Add a new loader tunable, vm.kmem_zmax which allows a system administrator
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
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bda06553fd
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7001d850bb
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=269964
@ -172,6 +172,10 @@ u_long vm_kmem_size;
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SYSCTL_ULONG(_vm, OID_AUTO, kmem_size, CTLFLAG_RDTUN, &vm_kmem_size, 0,
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"Size of kernel memory");
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static u_long kmem_zmax = KMEM_ZMAX;
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SYSCTL_ULONG(_vm, OID_AUTO, kmem_zmax, CTLFLAG_RDTUN, &kmem_zmax, 0,
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"Maximum allocation size that malloc(9) would use UMA as backend");
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static u_long vm_kmem_size_min;
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SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_min, CTLFLAG_RDTUN, &vm_kmem_size_min, 0,
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"Minimum size of kernel memory");
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@ -485,7 +489,7 @@ malloc(unsigned long size, struct malloc_type *mtp, int flags)
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size = redzone_size_ntor(size);
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#endif
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if (size <= KMEM_ZMAX) {
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if (size <= kmem_zmax) {
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mtip = mtp->ks_handle;
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if (size & KMEM_ZMASK)
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size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
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@ -776,6 +780,9 @@ mallocinit(void *dummy)
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uma_startup2();
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if (kmem_zmax < PAGE_SIZE || kmem_zmax > KMEM_ZMAX)
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kmem_zmax = KMEM_ZMAX;
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mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
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#ifdef INVARIANTS
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mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
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@ -800,7 +807,7 @@ mallocinit(void *dummy)
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}
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for (;i <= size; i+= KMEM_ZBASE)
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kmemsize[i >> KMEM_ZSHIFT] = indx;
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}
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}
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SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_SECOND, mallocinit, NULL);
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