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docs/vm: pagemap: formatting and spelling updates 

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mike Rapoport 2018-04-18 11:07:46 +03:00 committed by Jonathan Corbet
parent 946280cdfc
commit 86207d9a90
1 changed files with 8 additions and 8 deletions
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16
Documentation/vm/pagemap.rst
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@ -13,7 +13,7 @@ There are four components to pagemap:
* ``/proc/pid/pagemap``. This file lets a userspace process find out which * ``/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 physical frame each virtual page is mapped to. It contains one 64-bit
value for each virtual page, containing the following data (from 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 0-54 page frame number (PFN) if present
* Bits 0-4 swap type if swapped * 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 precisely which pages are mapped (or in swap) and comparing mapped
pages between processes. 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 determine which areas of memory are actually mapped and llseek to
skip over unmapped regions. 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 memory cgroup each page is charged to, indexed by PFN. Only available when
CONFIG_MEMCG is set. CONFIG_MEMCG is set.
Short descriptions to the page flags: Short descriptions to the page flags
===================================== ====================================
0 - LOCKED 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 7 - SLAB
page is managed by the SLAB/SLOB/SLUB/SLQB kernel memory allocator 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 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) ie. for file backed page: (in-memory data revision >= on-disk one)
4 - DIRTY 4 - DIRTY
page has been written to, hence contains new data 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 8 - WRITEBACK
page is being synced to disk page is being synced to disk
@ -145,7 +145,7 @@ LRU related page flags
page is in the active LRU list page is in the active LRU list
18 - UNEVICTABLE 18 - UNEVICTABLE
page is in the unevictable (non-)LRU list It is somehow pinned and 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 shmctl(SHM_LOCK) and mlock() memory segments
2 - REFERENCED 2 - REFERENCED
page has been referenced since last LRU list enqueue/requeue page has been referenced since last LRU list enqueue/requeue
@ -156,7 +156,7 @@ LRU related page flags
12 - ANON 12 - ANON
a memory mapped page that is not part of a file a memory mapped page that is not part of a file
13 - SWAPCACHE 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 14 - SWAPBACKED
page is backed by swap/RAM page is backed by swap/RAM