selftests/ublk: add shared memory zero-copy test

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Add test_shmem_zc_01.sh which tests UBLK_IO_F_SHMEM_ZC on the null
target using a hugetlbfs shared buffer. Both kublk (--htlb) and fio
(--mem=mmaphuge:<path>) mmap the same hugetlbfs file with MAP_SHARED,
sharing physical pages. The kernel PFN match enables zero-copy I/O.

Uses standard fio --mem=mmaphuge:<path> (supported since fio 1.10),
no patched fio required.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://patch.msgid.link/20260331153207.3635125-8-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Ming Lei 2026-03-31 23:31:58 +08:00 • committed by Jens Axboe

parent ec20aa44ac

commit 2f1e9468bd

2 changed files with 74 additions and 0 deletions

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tools/testing/selftests/ublk/Makefile

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72

tools/testing/selftests/ublk/test_shmemzc_01.sh Executable file

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