- #MAILIST CONTROLLER 12.7 SERIAL GENERATOR#
- #MAILIST CONTROLLER 12.7 SERIAL FULL#
- #MAILIST CONTROLLER 12.7 SERIAL CODE#
Recommended LWN article: Strict memcpy() bounds checking for the kernel This would have caught all of the memcpy()-related buffer write overflow flaws identified in at least the last three years In order to eliminate a large class of common buffer overflow flaws that continue to persist in the kernel, these changes perform bounds checking of the destination struct member when they have a known size. This release implements stricter (no struct member overflows) bounds checking for memcpy(), memmove(), and memset() under CONFIG_FORTIFY_SOURCE. Stricter memcpy() compile-time bounds checking There also are some preparations for the future extent tree v2 changes.ġ.7. This release also adds support for cross-mount reflink/dedupe support, and several substantial performance improvements, especially for fsync-based workloads. This release lets user space tools avoid the extra decompression/compression by letting send/receive read and write compressed extents directly. When using send/receive, the sending side decompresses the data and the receiving side recompresses it before writing it out. The Btrfs file system supports transparent compression. Btrfs: Encoded I/O, cross-mount reflink/dedupe and performance improvements
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Headers rearchitecturing preparations for faster compilation timesĪ major rearchitecting of the kernel headers for significantly faster builds has been proposed this release introduces some of these changes in the task scheduler.ġ.6. Unlike kprobes and kretprobes, fprobe gives faster+instrumentation for multiple functions with single handler.ĭocumentation: Fprobe - Function entry/exit probeġ.5.
#MAILIST CONTROLLER 12.7 SERIAL FULL#
The reasons why this new probe API exists is that it doesn't use the ftrace full features, it just provides a way to attach callbacks on function entry and exit. This release includes a new one, fprobe, which is based on ftrace. Linux already provices ways to probe function calls. fprobe, for probing multiple functions with a single probe handler This release adjusts the imbalance on multi-LLC machines to allow an imbalance up to the point where LLCs should be balanced between nodes, which improves significantly the performance in some workloads.ġ.4. Some CPUs, like AMD Zen, have multiple Last Level Caches per node with local memory channels and due to the allowed imbalance, it's far harder to tune some workloads to run optimally than it is on hardware that has 1 LLC per node. Better process scheduling performance on AMD Zen The process can then start writing the event to the tracing buffer.ġ.3. A privileged task can enable that event, which will change the mapped byte to true. The process will then receive a byte in a page mapping from a mapped tracefs file that it can check against. A process can register an event describing the format of the event to the kernel. Processes often want to trace only when it's useful.
#MAILIST CONTROLLER 12.7 SERIAL CODE#
This enables a faster path for tracing from user mode data as well as opens managed code to participate in trace events, where stub locations are dynamic. This release adds a new ABI that allow processes to create and write to trace events that are isolated from kernel trace level events. Linux already has a method that allows tracing user space processes with the kernel tracing tools (uprobes). Recommended LWN article: Indirect branch tracking for Intel CPUs This makes harder for a exploit (and proprietary modules) to call some random function. The compiler inserts the required instructions where necessary to make this happen. The instruction by itself does nothing, but if the code being called lacks it, the CPU will refuse to run it. Indirect Branch Tracking is a feature found in Intel CPUs that attempts to improve security by forcing that functions called with indirect calls start with a specific ENDBR instruction. Support for Indirect Branch Tracking on Intel CPUs
#MAILIST CONTROLLER 12.7 SERIAL GENERATOR#
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Stricter memcpy() compile-time bounds checking.Btrfs: Encoded I/O, cross-mount reflink/dedupe and performance improvements.Headers rearchitecturing preparations for faster compilation times.fprobe, for probing multiple functions with a single probe handler.Better process scheduling performance on AMD Zen.Support for Indirect Branch Tracking on Intel CPUs.