[RFC PATCH 4/4]: affinity-on-next-touch

[Stefan Lankes]

[Patch 4/4]: This part of the patch adds some counters to detect migration
errors and publishes these counters via /proc/vmstat. Besides this, the
Kconfig file is extend with the parameter CONFIG_AFFINITY_ON_NEXT_TOUCH.


include/linux/vmstat.h |    6 ++++++
mm/Kconfig             |    9 +++++++++
mm/vmstat.c            |    6 ++++++
3 files changed, 21 insertions(+), 0 deletions(-)


diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 524cd1b..64c8e66 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -51,6 +51,12 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
                UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
                UNEVICTABLE_MLOCKFREED,
 #endif
+#ifdef CONFIG_AFFINITY_ON_NEXT_TOUCH
+               AONT_INVALID_NODEMASK,
+               AONT_ISOLATE_BUSY,
+               AONT_ISOLATE_FAILED,
+               AONT_MIGRATION_FAILED,
+#endif
                NR_VM_EVENT_ITEMS
 };
 
diff --git a/mm/Kconfig b/mm/Kconfig
index c2b57d8..025c328 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -181,6 +181,15 @@ config MIGRATION
          example on NUMA systems to put pages nearer to the processors
accessing
          the page.
 
+config AFFINITY_ON_NEXT_TOUCH
+       bool "Affinity on next touch (EXPERIMENTAL)" if (EXPERIMENTAL)
+       def_bool y
+       depends on MIGRATION
+       help
+         Allows the migration of pages to the node, which has the next
access 
+         to the pages. This realized a page placement strategy, which is
called 
+         "affinity-on-next-touch".
+
 config PHYS_ADDR_T_64BIT
        def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
 
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 66f6130..d0e9489 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -708,6 +708,12 @@ static const char * const vmstat_text[] = {
        "unevictable_pgs_stranded",
        "unevictable_pgs_mlockfreed",
 #endif
+#ifdef CONFIG_AFFINITY_ON_NEXT_TOUCH
+       "aont_invalid_nodemask",
+       "aont_isolate_busy",
+       "aont_isolate_failed",
+       "aont_migration_failed",
+#endif
 #endif
 };

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