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| author | Jan Beulich <JBeulich@novell.com> | 2009-09-22 02:03:03 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 16:17:38 +0200 |
| commit | 4738e1b9cf8f9e28d7de080a5e6ce5d0095ea18f (patch) | |
| tree | 96804aacfd79495dbb787055473f92ccb6dab65d /mm/memory_hotplug.c | |
| parent | page-allocator: limit the number of MIGRATE_RESERVE pageblocks per zone (diff) | |
| download | linux-4738e1b9cf8f9e28d7de080a5e6ce5d0095ea18f.tar.xz linux-4738e1b9cf8f9e28d7de080a5e6ce5d0095ea18f.zip | |
memory hotplug: fix updating of num_physpages for hot plugged memory
Sizing of memory allocations shouldn't depend on the number of physical
pages found in a system, as that generally includes (perhaps a huge amount
of) non-RAM pages. The amount of what actually is usable as storage
should instead be used as a basis here.
In line with that, the memory hotplug code should update num_physpages in
a way that it retains its original (post-boot) meaning; in particular,
decreasing the value should at best be done with great care - this patch
doesn't try to ever decrease this value at all as it doesn't really seem
meaningful to do so.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 616236e6343f..efe3e0ec2e61 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -339,8 +339,11 @@ EXPORT_SYMBOL_GPL(__remove_pages); void online_page(struct page *page) { + unsigned long pfn = page_to_pfn(page); + totalram_pages++; - num_physpages++; + if (pfn >= num_physpages) + num_physpages = pfn + 1; #ifdef CONFIG_HIGHMEM if (PageHighMem(page)) @@ -832,7 +835,6 @@ repeat: zone->present_pages -= offlined_pages; zone->zone_pgdat->node_present_pages -= offlined_pages; totalram_pages -= offlined_pages; - num_physpages -= offlined_pages; setup_per_zone_wmarks(); calculate_zone_inactive_ratio(zone); |