riscv: vector: use kmem_cache to manage vector context

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The allocation size of thread.vstate.datap is always riscv_v_vsize. So
it is possbile to use kmem_cache_* to manage the allocation. This gives
users more information regarding allocation of vector context via
/proc/slabinfo. And it potentially reduces the latency of the first-use
trap because of the allocation caches.

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20240115055929.4736-10-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Andy Chiu 2024-01-15 05:59:28 +00:00 • committed by Palmer Dabbelt

parent 5b6048f2ff

commit bd446f5df5

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4

arch/riscv/include/asm/vector.h

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arch/riscv/kernel/process.c

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19

arch/riscv/kernel/vector.c

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