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Badari Pulavarty 5c755e9fd8 memory-hotplug: add sysfs removable attribute for hotplug memory remove ... Memory may be hot-removed on a per-memory-block basis, particularly on POWER where the SPARSEMEM section size often matches the memory-block size. A user-level agent must be able to identify which sections of memory are likely to be removable before attempting the potentially expensive operation. This patch adds a file called "removable" to the memory directory in sysfs to help such an agent. In this patch, a memory block is considered removable if; o It contains only MOVABLE pageblocks o It contains only pageblocks with free pages regardless of pageblock type On the other hand, a memory block starting with a PageReserved() page will never be considered removable. Without this patch, the user-agent is forced to choose a memory block to remove randomly. Sample output of the sysfs files: ./memory/memory0/removable: 0 ./memory/memory1/removable: 0 ./memory/memory2/removable: 0 ./memory/memory3/removable: 0 ./memory/memory4/removable: 0 ./memory/memory5/removable: 0 ./memory/memory6/removable: 0 ./memory/memory7/removable: 1 ./memory/memory8/removable: 0 ./memory/memory9/removable: 0 ./memory/memory10/removable: 0 ./memory/memory11/removable: 0 ./memory/memory12/removable: 0 ./memory/memory13/removable: 0 ./memory/memory14/removable: 0 ./memory/memory15/removable: 0 ./memory/memory16/removable: 0 ./memory/memory17/removable: 1 ./memory/memory18/removable: 1 ./memory/memory19/removable: 1 ./memory/memory20/removable: 1 ./memory/memory21/removable: 1 ./memory/memory22/removable: 1 Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: 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>		17 years ago
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debugfs-pktcdvd	…
procfs-diskstats	Enhanced partition statistics: documentation update	17 years ago
sysfs-block	block: Data integrity infrastructure documentation	17 years ago
sysfs-bus-css	[S390] cio: Introduce modalias for css bus.	17 years ago
sysfs-bus-pci	PCI: Expose PCI VPD through sysfs	17 years ago
sysfs-bus-usb	…
sysfs-class	…
sysfs-class-bdi	fuse: fix bdi naming conflict	17 years ago
sysfs-class-pktcdvd	…
sysfs-dev	sysfs: add /sys/dev/{char,block} to lookup sysfs path by major:minor	17 years ago
sysfs-devices	…
sysfs-devices-memory	memory-hotplug: add sysfs removable attribute for hotplug memory remove	17 years ago
sysfs-firmware-acpi	ACPI: Enhance /sys/firmware/interrupts to allow enable/disable/clear from user-space	17 years ago
sysfs-firmware-memmap	sysfs: add /sys/firmware/memmap	17 years ago
sysfs-ibft	Firmware: add iSCSI iBFT Support	17 years ago
sysfs-kernel-mm	mm: create /sys/kernel/mm	17 years ago
sysfs-kernel-mm-hugepages	hugetlb: new sysfs interface	17 years ago
sysfs-kernel-uids	Documentation: create new scheduler/ subdirectory	17 years ago
sysfs-ocfs2	ocfs2: Document /sys/fs/ocfs2	17 years ago
sysfs-power	…