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From: Joao Martins <joao.m.martins@oracle.com>
To: linux-mm@kvack.org
Cc: linux-nvdimm@lists.01.org, Matthew Wilcox <willy@infradead.org>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Muchun Song <songmuchun@bytedance.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Joao Martins <joao.m.martins@oracle.com>
Subject: [PATCH RFC 8/9] RDMA/umem: batch page unpin in __ib_mem_release()
Date: Tue,  8 Dec 2020 17:29:00 +0000	[thread overview]
Message-ID: <20201208172901.17384-10-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20201208172901.17384-1-joao.m.martins@oracle.com>

Take advantage of the newly added unpin_user_pages() batched
refcount update, by calculating a page array from an SGL
(same size as the one used in ib_mem_get()) and call
unpin_user_pages() with that.

unpin_user_pages() will check on consecutive pages that belong
to the same compound page set and batch the refcount update in
a single write.

Running a test program which calls mr reg/unreg on a 1G in size
and measures cost of both operations together (in a guest using rxe)
with device-dax and hugetlbfs:

Before:
159 rounds in 5.027 sec: 31617.923 usec / round (device-dax)
466 rounds in 5.009 sec: 10748.456 usec / round (hugetlbfs)

After:
 305 rounds in 5.010 sec: 16426.047 usec / round (device-dax)
1073 rounds in 5.004 sec: 4663.622 usec / round (hugetlbfs)

We also see similar improvements on a setup with pmem and RDMA hardware.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 drivers/infiniband/core/umem.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index e9fecbdf391b..493cfdcf7381 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -44,20 +44,40 @@
 
 #include "uverbs.h"
 
+#define PAGES_PER_LIST (PAGE_SIZE / sizeof(struct page *))
+
 static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty)
 {
+	bool make_dirty = umem->writable && dirty;
+	struct page **page_list = NULL;
 	struct sg_page_iter sg_iter;
+	unsigned long nr = 0;
 	struct page *page;
 
+	page_list = (struct page **) __get_free_page(GFP_KERNEL);
+
 	if (umem->nmap > 0)
 		ib_dma_unmap_sg(dev, umem->sg_head.sgl, umem->sg_nents,
 				DMA_BIDIRECTIONAL);
 
 	for_each_sg_page(umem->sg_head.sgl, &sg_iter, umem->sg_nents, 0) {
 		page = sg_page_iter_page(&sg_iter);
-		unpin_user_pages_dirty_lock(&page, 1, umem->writable && dirty);
+		if (page_list)
+			page_list[nr++] = page;
+
+		if (!page_list) {
+			unpin_user_pages_dirty_lock(&page, 1, make_dirty);
+		} else if (nr == PAGES_PER_LIST) {
+			unpin_user_pages_dirty_lock(page_list, nr, make_dirty);
+			nr = 0;
+		}
 	}
 
+	if (nr)
+		unpin_user_pages_dirty_lock(page_list, nr, make_dirty);
+
+	if (page_list)
+		free_page((unsigned long) page_list);
 	sg_free_table(&umem->sg_head);
 }
 
@@ -212,8 +232,7 @@ struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
 		cond_resched();
 		ret = pin_user_pages_fast(cur_base,
 					  min_t(unsigned long, npages,
-						PAGE_SIZE /
-						sizeof(struct page *)),
+						PAGES_PER_LIST),
 					  gup_flags | FOLL_LONGTERM, page_list);
 		if (ret < 0)
 			goto umem_release;
-- 
2.17.1
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WARNING: multiple messages have this Message-ID
From: Joao Martins <joao.m.martins@oracle.com>
To: linux-mm@kvack.org
Cc: Dan Williams <dan.j.williams@intel.com>,
	Ira Weiny <ira.weiny@intel.com>,
	linux-nvdimm@lists.01.org, Matthew Wilcox <willy@infradead.org>,
	Jason Gunthorpe <jgg@ziepe.ca>, Jane Chu <jane.chu@oracle.com>,
	Muchun Song <songmuchun@bytedance.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Joao Martins <joao.m.martins@oracle.com>
Subject: [PATCH RFC 8/9] RDMA/umem: batch page unpin in __ib_mem_release()
Date: Tue,  8 Dec 2020 17:29:00 +0000	[thread overview]
Message-ID: <20201208172901.17384-10-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20201208172901.17384-1-joao.m.martins@oracle.com>

Take advantage of the newly added unpin_user_pages() batched
refcount update, by calculating a page array from an SGL
(same size as the one used in ib_mem_get()) and call
unpin_user_pages() with that.

unpin_user_pages() will check on consecutive pages that belong
to the same compound page set and batch the refcount update in
a single write.

