lustre/kernel_patches/patches/kjournald_affinity.patch

   1 --- linux-2.6.10.orig/fs/ext3/super.c   2004-12-24 22:35:28.000000000 +0100
   2 +++ linux-2.6.10/fs/ext3/super.c        2005-01-18 12:27:51.896529310 +0100
   3 @@ -1787,6 +1787,33 @@
   4         return NULL;
   5  }
   6
   7 +#ifdef CONFIG_NUMA
   8 +#include <linux/nodemask.h>
   9 +#include <asm/topology.h>
  10 +
  11 +static int journal_node_affinity = 0;
  12 +spinlock_t journal_node_affinity_lock = SPIN_LOCK_UNLOCKED;
  13 +
  14 +static void ext3_bind_journal_thread(journal_t *journal) {
  15 +       int i, node;
  16 +
  17 +       spin_lock(&journal_node_affinity_lock);
  18 +       for (i = 0; i < MAX_NUMNODES; i++) {
  19 +               node = (journal_node_affinity + i) % MAX_NUMNODES;
  20 +
  21 +               if (!nr_cpus_node(node) || !node_online(node))
  22 +                       continue;
  23 +
  24 +               set_cpus_allowed(journal->j_task, node_to_cpumask(node));
  25 +               journal_node_affinity = (node + 1) % MAX_NUMNODES;
  26 +               break;
  27 +       }
  28 +       spin_unlock(&journal_node_affinity_lock);
  29 +}
  30 +#else
  31 +#define ext3_bind_journal_thread(journal) do {} while (0)
  32 +#endif
  33 +
  34  static int ext3_load_journal(struct super_block * sb,
  35                              struct ext3_super_block * es)
  36  {
  37 @@ -1852,6 +1875,7 @@
  38                 return err;
  39         }
  40
  41 +       ext3_bind_journal_thread(journal);
  42         EXT3_SB(sb)->s_journal = journal;
  43         ext3_clear_journal_err(sb, es);
  44         return 0;
  45 @@ -1881,6 +1908,7 @@
  46                 return -EIO;
  47         }
  48
  49 +       ext3_bind_journal_thread(journal);
  50         EXT3_SB(sb)->s_journal = journal;
  51
  52         ext3_update_dynamic_rev(sb);