mm: enable page allocation tagging

Redefine page allocators to record allocation tags upon their invocation. 
Instrument post_alloc_hook and free_pages_prepare to modify current
allocation tag.

[surenb@google.com: undo _noprof additions in the documentation]
  Link: https://lkml.kernel.org/r/20240326231453.1206227-3-surenb@google.com
Link: https://lkml.kernel.org/r/20240321163705.3067592-19-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Co-developed-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Kees Cook <keescook@chromium.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alex Gaynor <alex.gaynor@gmail.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andreas Hindborg <a.hindborg@samsung.com>
Cc: Benno Lossin <benno.lossin@proton.me>
Cc: "Björn Roy Baron" <bjorn3_gh@protonmail.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Gary Guo <gary@garyguo.net>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wedson Almeida Filho <wedsonaf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 23 insertions, 23 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 13100a290918..0b3def99174a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2201,9 +2201,9 @@ static struct page *alloc_pages_preferred_many(gfp_t gfp, unsigned int order,
 	 */
 	preferred_gfp = gfp | __GFP_NOWARN;
 	preferred_gfp &= ~(__GFP_DIRECT_RECLAIM | __GFP_NOFAIL);
-	page = __alloc_pages(preferred_gfp, order, nid, nodemask);
+	page = __alloc_pages_noprof(preferred_gfp, order, nid, nodemask);
 	if (!page)
-		page = __alloc_pages(gfp, order, nid, NULL);
+		page = __alloc_pages_noprof(gfp, order, nid, NULL);
 
 	return page;
 }
@@ -2218,7 +2218,7 @@ static struct page *alloc_pages_preferred_many(gfp_t gfp, unsigned int order,
  *
  * Return: The page on success or NULL if allocation fails.
  */
-struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order,
+struct page *alloc_pages_mpol_noprof(gfp_t gfp, unsigned int order,
 		struct mempolicy *pol, pgoff_t ilx, int nid)
 {
 	nodemask_t *nodemask;
@@ -2249,7 +2249,7 @@ struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order,
 			 * First, try to allocate THP only on local node, but
 			 * don't reclaim unnecessarily, just compact.
 			 */
-			page = __alloc_pages_node(nid,
+			page = __alloc_pages_node_noprof(nid,
 				gfp | __GFP_THISNODE | __GFP_NORETRY, order);
 			if (page || !(gfp & __GFP_DIRECT_RECLAIM))
 				return page;
@@ -2262,7 +2262,7 @@ struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order,
 		}
 	}
 
-	page = __alloc_pages(gfp, order, nid, nodemask);
+	page = __alloc_pages_noprof(gfp, order, nid, nodemask);
 
 	if (unlikely(pol->mode == MPOL_INTERLEAVE) && page) {
 		/* skip NUMA_INTERLEAVE_HIT update if numa stats is disabled */
@@ -2293,7 +2293,7 @@ struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order,
  *
  * Return: The folio on success or NULL if allocation fails.
  */
-struct folio *vma_alloc_folio(gfp_t gfp, int order, struct vm_area_struct *vma,
+struct folio *vma_alloc_folio_noprof(gfp_t gfp, int order, struct vm_area_struct *vma,
 		unsigned long addr, bool hugepage)
 {
 	struct mempolicy *pol;
@@ -2301,12 +2301,12 @@ struct folio *vma_alloc_folio(gfp_t gfp, int order, struct vm_area_struct *vma,
 	struct page *page;
 
 	pol = get_vma_policy(vma, addr, order, &ilx);
-	page = alloc_pages_mpol(gfp | __GFP_COMP, order,
-				pol, ilx, numa_node_id());
+	page = alloc_pages_mpol_noprof(gfp | __GFP_COMP, order,
+				       pol, ilx, numa_node_id());
 	mpol_cond_put(pol);
 	return page_rmappable_folio(page);
 }
-EXPORT_SYMBOL(vma_alloc_folio);
+EXPORT_SYMBOL(vma_alloc_folio_noprof);
 
 /**
  * alloc_pages - Allocate pages.
@@ -2322,7 +2322,7 @@ EXPORT_SYMBOL(vma_alloc_folio);
  * flags are used.
  * Return: The page on success or NULL if allocation fails.
  */
-struct page *alloc_pages(gfp_t gfp, unsigned int order)
+struct page *alloc_pages_noprof(gfp_t gfp, unsigned int order)
 {
 	struct mempolicy *pol = &default_policy;
 
