As discussed on -current, remove the hardcoded default maxswzone.
MFC after: 3 weeks
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=239255
@ -122,14 +122,6 @@
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#endif
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#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
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/*
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* Ceiling on amount of swblock kva space, can be changed via
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* the kern.maxswzone /boot/loader.conf variable.
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*/
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#ifndef VM_SWZONE_SIZE_MAX
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#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
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#endif
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/*
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* Mach derived conversion macros
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*/
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@ -613,17 +613,26 @@ Not all architectures use such buffers; see
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for details.
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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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maximum amount of swap the system can support.
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This value is specified in bytes of KVA space
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and defaults to 32MBytes on i386 and amd64.
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Care should be taken
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to not reduce this value such that the actual
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amount of configured swap exceeds 1/2 the
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kernel-supported swap.
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The default of 32MB allows
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the kernel to support a maximum of ~7GB of swap.
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Only change
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metadata, which directly governs the
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maximum amount of swap the system can support,
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at the rate of approximately 200 MB of swap space
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per 1 MB of metadata.
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This value is specified in bytes of KVA space.
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If no value is provided, the system allocates
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enough memory to handle an amount of swap
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that corresponds to eight times the amount of
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physical memory present in the system.
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.Pp
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Note that swap metadata can be fragmented,
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which means that the system can run out of
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space before it reaches the theoretical limit.
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Therefore, care should be taken to not configure
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more swap than approximately half of the
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theoretical maximum.
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.Pp
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Running out of space for swap metadata can leave
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the system in an unrecoverable state.
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Therefore, you should only change
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this parameter if you need to greatly extend the
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KVM reservation for other resources such as the
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buffer cache or
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@ -122,14 +122,6 @@
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#endif
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#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
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/*
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* Ceiling on amount of swblock kva space, can be changed via
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* the kern.maxswzone /boot/loader.conf variable.
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*/
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#ifndef VM_SWZONE_SIZE_MAX
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#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
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#endif
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/*
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* Ceiling on size of buffer cache (really only effects write queueing,
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* the VM page cache is not effected), can be changed via
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