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| author | Richard Braun <rbraun@sceen.net> | 2013-01-11 23:49:23 +0100 |
|---|---|---|
| committer | Richard Braun <rbraun@sceen.net> | 2013-01-11 23:49:23 +0100 |
| commit | 644a177521a390133c98b9de83934a25e2be4f67 (patch) | |
| tree | 186d4c4d5b23b4e0a94460ecb75e7a1f910a249f /kern/macros.h | |
| parent | fb1b8cf4f196903f770ce9b0274423626c145517 (diff) | |
kern/thread: improve processor-local scheduling
This change introduces scheduling classes, including support for real-time
and time-sharing threads. The real-time class matches the requirements of
the POSIX SCHED_FIFO and SCHED_RR policies. The time-sharing class makes
use of a scheduling algorithm based on group ratio round-robin (GR3) to
provide proportional fairness.
Diffstat (limited to 'kern/macros.h')
| -rw-r--r-- | kern/macros.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kern/macros.h b/kern/macros.h index 012dd15b..8e04d72b 100644 --- a/kern/macros.h +++ b/kern/macros.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2009, 2010 Richard Braun. + * Copyright (c) 2009, 2010, 2013 Richard Braun. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -44,6 +44,8 @@ #define MIN(a, b) ((a) < (b) ? (a) : (b)) #define MAX(a, b) ((a) > (b) ? (a) : (b)) +#define DIV_CEIL(n, d) (((n) + (d) - 1) / (d)) + #define P2ALIGNED(x, a) (((x) & ((a) - 1)) == 0) #define ISP2(x) P2ALIGNED(x, x) #define P2ALIGN(x, a) ((x) & -(a)) |