| Message ID | 20230317104307.29328-4-vbabka@suse.cz (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | remove SLOB and allow kfree() with kmem_cache_alloc() | expand |
On Fri, Mar 17, 2023 at 11:43:04AM +0100, Vlastimil Babka wrote: > 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 In stable_page_flags() also correct an outdated comment mentioning that 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> > --- > Documentation/admin-guide/mm/pagemap.rst | 6 +++--- > fs/proc/page.c | 9 ++++----- > 2 files changed, 7 insertions(+), 8 deletions(-) > > diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst > index b5f970dc91e7..c8f380271cad 100644 > --- a/Documentation/admin-guide/mm/pagemap.rst > +++ b/Documentation/admin-guide/mm/pagemap.rst > @@ -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. > diff --git a/fs/proc/page.c b/fs/proc/page.c > index 6249c347809a..195b077c0fac 100644 > --- a/fs/proc/page.c > +++ b/fs/proc/page.c > @@ -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); > -- > 2.39.2 >
diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst index b5f970dc91e7..c8f380271cad 100644 --- a/Documentation/admin-guide/mm/pagemap.rst +++ b/Documentation/admin-guide/mm/pagemap.rst @@ -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. diff --git a/fs/proc/page.c b/fs/proc/page.c index 6249c347809a..195b077c0fac 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -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);