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11<h1>LITMUS<sup>RT</sup> Change Log</h1>
12
13<div class="preamble">
14This document is part of the documentation of the <a href="../index.html">LITMUS<sup>RT</sup> project</a>.
15</div>
16
17<h2>2008.2 -> 2008.3</h2>
18
19<ul>
20<li><p>New feature: <code>sys_null_call()</code>, a dummy system call that simplifies the process
21of determining system call overheads [<code>litmus/litmus.c</code>].</p></li>
22<li><p>New feature: support for starting timers on remote CPUs via
23<code>hrtimer_start_on()</code> [<code>kernel/hrtimer.c</code>].</p></li>
24<li><p>New feature: support dedicated release handling in GSN-EDF and a
25corresponding <code>/proc</code> interface [<code>litmus/rt_domain.c</code>, <code>litmus/sched_gsn_edf.c</code>,
26<code>litmus/litmus.c</code>].</p></li>
27<li><p>New feature: support IPI latency tracing [<code>litmus/trace.c</code>].</p></li>
28<li><p>Warn if a task's priority is compared against itself [<code>litmus/edf_common.c</code>].</p></li>
29<li><p>Remove duplicated code in heap_node allocation and allocate heap_node structs
30from a dedicated slab [<code>litmus/litmus.c</code>].</p></li>
31<li><p>Avoid memory allocation/de-allocation in the release queue handling hot-path
32[<code>litmus/rt_domain.c</code>]</p></li>
33<li><p>Use per-event hrtimers instead of multiplexing all future releases onto a
34single timer. Linux's hrtimers are cheap enough to do this, and it removes
35complexity.</p></li>
36<li><p>Uninline binomial heap implementation to reduce code size [<code>litmus/heap.c</code>].</p></li>
37<li><p>Assorted minor debugging improvements.</p></li>
38<li><p>Minor code cleanups.</p></li>
39<li><p>Bugfix: use <code>is_running()</code> in <code>litmus_schedule()</code> to test for task state change
40race; otherwise plugins might get confused due to unexpected
41<code>task_block()</code>/<code>wake_up()</code> calls.</p></li>
42<li><p>Bugfix: avoid deadlock in <code>hrtimer_cancel()</code>; use <code>hrtimer_try_to_cancel()</code>
43instead [<code>litmus/rt_domain.c</code>].</p></li>
44<li><p>Bugfix: avoid race that lead to arming the same timer twice
45[<code>litmus/rt_domain.c</code>].</p></li>
46<li><p>Bugfix: avoid use-after-free race in <code>release_heap</code> [<code>litmus/rt_domain.c</code>].</p></li>
47<li><p>Bugfix: avoid rare deadlock between timer base lock and release lock
48[<code>litmus/rt_domain.c</code>].</p></li>
49<li><p>Bugfix: fix compilation with <code>CONFIG_SCHED_TASK_TRACE</code> on <code>sparc64</code>
50[<code>include/litmus/sched_trace.h</code>].</p></li>
51<li><p>Bugfix: fix Linux execution time accounting in Litmus scheduling class so
52that <code>top(1)</code> and <code>ps(1)</code> work again [<code>litmus/sched_litmus.c</code>].</p></li>
53<li><p>Bugfix: make sure magic sysrq hotkeys do not collide [<code>litmus/litmus.c</code>].</p></li>
54<li><p><code>liblitmus</code>: switch to <code>scons</code> build system.</p></li>
55<li><p><code>liblitmus</code>: support <code>x86-64</code>-><code>i386</code> cross compilation.</p></li>
56<li><p><code>liblitmus</code>: add <code>cycles</code> tools to simplify measuring of CPU cycles per
57second.</p></li>
58<li><p><code>liblitmus</code>: support <code>null_call()</code> system call and add <code>null_call</code> tool (for
59system call overhead measurements).</p></li>
60<li><p><code>liblitmus</code>: improved diagnostic output if <code>setsched</code> fails.</p></li>
61<li><p><code>liblitmus</code>: support fractional costs and periods in <code>rtspin</code>.</p></li>
62<li><p><code>liblitmus</code>: improve <code>release_ts</code> with <code>-w</code> (wait for all tasks) and <code>-f</code>
63(wait for specified number of tasks) options.</p></li>
64<li><p><code>liblitmus</code>: remove outdated tests (<code>mode_test</code>, <code>np_test</code>, and <code>wait_test</code>).</p></li>
65<li><p><code>liblitmus</code>: remove <code>sched_trace</code> support. The removed code will be part of a
66future standalone <code>sched_trace</code> library.</p></li>
67<li><p><code>ft_tools</code>: switch to <code>scons</code> build system.</p></li>
68<li><p><code>ft_tools</code>: support <code>x86-64</code>-><code>i386</code> cross compilation.</p></li>
69<li><p><code>ft_tools</code>: support for IPI latency measurements (<code>SEND_RESCHED</code>).</p></li>
70</ul>
71
72<h2>Change History</h2>
73
74<ul>
75<li>Initially created by <a href="http://www.cs.unc.edu/~bbb">Bjoern B. Brandenburg</a> (bbb at cs.unc.edu) on 09/24/2009.</li>
76</ul>
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1LITMUS<sup>RT</sup> Change Log
2==============================
3
4<div class="preamble">
5This document is part of the documentation of the <a href="../index.html">LITMUS<sup>RT</sup> project</a>.
