1. 12 3月, 2006 34 次提交
  2. 11 3月, 2006 4 次提交
  3. 10 3月, 2006 2 次提交
    • C
      [PATCH] slab: Node rotor for freeing alien caches and remote per cpu pages. · 8fce4d8e
      Christoph Lameter 提交于
      The cache reaper currently tries to free all alien caches and all remote
      per cpu pages in each pass of cache_reap.  For a machines with large number
      of nodes (such as Altix) this may lead to sporadic delays of around ~10ms.
      Interrupts are disabled while reclaiming creating unacceptable delays.
      
      This patch changes that behavior by adding a per cpu reap_node variable.
      Instead of attempting to free all caches, we free only one alien cache and
      the per cpu pages from one remote node.  That reduces the time spend in
      cache_reap.  However, doing so will lengthen the time it takes to
      completely drain all remote per cpu pagesets and all alien caches.  The
      time needed will grow with the number of nodes in the system.  All caches
      are drained when they overflow their respective capacity.  So the drawback
      here is only that a bit of memory may be wasted for awhile longer.
      
      Details:
      
      1. Rename drain_remote_pages to drain_node_pages to allow the specification
         of the node to drain of pcp pages.
      
      2. Add additional functions init_reap_node, next_reap_node for NUMA
         that manage a per cpu reap_node counter.
      
      3. Add a reap_alien function that reaps only from the current reap_node.
      
      For us this seems to be a critical issue.  Holdoffs of an average of ~7ms
      cause some HPC benchmarks to slow down significantly.  F.e.  NAS parallel
      slows down dramatically.  NAS parallel has a 12-16 seconds runtime w/o rotor
      compared to 5.8 secs with the rotor patches.  It gets down to 5.05 secs with
      the additional interrupt holdoff reductions.
      Signed-off-by: NChristoph Lameter <clameter@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      8fce4d8e
    • R
      [PATCH] m68k: fix cmpxchg compile errors if CONFIG_RMW_INSNS=n · 7b61fcda
      Roman Zippel 提交于
      We require that all archs implement atomic_cmpxchg(), for the generic
      version of atomic_add_unless().
      Signed-off-by: NRoman Zippel <zippel@linux-m68k.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Adrian Bunk <bunk@stusta.de>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      7b61fcda