From: Sidhartha Kumar <sidhartha.kumar@oracle.com>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: akpm@linux-foundation.org, songmuchun@bytedance.com,
mike.kravetz@oracle.com, willy@infradead.org, vbabka@suse.cz,
william.kucharski@oracle.com, dhowells@redhat.com,
peterx@redhat.com, arnd@arndb.de, ccross@google.com,
hughd@google.com, ebiederm@xmission.com,
Sidhartha Kumar <sidhartha.kumar@oracle.com>
Subject: [PATCH v4 2/5] mm: add private field of first tail to struct page and struct folio
Date: Thu, 22 Sep 2022 10:42:04 -0500 [thread overview]
Message-ID: <20220922154207.1575343-3-sidhartha.kumar@oracle.com> (raw)
In-Reply-To: <20220922154207.1575343-1-sidhartha.kumar@oracle.com>
Allows struct folio to store hugetlb metadata that is contained in the
private field of the first tail page. On 32-bit, _private_1 aligns with
page[1].private.
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
---
include/linux/mm_types.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 500e536796ca..2d5b1575ffe0 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -144,6 +144,7 @@ struct page {
atomic_t compound_pincount;
#ifdef CONFIG_64BIT
unsigned int compound_nr; /* 1 << compound_order */
+ unsigned long _private_1;
#endif
};
struct { /* Second tail page of compound page */
@@ -264,6 +265,7 @@ struct page {
* @_total_mapcount: Do not use directly, call folio_entire_mapcount().
* @_pincount: Do not use directly, call folio_maybe_dma_pinned().
* @_folio_nr_pages: Do not use directly, call folio_nr_pages().
+ * @_private_1: Do not use directly, call folio_get_private_1().
*
* A folio is a physically, virtually and logically contiguous set
* of bytes. It is a power-of-two in size, and it is aligned to that
@@ -311,6 +313,7 @@ struct folio {
#ifdef CONFIG_64BIT
unsigned int _folio_nr_pages;
#endif
+ unsigned long _private_1;
};
#define FOLIO_MATCH(pg, fl) \
@@ -338,6 +341,7 @@ FOLIO_MATCH(compound_mapcount, _total_mapcount);
FOLIO_MATCH(compound_pincount, _pincount);
#ifdef CONFIG_64BIT
FOLIO_MATCH(compound_nr, _folio_nr_pages);
+FOLIO_MATCH(_private_1, _private_1);
#endif
#undef FOLIO_MATCH
@@ -383,6 +387,16 @@ static inline void *folio_get_private(struct folio *folio)
return folio->private;
}
+static inline void folio_set_private_1(struct folio *folio, unsigned long private)
+{
+ folio->_private_1 = private;
+}
+
+static inline unsigned long folio_get_private_1(struct folio *folio)
+{
+ return folio->_private_1;
+}
+
struct page_frag_cache {
void * va;
#if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE)
--
2.31.1
next prev parent reply other threads:[~2022-09-22 15:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 15:42 [PATCH v4 0/5] begin converting hugetlb code to folios Sidhartha Kumar
2022-09-22 15:42 ` [PATCH v4 1/5] mm/hugetlb: add folio support to hugetlb specific flag macros Sidhartha Kumar
2022-09-23 3:01 ` Muchun Song
2022-09-22 15:42 ` Sidhartha Kumar [this message]
2022-09-22 15:42 ` [PATCH v4 3/5] mm/hugetlb: add hugetlb_folio_subpool() helpers Sidhartha Kumar
2022-09-22 15:42 ` [PATCH v4 4/5] hugetlbfs: convert hugetlb_delete_from_page_cache() to use folios Sidhartha Kumar
2022-09-23 23:02 ` Mike Kravetz
2022-09-22 15:42 ` [PATCH v4 5/5] mm/hugetlb: add folio_hstate() Sidhartha Kumar
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