Hello.
I'll post newest patches for memory hotadd with pgdat allocation as V4.
This includes some of small fixes
- Fix compile errors on config HOTADD /NO HOTADD, NUMA/non NUMA, etc.
- Add/update some comments.
- etc.
This patches are for 2.6.16-rc6-mm1.
I tested these patch on just Tiger4(ia64) with emulation now.
Unfortunately, x86-64 box which I can use has been busy in this week.
So, I couldn't make/test patch for it yet. :-(
But, probably, remain x86-64's issue is just making arch_register_node() to
create sysfs file for new node like 17th patch.
When I can use it again, I'll make and test it.
Andrew-san.
Please apply.
---------------------------------------
This is memory hotadd code when new node is added.
In this patch, pgdat is allocated when new node is comming.
To initialize pgdat and zones, a set of patches are necessary.
- to allcate and initialize pgdat, zone, zonelist.
- to make new kswapd
- to initialize node_data[] array (ia64)
- to register sysfs file for new node.
- to call memory_hotplug code from acpi container driver
which receive ACPI's notification from firmware.
Ia64 big NUMA box needs this feature. I heard that x86-64 needs this too.
Powerpc might use some of this code.
Note:
- kzalloc is used for pgdat allocation in this version.
So, even if pgdat is allocated, it will be allocated on the other node.
This is only to simplify patches a bit. :-P
-----------------------------
Followings are updates.
Updates from V3 to V4.
- update for 2.6.16-rc6-mm1.
- Fix compile errors against Hotadd/NoHotadd, NUMA/NonNUMA, etc.
- Add/update some comments.
- Some functions which can be static become static.
- not call add_memory() for already exist memory at
acpi_memory_enable_device()
Updates from V2 to V3.
- update for 2.6.16-rc5-mm3.
- The caller function of pgdat allcation and so on become common code.
- Passing node id at add_memory().
- build_zonelists() is called after that pages are onlined.
- Updating NODE_DATA() for ia64 become simple and become
common code between booting and hotadd.
(But other consideration will be necessary for hot-remove.)
- kswapd is called by kthread_run().
- finding node id by acpi use handle of its memory device.
Updates from V1 to V2.
- update for 2.6.16-rc5-mm2.
- not only ia64, This is tested on x86_64 with NUMA emulation too. :-)
- wait_table_size() allcation is changed.
- Take max size as much as possible.
- Change using GFP_ATOMIC. It is inside of zone_init_lock.
(Warining message of might_sleep() is very well.)
- stop_machine_run(build_zonelists) is move to outside of lock.
- pgdat_insert() is moved to generic code to be used by x86_64.
- add decision of ZONE_DMA32 or ZONE_NORMAL to x86_64's add_memory().
- Make a separated patch to change from __init to __meminit.
- Fix some typo
--
Yasunori Goto
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