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Add init_param3() to subr_param. This function is called

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immediately after the kernel map has been sized, and is
the optimal place for the autosizing of memory allocations
which occur within the kernel map to occur.

Suggested by:	bde
This commit is contained in:
Mike Silbersack 2003-07-11 00:01:03 +00:00
parent 928a49644f
commit 347194c172
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=117391
3 changed files with 22 additions and 26 deletions
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5
sys/kern/kern_malloc.c
View File

@ -444,6 +444,11 @@ kmeminit(dummy)
if (((vm_kmem_size / 2) / PAGE_SIZE) > cnt.v_page_count)
vm_kmem_size = 2 * cnt.v_page_count * PAGE_SIZE;
/*
* Tune settings based on the kernel map's size at this time.
*/
init_param3(vm_kmem_size / PAGE_SIZE);
/*
* In mbuf_init(), we set up submaps for mbufs and clusters, in which
* case we rounddown() (nmbufs * MSIZE) and (nmbclusters * MCLBYTES),

42
sys/kern/subr_param.c
View File

@ -135,23 +135,6 @@ void
init_param2(long physpages)
{
/* Kernel map size */
int kmempages, kmemtunable;
kmempages = VM_KMEM_SIZE / PAGE_SIZE;
#if defined(VM_KMEM_SIZE_SCALE)
if ((physpages / VM_KMEM_SIZE_SCALE) > kmempages)
kmempages = (physpages / VM_KMEM_SIZE_SCALE);
#endif
#if defined(VM_KMEM_SIZE_MAX)
if (kmempages * PAGE_SIZE >= VM_KMEM_SIZE_MAX)
kmempages = VM_KMEM_SIZE_MAX / PAGE_SIZE;
#endif
kmemtunable = 0;
TUNABLE_INT_FETCH("kern.vm.kmem.size", &kmemtunable);
if (kmemtunable != 0)
kmempages = kmemtunable / PAGE_SIZE;
kmempages = min(physpages, kmempages);
/* Base parameters */
maxusers = MAXUSERS;
TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
@ -179,7 +162,23 @@ init_param2(long physpages)
TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
maxprocperuid = (maxproc * 9) / 10;
maxfilesperproc = (maxfiles * 9) / 10;
/*
* Cannot be changed after boot.
*/
nbuf = NBUF;
TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
ncallout = 16 + maxproc + maxfiles;
TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
}
/*
* Boot time overrides that are scaled against the kernel map
*/
void
init_param3(long kmempages)
{
/*
* Limit number of pipes to a reasonable fraction of kmap entries,
* pageable pipe memory usage to 2.5% of the kernel map, and wired
@ -196,13 +195,4 @@ init_param2(long physpages)
maxpipekva = 512 * 1024;
if (maxpipekvawired < 512 * 1024)
maxpipekvawired = 512 * 1024;
/*
* Cannot be changed after boot.
*/
nbuf = NBUF;
TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
ncallout = 16 + maxproc + maxfiles;
TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
}

1
sys/sys/systm.h
View File

@ -147,6 +147,7 @@ void critical_enter(void);
void critical_exit(void);
void init_param1(void);
void init_param2(long physpages);
void init_param3(long kmempages);
void tablefull(const char *);
int kvprintf(char const *, void (*)(int, void*), void *, int,
__va_list) __printflike(1, 0);