:03, Mathieu Desnoyers
wrote:
In doc/uatomic-api.md, we document:
"```c
type uatomic_cmpxchg(type *addr, type old, type new);
```
An atomic read-modify-write operation that performs this
sequence of operations atomically:
urcu_workqueue_completion, ref);
+ assert(!urcu_ref_get_unless_zero(>ref));
Perhaps what we really want here is an ANNOTATE_UNPUBLISH_MEMORY_RANGE()
of some sort ?
Thanks,
Mathieu
free(completion);
}
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t);
}
ht->flavor->read_unlock();
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_smp_wmc(); \
- _v = _v;/* Work around clang "unused result" */ \
})
#endif /* _URCU_SYSTEM_H */
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ction to be
* expanded directly in non-LGPL code.
*/
-#define _rcu_assign_pointer(p, v) _rcu_set_pointer(&(p), v)
+#define _rcu_assign_pointer(p, v) rcu_set_pointer(&(p), v)
#ifdef __cplusplus
}
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On 2023-03-20 14:06, Mathieu Desnoyers via lttng-dev wrote:
On 2023-03-17 17:37, Ondřej Surý via lttng-dev wrote:
Use __atomic_thread_fence(__ATOMIC_ACQ_REL) for cmm_barrier(), so
ThreadSanitizer can understand the memory synchronization.
You should update the patch subject and commit message
On 2023-03-20 14:03, Mathieu Desnoyers via lttng-dev wrote:
On 2023-03-17 17:37, Ondřej Surý via lttng-dev wrote:
Replace the custom assembly code in include/urcu/uatomic/ with __atomic
builtins provided by C11-compatible compiler.
[...]
+#define UATOMIC_HAS_ATOMIC_BYTE
+#define
compiler to perform only a single access to a variable
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MIC_ACQ_REL atomic operations are implemented with LOCK
prefixed atomic ops, which imply the barrier already, leaving the
before/after_uatomic_*() as no-ops.
Thanks,
Mathieu
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On 2023-03-17 13:02, Ondřej Surý wrote:
On 17. 3. 2023, at 14:44, Mathieu Desnoyers
wrote:
I would indeed like to remove all the custom atomics assembly code from liburcu
now that there are good atomics support in the major compilers (gcc and clang).
Here's very preliminary implementation
On 2023-03-17 11:50, Ondřej Surý wrote:
On 17. 3. 2023, at 14:44, Mathieu Desnoyers
wrote:
Sure, can you please submit the patch as a separate email with subject/commit
message/signed-off-by tag ?
https://gitlab.isc.org/isc-projects/userspace-rcu/-/merge_requests/1.patch
Would this work
ing list
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On 2023-03-13 11:30, Ondřej Surý wrote:
Hi Matthieu,
I spent some more time with the userspace-rcu on Friday and over weekend and
now I am in much better place.
On 13. 3. 2023, at 15:29, Mathieu Desnoyers
wrote:
On 2023-03-11 01:04, Ondřej Surý via lttng-dev wrote:
Hey,
so, we
ecifically,
but this is not
different from other linked-list uses.
Thanks,
Mathieu
Thank you!
Ondrej
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for each stream.
lttng enable-channel --kernel --tracefile-count=8 \
--tracefile-size=4194304 my-channel
See lttng-enable-channel(1) for more info.
I hope this helps!
Mathieu
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;'
Where "string" can include wildcards as well.
Hoping this helps,
Mathieu
Dom
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oject website: https://liburcu.org
Git repository: git://git.liburcu.org/urcu.git
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Mathieu!
I added your latest implementation to my test and it seems to perform well on
both arm and arm64. Since the test was written in C++ I had to make a small
change to the cast in order for the test to compile.
Micke
-Ursprungligt meddelande-
Från: Mathieu Desnoyers
Skickat: den
.
Feedback is welcome,
Thanks,
Mathieu
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On 2023-01-31 11:18, Mathieu Desnoyers wrote:
On 2023-01-31 11:08, Mathieu Desnoyers wrote:
On 2023-01-30 01:50, Beckius, Mikael via lttng-dev wrote:
Hello Matthieu!
I have looked at this in place of Anders and as far as I can tell
this is not an arm64 issue but an arm issue. And even on arm
On 2023-01-31 11:08, Mathieu Desnoyers wrote:
On 2023-01-30 01:50, Beckius, Mikael via lttng-dev wrote:
Hello Matthieu!
I have looked at this in place of Anders and as far as I can tell this
is not an arm64 issue but an arm issue. And even on arm
__ARM_FEATURE_UNALIGNED is 1 so it seems
Micke
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ustream =
index = {offset = 0, packet_size = 575697416355872,
content_size = 17564043391468256584, timestamp_begin =
17564043425827782792, timestamp_end = 34359738496,
Regards
Anders
fre 24 nov. 2017 kl 20:18 skrev Mathieu Desnoyers
mailto:mathieu.desnoy...@efficios.com>>
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a good 10 years of activity from 2003 to 2013, but it is now high
time to redirect users to Trace Compass and Babeltrace instead.
Thanks,
Mathieu
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