@@ -2333,16 +2333,16 @@ struct page *alloc_pages(gfp_t gfp, unsigned int order)
 	if (!in_interrupt() && !(gfp & __GFP_THISNODE))
 		pol = get_task_policy(current);
 
-	return alloc_pages_mpol(gfp, order,
-				pol, NO_INTERLEAVE_INDEX, numa_node_id());
+	return alloc_pages_mpol_noprof(gfp, order, pol, NO_INTERLEAVE_INDEX,
+				       numa_node_id());
 }
-EXPORT_SYMBOL(alloc_pages);
+EXPORT_SYMBOL(alloc_pages_noprof);
 
-struct folio *folio_alloc(gfp_t gfp, unsigned int order)
+struct folio *folio_alloc_noprof(gfp_t gfp, unsigned int order)
 {
-	return page_rmappable_folio(alloc_pages(gfp | __GFP_COMP, order));
+	return page_rmappable_folio(alloc_pages_noprof(gfp | __GFP_COMP, order));
 }
-EXPORT_SYMBOL(folio_alloc);
+EXPORT_SYMBOL(folio_alloc_noprof);
 
 static unsigned long alloc_pages_bulk_array_interleave(gfp_t gfp,
 		struct mempolicy *pol, unsigned long nr_pages,
@@ -2361,13 +2361,13 @@ static unsigned long alloc_pages_bulk_array_interleave(gfp_t gfp,
 
 	for (i = 0; i < nodes; i++) {
 		if (delta) {
-			nr_allocated = __alloc_pages_bulk(gfp,
+			nr_allocated = alloc_pages_bulk_noprof(gfp,
 					interleave_nodes(pol), NULL,
 					nr_pages_per_node + 1, NULL,
 					page_array);
 			delta--;
 		} else {
-			nr_allocated = __alloc_pages_bulk(gfp,
+			nr_allocated = alloc_pages_bulk_noprof(gfp,
 					interleave_nodes(pol), NULL,
 					nr_pages_per_node, NULL, page_array);
 		}
@@ -2504,11 +2504,11 @@ static unsigned long alloc_pages_bulk_array_preferred_many(gfp_t gfp, int nid,
 	preferred_gfp = gfp | __GFP_NOWARN;
 	preferred_gfp &= ~(__GFP_DIRECT_RECLAIM | __GFP_NOFAIL);
 
-	nr_allocated  = __alloc_pages_bulk(preferred_gfp, nid, &pol->nodes,
+	nr_allocated  = alloc_pages_bulk_noprof(preferred_gfp, nid, &pol->nodes,
 					   nr_pages, NULL, page_array);
 
 	if (nr_allocated < nr_pages)
-		nr_allocated += __alloc_pages_bulk(gfp, numa_node_id(), NULL,
+		nr_allocated += alloc_pages_bulk_noprof(gfp, numa_node_id(), NULL,
 				nr_pages - nr_allocated, NULL,
 				page_array + nr_allocated);
 	return nr_allocated;
@@ -2520,7 +2520,7 @@ static unsigned long alloc_pages_bulk_array_preferred_many(gfp_t gfp, int nid,
  * It can accelerate memory allocation especially interleaving
  * allocate memory.
  */
-unsigned long alloc_pages_bulk_array_mempolicy(gfp_t gfp,
+unsigned long alloc_pages_bulk_array_mempolicy_noprof(gfp_t gfp,
 		unsigned long nr_pages, struct page **page_array)
 {
 	struct mempolicy *pol = &default_policy;
@@ -2544,8 +2544,8 @@ unsigned long alloc_pages_bulk_array_mempolicy(gfp_t gfp,
 
 	nid = numa_node_id();
 	nodemask = policy_nodemask(gfp, pol, NO_INTERLEAVE_INDEX, &nid);
-	return __alloc_pages_bulk(gfp, nid, nodemask,
-				  nr_pages, NULL, page_array);
+	return alloc_pages_bulk_noprof(gfp, nid, nodemask,
+				       nr_pages, NULL, page_array);
 }
 
 int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)