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docs/envvars: document ANV_SYS_MEM_LIMIT

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This option was added by fdbdfaed01 ("anv: add ANV_SYS_MEM_LIMIT for
debugging system memory restrictions").

Acked-by: Tapani Pälli <tapani.palli@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41277>
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Paulo Zanoni 2026-04-29 15:05:09 -07:00 • committed by Marge Bot
parent cf7ada8475
commit 0e81aac260
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docs/envvars.rst
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@ -1002,6 +1002,23 @@ Anvil(ANV) driver environment variables
advertised queues to include 1 queue with compute-only support, and
it would override the number of graphics+compute queues to be 0.
.. envvar:: ANV_SYS_MEM_LIMIT
Changes the amount of system memory that is available for graphics usage in
the Vulkan system memory heap. The variable accepts an integer from 10 to
100, which represents the percentage of system memory that will be used as
the host memory heap size. The default value is 75 if the system has more
than 4GB of system RAM, 50 otherwise.
Note that this memory is shared between the application's Vulkan allocations
and the system's general needs. If a value too close to 100 is set and fully
used, the driver may not have enough memory for its data structures and the
application may fail to perform system allocations (e.g., malloc()), which
may lead to errors or excessive memory swapping.
This option can also be used to limit memory usage by memory-hungry
applications.
Hasvk driver environment variables
---------------------------------------