selftests/ublk: add hugetlbfs shmem_zc test for loop target

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Add test_shmem_zc_02.sh which tests the UBLK_IO_F_SHMEM_ZC zero-copy
path on the loop target using a hugetlbfs shared buffer. Both kublk and
fio mmap the same hugetlbfs file with MAP_SHARED, sharing physical
pages. The kernel's PFN matching enables zero-copy — the loop target
reads/writes directly from the shared buffer to the backing file.

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/20260331153207.3635125-9-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Ming Lei 2026-03-31 23:31:59 +08:00 • committed by Jens Axboe

parent 2f1e9468bd

commit d486650332

2 changed files with 69 additions and 0 deletions

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tools/testing/selftests/ublk/Makefile

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68

tools/testing/selftests/ublk/test_shmemzc_02.sh Executable file

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