1. 22 Mar, 2011 1 commit
  2. 15 Mar, 2011 15 commits
  3. 12 Jan, 2011 1 commit
    • Al Viro's avatar
      switch 9p · 98cd3fb0
      Al Viro authored
      
      
      here we actually *want* ->d_op for root; setting it allows to get rid
      of kludge in v9fs_kill_super() since now we have proper ->d_release()
      for root and don't need to call it manually.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      98cd3fb0
  4. 11 Jan, 2011 2 commits
  5. 06 Jan, 2011 5 commits
    • Nick Piggin's avatar
      fs: dcache per-inode inode alias locking · 873feea0
      Nick Piggin authored
      
      
      dcache_inode_lock can be replaced with per-inode locking. Use existing
      inode->i_lock for this. This is slightly non-trivial because we sometimes
      need to find the inode from the dentry, which requires d_inode to be
      stabilised (either with refcount or d_lock).
      Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
      873feea0
    • Nick Piggin's avatar
      fs: dcache reduce branches in lookup path · fb045adb
      Nick Piggin authored
      
      
      Reduce some branches and memory accesses in dcache lookup by adding dentry
      flags to indicate common d_ops are set, rather than having to check them.
      This saves a pointer memory access (dentry->d_op) in common path lookup
      situations, and saves another pointer load and branch in cases where we
      have d_op but not the particular operation.
      
      Patched with:
      
      git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i
      Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
      fb045adb
    • Nick Piggin's avatar
      fs: icache RCU free inodes · fa0d7e3d
      Nick Piggin authored
      
      
      RCU free the struct inode. This will allow:
      
      - Subsequent store-free path walking patch. The inode must be consulted for
        permissions when walking, so an RCU inode reference is a must.
      - sb_inode_list_lock to be moved inside i_lock because sb list walkers who want
        to take i_lock no longer need to take sb_inode_list_lock to walk the list in
        the first place. This will simplify and optimize locking.
      - Could remove some nested trylock loops in dcache code
      - Could potentially simplify things a bit in VM land. Do not need to take the
        page lock to follow page->mapping.
      
      The downsides of this is the performance cost of using RCU. In a simple
      creat/unlink microbenchmark, performance drops by about 10% due to inability to
      reuse cache-hot slab objects. As iterations increase and RCU freeing starts
      kicking over, this increases to about 20%.
      
      In cases where inode lifetimes are longer (ie. many inodes may be allocated
      during the average life span of a single inode), a lot of this cache reuse is
      not applicable, so the regression caused by this patch is smaller.
      
      The cache-hot regression could largely be avoided by using SLAB_DESTROY_BY_RCU,
      however this adds some complexity to list walking and store-free path walking,
      so I prefer to implement this at a later date, if it is shown to be a win in
      real situations. I haven't found a regression in any non-micro benchmark so I
      doubt it will be a problem.
      Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
      fa0d7e3d
    • Nick Piggin's avatar
      fs: dcache remove dcache_lock · b5c84bf6
      Nick Piggin authored
      
      
      dcache_lock no longer protects anything. remove it.
      Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
      b5c84bf6
    • Nick Piggin's avatar
      fs: scale inode alias list · b23fb0a6
      Nick Piggin authored
      
      
      Add a new lock, dcache_inode_lock, to protect the inode's i_dentry list
      from concurrent modification. d_alias is also protected by d_lock.
      Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
      b23fb0a6
  6. 28 Oct, 2010 10 commits
  7. 25 Oct, 2010 1 commit
  8. 13 Sep, 2010 3 commits
  9. 10 Aug, 2010 1 commit
  10. 09 Aug, 2010 1 commit