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From: Dan Williams <dan.j.williams@intel.com>
To: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org, axboe@kernel.dk, riel@redhat.com,
	linux-nvdimm@ml01.01.org,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-raid@vger.kernel.org, mgorman@suse.de, hch@infradead.org,
	linux-fsdevel@vger.kernel.org,
	Matthew Wilcox <willy@linux.intel.com>
Subject: [RFC PATCH 0/7] evacuate struct page from the block layer
Date: Mon, 16 Mar 2015 16:25:25 -0400	[thread overview]
Message-ID: <20150316201640.33102.33761.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)

Avoid the impending disaster of requiring struct page coverage for what
is expected to be ever increasing capacities of persistent memory.  In
conversations with Rik van Riel, Mel Gorman, and Jens Axboe at the
recently concluded Linux Storage Summit it became clear that struct page
is not required in many places, it was simply convenient to re-use.

Introduce helpers and infrastructure to remove struct page usage where
it is not necessary.  One use case for these changes is to implement a
write-back-cache in persistent memory for software-RAID.  Another use
case for the scatterlist changes is RDMA to a pfn-range.

This compiles and boots, but 0day-kbuild-robot coverage is needed before
this set exits "RFC".  Obviously, the coccinelle script needs to be
re-run on the block updates for kernel.next.  As is, this only includes
the resulting auto-generated-patch against 4.0-rc3.

---

Dan Williams (6):
      block: add helpers for accessing a bio_vec page
      block: convert bio_vec.bv_page to bv_pfn
      dma-mapping: allow archs to optionally specify a ->map_pfn() operation
      scatterlist: use sg_phys()
      x86: support dma_map_pfn()
      block: base support for pfn i/o

Matthew Wilcox (1):
      scatterlist: support "page-less" (__pfn_t only) entries


 arch/Kconfig                                 |    3 +
 arch/arm/mm/dma-mapping.c                    |    2 -
 arch/microblaze/kernel/dma.c                 |    2 -
 arch/powerpc/sysdev/axonram.c                |    2 -
 arch/x86/Kconfig                             |   12 +++
 arch/x86/kernel/amd_gart_64.c                |   22 ++++--
 arch/x86/kernel/pci-nommu.c                  |   22 ++++--
 arch/x86/kernel/pci-swiotlb.c                |    4 +
 arch/x86/pci/sta2x11-fixup.c                 |    4 +
 arch/x86/xen/pci-swiotlb-xen.c               |    4 +
 block/bio-integrity.c                        |    8 +-
 block/bio.c                                  |   83 +++++++++++++++------
 block/blk-core.c                             |    9 ++
 block/blk-integrity.c                        |    7 +-
 block/blk-lib.c                              |    2 -
 block/blk-merge.c                            |   15 ++--
 block/bounce.c                               |   26 +++----
 drivers/block/aoe/aoecmd.c                   |    8 +-
 drivers/block/brd.c                          |    2 -
 drivers/block/drbd/drbd_bitmap.c             |    5 +
 drivers/block/drbd/drbd_main.c               |    4 +
 drivers/block/drbd/drbd_receiver.c           |    4 +
 drivers/block/drbd/drbd_worker.c             |    3 +
 drivers/block/floppy.c                       |    6 +-
 drivers/block/loop.c                         |    8 +-
 drivers/block/nbd.c                          |    8 +-
 drivers/block/nvme-core.c                    |    2 -
 drivers/block/pktcdvd.c                      |   11 ++-
 drivers/block/ps3disk.c                      |    2 -
 drivers/block/ps3vram.c                      |    2 -
 drivers/block/rbd.c                          |    2 -
 drivers/block/rsxx/dma.c                     |    3 +
 drivers/block/umem.c                         |    2 -
 drivers/block/zram/zram_drv.c                |   10 +--
 drivers/dma/ste_dma40.c                      |    5 -
 drivers/iommu/amd_iommu.c                    |   21 ++++-
 drivers/iommu/intel-iommu.c                  |   26 +++++--
 drivers/iommu/iommu.c                        |    2 -
 drivers/md/bcache/btree.c                    |    4 +
 drivers/md/bcache/debug.c                    |    6 +-
 drivers/md/bcache/movinggc.c                 |    2 -
 drivers/md/bcache/request.c                  |    6 +-
 drivers/md/bcache/super.c                    |   10 +--
 drivers/md/bcache/util.c                     |    5 +
 drivers/md/bcache/writeback.c                |    2 -
 drivers/md/dm-crypt.c                        |   12 ++-
 drivers/md/dm-io.c                           |    2 -
 drivers/md/dm-verity.c                       |    2 -
 drivers/md/raid1.c                           |   50 +++++++------
 drivers/md/raid10.c                          |   38 +++++-----
 drivers/md/raid5.c                           |    6 +-
 drivers/mmc/card/queue.c                     |    4 +
 drivers/s390/block/dasd_diag.c               |    2 -
 drivers/s390/block/dasd_eckd.c               |   14 ++--
 drivers/s390/block/dasd_fba.c                |    6 +-
 drivers/s390/block/dcssblk.c                 |    2 -
 drivers/s390/block/scm_blk.c                 |    2 -
 drivers/s390/block/scm_blk_cluster.c         |    2 -
 drivers/s390/block/xpram.c                   |    2 -
 drivers/scsi/mpt2sas/mpt2sas_transport.c     |    6 +-
 drivers/scsi/mpt3sas/mpt3sas_transport.c     |    6 +-
 drivers/scsi/sd_dif.c                        |    4 +
 drivers/staging/android/ion/ion_chunk_heap.c |    4 +
 drivers/staging/lustre/lustre/llite/lloop.c  |    2 -
 drivers/xen/biomerge.c                       |    4 +
 drivers/xen/swiotlb-xen.c                    |   29 +++++--
 fs/btrfs/check-integrity.c                   |    6 +-
 fs/btrfs/compression.c                       |   12 ++-
 fs/btrfs/disk-io.c                           |    4 +
 fs/btrfs/extent_io.c                         |    8 +-
 fs/btrfs/file-item.c                         |    8 +-
 fs/btrfs/inode.c                             |   18 +++--
 fs/btrfs/raid56.c                            |    4 +
 fs/btrfs/volumes.c                           |    2 -
 fs/buffer.c                                  |    4 +
 fs/direct-io.c                               |    2 -
 fs/exofs/ore.c                               |    4 +
 fs/exofs/ore_raid.c                          |    2 -
 fs/ext4/page-io.c                            |    2 -
 fs/f2fs/data.c                               |    4 +
 fs/f2fs/segment.c                            |    2 -
 fs/gfs2/lops.c                               |    4 +
 fs/jfs/jfs_logmgr.c                          |    4 +
 fs/logfs/dev_bdev.c                          |   10 +--
 fs/mpage.c                                   |    2 -
 fs/splice.c                                  |    2 -
 include/asm-generic/dma-mapping-common.h     |   30 ++++++++
 include/asm-generic/memory_model.h           |    4 +
 include/asm-generic/scatterlist.h            |    6 ++
 include/crypto/scatterwalk.h                 |   10 +++
 include/linux/bio.h                          |   24 +++---
 include/linux/blk_types.h                    |   21 +++++
 include/linux/blkdev.h                       |    2 +
 include/linux/dma-debug.h                    |   23 +++++-
 include/linux/dma-mapping.h                  |    8 ++
 include/linux/scatterlist.h                  |  101 ++++++++++++++++++++++++--
 include/linux/swiotlb.h                      |    5 +
 kernel/power/block_io.c                      |    2 -
 lib/dma-debug.c                              |    4 +
 lib/swiotlb.c                                |   20 ++++-
 mm/iov_iter.c                                |   22 +++---
 mm/page_io.c                                 |    8 +-
 net/ceph/messenger.c                         |    2 -
 103 files changed, 658 insertions(+), 335 deletions(-)

