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support BUFCACHE (a la the work i did for the i386, etc) 

XXX: this worked a while ago when i last tested, but i haven't
compiled it recently. the code looks sane, however
This commit is contained in:
lukem 1999-03-05 03:26:36 +00:00
parent 8336bf2055
commit 6bf077c969
1 changed files with 34 additions and 13 deletions
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47
sys/arch/arm32/arm32/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.59 1999/02/27 06:39:35 scottr Exp $ */
/* $NetBSD: machdep.c,v 1.60 1999/03/05 03:26:36 lukem Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
@ -146,6 +146,11 @@ int bufpages = BUFPAGES;
#else
int bufpages = 0;
#endif
#ifdef BUFCACHE
int bufcache = BUFCACHE; /* % of RAM to use for buffer cache */
#else
int bufcache = 0; /* fallback to old algorithm */
#endif
int cold = 1;
@ -601,19 +606,35 @@ allocsys(v)
#endif
/*
* Determine how many buffers to allocate. We use 10% of the
* first 2MB of memory, and 5% of the rest, with a minimum of 16
* buffers. We allocate 1/2 as many swap buffer headers as file
* i/o buffers.
* If necessary, determine the number of pages to use for the
* buffer cache. We allocate 1/2 as many swap buffer headers
* as file I/O buffers.
*/
if (bufpages == 0) {
if (physmem < arm_byte_to_page(2 * 1024 * 1024))
bufpages = physmem / (10 * CLSIZE);
else
bufpages = (arm_byte_to_page(2 * 1024 * 1024)
+ physmem) / (20 * CLSIZE);
}
if (bufpages == 0)
if (bufcache == 0) { /* use old algorithm */
/*
* Determine how many buffers to allocate. We use 10%
* of the first 2MB of memory, and 5% of the rest, with
* a minimum of 16 buffers.
*/
if (physmem < arm_byte_to_page(2 * 1024 * 1024))
bufpages = physmem / (10 * CLSIZE);
else
bufpages = (arm_byte_to_page(2 * 1024 * 1024)
+ physmem) / (20 * CLSIZE);
} else {
/*
* Set size of buffer cache to physmem/bufcache * 100
* (i.e., bufcache % of physmem).
*/
if (bufcache < 5 || bufcache > 95) {
printf(
"warning: unable to set bufcache to %d%% of RAM, using 10%%",
bufcache);
bufcache = 10;
}
bufpages= physmem / (CLSIZE * 100) * bufcache;
}
#ifdef DIAGNOSTIC
if (bufpages == 0)