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authorJeff Dike <jdike@addtoit.com>2006-03-31 02:30:08 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:18:50 -0800
commit02dea0875b0f9b331a65fd6097dfd6115ca4ef24 (patch)
tree100126d72e889296a5d8d8714dd681ab041710cb /arch/mips/lasat
parent85b6bce3658a823aa169586fe71ffba0f12ccc71 (diff)
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[PATCH] UML: Hotplug memory, take 2
Changes since first version added check for MADV_REMOVE support on the host fixed error return botch shrunk sprintf array by one character This adds hotplug memory support to UML. The mconsole syntax is config mem=[+-]n[KMG] In other words, add or subtract some number of kilobytes, megabytes, or gigabytes. Unplugged pages are allocated and then madvise(MADV_TRUNCATE), which is a currently experimental madvise extension. These pages are tracked so they can be plugged back in later if the admin decides to give them back. The first page to be unplugged is used to keep track of about 4M of other pages. A list_head is the first thing on this page. The rest is filled with addresses of other unplugged pages. This first page is not madvised, obviously. When this page is filled, the next page is used in a similar way and linked onto a list with the first page. Etc. This whole process reverses when pages are plugged back in. When a tracking page no longer tracks any unplugged pages, then it is next in line for plugging, which is done by freeing pages back to the kernel. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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