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mm: honor PF_MEMALLOC_PIN for all movable pages 

PF_MEMALLOC_PIN is only honored for CMA pages, extend this flag to work
for any allocations from ZONE_MOVABLE by removing __GFP_MOVABLE from
gfp_mask when this flag is passed in the current context.

Add is_pinnable_page() to return true if page is in a pinnable page.  A
pinnable page is not in ZONE_MOVABLE and not of MIGRATE_CMA type.

Link: https://lkml.kernel.org/r/20210215161349.246722-8-pasha.tatashin@soleen.com
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tyler Hicks <tyhicks@linux.microsoft.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Tatashin 2021-05-04 18:39:00 -07:00 committed by Linus Torvalds
parent da6df1b0fc
commit 8e3560d963
4 changed files with 33 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
include/linux/mm.h
View File

@ -1141,6 +1141,11 @@ static inline bool is_zone_device_page(const struct page *page)
}
#endif
static inline bool is_zone_movable_page(const struct page *page)
{
return page_zonenum(page) == ZONE_MOVABLE;
}
#ifdef CONFIG_DEV_PAGEMAP_OPS
void free_devmap_managed_page(struct page *page);
DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
@ -1550,6 +1555,19 @@ static inline unsigned long page_to_section(const struct page *page)
}
#endif
/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
#ifdef CONFIG_MIGRATION
static inline bool is_pinnable_page(struct page *page)
{
return !is_zone_movable_page(page) && !is_migrate_cma_page(page);
}
#else
static inline bool is_pinnable_page(struct page *page)
{
return true;
}
#endif
static inline void set_page_zone(struct page *page, enum zone_type zone)
{
page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);

6
include/linux/sched/mm.h
View File

@ -151,12 +151,13 @@ static inline bool in_vfork(struct task_struct *tsk)
* Applies per-task gfp context to the given allocation flags.
* PF_MEMALLOC_NOIO implies GFP_NOIO
* PF_MEMALLOC_NOFS implies GFP_NOFS
* PF_MEMALLOC_PIN implies !GFP_MOVABLE
*/
static inline gfp_t current_gfp_context(gfp_t flags)
{
unsigned int pflags = READ_ONCE(current->flags);
if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS))) {
if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS | PF_MEMALLOC_PIN))) {
/*
* NOIO implies both NOIO and NOFS and it is a weaker context
* so always make sure it makes precedence
@ -165,6 +166,9 @@ static inline gfp_t current_gfp_context(gfp_t flags)
flags &= ~(__GFP_IO | __GFP_FS);
else if (pflags & PF_MEMALLOC_NOFS)
flags &= ~__GFP_FS;
if (pflags & PF_MEMALLOC_PIN)
flags &= ~__GFP_MOVABLE;
}
return flags;
}

2
mm/hugetlb.c
View File

@ -1083,7 +1083,7 @@ static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
lockdep_assert_held(&hugetlb_lock);
list_for_each_entry(page, &h->hugepage_freelists[nid], lru) {
if (pin && is_migrate_cma_page(page))
if (pin && !is_pinnable_page(page))
continue;
if (PageHWPoison(page))

20
mm/page_alloc.c
View File

@ -3859,16 +3859,13 @@ alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask)
return alloc_flags;
}
static inline unsigned int current_alloc_flags(gfp_t gfp_mask,
unsigned int alloc_flags)
/* Must be called after current_gfp_context() which can change gfp_mask */
static inline unsigned int gfp_to_alloc_flags_cma(gfp_t gfp_mask,
unsigned int alloc_flags)
{
#ifdef CONFIG_CMA
unsigned int pflags = current->flags;
if (!(pflags & PF_MEMALLOC_PIN) &&
gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE)
if (gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE)
alloc_flags |= ALLOC_CMA;
#endif
return alloc_flags;
}
@ -4526,7 +4523,7 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
} else if (unlikely(rt_task(current)) && !in_interrupt())
alloc_flags |= ALLOC_HARDER;
alloc_flags = current_alloc_flags(gfp_mask, alloc_flags);
alloc_flags = gfp_to_alloc_flags_cma(gfp_mask, alloc_flags);
return alloc_flags;
}
@ -4828,7 +4825,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
reserve_flags = __gfp_pfmemalloc_flags(gfp_mask);
if (reserve_flags)
alloc_flags = current_alloc_flags(gfp_mask, reserve_flags);
alloc_flags = gfp_to_alloc_flags_cma(gfp_mask, reserve_flags);
/*
* Reset the nodemask and zonelist iterators if memory policies can be
@ -4997,7 +4994,7 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
if (should_fail_alloc_page(gfp_mask, order))
return false;
*alloc_flags = current_alloc_flags(gfp_mask, *alloc_flags);
*alloc_flags = gfp_to_alloc_flags_cma(gfp_mask, *alloc_flags);
/* Dirty zone balancing only done in the fast path */
ac->spread_dirty_pages = (gfp_mask & __GFP_WRITE);
@ -5184,7 +5181,8 @@ struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
* Apply scoped allocation constraints. This is mainly about GFP_NOFS
* resp. GFP_NOIO which has to be inherited for all allocation requests
* from a particular context which has been marked by
* memalloc_no{fs,io}_{save,restore}.
* memalloc_no{fs,io}_{save,restore}. And PF_MEMALLOC_PIN which ensures
* movable zones are not used during allocation.
*/
gfp = current_gfp_context(gfp);
alloc_gfp = gfp;