linux-toradex.git/drivers/base/node.c, branch v2.6.34-rc1

sysdev: Use sysdev_class attribute arrays in node driver

2010-03-08T01:04:47+00:00

Convert the node driver to sysdev_class attribute arrays. This
greatly cleans up the code and remove a lot of code.

Saves ~150 bytes of code on x86-64.

Signed-off-by: Andi Kleen 
Signed-off-by: Greg Kroah-Hartman

sysdev: Convert node driver class attributes to be data driven

2010-03-08T01:04:47+00:00

Using the new attribute argument convert the node driver class
attributes to carry the node state. Then use a shared function to do
what a lot of individual functions did before.

Signed-off-by: Andi Kleen 
Signed-off-by: Greg Kroah-Hartman

sysdev: Pass attribute in sysdev_class attributes show/store

2010-03-08T01:04:47+00:00

Passing the attribute to the low level IO functions allows all kinds
of cleanups, by sharing low level IO code without requiring
an own function for every piece of data.

Also drivers can extend the attributes with own data fields
and use that in the low level function.

Similar to sysdev_attributes and normal attributes.

This is a tree-wide sweep, converting everything in one go.

No functional changes in this patch other than passing the new
argument everywhere.

Tested on x86, the non x86 parts are uncompiled.

Signed-off-by: Andi Kleen 
Signed-off-by: Greg Kroah-Hartman

mm: slab-allocate memory section nodemask for large systems

2009-12-15T16:53:20+00:00

Nodemasks should not be allocated on the stack for large systems (when it
is larger than 256 bytes) since there is a threat of overflow.

This patch causes the unregister_mem_sect_under_nodes() nodemask to be
allocated on the stack for smaller systems and be allocated by slab for
larger systems.

GFP_KERNEL is used since remove_memory_block() can block.

Cc: Gary Hade 
Cc: Badari Pulavarty 
Cc: Alex Chiang 
Signed-off-by: David Rientjes 
Cc: Greg Kroah-Hartman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: add numa node symlink for cpu devices in sysfs

2009-12-15T16:53:18+00:00

You can discover which CPUs belong to a NUMA node by examining
/sys/devices/system/node/node#/

However, it's not convenient to go in the other direction, when looking at
/sys/devices/system/cpu/cpu#/

Yes, you can muck about in sysfs, but adding these symlinks makes life a
lot more convenient.

Signed-off-by: Alex Chiang 
Acked-by: David Rientjes 
Cc: Gary Hade 
Cc: Badari Pulavarty 
Cc: Ingo Molnar 
Cc: David Rientjes 
Cc: Greg KH 
Cc: Randy Dunlap 
Cc: David Rientjes 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: refactor unregister_cpu_under_node()

2009-12-15T16:53:17+00:00

By returning early if the node is not online, we can unindent the
interesting code by two levels.

No functional change.

Signed-off-by: Alex Chiang 
Cc: Gary Hade 
Cc: Badari Pulavarty 
Cc: Ingo Molnar 
Cc: David Rientjes 
Cc: Greg KH 
Cc: Randy Dunlap 
Cc: David Rientjes 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: refactor register_cpu_under_node()

2009-12-15T16:53:17+00:00

By returning early if the node is not online, we can unindent the
interesting code by one level.

No functional change.

Signed-off-by: Alex Chiang 
Cc: Gary Hade 
Cc: Badari Pulavarty 
Cc: Ingo Molnar 
Cc: David Rientjes 
Cc: Greg KH 
Cc: Randy Dunlap 
Cc: David Rientjes 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: add numa node symlink for memory section in sysfs

2009-12-15T16:53:17+00:00

Commit c04fc586c (mm: show node to memory section relationship with
symlinks in sysfs) created symlinks from nodes to memory sections, e.g.

/sys/devices/system/node/node1/memory135 -> ../../memory/memory135

If you're examining the memory section though and are wondering what node
it might belong to, you can find it by grovelling around in sysfs, but
it's a little cumbersome.

Add a reverse symlink for each memory section that points back to the
node to which it belongs.

Signed-off-by: Alex Chiang 
Cc: Gary Hade 
Cc: Badari Pulavarty 
Cc: Ingo Molnar 
Acked-by: David Rientjes 
Cc: Greg KH 
Cc: Randy Dunlap 
Cc: David Rientjes 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

hugetlb: offload per node attribute registrations

2009-12-15T16:53:13+00:00

Offload the registration and unregistration of per node hstate sysfs
attributes to a worker thread rather than attempt the
allocation/attachment or detachment/freeing of the attributes in the
context of the memory hotplug handler.

I don't know that this is absolutely required, but the registration can
sleep in allocations and other mem hot plug handlers do it this way.  If
it turns out this is NOT required, we can drop this patch.

N.B.,  Only tested build, boot, libhugetlbfs regression.
       i.e., no memory hotplug testing.

Signed-off-by: Lee Schermerhorn 
Reviewed-by: Andi Kleen 
Cc: KAMEZAWA Hiroyuki 
Cc: Lee Schermerhorn 
Cc: Mel Gorman 
Cc: Randy Dunlap 
Cc: Nishanth Aravamudan 
Cc: David Rientjes 
Cc: Adam Litke 
Cc: Andy Whitcroft 
Cc: Eric Whitney 
Cc: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

hugetlb: handle memory hot-plug events

2009-12-15T16:53:13+00:00

Register per node hstate attributes only for nodes with memory.  As
suggested by David Rientjes.

With Memory Hotplug, memory can be added to a memoryless node and a node
with memory can become memoryless.  Therefore, add a memory on/off-line
notifier callback to [un]register a node's attributes on transition
to/from memoryless state.

N.B.,  Only tested build, boot, libhugetlbfs regression.
       i.e., no memory hotplug testing.

Signed-off-by: Lee Schermerhorn 
Reviewed-by: Andi Kleen 
Acked-by: David Rientjes 
Cc: KAMEZAWA Hiroyuki 
Cc: Lee Schermerhorn 
Cc: Mel Gorman 
Cc: Randy Dunlap 
Cc: Nishanth Aravamudan 
Cc: Adam Litke 
Cc: Andy Whitcroft 
Cc: Eric Whitney 
Cc: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds