korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-23 12:14:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

mm, pagemap: remove SLOB and SLQB from comments and documentation

Browse Source 
SLOB has been removed and SLQB never merged, so remove their mentions
from comments and documentation of pagemap.

In stable_page_flags() also correct an outdated comment mentioning that
PageBuddy() means a page->_refcount of -1, and remove compound_head()
from the PageSlab() call, as that's already implicitly there thanks to
PF_NO_TAIL.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
This commit is contained in:
Vlastimil Babka 2023-02-28 11:07:44 +01:00
parent c4ba69f00c
commit d88e2a2bd2
2 changed files with 7 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/admin-guide/mm/pagemap.rst
View File

@ -91,9 +91,9 @@ Short descriptions to the page flags
The page is being locked for exclusive access, e.g. by undergoing read/write
IO.
7 - SLAB
The 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
page; SLOB will not flag it at all.
The page is managed by the SLAB/SLUB kernel memory allocator.
When compound page is used, either will only set this flag on the head
page.
10 - BUDDY
A free memory block managed by the buddy system allocator.
The buddy system organizes free memory in blocks of various orders.

9
fs/proc/page.c
View File

@ -125,7 +125,7 @@ u64 stable_page_flags(struct page *page)
/*
* pseudo flags for the well known (anonymous) memory mapped pages
*
* Note that page->_mapcount is overloaded in SLOB/SLUB/SLQB, so the
* Note that page->_mapcount is overloaded in SLAB, so the
* simple test in page_mapped() is not enough.
*/
if (!PageSlab(page) && page_mapped(page))
@ -165,9 +165,8 @@ u64 stable_page_flags(struct page *page)
/*
* Caveats on high order pages: page->_refcount will only be set
* -1 on the head page; SLUB/SLQB do the same for PG_slab;
* SLOB won't set PG_slab at all on compound pages.
* Caveats on high order pages: PG_buddy and PG_slab will only be set
* on the head page.
*/
if (PageBuddy(page))
u |= 1 << KPF_BUDDY;
@ -185,7 +184,7 @@ u64 stable_page_flags(struct page *page)
u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked);
u |= kpf_copy_bit(k, KPF_SLAB, PG_slab);
if (PageTail(page) && PageSlab(compound_head(page)))
if (PageTail(page) && PageSlab(page))
u |= 1 << KPF_SLAB;
u |= kpf_copy_bit(k, KPF_ERROR, PG_error);