linux-kernel - [PATCH v4 3/4] ioctl_userfaultfd.2: Add UFFD_FEATURE_THREAD

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Message-Id: <20210322220848.52162-4-peterx@redhat.com>
Date:   Mon, 22 Mar 2021 18:08:47 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-man@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Alejandro Colomar <alx.manpages@...il.com>, peterx@...hat.com,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v4 3/4] ioctl_userfaultfd.2: Add UFFD_FEATURE_THREAD_ID docs

UFFD_FEATURE_THREAD_ID is supported in Linux 4.14.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 man2/ioctl_userfaultfd.2 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2
index 47ae5f473..d4a8375b8 100644
--- a/man2/ioctl_userfaultfd.2
+++ b/man2/ioctl_userfaultfd.2
@@ -208,6 +208,11 @@ signal will be sent to the faulting process.
 Applications using this
 feature will not require the use of a userfaultfd monitor for processing
 memory accesses to the regions registered with userfaultfd.
+.TP
+.BR UFFD_FEATURE_THREAD_ID " (since Linux 4.14)"
+If this feature bit is set,
+.I uffd_msg.pagefault.feat.ptid
+will be set to the faulted thread ID for each page fault message.
 .PP
 The returned
 .I ioctls
-- 
2.26.2