6</div>
7
82008.2 -> 2008.3
9----------------
10
11- New feature: `sys_null_call()`, a dummy system call that simplifies the process
12 of determining system call overheads [`litmus/litmus.c`].
13
14- New feature: support for starting timers on remote CPUs via
15 `hrtimer_start_on()` [`kernel/hrtimer.c`].
16
17- New feature: support dedicated release handling in GSN-EDF and a
18 corresponding `/proc` interface [`litmus/rt_domain.c`, `litmus/sched_gsn_edf.c`,
19 `litmus/litmus.c`].
20
21- New feature: support IPI latency tracing [`litmus/trace.c`].
22
23- Warn if a task's priority is compared against itself [`litmus/edf_common.c`].
24
25- Remove duplicated code in heap_node allocation and allocate heap_node structs
26 from a dedicated slab [`litmus/litmus.c`].
27
28- Avoid memory allocation/de-allocation in the release queue handling hot-path
29 [`litmus/rt_domain.c`]
30
31- Use per-event hrtimers instead of multiplexing all future releases onto a
32 single timer. Linux's hrtimers are cheap enough to do this, and it removes
33 complexity.
34
35- Uninline binomial heap implementation to reduce code size [`litmus/heap.c`].
36
37- Assorted minor debugging improvements.
38
39- Minor code cleanups.
40
41- Bugfix: use `is_running()` in `litmus_schedule()` to test for task state change
42 race; otherwise plugins might get confused due to unexpected
43 `task_block()`/`wake_up()` calls.
44
45- Bugfix: avoid deadlock in `hrtimer_cancel()`; use `hrtimer_try_to_cancel()`
46 instead [`litmus/rt_domain.c`].
47
48- Bugfix: avoid race that lead to arming the same timer twice
49 [`litmus/rt_domain.c`].
50
51- Bugfix: avoid use-after-free race in `release_heap` [`litmus/rt_domain.c`].
52
53- Bugfix: avoid rare deadlock between timer base lock and release lock
54 [`litmus/rt_domain.c`].
55
56- Bugfix: fix compilation with `CONFIG_SCHED_TASK_TRACE` on `sparc64`
57 [`include/litmus/sched_trace.h`].
58
59- Bugfix: fix Linux execution time accounting in Litmus scheduling class so
60 that `top(1)` and `ps(1)` work again [`litmus/sched_litmus.c`].
61
62- Bugfix: make sure magic sysrq hotkeys do not collide [`litmus/litmus.c`].
63
64- `liblitmus`: switch to `scons` build system.
65
66- `liblitmus`: support `x86-64`->`i386` cross compilation.
67
68- `liblitmus`: add `cycles` tools to simplify measuring of CPU cycles per
69 second.
70
71- `liblitmus`: support `null_call()` system call and add `null_call` tool (for
72 system call overhead measurements).
73
74- `liblitmus`: improved diagnostic output if `setsched` fails.
75
76- `liblitmus`: support fractional costs and periods in `rtspin`.
77
78- `liblitmus`: improve `release_ts` with `-w` (wait for all tasks) and `-f`
79 (wait for specified number of tasks) options.
80
81- `liblitmus`: remove outdated tests (`mode_test`, `np_test`, and `wait_test`).
82
83- `liblitmus`: remove `sched_trace` support. The removed code will be part of a
84 future standalone `sched_trace` library.
85
86- `ft_tools`: switch to `scons` build system.
87
88- `ft_tools`: support `x86-64`->`i386` cross compilation.
89
90- `ft_tools`: support for IPI latency measurements (`SEND_RESCHED`).
91
92
93Change History
94--------------
95- Initially created by <a href="http://www.cs.unc.edu/~bbb">Bjoern B. Brandenburg</a> (bbb at cs.unc.edu) on 09/24/2009.
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-22 16:46:59 -0400