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| author | Joao Martins <joao.m.martins@oracle.com> | 2021-04-30 08:55:53 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-30 21:20:37 +0300 |
| commit | 1d4b0166e36334c3f32686a336bb25dd904fce2b (patch) | |
| tree | 84b6fb8f6b815e2661b099bbcf3091cbc43d35c9 /drivers | |
| parent | 458a4f788f8602e5701b3d8c2fb6b021310a7301 (diff) | |
| download | linux-1d4b0166e36334c3f32686a336bb25dd904fce2b.tar.xz | |
RDMA/umem: batch page unpin in __ib_umem_release()
Use the newly added unpin_user_page_range_dirty_lock() for more quickly
unpinning a consecutive range of pages represented as compound pages.
This will also calculate number of pages to unpin (for the tail pages
which matching head page) and thus batch the refcount update.
Running a test program which calls memory range reg/unreg on a region 1G
in size and measures cost of both operations together (in a guest using
rxe) with THP and hugetlbfs:
Before:
590 rounds in 5.003 sec: 8480.335 usec / round
6898 rounds in 60.001 sec: 8698.367 usec / round
After:
2688 rounds in 5.002 sec: 1860.786 usec / round
32517 rounds in 60.001 sec: 1845.225 usec / round
Link: https://lkml.kernel.org/r/20210212130843.13865-5-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Acked-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Doug Ledford <dledford@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/core/umem.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index 2dde99a9ba07..9b607013e2a2 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -47,17 +47,17 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty) { - struct sg_page_iter sg_iter; - struct page *page; + bool make_dirty = umem->writable && dirty; + struct scatterlist *sg; + unsigned int i; 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); - } + for_each_sg(umem->sg_head.sgl, sg, umem->sg_nents, i) + unpin_user_page_range_dirty_lock(sg_page(sg), + DIV_ROUND_UP(sg->length, PAGE_SIZE), make_dirty); sg_free_table(&umem->sg_head); } |