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authorPavel Tatashin <pasha.tatashin@soleen.com>2021-05-04 18:38:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-05-05 11:27:26 -0700
commitda6df1b0fcfa97b2e3394df8622128bb810e1093 (patch)
tree026c34e82e3d0352f1472b6909d67ede3abf7685 /mm
parent1a08ae36cf8b5f26d0c64ebfe46f8eb07ea0b678 (diff)
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mm: apply per-task gfp constraints in fast path
Function current_gfp_context() is called after fast path. However, soon we will add more constraints which will also limit zones based on context. Move this call into fast path, and apply the correct constraints for all allocations. Also update .reclaim_idx based on value returned by current_gfp_context() because it soon will modify the allowed zones. Note: With this patch we will do one extra current->flags load during fast path, but we already load current->flags in fast-path: __alloc_pages() prepare_alloc_pages() current_alloc_flags(gfp_mask, *alloc_flags); Later, when we add the zone constrain logic to current_gfp_context() we will be able to remove current->flags load from current_alloc_flags, and therefore return fast-path to the current performance level. Link: https://lkml.kernel.org/r/20210215161349.246722-7-pasha.tatashin@soleen.com Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Suggested-by: Michal Hocko <mhocko@kernel.org> 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: 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>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c2fc6a64bef9..3c55eaafede1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5180,6 +5180,13 @@ struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
}
gfp &= gfp_allowed_mask;
+ /*
+ * 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}.
+ */
+ gfp = current_gfp_context(gfp);
alloc_gfp = gfp;
if (!prepare_alloc_pages(gfp, order, preferred_nid, nodemask, &ac,
&alloc_gfp, &alloc_flags))
@@ -5196,13 +5203,7 @@ struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
if (likely(page))
goto out;
- /*
- * 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}.
- */
- alloc_gfp = current_gfp_context(gfp);
+ alloc_gfp = gfp;
ac.spread_dirty_pages = false;
/*