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Date: Tue, 27 Jan 2015 12:41:03 +0300 From: Cyrill Gorcunov <gorcunov@...nvz.org> To: LKML <linux-kernel@...r.kernel.org> Cc: Kees Cook <keescook@...omium.org>, Andrew Morton <akpm@...ux-foundation.org>, "Kirill A. Shutemov" <kirill@...temov.name>, Calvin Owens <calvinowens@...com>, Alexey Dobriyan <adobriyan@...il.com>, Oleg Nesterov <oleg@...hat.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Al Viro <viro@...iv.linux.org.uk>, Peter Feiner <pfeiner@...gle.com>, Pavel Emelyanov <xemul@...nvz.org> Subject: [PATCH] docs: procs -- Describe /proc/<pid>/map_files entry Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org> CC: Kees Cook <keescook@...omium.org> CC: Andrew Morton <akpm@...ux-foundation.org> CC: "Kirill A. Shutemov" <kirill@...temov.name> CC: Calvin Owens <calvinowens@...com> CC: Alexey Dobriyan <adobriyan@...il.com> CC: Oleg Nesterov <oleg@...hat.com> CC: "Eric W. Biederman" <ebiederm@...ssion.com> CC: Al Viro <viro@...iv.linux.org.uk> CC: Peter Feiner <pfeiner@...gle.com> CC: Pavel Emelyanov <xemul@...nvz.org> --- Gentlemen, could you please take a look once time permit. Which questions this text raises so I could add more info here (how we use it in criu, ptrace_may_access guards?) Documentation/filesystems/proc.txt | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) Index: linux-2.6.git/Documentation/filesystems/proc.txt =================================================================== --- linux-2.6.git.orig/Documentation/filesystems/proc.txt +++ linux-2.6.git/Documentation/filesystems/proc.txt @@ -42,6 +42,7 @@ Table of Contents 3.6 /proc/<pid>/comm & /proc/<pid>/task/<tid>/comm 3.7 /proc/<pid>/task/<tid>/children - Information about task children 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file + 3.9 /proc/<pid>/map_files - Information about memory mapped files 4 Configuring procfs 4.1 Mount options @@ -1763,6 +1764,28 @@ pair provide additional information part with TIMER_ABSTIME option which will be shown in 'settime flags', but 'it_value' still exhibits timer's remaining time. +3.9 /proc/<pid>/map_files - Information about memory mapped files +--------------------------------------------------------------------- +This directory consists of simbolic links which represent memory mapped files +the process is carrying. A typical output is like the following + + | lr-------- 1 root root 64 Jan 27 11:24 333c600000-333c620000 -> /usr/lib64/ld-2.18.so + | lr-------- 1 root root 64 Jan 27 11:24 333c81f000-333c820000 -> /usr/lib64/ld-2.18.so + | lr-------- 1 root root 64 Jan 27 11:24 333c820000-333c821000 -> /usr/lib64/ld-2.18.so + | ... + | lr-------- 1 root root 64 Jan 27 11:24 35d0421000-35d0422000 -> /usr/lib64/libselinux.so.1 + | lr-------- 1 root root 64 Jan 27 11:24 400000-41a000 -> /usr/bin/ls + +The name of a link is virtual memory bounds a particular map exhibits, i.e. +vm_area_struct::vm_start-vm_area_struct::vm_end. + +The main purpose of map_files directory is to be able to retrieve a set of +memory mapped files in a fast way instead of parsing /proc/<pid>/maps or +/proc/<pid>/smaps which contain a way more records. Same time one can open(2) +mappings from the listings of two processes and comparing inodes figure out +which anonymous memory areas are actually shared. + + ------------------------------------------------------------------------------ Configuring procfs ------------------------------------------------------------------------------ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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