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Friday, October 18th, 2019
| Time |
Event |
| 1:20p |
Security updates for Friday
Security updates have been issued by Debian (poppler, sudo, and wordpress), Oracle (java-1.8.0-openjdk), Red Hat (java-1.8.0-openjdk), Scientific Linux (java-1.8.0-openjdk, java-11-openjdk, and kernel), and SUSE (kernel and postgresql10). | | 2:15p |
Five new stable kernels Greg Kroah-Hartman has announced the release of the 5.3.7, 4.19.80, 4.14.150, 4.9.197, and 4.4.197 stable kernels. All five contain important fixes throughout the kernel tree, as usual. Users of those series should upgrade. | | 2:53p |
LTTng 2.11.0 "Lafontaine" released After more than two years of development, the Linux trace toolkit next generation (LTTng) project has released version 2.11.0 of the kernel and user-space tracing tool. The release covers the LTTng tools, LTTng user-space tracer, and LTTng kernel modules. It includes a number of new features that are described in the announcement including session rotation, dynamic user-space tracing, call-stack capturing for the kernel and user space, improved networking performance, NUMA awareness for user-space tracing buffer allocation, and more. " The biggest feature of this release is the long-awaited session
rotation support. Session rotations now allow you to rotate an
ongoing tracing session much in the same way as you would rotate
logs.
The 'lttng rotate' command rotates the current trace chunk of
the current tracing session. Once a rotation is completed, LTTng does
not manage the trace chunk archive anymore: you can read it, modify it,
move it, or remove it.
Because a rotation causes the tracing session’s current sub-buffers
to be flushed, trace chunk archives are never redundant, that is, they
do not overlap over time, unlike snapshots.
Once a rotation is complete, offline analyses can be performed on
the resulting trace, much like in 'normal' mode. However, the big
advantage is that this can be done without interrupting tracing, and
without being limited to tools which implement the 'live' protocol." | | 9:52p |
[$] Implementing alignment guarantees for kmalloc() kmalloc() is a frequently used primitive for the allocation of small objects in the kernel. During the 2019
Linux Storage, Filesystem, and Memory Management Summit, Vlastimil Babka led a session about the unexpected alignment problems developers face when using this function. After a few months he has come back with the second
version of a patch set implementing a natural alignment guarantee for kmalloc(). From the strong opposition it faced initially, it seemed that the change would not get accepted. However, it ended up in Linus Torvalds's tree. Let's explore what happened. |
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