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libxl: add a detailed explanation of the libxl domain memory model
Originally-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Converted to US-ASCII by iwj. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
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/* === Domain memory breakdown: HVM guests ==================================
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+ +----------+ +
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| | shadow | |
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| +----------+ |
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overhead | | extra | |
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| | external | |
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| +----------+ + |
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| | extra | | |
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| | internal | | |
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+ +----------+ + | | footprint
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| | video | | | |
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| +----------+ + + | | xen |
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| | | | | | actual | maximum |
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| | | | | | target | |
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| | guest | | | build | | |
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| | | | | start | | |
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static | | | | | | | |
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maximum | +----------+ | + + + +
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| | | |
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| | | |
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| | balloon | | build
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| | | | maximum
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| | | |
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+ +----------+ +
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extra internal = LIBXL_MAXMEM_CONSTANT
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extra external = LIBXL_HVM_EXTRA_MEMORY
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shadow = libxl_domain_build_info.shadow_memkb
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static maximum = libxl_domain_build_info.max_memkb
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video = libxl_domain_build_info.video_memkb
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build start = libxl_domain_build_info.target_memkb
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libxl_domain_setmaxmem -> xen maximum
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libxl_set_memory_target -> actual target
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=== Domain memory breakdown: PV guests ==================================
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+ +----------+ +
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overhead | | extra | |
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| | external | |
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| +----------+ + |
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| | extra | | |
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| | internal | | |
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+ +----------+ + + + | | footprint
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| | | | | | | xen |
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| | | | | | actual | maximum |
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| | guest | | | build | target | |
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| | | | | start | | |
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static | | | | | | | |
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maximum | +----------+ | + + + +
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| | | |
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| | | |
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| | balloon | | build
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| | | | maximum
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| | | |
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+ +----------+ +
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extra internal = LIBXL_MAXMEM_CONSTANT
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extra external = LIBXL_PV_EXTRA_MEMORY
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static maximum = libxl_domain_build_info.max_memkb
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build start = libxl_domain_build_info.target_memkb
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libxl_domain_setmaxmem -> xen maximum
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libxl_set_memory_target -> actual target
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========================================================================= */
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