linux-toradex.git/mm, branch v2.6.21-rc1

[PATCH] slab: reduce size of alien cache to cover only possible nodes

2007-02-21T01:10:13+00:00

The alien cache is a per cpu per node array allocated for every slab on the
system.  Currently we size this array for all nodes that the kernel does
support.  For IA64 this is 1024 nodes.  So we allocate an array with 1024
objects even if we only boot a system with 4 nodes.

This patch uses "nr_node_ids" to determine the number of possible nodes
supported by a hardware configuration and only allocates an alien cache
sized for possible nodes.

The initialization of nr_node_ids occurred too late relative to the bootstrap
of the slab allocator and so I moved the setup_nr_node_ids() into
free_area_init_nodes().

Signed-off-by: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Replace highest_possible_node_id() with nr_node_ids

2007-02-21T01:10:13+00:00

highest_possible_node_id() is currently used to calculate the last possible
node idso that the network subsystem can figure out how to size per node
arrays.

I think having the ability to determine the maximum amount of nodes in a
system at runtime is useful but then we should name this entry
correspondingly, it should return the number of node_ids, and the the value
needs to be setup only once on bootup.  The node_possible_map does not
change after bootup.

This patch introduces nr_node_ids and replaces the use of
highest_possible_node_id().  nr_node_ids is calculated on bootup when the
page allocators pagesets are initialized.

[deweerdt@free.fr: fix oops]
Signed-off-by: Christoph Lameter 
Cc: Neil Brown 
Cc: Trond Myklebust 
Signed-off-by: Frederik Deweerdt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] fix mempolicy's check on a system with memory-less-node

2007-02-21T01:10:13+00:00

bind_zonelist() can create zero-length zonelist if there is a
memory-less-node.  This patch checks the length of zonelist.  If length is
0, returns -EINVAL.

tested on ia64/NUMA with memory-less-node.

Signed-off-by: KAMEZAWA Hiroyuki 
Acked-by: Andi Kleen 
Cc: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] knfsd: stop NFSD writes from being broken into lots of little writes to filesystem

2007-02-16T16:14:01+00:00

When NFSD receives a write request, the data is typically in a number of
1448 byte segments and writev is used to collect them together.

Unfortunately, generic_file_buffered_write passes these to the filesystem
one at a time, so an e.g.  32K over-write becomes a series of partial-page
writes to each page, causing the filesystem to have to pre-read those pages
- wasted effort.

generic_file_buffered_write handles one segment of the vector at a time as
it has to pre-fault in each segment to avoid deadlocks.  When writing from
kernel-space (and nfsd does) this is not an issue, so
generic_file_buffered_write does not need to break and iovec from nfsd into
little pieces.

This patch avoids the splitting when  get_fs is KERNEL_DS as it is
from NFSd.

This issue was introduced by commit 6527c2bdf1f833cc18e8f42bd97973d583e4aa83

Acked-by: Nick Piggin 
Cc: Norman Weathers 
Cc: Vladimir V. Saveliev 
Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mincore: vma crossing fix

2007-02-15T17:57:03+00:00

My mincore also forgot about crossing vmas.

Signed-off-by: Nick Piggin 
Signed-off-by: Linus Torvalds

[PATCH] mincore: fill in results properly

2007-02-15T17:57:03+00:00

Paper bag time. Thanks to Randy for noticing that I didn't actually assign
'present' to anything.

Unfortunately my original patch passed the few simple test cases I gave it,
purely by coincidence.

Signed-off-by: Nick Piggin 
Signed-off-by: Linus Torvalds

[PATCH] mincore: CONFIG_SWAP=n fix

2007-02-15T17:57:03+00:00

Fix mincore-anon patch to compile with CONFIG_SWAP=n

Signed-off-by: Nick Piggin 
Signed-off-by: Linus Torvalds

[PATCH] mark struct inode_operations const 2

2007-02-12T17:48:46+00:00

Many struct inode_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: mincore anon

2007-02-12T17:48:27+00:00

Make mincore work for anon mappings, nonlinear, and migration entries.
Based on patch from Linus Torvalds .

Signed-off-by: Nick Piggin 
Acked-by: Hugh Dickins 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Add NOPFN_REFAULT result from vm_ops->nopfn()

2007-02-12T17:48:27+00:00

Add a NOPFN_REFAULT return code for vm_ops->nopfn() equivalent to
NOPAGE_REFAULT for vmops->nopage() indicating that the handler requests a
re-execution of the faulting instruction

Signed-off-by: Benjamin Herrenschmidt 
Cc: Arnd Bergmann 
Cc: Hugh Dickins 
Cc: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds