Rename the kern.vm.kmem.size tunable to the more logical vm.kmem_size. To
assure backward compatibility (conditional on !BURN_BRIDGES), look it up by its old name first, and log a warning (but accept the setting) if it was found. If both the old and new name are defined, the new name takes precedence. Also export vm.kmem_size as a read-only sysctl variable; I find it hard to tune a parameter when I don't know its default value, especially when that default value is computed at boot time.
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=125091
@ -244,7 +244,7 @@
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Set the number of sendfile buffers to be allocated. This
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overrides the value determined when the kernel was compiled.
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set kern.vm.kmem.size=<value> VM_KMEM_SIZE
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set vm.kmem_size=<value> VM_KMEM_SIZE
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Sets the size of kernel memory (bytes). This overrides
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the value determined when the kernel was compiled.
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@ -451,11 +451,6 @@ Set the number of
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buffers to be allocated.
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Overrides
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.Dv NSFBUFS .
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.It Va kern.vm.kmem.size
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Sets the size of kernel memory (bytes).
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This overrides the value determined when the kernel was compiled.
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Modifies
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.Va VM_KMEM_SIZE .
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.It Va kern.maxswzone
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Limits the amount of KVM to be used to hold swap
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meta information, which directly governs the
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@ -499,6 +494,11 @@ Overrides the compile-time set value of
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or the preset default of 512.
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Must be a power of 2.
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.El
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.It Va vm.kmem_size
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Sets the size of kernel memory (bytes).
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This overrides the value determined when the kernel was compiled.
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Modifies
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.Va VM_KMEM_SIZE .
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.Ss BUILTIN PARSER
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When a builtin command is executed, the rest of the line is taken
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by it as arguments, and it is processed by a special parser which
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@ -96,10 +96,10 @@ module_path="/boot/kernel;/boot/modules" # Set the module search path
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#kern.ipc.nmbclusters="" # Set the number of mbuf clusters
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#kern.ipc.nmbufs="" # Set the maximum number of mbufs
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#kern.ipc.nsfbufs="" # Set the number of sendfile(2) bufs
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#kern.vm.kmem.size="" # Sets the size of kernel memory (bytes)
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#net.inet.tcp.tcbhashsize="" # Set the value of TCBHASHSIZE
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#vfs.root.mountfrom="" # Specify root partition in a way the
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# kernel understands
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#vm.kmem_size="" # Sets the size of kernel memory (bytes)
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#debug.ktr.cpumask="0xf" # Bitmask of CPUs to enable KTR on
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#debug.ktr.mask="0x1200" # Bitmask of KTR events to enable
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#debug.ktr.verbose="1" # Enable console dump of KTR events
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@ -133,6 +133,8 @@ struct {
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};
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u_int vm_kmem_size;
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SYSCTL_UINT(_vm, OID_AUTO, kmem_size, CTLFLAG_RD, &vm_kmem_size, 0,
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"Size of kernel memory");
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/*
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* The malloc_mtx protects the kmemstatistics linked list.
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@ -444,7 +446,11 @@ kmeminit(dummy)
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#endif
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/* Allow final override from the kernel environment */
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TUNABLE_INT_FETCH("kern.vm.kmem.size", &vm_kmem_size);
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#ifndef BURN_BRIDGES
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if (TUNABLE_INT_FETCH("kern.vm.kmem.size", &vm_kmem_size) != 0)
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printf("kern.vm.kmem.size is now called vm.kmem_size!\n");
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#endif
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TUNABLE_INT_FETCH("vm.kmem_size", &vm_kmem_size);
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/*
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* Limit kmem virtual size to twice the physical memory.
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