diff options
author | jake <jake@FreeBSD.org> | 2002-05-25 01:12:23 +0000 |
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committer | jake <jake@FreeBSD.org> | 2002-05-25 01:12:23 +0000 |
commit | 88bdee3b2f9048a8dbf72ac87d2777d86fb44e03 (patch) | |
tree | 291c292aac96d7cbab66993c354579293c25e83b /sys/amd64 | |
parent | 01468c75101a65056224497f940e244c48d78bb5 (diff) | |
download | FreeBSD-src-88bdee3b2f9048a8dbf72ac87d2777d86fb44e03.zip FreeBSD-src-88bdee3b2f9048a8dbf72ac87d2777d86fb44e03.tar.gz |
Make the run queue parameters machine dependent. Optimize 64 bit
architectures by using a 64 bit word for the bit array which keeps
track of non-empty queues.
Reviewed by: peter
Diffstat (limited to 'sys/amd64')
-rw-r--r-- | sys/amd64/include/runq.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/sys/amd64/include/runq.h b/sys/amd64/include/runq.h new file mode 100644 index 0000000..1ea7735 --- /dev/null +++ b/sys/amd64/include/runq.h @@ -0,0 +1,46 @@ +/* + * Copyright (c) 2001 Jake Burkholder <jake@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _MACHINE_RUNQ_H_ +#define _MACHINE_RUNQ_H_ + +#define RQB_LEN (2) /* Number of priority status words. */ +#define RQB_L2BPW (5) /* Log2(sizeof(rqb_word_t) * NBBY)). */ +#define RQB_BPW (1<<RQB_L2BPW) /* Bits in an rqb_word_t. */ + +#define RQB_BIT(pri) (1 << ((pri) & (RQB_BPW - 1))) +#define RQB_WORD(pri) ((pri) >> RQB_L2BPW) + +#define RQB_FFS(word) (ffs(word)) + +/* + * Type of run queue status word. + */ +typedef u_int32_t rqb_word_t; + +#endif |