bits-2003 released with these changes:

Track all BITS dependencies (GRUB2, Python, ACPICA, libffi, and fdlibm) as git submodules, rather than as separate tarballs to unpack. Split all BITS-specific changes to these dependencies as commits in those git repositories, making them easier to track, update, and upstream. Submodules also ensure that each commit to BITS has a matching version of all dependencies that it builds with, and that changes to BITS and corresponding changes to dependencies are committed atomically.

BITS releases now provide a single source tarball containing both the BITS source and the dependencies under the deps directory. This avoids the need to unpack multiple source tarballs to specific locations before building.

New features:

  • Add support to decode and execute ACPI error injection (APEI, EINJ)

  • Add explore option to decode and display variable MTRRs

  • smilatency: Add a new function to time explicitly invoked SMIs

    The new smilatency.time_io_smi function explicitly invokes SMIs by writing to an IO port (by default, port 0xb2), and times the duration of those SMIs. The port, the byte written, and the number of SMIs to average can all be changed via optional parameters.

  • Update Python to a post-2.7.10 snapshot that supports --with-computed-gotos. This improves the performance of the Python interpreter.

  • python: Support the glob, optparse, pickle, profile, pstats, and unicodedata modules

  • Provide a bits.rdtsc() function to directly invoke the rdtsc instruction. Previously, Python code used rdmsr on MSR 0x10.

  • Update to ACPICA 20150717

  • acpi: Add summary before SRAT table decode


Bugfixes and cleanups:

  • Makefile: Fix build on systems that change configure's default libdir

    The invocation of configure for grub did not specify --libdir, and assumed that it would end up as the default $(prefix)/lib. However, some distributions set a different systemwide default libdir (such as /lib64) in a way that affects the default for configured software. On such systems, the build would fail because it could not find files in GRUB's libdir. To avoid that, explicitly specify --libdir.

  • Makefile: When computing build version information, only use our own git repository

    If we don't have a .git directory, avoid searching upwards for a git repository. Otherwise, builds from beneath some other unrelated git repository would pick up a version number from there.

  • Don't hardcode a specific mwait hint value in pstate tests or cpu_frequency

    bits.cpu_frequency hardcoded an mwait hint of 0x20, and set that unconditionally, without restoring the original hint afterward. pstate.test_hardware_pstates and testacpi.test_pstates also hardcoded 0x20, and each had identical code to save and restore the original hints.

    Stop setting a hint in cpu_frequency; it now measures based on the current state only. Factor out the duplicate save/restore code into a new context manager bits.mwait.use_hint, and add a mechanism for CPUs to quirk the default hint to something other than 0x20.

  • bits.cpu_frequency: Stop assuming that APERF and MPERF use TSC frequency

    APERF and MPERF are only guaranteed to be proportional; MPERF need not actually match TSC. Read and use the TSC delta separately to scale the APERF/MPERF ratio.

  • Avoid calling bits.cpu_frequency twice when checking for availability. This speeds up the CPU frequency test.

  • bitfields.setbits: Fix bug referencing a name from the same module

  • topology.display: Let catch and display exceptions.

  • smilatency: Factor out the computation of TSCs per second as a helper.

    The new bits.tsc_per_sec() function computes the number of TSC counts per second; after the first call, it just returns the cached value.

    The new bits.format_tsc() function formats a number of TSC counts as a time string with units.

  • cstate_residency: Use the new bits.mwait.use_hint helper.

    This factors out common code, and ensures that the hint is restored after the test.

  • python: Fix time.localtime to accept float arguments

  • python: Make our file-like objects, used for stdout/stderr streams, support .flush()

  • Move some bits-specific modules into the bits.* module namespace

    This avoids possible conflicts between bits modules and standard Python modules.

  • Work around ACPICA bug: skip over initial NULLs from AcpiGetTableByIndex below index 3

    ACPICA started reserving index slots for 32-bit and 64-bit FACS, and returning NULL for those that don't exist, with other tables starting at index 3. This breaks the previous API that allowed enumerating tables until the first NULL is returned. Work around that by always grabbing the first 3 (filtering NULL), and then starting the enumeration-until-NULL from 3 rather than 0.

  • acpi: Rename duplicate field in SRATMemoryAffinity

  • acpi: get_cpupaths: Fix handling of x2apic CPUs (with _UID)

  • acpi: Fix FACS parsing to return the parsed structure

  • cpudetect: Replace hardcoded list of CPU names with detection of available CPU modules

  • Move errno compatibility changes from pyconfig.h to errno.h. This allows them to support fdlibm as well, which eliminates one of our changes to fdlibm.