linux-kernel - [PATCH 0/3] vdso/datastore: Allow prefaulting by mlockall()

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Message-Id: <20250812-vdso-mlockall-v1-0-2f49ba7cf819@linutronix.de>
Date: Tue, 12 Aug 2025 08:04:02 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Anna-Maria Behnsen <anna-maria@...utronix.de>, 
 Frederic Weisbecker <frederic@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, Andy Lutomirski <luto@...nel.org>, 
 Vincenzo Frascino <vincenzo.frascino@....com>
Cc: Nam Cao <namcao@...utronix.de>, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 0/3] vdso/datastore: Allow prefaulting by mlockall()

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@...utronix.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@...utronix.de>