mm: shmem: override mTHP shmem default with a kernel parameter

Add the ``thp_shmem=`` kernel command line to allow specifying the default
policy of each supported shmem hugepage size.  The kernel parameter
accepts the following format:

thp_shmem=<size>[KMG],<size>[KMG]:<policy>;<size>[KMG]-<size>[KMG]:<policy>

For example,

thp_shmem=16K-64K:always;128K,512K:inherit;256K:advise;1M-2M:never;4M-8M:within_size

Some GPUs may benefit from using huge pages.  Since DRM GEM uses shmem to
allocate anonymous pageable memory, it's essential to control the huge
page allocation policy for the internal shmem mount.  This control can be
achieved through the ``transparent_hugepage_shmem=`` parameter.

Beyond just setting the allocation policy, it's crucial to have granular
control over the size of huge pages that can be allocated.  The GPU may
support only specific huge page sizes, and allocating pages larger/smaller
than those sizes would be ineffective.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Maíra Canal <[email protected]>
Reviewed-by: Baolin Wang <[email protected]>
Cc: Barry Song <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Lance Yang <[email protected]>
Cc: Ryan Roberts <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions