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If a thread already tries to allocate a new memory range, wait for it

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instead of trying to do the same.
This commit is contained in:
Olivier Houchard 2005-10-03 14:16:41 +00:00
parent b834efd591
commit 1f59105ee7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=150868
1 changed files with 22 additions and 7 deletions
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29
sys/arm/arm/vm_machdep.c
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@ -8,7 +8,7 @@
* the Systems Programming Group of the University of Utah Computer
* Science Department, and William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* 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
@ -242,7 +242,7 @@ sf_buf_alloc(struct vm_page *m, int flags)
sf->m = m;
nsfbufsused++;
nsfbufspeak = imax(nsfbufspeak, nsfbufsused);
pmap_qenter(sf->kva, &sf->m, 1);
pmap_kenter(sf->kva, VM_PAGE_TO_PHYS(sf->m));
done:
mtx_unlock(&sf_buf_lock);
return (sf);
@ -409,7 +409,6 @@ arm_uma_do_alloc(struct arm_small_page **pglist, int bytes, int pagetable)
{
void *ret;
vm_page_t page_array = NULL;
*pglist = (void *)kmem_malloc(kmem_map, (0x100000 / PAGE_SIZE) *
sizeof(struct arm_small_page), M_WAITOK);
@ -430,8 +429,6 @@ arm_uma_do_alloc(struct arm_small_page **pglist, int bytes, int pagetable)
mtx_unlock(&smallalloc_mtx);
pmap_kenter_section((vm_offset_t)ret, pa
, pagetable);
} else {
kmem_free(kmem_map, (vm_offset_t)*pglist,
(0x100000 / PAGE_SIZE) * sizeof(struct arm_small_page));
@ -447,6 +444,8 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
void *ret;
struct arm_small_page *sp, *tmp;
TAILQ_HEAD(,arm_small_page) *head;
static int in_alloc;
static int in_sleep;
*flags = UMA_SLAB_PRIV;
/*
@ -459,12 +458,24 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
head = (void *)&pages_normal;
mtx_lock(&smallalloc_mtx);
retry:
sp = TAILQ_FIRST(head);
if (!sp) {
/* No more free pages, need to alloc more. */
if (in_alloc && (wait & M_WAITOK)) {
/* Somebody else is already doing the allocation. */
in_sleep++;
msleep(&in_alloc, &smallalloc_mtx, PWAIT,
"smallalloc", 0);
in_sleep--;
goto retry;
}
if (wait & M_WAITOK)
in_alloc = 1;
mtx_unlock(&smallalloc_mtx);
if (!(wait & M_WAITOK)) {
*flags = UMA_SLAB_KMEM;
ret = (void *)kmem_malloc(kmem_map, bytes, wait);
return (ret);
}
@ -482,7 +493,8 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
ret = (char *)ret + 0x100000 - PAGE_SIZE;
TAILQ_INSERT_HEAD(&free_pgdesc, &sp[(0x100000 / (
PAGE_SIZE)) - 1], pg_list);
}
} else
*flags = UMA_SLAB_KMEM;
} else {
sp = TAILQ_FIRST(head);
@ -490,6 +502,9 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
TAILQ_INSERT_HEAD(&free_pgdesc, sp, pg_list);
ret = sp->addr;
}
in_alloc = 0;
if (in_sleep)
wakeup(&in_alloc);
mtx_unlock(&smallalloc_mtx);
if ((wait & M_ZERO))
bzero(ret, bytes);
@ -502,7 +517,7 @@ uma_small_free(void *mem, int size, u_int8_t flags)
pd_entry_t *pd;
pt_entry_t *pt;
if (mem < (void *)alloc_firstaddr)
if (flags & UMA_SLAB_KMEM)
kmem_free(kmem_map, (vm_offset_t)mem, size);
else {
struct arm_small_page *sp;