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commit 8908b9977efc334bf74ffa79923dc8b05fef9748
Author: Damien Zammit <[email protected]>
Date: Thu Dec 11 08:13:46 2025 +0000
mach_clock: Use a callwheel as per Costello & Varghese '95
Timeouts are now very fast to look up, at the expense of more memory,
a much shorter list is traversed rather than all of them. See [1].
Timeouts that are stopped before expiry are now faster to remove,
and inserting a timeout is faster.
Already set timeouts may be set again, resulting in their removal first,
then are reinserted. Indeed this happens routinely.
The thread timers are stored within the thread structures themselves,
so there is no arbitrary limit on their number, however for
legacy timeouts there are NTIMERS == 20 currently allocated statically
for things like comtimer (serial driver) which are in a reusable array.
TESTED: On Hurd i386 UP+apic
[1] Costello & Varghese 1995: https://doi.org/10.7936/K7VM49H5
Message-ID: <[email protected]>
-----------------------------------------------------------------------
Summary of changes:
device/chario.c | 8 +-
device/tty.h | 2 +
i386/i386at/ioapic.c | 2 +-
kern/mach_clock.c | 261 ++++++++++++++++++++++++++++++---------------------
kern/mach_clock.h | 36 ++++---
kern/sched_prim.c | 4 +-
kern/thread.h | 4 +-
7 files changed, 180 insertions(+), 137 deletions(-)
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