The patch titled
Subject: Documentation/filesystems/proc.txt: describe /proc/<pid>/map_files
has been added to the -mm tree. Its filename is
docs-procs-describe-proc-pid-map_files-entry.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/docs-procs-describe-proc-pid-map_files-entry.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/docs-procs-describe-proc-pid-map_files-entry.patch
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------------------------------------------------------
From: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Subject: Documentation/filesystems/proc.txt: describe /proc/<pid>/map_files
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Calvin Owens <calvinowens@xxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff -puN Documentation/filesystems/proc.txt~docs-procs-describe-proc-pid-map_files-entry Documentation/filesystems/proc.txt
--- a/Documentation/filesystems/proc.txt~docs-procs-describe-proc-pid-map_files-entry
+++ a/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
------------------------------------------------------------------------------
_
Patches currently in -mm which might be from gorcunov@xxxxxxxxxx are
mm-pagemap-limit-scan-to-virtual-region-being-asked.patch
arm-define-__pagetable_pmd_folded-for-lpae.patch
mm-account-pmd-page-tables-to-the-process.patch
proc-pagemap-walk-page-tables-under-pte-lock.patch
mm-pagewalk-remove-pgd_entry-and-pud_entry.patch
pagewalk-improve-vma-handling.patch
pagewalk-add-walk_page_vma.patch
smaps-remove-mem_size_stats-vma-and-use-walk_page_vma.patch
clear_refs-remove-clear_refs_private-vma-and-introduce-clear_refs_test_walk.patch
pagemap-use-walk-vma-instead-of-calling-find_vma.patch
numa_maps-fix-typo-in-gather_hugetbl_stats.patch
numa_maps-remove-numa_maps-vma.patch
memcg-cleanup-preparation-for-page-table-walk.patch
arch-powerpc-mm-subpage-protc-use-walk-vma-and-walk_page_vma.patch
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
mm-proc-pid-clear_refs-avoid-split_huge_page.patch
mincore-apply-page-table-walker-on-do_mincore.patch
docs-procs-describe-proc-pid-map_files-entry.patch
docs-procs-describe-proc-pid-map_files-entry-fix.patch
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