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, 26 insertions, 26 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3fd273c22749..d3afaf8f983a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4391,7 +4391,7 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
  *
  * Returns the number of pages on the list or array.
  */
-unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
+unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid,
 			nodemask_t *nodemask, int nr_pages,
 			struct list_head *page_list,
 			struct page **page_array)
@@ -4527,7 +4527,7 @@ failed_irq:
 	pcp_trylock_finish(UP_flags);
 
 failed:
-	page = __alloc_pages(gfp, 0, preferred_nid, nodemask);
+	page = __alloc_pages_noprof(gfp, 0, preferred_nid, nodemask);
 	if (page) {
 		if (page_list)
 			list_add(&page->lru, page_list);
@@ -4538,13 +4538,13 @@ failed:
 
 	goto out;
 }
-EXPORT_SYMBOL_GPL(__alloc_pages_bulk);
+EXPORT_SYMBOL_GPL(alloc_pages_bulk_noprof);
 
 /*
  * This is the 'heart' of the zoned buddy allocator.
  */
-struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
-							nodemask_t *nodemask)
+struct page *__alloc_pages_noprof(gfp_t gfp, unsigned int order,
+				      int preferred_nid, nodemask_t *nodemask)
 {
 	struct page *page;
 	unsigned int alloc_flags = ALLOC_WMARK_LOW;
@@ -4606,38 +4606,38 @@ out:
 
 	return page;
 }
-EXPORT_SYMBOL(__alloc_pages);
+EXPORT_SYMBOL(__alloc_pages_noprof);
 
-struct folio *__folio_alloc(gfp_t gfp, unsigned int order, int preferred_nid,
+struct folio *__folio_alloc_noprof(gfp_t gfp, unsigned int order, int preferred_nid,
 		nodemask_t *nodemask)
 {
-	struct page *page = __alloc_pages(gfp | __GFP_COMP, order,
+	struct page *page = __alloc_pages_noprof(gfp | __GFP_COMP, order,
 					preferred_nid, nodemask);
 	return page_rmappable_folio(page);
 }
-EXPORT_SYMBOL(__folio_alloc);
+EXPORT_SYMBOL(__folio_alloc_noprof);
 
 /*
  * Common helper functions. Never use with __GFP_HIGHMEM because the returned
  * address cannot represent highmem pages. Use alloc_pages and then kmap if
  * you need to access high mem.
  */
-unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order)
+unsigned long get_free_pages_noprof(gfp_t gfp_mask, unsigned int order)
 {
 	struct page *page;
 
-	page = alloc_pages(gfp_mask & ~__GFP_HIGHMEM, order);
+	page = alloc_pages_noprof(gfp_mask & ~__GFP_HIGHMEM, order);
 	if (!page)
 		return 0;
 	return (unsigned long) page_address(page);
 }
-EXPORT_SYMBOL(__get_free_pages);
+EXPORT_SYMBOL(get_free_pages_noprof);
 
-unsigned long get_zeroed_page(gfp_t gfp_mask)
+unsigned long get_zeroed_page_noprof(gfp_t gfp_mask)
 {
-	return __get_free_page(gfp_mask | __GFP_ZERO);
+	return get_free_pages_noprof(gfp_mask | __GFP_ZERO, 0);
 }
-EXPORT_SYMBOL(get_zeroed_page);
+EXPORT_SYMBOL(get_zeroed_page_noprof);
 
 /**
  * __free_pages - Free pages allocated with alloc_pages().
@@ -4853,7 +4853,7 @@ static void *make_alloc_exact(unsigned long addr, unsigned int order,
  *
  * Return: pointer to the allocated area or %NULL in case of error.
  */
-void *alloc_pages_exact(size_t size, gfp_t gfp_mask)
+void *alloc_pages_exact_noprof(size_t size, gfp_t gfp_mask)
 {
 	unsigned int order = get_order(size);
 	unsigned long addr;
@@ -4861,10 +4861,10 @@ void *alloc_pages_exact(size_t size, gfp_t gfp_mask)
 	if (WARN_ON_ONCE(gfp_mask & (__GFP_COMP | __GFP_HIGHMEM)))
 		gfp_mask &= ~(__GFP_COMP | __GFP_HIGHMEM);
 
-	addr = __get_free_pages(gfp_mask, order);
+	addr = get_free_pages_noprof(gfp_mask, order);
 	return make_alloc_exact(addr, order, size);
 }
-EXPORT_SYMBOL(alloc_pages_exact);
+EXPORT_SYMBOL(alloc_pages_exact_noprof);
 
 /**
  * alloc_pages_exact_nid - allocate an exact number of physically-contiguous
@@ -4878,7 +4878,7 @@ EXPORT_SYMBOL(alloc_pages_exact);
  *
  * Return: pointer to the allocated area or %NULL in case of error.
  */
-void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
+void * __meminit alloc_pages_exact_nid_noprof(int nid, size_t size, gfp_t gfp_mask)
 {
 	unsigned int order = get_order(size);
 	struct page *p;
@@ -4886,7 +4886,7 @@ void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
 	if (WARN_ON_ONCE(gfp_mask & (__GFP_COMP | __GFP_HIGHMEM)))
 		gfp_mask &= ~(__GFP_COMP | __GFP_HIGHMEM);
 
-	p = alloc_pages_node(nid, gfp_mask, order);
+	p = alloc_pages_node_noprof(nid, gfp_mask, order);
 	if (!p)
 		return NULL;
 	return make_alloc_exact((unsigned long)page_address(p), order, size);
@@ -6343,7 +6343,7 @@ int __alloc_contig_migrate_range(struct compact_control *cc,
  * pages which PFN is in [start, end) are allocated for the caller and
  * need to be freed with free_contig_range().
  */
-int alloc_contig_range(unsigned long start, unsigned long end,
+int alloc_contig_range_noprof(unsigned long start, unsigned long end,
 		       unsigned migratetype, gfp_t gfp_mask)
 {
 	unsigned long outer_start, outer_end;
@@ -6467,15 +6467,15 @@ done:
 	undo_isolate_page_range(start, end, migratetype);
 	return ret;
 }
-EXPORT_SYMBOL(alloc_contig_range);
+EXPORT_SYMBOL(alloc_contig_range_noprof);
 
 static int __alloc_contig_pages(unsigned long start_pfn,
 				unsigned long nr_pages, gfp_t gfp_mask)
 {
 	unsigned long end_pfn = start_pfn + nr_pages;
 
-	return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE,
-				  gfp_mask);
+	return alloc_contig_range_noprof(start_pfn, end_pfn, MIGRATE_MOVABLE,
+				   gfp_mask);
 }
 
 static bool pfn_range_valid_contig(struct zone *z, unsigned long start_pfn,
@@ -6530,8 +6530,8 @@ static bool zone_spans_last_pfn(const struct zone *zone,
  *
  * Return: pointer to contiguous pages on success, or NULL if not successful.
  */
-struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask,
-				int nid, nodemask_t *nodemask)
+struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_mask,
+				 int nid, nodemask_t *nodemask)
 {
 	unsigned long ret, pfn, flags;
 	struct zonelist *zonelist;