Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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961 B
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33 lines
961 B
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.. SPDX-License-Identifier: GPL-2.0
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==========
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Huge Pages
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==========
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Contiguous Memory Allocator
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===========================
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CXL Memory onlined as SystemRAM during early boot is eligible for use by CMA,
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as the NUMA node hosting that capacity will be `Online` at the time CMA
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carves out contiguous capacity.
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CXL Memory deferred to the CXL Driver for configuration cannot have its
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capacity allocated by CMA - as the NUMA node hosting the capacity is `Offline`
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at :code:`__init` time - when CMA carves out contiguous capacity.
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HugeTLB
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=======
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Different huge page sizes allow different memory configurations.
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2MB Huge Pages
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--------------
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All CXL capacity regardless of configuration time or memory zone is eligible
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for use as 2MB huge pages.
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1GB Huge Pages
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--------------
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CXL capacity onlined in :code:`ZONE_NORMAL` is eligible for 1GB Gigantic Page
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allocation.
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CXL capacity onlined in :code:`ZONE_MOVABLE` is not eligible for 1GB Gigantic
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Page allocation.
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