Hello Nick, On 1/3/23 04:28, Nick Gregory wrote:
Bring in prctl man page changes from the patch set by Colin Cross <ccross@xxxxxxxxxx> [0], and document the corresponding virtual names in proc. Signed-off-by: Nick Gregory <nick@xxxxxxxxxxxxxx>
Please add Colin (and whoever was interested in the patch, which seems to be at least Suren and Kees) to the Cc tags.
Cheers, Alex
[0] https://lore.kernel.org/linux-mm/20211019215511.3771969-2-surenb@xxxxxxxxxx/ --- man2/prctl.2 | 35 +++++++++++++++++++++++++++++++++++ man5/proc.5 | 14 ++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/man2/prctl.2 b/man2/prctl.2 index 74f86ff49..82b8a1b02 100644 --- a/man2/prctl.2 +++ b/man2/prctl.2 @@ -769,6 +769,41 @@ This feature is available only if the kernel is built with the .B CONFIG_CHECKPOINT_RESTORE option enabled. .RE +.\" prctl PR_SET_VMA +.TP +.BR PR_SET_VMA " (since Linux 5.17)" +.\" Commit 9a10064f5625d5572c3626c1516e0bebc6c9fe9b +Sets an attribute specified in +.I arg2 +for virtual memory areas starting from +the address specified in +.I arg3 +and spanning the size specified in +.IR arg4 . +.I arg5 +specifies the value of the attribute to be set. +.IP +Note that assigning an attribute to a virtual memory +area might prevent it from being merged with adjacent virtual +memory areas due to the difference in that attribute's value. +.IP +Currently, +.I arg2 +must be one of: +.RS +.TP +.B PR_SET_VMA_ANON_NAME +Set a name for anonymous virtual memory areas. +.I arg5 +should be a pointer to a null-terminated string containing the +name. The name length including null byte cannot exceed +80 bytes. If +.I arg5 +is NULL, the name of the appropriate +anonymous virtual memory areas will be reset. +The name can contain only printable ascii characters +(including space), except '[',']','\','$' and '`'. +.RE .\" prctl PR_MPX_ENABLE_MANAGEMENT .TP .BR PR_MPX_ENABLE_MANAGEMENT ", " PR_MPX_DISABLE_MANAGEMENT " (since Linux 3.19, removed in Linux 5.4; only on x86)" diff --git a/man5/proc.5 b/man5/proc.5 index 65a4c38e3..e0a64d486 100644 --- a/man5/proc.5 +++ b/man5/proc.5 @@ -1372,6 +1372,20 @@ See .TP .I [heap] The process's heap. +.TP +.IR [anon: name ] " (since Linux 5.17)" +.\" Commit 9a10064f5625d5572c3626c1516e0bebc6c9fe9b +A named private anonymous mapping. +Set with +.BR prctl (2) +.BR PR_SET_VMA_ANON_NAME . +.TP +.IR [anon_shmem: name ] " (since Linux 6.2)" +.\" Commit d09e8ca6cb93bb4b97517a18fbbf7eccb0e9ff43 +A named shared anonymous mapping. +Set with +.BR prctl (2) +.BR PR_SET_VMA_ANON_NAME . .in .RE .IP
-- <http://www.alejandro-colomar.es/>
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