On Wed, Sep 17, 2025 at 3:58 AM 'David Hildenbrand' via kernel-team kernel-team@android.com wrote:
- test_suite_setup - Set up the VMA layout for VMA count testing.
- Sets up the following VMA layout:
- +----- base_addr
- |
- V
- +--------------+----------------------+--------------+----------------+--------------+----------------+--------------+-----+----------------+--------------+
- | Guard Page | | Guard Page | Extra Map 1 | Unmapped Gap | Extra Map 2 | Unmapped Gap | ... | Extra Map N | Unmapped Gap |
- | (unmapped) | TEST_AREA | (unmapped) | (mapped page) | (1 page) | (mapped page) | (1 page) | ... | (mapped page) | (1 page) |
- | (1 page) | (unmapped, 3 pages) | (1 page) | (1 page) | | (1 page) | | | (1 page) | |
- +--------------+----------------------+--------------+----------------+--------------+----------------+--------------+-----+----------------+--------------+
- ^ ^ ^ ^ ^
- | | | | |
- +--GUARD_SIZE--+ | +-- EXTRA_MAPS points here Sufficient EXTRA_MAPS to ---+
- (PAGE_SIZE) | | reach MAX_VMA_COUNT
| |
+--- TEST_AREA_SIZE ---+
| (3 * PAGE_SIZE) |
^
|
+-- TEST_AREA starts here
Hi David,
Thanks for the reviews.
Just wondering if we could find a different name than "guard page" here, to not confuse stuff with guard ptes
Will the current "guard page" we a valid vma or just a hole?
It's a hole to prevent coincidental merging of adjacent VMAs. I can rename it to HOLE in the next revision.
Thanks, Kalesh
-- Cheers
David / dhildenb
To unsubscribe from this group and stop receiving emails from it, send an email to kernel-team+unsubscribe@android.com.