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author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2012-12-11 16:03:16 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-11 17:22:28 -0800 |
commit | 511c2aba8f07fc45bdcba548cb63f7b8a450c6dc (patch) | |
tree | 6a1a853e60e0004f5895d78231ed1bea33fecaac /drivers/base | |
parent | fcf07d22f089856631b52a75c35ba3c33b70a1b4 (diff) | |
download | linux-3.10-511c2aba8f07fc45bdcba548cb63f7b8a450c6dc.tar.gz linux-3.10-511c2aba8f07fc45bdcba548cb63f7b8a450c6dc.tar.bz2 linux-3.10-511c2aba8f07fc45bdcba548cb63f7b8a450c6dc.zip |
mm, memory-hotplug: dynamic configure movable memory and portion memory
Add online_movable and online_kernel for logic memory hotplug. This is
the dynamic version of "movablecore" & "kernelcore".
We have the same reason to introduce it as to introduce "movablecore" &
"kernelcore". It has the same motive as "movablecore" & "kernelcore", but
it is dynamic/running-time:
o We can configure memory as kernelcore or movablecore after boot.
Userspace workload is increased, we need more hugepage, we can't use
"online_movable" to add memory and allow the system use more
THP(transparent-huge-page), vice-verse when kernel workload is increase.
Also help for virtualization to dynamic configure host/guest's memory,
to save/(reduce waste) memory.
Memory capacity on Demand
o When a new node is physically online after boot, we need to use
"online_movable" or "online_kernel" to configure/portion it as we
expected when we logic-online it.
This configuration also helps for physically-memory-migrate.
o all benefit as the same as existed "movablecore" & "kernelcore".
o Preparing for movable-node, which is very important for power-saving,
hardware partitioning and high-available-system(hardware fault
management).
(Note, we don't introduce movable-node here.)
Action behavior:
When a memoryblock/memorysection is onlined by "online_movable", the kernel
will not have directly reference to the page of the memoryblock,
thus we can remove that memory any time when needed.
When it is online by "online_kernel", the kernel can use it.
When it is online by "online", the zone type doesn't changed.
Current constraints:
Only the memoryblock which is adjacent to the ZONE_MOVABLE
can be online from ZONE_NORMAL to ZONE_MOVABLE.
[akpm@linux-foundation.org: use min_t, cleanups]
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/memory.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 7eb1211ab68..987604d56c8 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -254,7 +254,7 @@ static bool pages_correctly_reserved(unsigned long start_pfn, * OK to have direct references to sparsemem variables in here. */ static int -memory_block_action(unsigned long phys_index, unsigned long action) +memory_block_action(unsigned long phys_index, unsigned long action, int online_type) { unsigned long start_pfn; unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; @@ -269,7 +269,7 @@ memory_block_action(unsigned long phys_index, unsigned long action) if (!pages_correctly_reserved(start_pfn, nr_pages)) return -EBUSY; - ret = online_pages(start_pfn, nr_pages); + ret = online_pages(start_pfn, nr_pages, online_type); break; case MEM_OFFLINE: ret = offline_pages(start_pfn, nr_pages); @@ -284,7 +284,8 @@ memory_block_action(unsigned long phys_index, unsigned long action) } static int __memory_block_change_state(struct memory_block *mem, - unsigned long to_state, unsigned long from_state_req) + unsigned long to_state, unsigned long from_state_req, + int online_type) { int ret = 0; @@ -296,7 +297,7 @@ static int __memory_block_change_state(struct memory_block *mem, if (to_state == MEM_OFFLINE) mem->state = MEM_GOING_OFFLINE; - ret = memory_block_action(mem->start_section_nr, to_state); + ret = memory_block_action(mem->start_section_nr, to_state, online_type); if (ret) { mem->state = from_state_req; @@ -319,12 +320,14 @@ out: } static int memory_block_change_state(struct memory_block *mem, - unsigned long to_state, unsigned long from_state_req) + unsigned long to_state, unsigned long from_state_req, + int online_type) { int ret; mutex_lock(&mem->state_mutex); - ret = __memory_block_change_state(mem, to_state, from_state_req); + ret = __memory_block_change_state(mem, to_state, from_state_req, + online_type); mutex_unlock(&mem->state_mutex); return ret; @@ -338,10 +341,18 @@ store_mem_state(struct device *dev, mem = container_of(dev, struct memory_block, dev); - if (!strncmp(buf, "online", min((int)count, 6))) - ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); - else if(!strncmp(buf, "offline", min((int)count, 7))) - ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); + if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) + ret = memory_block_change_state(mem, MEM_ONLINE, + MEM_OFFLINE, ONLINE_KERNEL); + else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) + ret = memory_block_change_state(mem, MEM_ONLINE, + MEM_OFFLINE, ONLINE_MOVABLE); + else if (!strncmp(buf, "online", min_t(int, count, 6))) + ret = memory_block_change_state(mem, MEM_ONLINE, + MEM_OFFLINE, ONLINE_KEEP); + else if(!strncmp(buf, "offline", min_t(int, count, 7))) + ret = memory_block_change_state(mem, MEM_OFFLINE, + MEM_ONLINE, -1); if (ret) return ret; @@ -676,7 +687,7 @@ int offline_memory_block(struct memory_block *mem) mutex_lock(&mem->state_mutex); if (mem->state != MEM_OFFLINE) - ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); + ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); mutex_unlock(&mem->state_mutex); return ret; |