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Add a new loader tunable, vm.kmem_zmax which allows a system administrator

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to limit the maximum allocation size that malloc(9) would consider using
the UMA cache allocator as backend.

Suggested by:	alfred
MFC after:	2 weeks
This commit is contained in:
Xin LI 2014-08-14 05:31:39 +00:00
parent bda06553fd
commit 7001d850bb
1 changed files with 9 additions and 2 deletions
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11
sys/kern/kern_malloc.c
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@ -172,6 +172,10 @@ u_long vm_kmem_size;
SYSCTL_ULONG(_vm, OID_AUTO, kmem_size, CTLFLAG_RDTUN, &vm_kmem_size, 0,
"Size of kernel memory");
static u_long kmem_zmax = KMEM_ZMAX;
SYSCTL_ULONG(_vm, OID_AUTO, kmem_zmax, CTLFLAG_RDTUN, &kmem_zmax, 0,
"Maximum allocation size that malloc(9) would use UMA as backend");
static u_long vm_kmem_size_min;
SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_min, CTLFLAG_RDTUN, &vm_kmem_size_min, 0,
"Minimum size of kernel memory");
@ -485,7 +489,7 @@ malloc(unsigned long size, struct malloc_type *mtp, int flags)
size = redzone_size_ntor(size);
#endif
if (size <= KMEM_ZMAX) {
if (size <= kmem_zmax) {
mtip = mtp->ks_handle;
if (size & KMEM_ZMASK)
size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
@ -776,6 +780,9 @@ mallocinit(void *dummy)
uma_startup2();
if (kmem_zmax < PAGE_SIZE || kmem_zmax > KMEM_ZMAX)
kmem_zmax = KMEM_ZMAX;
mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
#ifdef INVARIANTS
mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
@ -800,7 +807,7 @@ mallocinit(void *dummy)
}
for (;i <= size; i+= KMEM_ZBASE)
kmemsize[i >> KMEM_ZSHIFT] = indx;
}
}
SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_SECOND, mallocinit, NULL);