             reply	other threads:[~2015-03-16 20:28 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-16 20:25 Dan Williams [this message]
2015-03-16 20:25 ` [RFC PATCH 1/7] block: add helpers for accessing a bio_vec page Dan Williams
2015-03-16 20:25 ` [RFC PATCH 2/7] block: convert bio_vec.bv_page to bv_pfn Dan Williams
2015-03-16 23:05   ` Al Viro
2015-03-17 13:02     ` Matthew Wilcox
2015-03-17 15:53       ` Dan Williams
2015-03-16 20:25 ` [RFC PATCH 3/7] dma-mapping: allow archs to optionally specify a ->map_pfn() operation Dan Williams
2015-03-18 11:21   ` [Linux-nvdimm] " Boaz Harrosh
2015-03-16 20:25 ` [RFC PATCH 4/7] scatterlist: use sg_phys() Dan Williams
2015-03-16 20:25 ` [RFC PATCH 5/7] scatterlist: support "page-less" (__pfn_t only) entries Dan Williams
2015-03-16 20:25 ` [RFC PATCH 6/7] x86: support dma_map_pfn() Dan Williams
2015-03-16 20:26 ` [RFC PATCH 7/7] block: base support for pfn i/o Dan Williams
2015-03-18 10:47 ` [RFC PATCH 0/7] evacuate struct page from the block layer Boaz Harrosh
2015-03-18 13:06   ` Matthew Wilcox
2015-03-18 14:38     ` [Linux-nvdimm] " Boaz Harrosh
2015-03-20 15:56       ` Rik van Riel
2015-03-22 11:53         ` Boaz Harrosh
2015-03-18 15:35   ` Dan Williams
2015-03-18 20:26 ` Andrew Morton
2015-03-19 13:43   ` Matthew Wilcox
2015-03-19 15:54     ` [Linux-nvdimm] " Boaz Harrosh
2015-03-19 19:59       ` Andrew Morton
2015-03-19 20:59         ` Dan Williams
2015-03-22 17:22           ` Boaz Harrosh
2015-03-20 17:32         ` Wols Lists
2015-03-22 10:30         ` Boaz Harrosh
2015-03-19 18:17     ` Christoph Hellwig
2015-03-19 19:31       ` Matthew Wilcox
2015-03-22 16:46       ` Boaz Harrosh
2015-03-20 16:21     ` Rik van Riel
2015-03-20 20:31       ` Matthew Wilcox
2015-03-20 21:08         ` Rik van Riel
2015-03-22 17:06           ` Boaz Harrosh
2015-03-22 17:22             ` Dan Williams
2015-03-22 17:39               ` Boaz Harrosh
2015-03-20 21:17         ` Wols Lists
2015-03-22 16:24         ` Boaz Harrosh
2015-03-22 15:51       ` Boaz Harrosh
2015-03-23 15:19         ` Rik van Riel
2015-03-23 19:30           ` Christoph Hellwig
2015-03-24  9:41           ` Boaz Harrosh
2015-03-24 16:57             ` Rik van Riel

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