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docs/procfs: call out ioctl()-based PROCMAP_QUERY command existence

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Call out PROCMAP_QUERY ioctl() existence in the section describing
/proc/PID/maps file in documentation.  We refer user to UAPI header for
low-level details of this programmatic interface.

Link: https://lkml.kernel.org/r/20240627170900.1672542-5-andrii@kernel.org
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrii Nakryiko 2024-06-27 10:08:56 -07:00 committed by Andrew Morton
parent bfc69fd05e
commit c10cb9148e
1 changed files with 9 additions and 0 deletions
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Documentation/filesystems/proc.rst
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@ -443,6 +443,15 @@ is not associated with a file:
or if empty, the mapping is anonymous. or if empty, the mapping is anonymous.
Starting with 6.11 kernel, /proc/PID/maps provides an alternative
ioctl()-based API that gives ability to flexibly and efficiently query and
filter individual VMAs. This interface is binary and is meant for more
efficient and easy programmatic use. `struct procmap_query`, defined in
linux/fs.h UAPI header, serves as an input/output argument to the
`PROCMAP_QUERY` ioctl() command. See comments in linus/fs.h UAPI header for
details on query semantics, supported flags, data returned, and general API
usage information.
The /proc/PID/smaps is an extension based on maps, showing the memory The /proc/PID/smaps is an extension based on maps, showing the memory
consumption for each of the process's mappings. For each mapping (aka Virtual consumption for each of the process's mappings. For each mapping (aka Virtual
Memory Area, or VMA) there is a series of lines such as the following:: Memory Area, or VMA) there is a series of lines such as the following::