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authorDaniel Kiper <dkiper@net-space.pl>2011-07-26 04:12:05 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 07:57:08 +0400
commit9d0ad8ca43ce8023bb834a409c2258bd7197fb05 (patch)
tree551120ae34bee2ee8a8e596ffc004e4ad36f5731 /include/xen
parentef22f6a70c9186c8e25f757b0e8f7374b37f69bf (diff)
downloadlinux-9d0ad8ca43ce8023bb834a409c2258bd7197fb05.tar.xz
mm: extend memory hotplug API to allow memory hotplug in virtual machines
This patch contains online_page_callback and apropriate functions for registering/unregistering online page callbacks. It allows to do some machine specific tasks during online page stage which is required to implement memory hotplug in virtual machines. Currently this patch is required by latest memory hotplug support for Xen balloon driver patch which will be posted soon. Additionally, originial online_page() function was splited into following functions doing "atomic" operations: - __online_page_set_limits() - set new limits for memory management code, - __online_page_increment_counters() - increment totalram_pages and totalhigh_pages, - __online_page_free() - free page to allocator. It was done to: - not duplicate existing code, - ease hotplug code devolpment by usage of well defined interface, - avoid stupid bugs which are unavoidable when the same code (by design) is developed in many places. [akpm@linux-foundation.org: use explicit indirect-call syntax] Signed-off-by: Daniel Kiper <dkiper@net-space.pl> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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