[v2] vdso/datastore: Allow prefaulting by mlockall()

[PATCH v2 0/3] vdso/datastore: Allow prefaulting by mlockall()

Thomas Weißschuh posted 3 patches 1 month ago

Diff against v1
Download series mbox

kernel/time/namespace.c |  7 ++-----
lib/vdso/datastore.c    | 38 ++++++++++++++++++++++----------------
2 files changed, 24 insertions(+), 21 deletions(-)

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[PATCH v2 0/3] vdso/datastore: Allow prefaulting by mlockall()

Posted by Thomas Weißschuh 1 month ago

Latency-sensitive applications expect not to experience any pagefaults
after calling mlockall(). However mlockall() ignores VM_PFNMAP and VM_IO
mappings, both of which are used by the generic vDSO datastore.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
Changes in v2:
- Stop using nth_page() which is being removed
- Link to v1: https://lore.kernel.org/r/20250812-vdso-mlockall-v1-0-2f49ba7cf819@linutronix.de

---
Thomas Weißschuh (3):
      vdso/datastore: Explicitly prevent remote access to timens vvar page
      vdso/datastore: Allow prefaulting by mlockall()
      vdso/datastore: Map zero page for unavailable data

 kernel/time/namespace.c |  7 ++-----
 lib/vdso/datastore.c    | 38 ++++++++++++++++++++++----------------
 2 files changed, 24 insertions(+), 21 deletions(-)
---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250721-vdso-mlockall-461bb33205b1

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@linutronix.de>