1. 09 Sep, 2005 2 commits
    • Dipankar Sarma's avatar
      [PATCH] files: files struct with RCU · ab2af1f5
      Dipankar Sarma authored
      
      
      Patch to eliminate struct files_struct.file_lock spinlock on the reader side
      and use rcu refcounting rcuref_xxx api for the f_count refcounter.  The
      updates to the fdtable are done by allocating a new fdtable structure and
      setting files->fdt to point to the new structure.  The fdtable structure is
      protected by RCU thereby allowing lock-free lookup.  For fd arrays/sets that
      are vmalloced, we use keventd to free them since RCU callbacks can't sleep.  A
      global list of fdtable to be freed is not scalable, so we use a per-cpu list.
      If keventd is already handling the current cpu's work, we use a timer to defer
      queueing of that work.
      
      Since the last publication, this patch has been re-written to avoid using
      explicit memory barriers and use rcu_assign_pointer(), rcu_dereference()
      premitives instead.  This required that the fd information is kept in a
      separate structure (fdtable) and updated atomically.
      Signed-off-by: default avatarDipankar Sarma <dipankar@in.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      ab2af1f5
    • Dipankar Sarma's avatar
      [PATCH] files: break up files struct · badf1662
      Dipankar Sarma authored
      
      
      In order for the RCU to work, the file table array, sets and their sizes must
      be updated atomically.  Instead of ensuring this through too many memory
      barriers, we put the arrays and their sizes in a separate structure.  This
      patch takes the first step of putting the file table elements in a separate
      structure fdtable that is embedded withing files_struct.  It also changes all
      the users to refer to the file table using files_fdtable() macro.  Subsequent
      applciation of RCU becomes easier after this.
      Signed-off-by: default avatarDipankar Sarma <dipankar@in.ibm.com>
      Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      badf1662
  2. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4