1. 18 1月, 2017 7 次提交
  2. 12 1月, 2017 1 次提交
    • J
      xfs: Timely free truncated dirty pages · 0a417b8d
      Jan Kara 提交于
      Commit 99579cce "xfs: skip dirty pages in ->releasepage()" started
      to skip dirty pages in xfs_vm_releasepage() which also has the effect
      that if a dirty page is truncated, it does not get freed by
      block_invalidatepage() and is lingering in LRU list waiting for reclaim.
      So a simple loop like:
      
      while true; do
      	dd if=/dev/zero of=file bs=1M count=100
      	rm file
      done
      
      will keep using more and more memory until we hit low watermarks and
      start pagecache reclaim which will eventually reclaim also the truncate
      pages. Keeping these truncated (and thus never usable) pages in memory
      is just a waste of memory, is unnecessarily stressing page cache
      reclaim, and reportedly also leads to anonymous mmap(2) returning ENOMEM
      prematurely.
      
      So instead of just skipping dirty pages in xfs_vm_releasepage(), return
      to old behavior of skipping them only if they have delalloc or unwritten
      buffers and fix the spurious warnings by warning only if the page is
      clean.
      
      CC: stable@vger.kernel.org
      CC: Brian Foster <bfoster@redhat.com>
      CC: Vlastimil Babka <vbabka@suse.cz>
      Reported-by: NPetr Tůma <petr.tuma@d3s.mff.cuni.cz>
      Fixes: 99579cceSigned-off-by: NJan Kara <jack@suse.cz>
      Reviewed-by: NBrian Foster <bfoster@redhat.com>
      Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
      0a417b8d
  3. 10 1月, 2017 5 次提交
  4. 04 1月, 2017 4 次提交
  5. 25 12月, 2016 1 次提交
  6. 23 12月, 2016 1 次提交
  7. 10 12月, 2016 2 次提交
    • D
      vfs: refactor clone/dedupe_file_range common functions · 876bec6f
      Darrick J. Wong 提交于
      Hoist both the XFS reflink inode state and preparation code and the XFS
      file blocks compare functions into the VFS so that ocfs2 can take
      advantage of it for reflink and dedupe.
      Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
      876bec6f
    • C
      fs: try to clone files first in vfs_copy_file_range · a76b5b04
      Christoph Hellwig 提交于
      A clone is a perfectly fine implementation of a file copy, so most
      file systems just implement the copy that way.  Instead of duplicating
      this logic move it to the VFS.  Currently btrfs and XFS implement copies
      the same way as clones and there is no behavior change for them, cifs
      only implements clones and grow support for copy_file_range with this
      patch.  NFS implements both, so this will allow copy_file_range to work
      on servers that only implement CLONE and be lot more efficient on servers
      that implements CLONE and COPY.
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      a76b5b04
  8. 09 12月, 2016 8 次提交
  9. 07 12月, 2016 1 次提交
    • L
      xfs: use rhashtable to track buffer cache · 6031e73a
      Lucas Stach 提交于
      On filesystems with a lot of metadata and in metadata intensive workloads
      xfs_buf_find() is showing up at the top of the CPU cycles trace. Most of
      the CPU time is spent on CPU cache misses while traversing the rbtree.
      
      As the buffer cache does not need any kind of ordering, but fast lookups
      a hashtable is the natural data structure to use. The rhashtable
      infrastructure provides a self-scaling hashtable implementation and
      allows lookups to proceed while the table is going through a resize
      operation.
      
      This reduces the CPU-time spent for the lookups to 1/3 even for small
      filesystems with a relatively small number of cached buffers, with
      possibly much larger gains on higher loaded filesystems.
      
      [dchinner: reduce minimum hash size to an acceptable size for large
      	   filesystems with many AGs with no active use.]
      [dchinner: remove stale rbtree asserts.]
      [dchinner: use xfs_buf_map for compare function argument.]
      [dchinner: make functions static.]
      [dchinner: remove redundant comments.]
      Signed-off-by: NLucas Stach <dev@lynxeye.de>
      Signed-off-by: NDave Chinner <dchinner@redhat.com>
      Reviewed-by: NChristoph Hellwig <hch@lst.de>
      Signed-off-by: NDave Chinner <david@fromorbit.com>
      
      6031e73a
  10. 05 12月, 2016 10 次提交
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