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LinuxKI 5.4 New Features and Fixes

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Mark Ray edited this page May 11, 2018 · 2 revisions

The LinuxKI Toolset version 5.4 is now available (05/11/2018). Version 5.4 includes the following changes:

  • Added support for Linux kernel through 4.16.3.
  • IRQ trace events now enabled by default.
  • Added new workqueue events as non-default events
  • New Kparse warnings:
    • How add_random impacts block device performance
    • Network-latency tuned profile may increase System CPU usage and decrease overall performance
    • High kworker CPU usage when using software RAID (md driver) with barrier writes
  • Enabled Advanced CPU statistics on Skylake processors.
  • Disabled Advanced CPU statistics for Virtual Machines as it was unreliable for some VMs.
  • Added LinuxKI manpages. See man linuxki(7).
  • Added /etc/profile.d/linuxki.sh to add /opt/linuxki so the PATH variable.
  • Added support to demangle C++ function names (and also an option to leave them mangled if desired).
  • Added Top Tasks by Multipath device to kidsk/kparse/clparse output to help identify tasks generating IO when kworkers initiate the IO at the SCSI layer
  • For runki script, added -p option to skip per-PID datat (lsof, stacks, numa_maps_maps) to avoid long delays if system has thousands of tasks on the system.
  • Improved error reporting if online analysis is done without root access or if debugfs is not mounted.
  • Added code to clear /sys/module/kgdboc/parameters/kgdboc to avoid crash as its incompatible with LinuxKI. Typically, customer systems do not have kgdboc set, but some internal lab systems do
  • Fixes
    • Change madvise/mmap/mmap2 length argument formatting from decimal to hex
    • Fixed kiinfo coredump when parsing cpuinfo output due to missing “@” character when looking for the GHz speed for kiinfo -live, fixed Global CPU usage (usr/sys% is sometimes off) on main global screen *:Fixed the multipath parsing to understand lines that start with “|-|-“
    • Removed PID stats from CPU window when running kiinfo -live on dumps as this stat is not available with trace dumps.

For more information, be sure to check out the LinuxKI MasterClass:

LinuxKI MasterClass

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