linux.git/mm/memory_hotplug.c, branch v3.0-rc4

mm/memory_hotplug.c: fix building of node hotplug zonelist

2011-06-16T03:04:01+00:00

During memory hotplug we refresh zonelists when we online a page in a new
zone.  It means that the node's zonelist is not initialized until pages
are onlined.  So for example, "nid" passed by MEM_GOING_ONLINE notifier
will point to NODE_DATA(nid) which has no zone fallback list.  Moreover,
if we hot-add cpu-only nodes, alloc_pages() will do no fallback.

This patch makes a zonelist when a new pgdata is available.

Note: in production, at fujitsu, memory should be onlined before cpu
      and our server didn't have any memory-less nodes and had no problems.

      But recent changes in MEM_GOING_ONLINE+page_cgroup
      will access not initialized zonelist of node.
      Anyway, there are memory-less node and we need some care.

Signed-off-by: KAMEZAWA Hiroyuki 
Cc: Mel Gorman 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: remove dependency on CONFIG_FLATMEM from online_page()

2011-05-25T15:39:28+00:00

online_pages() is only compiled for CONFIG_MEMORY_HOTPLUG_SPARSE, so there
is no need to support CONFIG_FLATMEM code within it.

This patch removes code that is never used.

Signed-off-by: Daniel Kiper 
Acked-by: Dave Hansen 
Acked-by: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mem-hotplug: call isolate_lru_page with elevated refcount

2011-05-25T15:39:22+00:00

isolate_lru_page() must be called only with stable reference to page.  So,
let's grab normal page reference.

Signed-off-by: Konstantin Khlebnikov 
Cc: Andi Kleen 
Cc: KAMEZAWA Hiroyuki 
Cc: KOSAKI Motohiro 
Cc: Mel Gorman 
Cc: Lee Schermerhorn 
Cc: Rik van Riel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm, mem-hotplug: recalculate lowmem_reserve when memory hotplug occurs

2011-05-25T15:39:09+00:00

Currently, memory hotplug calls setup_per_zone_wmarks() and
calculate_zone_inactive_ratio(), but doesn't call
setup_per_zone_lowmem_reserve().

It means the number of reserved pages aren't updated even if memory hot
plug occur.  This patch fixes it.

Signed-off-by: KOSAKI Motohiro 
Reviewed-by: KAMEZAWA Hiroyuki 
Acked-by: Mel Gorman 
Reviewed-by: Minchan Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm, mem-hotplug: fix section mismatch. setup_per_zone_inactive_ratio() should be __meminit.

2011-05-25T15:39:08+00:00

Commit bce7394a3e ("page-allocator: reset wmark_min and inactive ratio of
zone when hotplug happens") introduced invalid section references.  Now,
setup_per_zone_inactive_ratio() is marked __init and then it can't be
referenced from memory hotplug code.

This patch marks it as __meminit and also marks caller as __ref.

Signed-off-by: KOSAKI Motohiro 
Reviewed-by: Minchan Kim 
Cc: Yasunori Goto 
Cc: Rik van Riel 
Cc: Johannes Weiner 
Reviewed-by: KAMEZAWA Hiroyuki 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: optimize pfn calculation in online_page()

2011-04-14T23:06:54+00:00

If CONFIG_FLATMEM is enabled pfn is calculated in online_page() more than
once.  It is possible to optimize that and use value established at
beginning of that function.

Signed-off-by: Daniel Kiper 
Acked-by: Dave Hansen 
Cc: KAMEZAWA Hiroyuki 
Cc: Wu Fengguang 
Cc: Mel Gorman 
Cc: Christoph Lameter 
Acked-by: David Rientjes 
Reviewed-by: Jesper Juhl 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi

Merge branch 'slub/hotplug' into slab/urgent

2011-01-15T11:28:17+00:00

thp: remove PG_buddy

2011-01-14T01:32:43+00:00

PG_buddy can be converted to _mapcount == -2.  So the PG_compound_lock can
be added to page->flags without overflowing (because of the sparse section
bits increasing) with CONFIG_X86_PAE=y and CONFIG_X86_PAT=y.  This also
has to move the memory hotplug code from _mapcount to lru.next to avoid
any risk of clashes.  We can't use lru.next for PG_buddy removal, but
memory hotplug can use lru.next even more easily than the mapcount
instead.

Signed-off-by: Andrea Arcangeli 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: migration: cleanup migrate_pages API by matching types for offlining and sync

2011-01-14T01:32:34+00:00

With the introduction of the boolean sync parameter, the API looks a
little inconsistent as offlining is still an int.  Convert offlining to a
bool for the sake of being tidy.

Signed-off-by: Mel Gorman 
Cc: Andrea Arcangeli 
Cc: KOSAKI Motohiro 
Cc: Rik van Riel 
Acked-by: Johannes Weiner 
Cc: Andy Whitcroft 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds