Commit 86207d9a authored by Mike Rapoport's avatar Mike Rapoport Committed by Jonathan Corbet
Browse files

docs/vm: pagemap: formatting and spelling updates 



Signed-off-by: default avatarMike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 946280cd

Documentation/vm/pagemap.rst

+8 −8
Original line number Diff line number Diff line
@@ -13,7 +13,7 @@ There are four components to pagemap: 
 * ``/proc/pid/pagemap``.  This file lets a userspace process find out which

   physical frame each virtual page is mapped to.  It contains one 64-bit

   value for each virtual page, containing the following data (from

   fs/proc/task_mmu.c, above pagemap_read):

   ``fs/proc/task_mmu.c``, above pagemap_read):



    * Bits 0-54  page frame number (PFN) if present

    * Bits 0-4   swap type if swapped
@@ -36,7 +36,7 @@ There are four components to pagemap: 
   precisely which pages are mapped (or in swap) and comparing mapped

   pages between processes.



   Efficient users of this interface will use /proc/pid/maps to

   Efficient users of this interface will use ``/proc/pid/maps`` to

   determine which areas of memory are actually mapped and llseek to

   skip over unmapped regions.
@@ -79,11 +79,11 @@ There are four components to pagemap: 
   memory cgroup each page is charged to, indexed by PFN. Only available when

   CONFIG_MEMCG is set.



Short descriptions to the page flags:

=====================================

Short descriptions to the page flags

====================================



0 - LOCKED

   page is being locked for exclusive access, eg. by undergoing read/write IO

   page is being locked for exclusive access, e.g. by undergoing read/write IO

7 - SLAB

   page is managed by the SLAB/SLOB/SLUB/SLQB kernel memory allocator

   When compound page is used, SLUB/SLQB will only set this flag on the head
@@ -132,7 +132,7 @@ IO related page flags 
   ie. for file backed page: (in-memory data revision >= on-disk one)

4 - DIRTY

   page has been written to, hence contains new data

   ie. for file backed page: (in-memory data revision >  on-disk one)

   i.e. for file backed page: (in-memory data revision >  on-disk one)

8 - WRITEBACK

   page is being synced to disk
@@ -145,7 +145,7 @@ LRU related page flags 
   page is in the active LRU list

18 - UNEVICTABLE

   page is in the unevictable (non-)LRU list It is somehow pinned and

   not a candidate for LRU page reclaims, eg. ramfs pages,

   not a candidate for LRU page reclaims, e.g. ramfs pages,

   shmctl(SHM_LOCK) and mlock() memory segments

2 - REFERENCED

   page has been referenced since last LRU list enqueue/requeue
@@ -156,7 +156,7 @@ LRU related page flags 
12 - ANON

   a memory mapped page that is not part of a file

13 - SWAPCACHE

   page is mapped to swap space, ie. has an associated swap entry

   page is mapped to swap space, i.e. has an associated swap entry

14 - SWAPBACKED

   page is backed by swap/RAM