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ChangeLog.md

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Release 1.3.0

Features

  • Move sidecar files to independent dir under mod/.
  • Add conflict check with plugbpf.
  • Improve Dockerfile and dependent libraries.
  • Standardized spec of scheduler package.

Bugfix

  • Fix a bug when extern var inside a function.
  • Prevent compiler optimization of static functions in sidecar.
  • Fix a bug when building with multiple sidecar files.
  • Fix a bug when handling multiple lines of EXPORT_SYMBOL in macro.
  • Use the right rule to reference symbols in module.
  • Fixed a bug with _mod symbol reference count.
  • Set the default value for the new configs.
  • Don't collect syscalls from sidecars.
  • Don't keep inline function's code if it's not optimized.
  • Fix the bug that tasks enqueue between clear_sched_state() and rebuild_sched_state().

Docs

  • Add SPDX to all source files.
  • Update README about the location information of the RPM package storage and the system versions that plugsched supports by default.

Tests

  • Rebuild the container image when test.
  • Adapt to use colorlog (instead of coloredlogs) with main programs.

Release 1.2.0

Features

  • Migrate from Python2 to Python3.
  • Add tool compile_and_create_rpm.sh to make creating rpm from patch easier.
  • Bump AnolisOS base docker image from 8.4 to 8.6.
  • Speed up plugsched-cli init by optimizing the data collection.
  • Allow more code to be customized by modularizing header files too.
  • Generalize "boundary/" to be reused by the scheduler, eBPF and etc.
  • Moving sidecar to init stage, which takes part in modularization. And improve its user experience.
  • Support the kernel 5.10.
  • Support the kernel 3.10. (x86_64 only)
  • Reduce unneccessary callbacks by migrate sched_class for every task during update and rollback.
  • Add yeild and sched_exec to interface function set.
  • Print logging to stdio for better user experience when building the scheduler.
  • Improve stability of extraction, avoiding nasty compiling errors. (tested with kernel/{bpf,sched} and 5.10, 4.19)
  • Improve readability of extracted code by deleting __init function in unused macro branches.
  • Support explicitly refer to the module's and vmlinux's symbol with _mod and _orig preifx respectively.
  • Add conflict detection of ftrace or others hooked functions' header.

Bugfix

  • Fix a compiling error of stack_trace_save_tsk function passing a wrong type of argument.
  • Fix the mempool error that the functions or variables in headers should be static to avoid conflicts with kernel code.
  • Fix the unknown symbol error when installing module. Add the __used attribute to function pointers.
  • Fix the bug of extraction of va_list and "..." parameter in export_jump.h.
  • Fix the bug that some internal functions may be exported functions. Remove them outside.
  • Fix removing cgroup file twice in syscall test case, that can cause test to fail.
  • Fix panic and compiling bugs of stack-protector for aarch64.
  • Fix test/ bug catch_error print error when exitcode=0 and ENOPERM bug when chrt in test_sched_syscall.
  • Fix tainted_functions that includes __init functions.
  • Fix the backslashes cannot be deleted when deleting code in extraction stage.
  • Fix some bugs of the unnamed unions, enums and structures, that can cause the building errors.
  • Fix the bug where undefined function sets contained optimized functions, which can cause installation failure.
  • Fix some bugs of plugsched service. Keep service active and remove daemon-reload after starting service.
  • Fix the bug that some variables only used in __init function will be removed, because scheduler may be use them.
  • Fix some static interface functions been optimized that will be removed.
  • Fix both strong and weak symbol existing, and treat overriden weak symbols as outsiders.
  • Fix two race conditions bewteen redirecting and state rebuilding, that may cause panic.
  • Fix the bug that num_online_cpus maybe changed between parallel_state_check_init and stop_machine, which may cause system hung.
  • Fix a panic bug that stack check exits too early when insmod/rmmod.
  • Fix the stack checker not checking the __sched functions, which may cause panic.
  • Fix the bug about container that after installing some packages, containers refuses "podman exec -it".
  • Forbid redirecting mangled functions.
  • Fix the rebuilding of dying task that cannot found in init_tasklist, which can cause panic.

Docs

  • Fix some typoes.
  • Update documentation for new sidecar implementation.

Tests

  • Remove test case for sched_rt_runtime_us.
  • Add test case for stack pivot.
  • Add test case for memory pressure.
  • Add test case for reboot.
  • Add test case for bare package run-time performance.

Others

  • Using inner function __sched_setscheduler() to replace the interface function sched_setscheduler().

Release 1.1.1

BugFixes

  • Fix wrong list of optimized functions caused by the bug makefile and module.symvers gets overwritten when cli init.

Release 1.1.0

Features

  • Add a test framework. And integrate 5 automated test cases into CI.
  • Add fully support aarch64.
  • Add fully support for AnolisOS 8.
  • Add the per-cpu mempool infrastructure. It could be used like Linux kernel's per-cpu variable, as an extension to the existing mempool.
  • Support installing multiple versions of scheduler in multiple kernel versions system.

BugFixes

  • Fix installing failure bug in the Quick Start, that it used to break once cloud OS images upgrade.
  • Fix installing failure bug by ignoring confliction among hotfixes themselve, instead of with Plugsched.
  • Fix installing failure bug that after rebooting, scheduler won't be loaded.
  • Fix memory leak when using mempool.
  • Fix user-unfriendly bug that experimental BAD scheduler.rpm (maybe poorly programmed by user) couldn't be erased.
  • Fix potential panic bug caused by bottom-half of __schedule by adding callees of the bottom-half as interfaces.
  • Fix potential panic bug caused by GCC mangling (.isra, .constprop, .cold, etc.).
  • Fix potential panic bug caused by kernel modules (mainly KVM), because modules didn't participate in modularization.
  • Fix confliction checking with hotfixes. Now we check it each time scheduler is loaded, rather than only when installing rpm.
  • Fix some warnings with no harm.

Docs

  • Clarify how Plugsched deals with data-upgrade (Rebuild or inherit or reinitialize), now this technique is illustrated clearly.
  • Clarify that users shouldn't modify the size and semantic of data structure or its fields.
  • Enrich the Quick Start, let users get hands on with sched-feature too.
  • Update the architecture description figure.

Other improvements

  • Simplify sched_boundary.yaml by removing useless keys (sched_outsider & force_outsider). Now users won't be confused about them.
  • Improve user experience when debugging by outputting make result to the screen. Now users locate compiling errors more easily.