Running a test program which calls mr reg/unreg on a 1G in size
and measures cost of both operations together (in a guest using rxe)
with device-dax and hugetlbfs:

Before:
159 rounds in 5.027 sec: 31617.923 usec / round (device-dax)
466 rounds in 5.009 sec: 10748.456 usec / round (hugetlbfs)

After:
 305 rounds in 5.010 sec: 16426.047 usec / round (device-dax)
1073 rounds in 5.004 sec: 4663.622 usec / round (hugetlbfs)

We also see similar improvements on a setup with pmem and RDMA hardware.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 drivers/infiniband/core/umem.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index e9fecbdf391b..493cfdcf7381 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -44,20 +44,40 @@
 
 #include "uverbs.h"
 
+#define PAGES_PER_LIST (PAGE_SIZE / sizeof(struct page *))
+
 static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty)
 {
+	bool make_dirty = umem->writable && dirty;
+	struct page **page_list = NULL;
 	struct sg_page_iter sg_iter;
+	unsigned long nr = 0;
 	struct page *page;
 
+	page_list = (struct page **) __get_free_page(GFP_KERNEL);
+
 	if (umem->nmap > 0)
 		ib_dma_unmap_sg(dev, umem->sg_head.sgl, umem->sg_nents,
 				DMA_BIDIRECTIONAL);
 
 	for_each_sg_page(umem->sg_head.sgl, &sg_iter, umem->sg_nents, 0) {
 		page = sg_page_iter_page(&sg_iter);
-		unpin_user_pages_dirty_lock(&page, 1, umem->writable && dirty);
+		if (page_list)
+			page_list[nr++] = page;
+
+		if (!page_list) {
+			unpin_user_pages_dirty_lock(&page, 1, make_dirty);
+		} else if (nr == PAGES_PER_LIST) {
+			unpin_user_pages_dirty_lock(page_list, nr, make_dirty);
+			nr = 0;
+		}
 	}
 
+	if (nr)
+		unpin_user_pages_dirty_lock(page_list, nr, make_dirty);
+
+	if (page_list)
+		free_page((unsigned long) page_list);
 	sg_free_table(&umem->sg_head);
 }
 
@@ -212,8 +232,7 @@ struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
 		cond_resched();
 		ret = pin_user_pages_fast(cur_base,
 					  min_t(unsigned long, npages,
-						PAGE_SIZE /
-						sizeof(struct page *)),
+						PAGES_PER_LIST),
 					  gup_flags | FOLL_LONGTERM, page_list);
 		if (ret < 0)
 			goto umem_release;
-- 
2.17.1



  parent reply	other threads:[~2020-12-08 17:30 UTC|newest]

