linux-toradex.git/kernel/cpuset.c, branch v2.6.26-rc1

Cpuset hardwall flag: add a mem_hardwall flag to cpusets

2008-04-29T15:06:11+00:00

This flag provides the hardwalling properties of mem_exclusive, without
enforcing the exclusivity.  Either mem_hardwall or mem_exclusive is sufficient
to prevent GFP_KERNEL allocations from passing outside the cpuset's assigned
nodes.

Signed-off-by: Paul Menage 
Acked-by: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Cpuset hardwall flag: switch cpusets to use the bulk cgroup_add_files() API

2008-04-29T15:06:11+00:00

Currently the cpusets mem_exclusive flag is overloaded to mean both
"no-overlapping" and "no GFP_KERNEL allocations outside this cpuset".

These patches add a new mem_hardwall flag with just the allocation restriction
part of the mem_exclusive semantics, without breaking backwards-compatibility
for those who continue to use just mem_exclusive.  Additionally, the cgroup
control file registration for cpusets is cleaned up to reduce boilerplate.

This patch:

This change tidies up the cpusets control file definitions, and reduces the
amount of boilerplate required to add/change control files in the future.

Signed-off-by: Paul Menage 
Reviewed-by: Li Zefan 
Acked-by: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kernel/cpuset.c: make 3 functions static

2008-04-29T15:06:11+00:00

Make the following needlessly global functions static:

- cpuset_test_cpumask()
- cpuset_change_cpumask()
- cpuset_do_move_task()

Signed-off-by: Adrian Bunk 
Acked-by: Paul Jackson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

CGroup API files: update cpusets to use cgroup structured file API

2008-04-29T15:06:08+00:00

Many of the cpusets control files are simple integer values, which don't
require the overhead of memory allocations for reads and writes.

Move the handlers for these control files into cpuset_read_u64() and
cpuset_write_u64().

[akpm@linux-foundation.org: ad dmissing `break']
Signed-off-by: Paul Menage 
Cc: "Li Zefan" 
Cc: Balbir Singh 
Cc: Paul Jackson 
Cc: Pavel Emelyanov 
Cc: KAMEZAWA Hiroyuki 
Cc: "YAMAMOTO Takashi" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kernel: fix integer as NULL pointer warnings

2008-04-29T00:29:18+00:00

kernel/cpuset.c:1268:52: warning: Using plain integer as NULL pointer
kernel/pid_namespace.c:95:24: warning: Using plain integer as NULL pointer

Signed-off-by: Harvey Harrison 
Reviewed-by: Paul Jackson 
Signed-off-by: Linus Torvalds

mempolicy: rename mpol_copy to mpol_dup

2008-04-28T15:58:23+00:00

This patch renames mpol_copy() to mpol_dup() because, well, that's what it
does.  Like, e.g., strdup() for strings, mpol_dup() takes a pointer to an
existing mempolicy, allocates a new one and copies the contents.

In a later patch, I want to use the name mpol_copy() to copy the contents from
one mempolicy to another like, e.g., strcpy() does for strings.

Signed-off-by: Lee Schermerhorn 
Cc: Christoph Lameter 
Cc: David Rientjes 
Cc: Mel Gorman 
Cc: Andi Kleen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: filter based on a nodemask as well as a gfp_mask

2008-04-28T15:58:19+00:00

The MPOL_BIND policy creates a zonelist that is used for allocations
controlled by that mempolicy.  As the per-node zonelist is already being
filtered based on a zone id, this patch adds a version of __alloc_pages() that
takes a nodemask for further filtering.  This eliminates the need for
MPOL_BIND to create a custom zonelist.

A positive benefit of this is that allocations using MPOL_BIND now use the
local node's distance-ordered zonelist instead of a custom node-id-ordered
zonelist.  I.e., pages will be allocated from the closest allowed node with
available memory.

[Lee.Schermerhorn@hp.com: Mempolicy: update stale documentation and comments]
[Lee.Schermerhorn@hp.com: Mempolicy: make dequeue_huge_page_vma() obey MPOL_BIND nodemask]
[Lee.Schermerhorn@hp.com: Mempolicy: make dequeue_huge_page_vma() obey MPOL_BIND nodemask rework]
Signed-off-by: Mel Gorman 
Acked-by: Christoph Lameter 
Signed-off-by: Lee Schermerhorn 
Cc: KAMEZAWA Hiroyuki 
Cc: Mel Gorman 
Cc: Hugh Dickins 
Cc: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: have zonelist contains structs with both a zone pointer and zone_idx

2008-04-28T15:58:18+00:00

Filtering zonelists requires very frequent use of zone_idx().  This is costly
as it involves a lookup of another structure and a substraction operation.  As
the zone_idx is often required, it should be quickly accessible.  The node idx
could also be stored here if it was found that accessing zone->node is
significant which may be the case on workloads where nodemasks are heavily
used.

This patch introduces a struct zoneref to store a zone pointer and a zone
index.  The zonelist then consists of an array of these struct zonerefs which
are looked up as necessary.  Helpers are given for accessing the zone index as
well as the node index.

[kamezawa.hiroyu@jp.fujitsu.com: Suggested struct zoneref instead of embedding information in pointers]
[hugh@veritas.com: mm-have-zonelist: fix memcg ooms]
[hugh@veritas.com: just return do_try_to_free_pages]
[hugh@veritas.com: do_try_to_free_pages gfp_mask redundant]
Signed-off-by: Mel Gorman 
Acked-by: Christoph Lameter 
Acked-by: David Rientjes 
Signed-off-by: Lee Schermerhorn 
Cc: KAMEZAWA Hiroyuki 
Cc: Mel Gorman 
Cc: Christoph Lameter 
Cc: Nick Piggin 
Signed-off-by: Hugh Dickins 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sched, cpuset: customize sched domains, core

2008-04-19T17:45:00+00:00

[rebased for sched-devel/latest]

 - Add a new cpuset file, having levels:
     sched_relax_domain_level

 - Modify partition_sched_domains() and build_sched_domains()
   to take attributes parameter passed from cpuset.

 - Fill newidle_idx for node domains which currently unused but
   might be required if sched_relax_domain_level become higher.

 - We can change the default level by boot option 'relax_domain_level='.

Signed-off-by: Hidetoshi Seto 
Signed-off-by: Ingo Molnar

cpumask: use new cpus_scnprintf function

2008-04-19T17:44:59+00:00

  * Cleaned up references to cpumask_scnprintf() and added new
    cpulist_scnprintf() interfaces where appropriate.

  * Fix some small bugs (or code efficiency improvments) for various uses
    of cpumask_scnprintf.

  * Clean up some checkpatch errors.

Signed-off-by: Mike Travis 
Signed-off-by: Ingo Molnar