18 Feb
2025
18 Feb
'25
2:18 p.m.
On 2/13/25 19:17, Lorenzo Stoakes wrote:
Extend the guard region self tests to explicitly assert that guard regions work correctly for functionality specific to file-backed and shmem mappings.
In addition to testing all of the existing guard region functionality that is currently tested against anonymous mappings against file-backed and shmem mappings (except those which are exclusive to anonymous mapping), we now also:
- Test that MADV_SEQUENTIAL does not cause unexpected readahead behaviour.
- Test that MAP_PRIVATE behaves as expected with guard regions installed in both a shared and private mapping of an fd.
- Test that a read-only file can correctly establish guard regions.
- Test a probable fault-around case does not interfere with guard regions (or vice-versa).
- Test that truncation does not eliminate guard regions.
- Test that hole punching functions as expected in the presence of guard regions.
- Test that a read-only mapping of a memfd write sealed mapping can have guard regions established within it and function correctly without violation of the seal.
- Test that guard regions installed into a mapping of the anonymous zero page function correctly.
Impressive.
Signed-off-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com
Acked-by: Vlastimil Babka vbabka@suse.cz