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From: Zi Yan <zi.yan@sent.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
	Michal Hocko <mhocko@kernel.org>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Mel Gorman <mgorman@techsingularity.net>,
	John Hubbard <jhubbard@nvidia.com>,
	Mark Hairgrove <mhairgrove@nvidia.com>,
	Nitin Gupta <nigupta@nvidia.com>,
	David Nellans <dnellans@nvidia.com>, Zi Yan <ziy@nvidia.com>
Subject: [RFC PATCH 08/31] mm: add pagechain container for storing multiple pages.
Date: Fri, 15 Feb 2019 14:08:33 -0800
Message-ID: <20190215220856.29749-9-zi.yan@sent.com> (raw)
In-Reply-To: <20190215220856.29749-1-zi.yan@sent.com>

From: Zi Yan <ziy@nvidia.com>

When depositing page table pages for 1GB THPs, we need 512 PTE pages +
1 PMD page. Instead of counting and depositing 513 pages, we can use the
PMD page as a leader page and chain the rest 512 PTE pages with ->lru.
This, however, prevents us depositing PMD pages with ->lru, which is
currently used by depositing PTE pages for 2MB THPs. So add a new
pagechain container for PMD pages.

Signed-off-by: Zi Yan <ziy@nvidia.com>
---
 include/linux/pagechain.h | 73 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 include/linux/pagechain.h

diff --git a/include/linux/pagechain.h b/include/linux/pagechain.h
new file mode 100644
index 000000000000..be536142b413
--- /dev/null
+++ b/include/linux/pagechain.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * include/linux/pagechain.h
+ *
+ * In many places it is efficient to batch an operation up against multiple
+ * pages. A pagechain is a multipage container which is used for that.
+ */
+
+#ifndef _LINUX_PAGECHAIN_H
+#define _LINUX_PAGECHAIN_H
+
+#include <linux/slab.h>
+
+/* 14 pointers + two long's align the pagechain structure to a power of two */
+#define PAGECHAIN_SIZE	13
+
+struct page;
+
+struct pagechain {
+	struct list_head list;
+	unsigned int nr;
+	struct page *pages[PAGECHAIN_SIZE];
+};
+
+static inline void pagechain_init(struct pagechain *pchain)
+{
+	pchain->nr = 0;
+	INIT_LIST_HEAD(&pchain->list);
+}
+
+static inline void pagechain_reinit(struct pagechain *pchain)
+{
+	pchain->nr = 0;
+}
+
+static inline unsigned int pagechain_count(struct pagechain *pchain)
+{
+	return pchain->nr;
+}
+
+static inline unsigned int pagechain_space(struct pagechain *pchain)
+{
+	return PAGECHAIN_SIZE - pchain->nr;
+}
+
+static inline bool pagechain_empty(struct pagechain *pchain)
+{
+	return pchain->nr == 0;
+}
+
+/*
+ * Add a page to a pagechain.  Returns the number of slots still available.
+ */
+static inline unsigned int pagechain_deposit(struct pagechain *pchain, struct page *page)
+{
+	VM_BUG_ON(!pagechain_space(pchain));
+	pchain->pages[pchain->nr++] = page;
+	return pagechain_space(pchain);
+}
+
+static inline struct page *pagechain_withdraw(struct pagechain *pchain)
+{
+	if (!pagechain_count(pchain))
+		return NULL;
+	return pchain->pages[--pchain->nr];
+}
+
+void __init pagechain_cache_init(void);
+struct pagechain *pagechain_alloc(void);
+void pagechain_free(struct pagechain *pchain);
+
+#endif /* _LINUX_PAGECHAIN_H */
+
-- 
2.20.1


