diff options
| author | David Hildenbrand <david@redhat.com> | 2025-08-15 16:54:55 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-09-14 02:55:05 +0300 |
| commit | 8cdc4d27019356b0304308eb799484c899b62a87 (patch) | |
| tree | 414259af7af5c19763f6f7fd98ee5cb5d6130a87 /include/uapi | |
| parent | 1f1c061089dcd274befa0c76fb9f6e253a8368c0 (diff) | |
| download | linux-8cdc4d27019356b0304308eb799484c899b62a87.tar.xz | |
mm/huge_memory: respect MADV_COLLAPSE with PR_THP_DISABLE_EXCEPT_ADVISED
Let's allow for making MADV_COLLAPSE succeed on areas that neither have
VM_HUGEPAGE nor VM_NOHUGEPAGE when we have THP disabled unless explicitly
advised (PR_THP_DISABLE_EXCEPT_ADVISED).
MADV_COLLAPSE is a clear advice that we want to collapse.
Note that we still respect the VM_NOHUGEPAGE flag, just like
MADV_COLLAPSE always does. So consequently, MADV_COLLAPSE is now only
refused on VM_NOHUGEPAGE with PR_THP_DISABLE_EXCEPT_ADVISED,
including for shmem.
Link: https://lkml.kernel.org/r/20250815135549.130506-4-usamaarif642@gmail.com
Co-developed-by: Usama Arif <usamaarif642@gmail.com>
Signed-off-by: Usama Arif <usamaarif642@gmail.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Barry Song <baohua@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yafang <laoar.shao@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/prctl.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h index 150b6deebfb1..51c4e8c82b1e 100644 --- a/include/uapi/linux/prctl.h +++ b/include/uapi/linux/prctl.h @@ -185,7 +185,7 @@ struct prctl_mm_map { #define PR_SET_THP_DISABLE 41 /* * Don't disable THPs when explicitly advised (e.g., MADV_HUGEPAGE / - * VM_HUGEPAGE). + * VM_HUGEPAGE, MADV_COLLAPSE). */ # define PR_THP_DISABLE_EXCEPT_ADVISED (1 << 1) #define PR_GET_THP_DISABLE 42 |