Thread overview: 147+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-08 17:28 [PATCH RFC 0/9] mm, sparse-vmemmap: Introduce compound pagemaps Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 1/9] memremap: add ZONE_DEVICE support for compound pages Joao Martins
2020-12-08 17:28   ` Joao Martins
2020-12-09  5:59   ` John Hubbard
2020-12-09  5:59     ` John Hubbard
2020-12-09  6:33     ` Matthew Wilcox
2020-12-09  6:33       ` Matthew Wilcox
2020-12-09 13:12       ` Joao Martins
2020-12-09 13:12         ` Joao Martins
2021-02-20  1:43     ` Dan Williams
2021-02-20  1:43       ` Dan Williams
2021-02-22 11:24       ` Joao Martins
2021-02-22 11:24         ` Joao Martins
2021-02-22 20:37         ` Dan Williams
2021-02-22 20:37           ` Dan Williams
2021-02-23 15:46           ` Joao Martins
2021-02-23 15:46             ` Joao Martins
2021-02-23 16:50             ` Dan Williams
2021-02-23 16:50               ` Dan Williams
2021-02-23 17:18               ` Joao Martins
2021-02-23 17:18                 ` Joao Martins
2021-02-23 18:18                 ` Dan Williams
2021-02-23 18:18                   ` Dan Williams
2021-03-10 18:12           ` Joao Martins
2021-03-10 18:12             ` Joao Martins
2021-03-12  5:54             ` Dan Williams
2021-03-12  5:54               ` Dan Williams
2021-02-20  1:24   ` Dan Williams
2021-02-20  1:24     ` Dan Williams
2021-02-22 11:09     ` Joao Martins
2021-02-22 11:09       ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 2/9] sparse-vmemmap: Consolidate arguments in vmemmap section populate Joao Martins
2020-12-08 17:28   ` Joao Martins
2020-12-09  6:16   ` John Hubbard
2020-12-09  6:16     ` John Hubbard
2020-12-09 13:51     ` Joao Martins
2020-12-09 13:51       ` Joao Martins
2021-02-20  1:49   ` Dan Williams
2021-02-20  1:49     ` Dan Williams
2021-02-22 11:26     ` Joao Martins
2021-02-22 11:26       ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 3/9] sparse-vmemmap: Reuse vmemmap areas for a given mhp_params::align Joao Martins
2020-12-08 17:28   ` Joao Martins
2020-12-08 17:38   ` Joao Martins
2020-12-08 17:38     ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 3/9] sparse-vmemmap: Reuse vmemmap areas for a given page size Joao Martins
2020-12-08 17:28   ` Joao Martins
2021-02-20  3:34   ` Dan Williams
2021-02-20  3:34     ` Dan Williams
2021-02-22 11:42     ` Joao Martins
2021-02-22 11:42       ` Joao Martins
2021-02-22 22:40       ` Dan Williams
2021-02-22 22:40         ` Dan Williams
2021-02-23 15:46         ` Joao Martins
2021-02-23 15:46           ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 4/9] mm/page_alloc: Reuse tail struct pages for compound pagemaps Joao Martins
2020-12-08 17:28   ` Joao Martins
2021-02-20  6:17   ` Dan Williams
2021-02-20  6:17     ` Dan Williams
2021-02-22 12:01     ` Joao Martins
2021-02-22 12:01       ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 5/9] device-dax: Compound pagemap support Joao Martins
2020-12-08 17:28   ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 6/9] mm/gup: Grab head page refcount once for group of subpages Joao Martins
2020-12-08 17:28   ` Joao Martins
2020-12-08 19:49   ` Jason Gunthorpe
2020-12-09 11:05     ` Joao Martins
2020-12-09 11:05       ` Joao Martins
2020-12-09 15:15       ` Jason Gunthorpe
2020-12-09 16:02         ` Joao Martins
2020-12-09 16:02           ` Joao Martins
2020-12-09 16:24           ` Jason Gunthorpe
2020-12-09 17:27             ` Joao Martins
2020-12-09 17:27               ` Joao Martins
2020-12-09 18:14             ` Matthew Wilcox
2020-12-09 18:14               ` Matthew Wilcox
2020-12-09 19:08               ` Jason Gunthorpe
2020-12-10 15:43               ` Joao Martins
2020-12-10 15:43                 ` Joao Martins
2020-12-09  4:40   ` John Hubbard
2020-12-09  4:40     ` John Hubbard
2020-12-09 13:44     ` Joao Martins
2020-12-09 13:44       ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 7/9] mm/gup: Decrement head page " Joao Martins
2020-12-08 17:28   ` Joao Martins
2020-12-08 19:34   ` Jason Gunthorpe
2020-12-09  5:06     ` John Hubbard
2020-12-09  5:06       ` John Hubbard
2020-12-09 13:43       ` Jason Gunthorpe
2020-12-09 12:17     ` Joao Martins
2020-12-09 12:17       ` Joao Martins
2020-12-17 19:05     ` Joao Martins
2020-12-17 19:05       ` Joao Martins
2020-12-17 20:05       ` Jason Gunthorpe
2020-12-17 22:34         ` Joao Martins
2020-12-17 22:34           ` Joao Martins
2020-12-18 14:25           ` Jason Gunthorpe
2020-12-19  2:06         ` John Hubbard
2020-12-19  2:06           ` John Hubbard
2020-12-19 13:10           ` Joao Martins
2020-12-19 13:10             ` Joao Martins
2020-12-08 17:29 ` Joao Martins [this message]
2020-12-08 17:29   ` [PATCH RFC 8/9] RDMA/umem: batch page unpin in __ib_mem_release() Joao Martins
2020-12-08 19:29   ` Jason Gunthorpe
2020-12-09 10:59     ` Joao Martins
2020-12-09 10:59       ` Joao Martins
2020-12-19 13:15       ` Joao Martins
2020-12-19 13:15         ` Joao Martins
2020-12-09  5:18   ` John Hubbard
2020-12-09  5:18     ` John Hubbard
2020-12-08 17:29 ` [PATCH RFC 9/9] mm: Add follow_devmap_page() for devdax vmas Joao Martins
2020-12-08 17:29   ` Joao Martins
2020-12-08 19:57   ` Jason Gunthorpe
2020-12-09  8:05     ` Christoph Hellwig
2020-12-09  8:05       ` Christoph Hellwig
2020-12-09 11:19     ` Joao Martins
2020-12-09 11:19       ` Joao Martins
2020-12-09  5:23   ` John Hubbard
2020-12-09  5:23     ` John Hubbard
2020-12-09  9:38 ` [PATCH RFC 0/9] mm, sparse-vmemmap: Introduce compound pagemaps David Hildenbrand
2020-12-09  9:38   ` David Hildenbrand
2020-12-09  9:52 ` [External] " Muchun Song
2020-12-09  9:52   ` Muchun Song
2021-02-20  1:18 ` Dan Williams
2021-02-20  1:18   ` Dan Williams
2021-02-22 11:06   ` Joao Martins
2021-02-22 11:06     ` Joao Martins
2021-02-22 14:32     ` Joao Martins
2021-02-22 14:32       ` Joao Martins
2021-02-23 16:28   ` Joao Martins
2021-02-23 16:28     ` Joao Martins
2021-02-23 16:44     ` Dan Williams
2021-02-23 16:44       ` Dan Williams
2021-02-23 17:15       ` Joao Martins
2021-02-23 17:15         ` Joao Martins
2021-02-23 18:15         ` Dan Williams
2021-02-23 18:15           ` Dan Williams
2021-02-23 18:54       ` Jason Gunthorpe
2021-02-23 22:48         ` Dan Williams
2021-02-23 22:48           ` Dan Williams
2021-02-23 23:07           ` Jason Gunthorpe
2021-02-24  0:14             ` Dan Williams
2021-02-24  0:14               ` Dan Williams
2021-02-24  1:00               ` Jason Gunthorpe
2021-02-24  1:32                 ` Dan Williams
2021-02-24  1:32                   ` Dan Williams

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