  parent reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-15 22:08 [RFC PATCH 00/31] Generating physically contiguous memory after page allocation Zi Yan
2019-02-15 22:08 ` [RFC PATCH 01/31] mm: migrate: Add exchange_pages to exchange two lists of pages Zi Yan
2019-02-17 11:29   ` Matthew Wilcox
2019-02-18 17:31     ` Zi Yan
2019-02-18 17:42       ` Vlastimil Babka
2019-02-18 17:51         ` Zi Yan
2019-02-18 17:52           ` Matthew Wilcox
2019-02-18 17:59             ` Zi Yan
2019-02-19  7:42               ` Anshuman Khandual
2019-02-19 12:56                 ` Matthew Wilcox
2019-02-20  4:38                   ` Anshuman Khandual
2019-03-14  2:39                     ` Zi Yan
2019-02-21 21:10   ` Jerome Glisse
2019-02-21 21:25     ` Zi Yan
2019-02-15 22:08 ` [RFC PATCH 02/31] mm: migrate: Add THP exchange support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 03/31] mm: migrate: Add tmpfs " Zi Yan
2019-02-15 22:08 ` [RFC PATCH 04/31] mm: add mem_defrag functionality Zi Yan
2019-02-15 22:08 ` [RFC PATCH 05/31] mem_defrag: split a THP if either src or dst is THP only Zi Yan
2019-02-15 22:08 ` [RFC PATCH 06/31] mm: Make MAX_ORDER configurable in Kconfig for buddy allocator Zi Yan
2019-02-15 22:08 ` [RFC PATCH 07/31] mm: deallocate pages with order > MAX_ORDER Zi Yan
2019-02-15 22:08 ` Zi Yan [this message]
2019-02-15 22:08 ` [RFC PATCH 09/31] mm: thp: 1GB anonymous page implementation Zi Yan
2019-02-15 22:08 ` [RFC PATCH 10/31] mm: proc: add 1GB THP kpageflag Zi Yan
2019-02-15 22:08 ` [RFC PATCH 11/31] mm: debug: print compound page order in dump_page() Zi Yan
2019-02-15 22:08 ` [RFC PATCH 12/31] mm: stats: Separate PMD THP and PUD THP stats Zi Yan
2019-02-15 22:08 ` [RFC PATCH 13/31] mm: thp: 1GB THP copy on write implementation Zi Yan
2019-02-15 22:08 ` [RFC PATCH 14/31] mm: thp: handling 1GB THP reference bit Zi Yan
2019-02-15 22:08 ` [RFC PATCH 15/31] mm: thp: add 1GB THP split_huge_pud_page() function Zi Yan
2019-02-15 22:08 ` [RFC PATCH 16/31] mm: thp: check compound_mapcount of PMD-mapped PUD THPs at free time Zi Yan
2019-02-15 22:08 ` [RFC PATCH 17/31] mm: thp: split properly PMD-mapped PUD THP to PTE-mapped PUD THP Zi Yan
2019-02-15 22:08 ` [RFC PATCH 18/31] mm: page_vma_walk: teach it about PMD-mapped " Zi Yan
2019-02-15 22:08 ` [RFC PATCH 19/31] mm: thp: 1GB THP support in try_to_unmap() Zi Yan
2019-02-15 22:08 ` [RFC PATCH 20/31] mm: thp: split 1GB THPs at page reclaim Zi Yan
2019-02-15 22:08 ` [RFC PATCH 21/31] mm: thp: 1GB zero page shrinker Zi Yan
2019-02-15 22:08 ` [RFC PATCH 22/31] mm: thp: 1GB THP follow_p*d_page() support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 23/31] mm: support 1GB THP pagemap support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 24/31] sysctl: add an option to only print the head page virtual address Zi Yan
2019-02-15 22:08 ` [RFC PATCH 25/31] mm: thp: add a knob to enable/disable 1GB THPs Zi Yan
2019-02-15 22:08 ` [RFC PATCH 26/31] mm: thp: promote PTE-mapped THP to PMD-mapped THP Zi Yan
2019-02-15 22:08 ` [RFC PATCH 27/31] mm: thp: promote PMD-mapped PUD pages to PUD-mapped PUD pages Zi Yan
2019-02-15 22:08 ` [RFC PATCH 28/31] mm: vmstats: add page promotion stats Zi Yan
2019-02-15 22:08 ` [RFC PATCH 29/31] mm: madvise: add madvise options to split PMD and PUD THPs Zi Yan
2019-02-15 22:08 ` [RFC PATCH 30/31] mm: mem_defrag: thp: PMD THP and PUD THP in-place promotion support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 31/31] sysctl: toggle to promote PUD-mapped 1GB THP or not Zi Yan
2019-02-20  1:42 ` [RFC PATCH 00/31] Generating physically contiguous memory after page allocation Mike Kravetz
2019-02-20  2:33   ` Zi Yan
2019-02-20  3:18     ` Mike Kravetz
2019-02-20  5:19       ` Zi Yan
2019-02-20  5:27         ` Mike Kravetz

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