linux.git/mm/Makefile, branch v2.6.26

uaccess: add probe_kernel_write()

2008-04-17T18:05:36+00:00

add probe_kernel_read() and probe_kernel_write().

Uninlined and restricted to kernel range memory only, as suggested
by Linus.

Signed-off-by: Ingo Molnar 
Reviewed-by: Thomas Gleixner

Memory controller: rename to Memory Resource Controller

2008-03-05T00:35:12+00:00

Rename Memory Controller to Memory Resource Controller.  Reflect the same
changes in the CONFIG definition for the Memory Resource Controller.  Group
together the config options for Resource Counters and Memory Resource
Controller.

Signed-off-by: Balbir Singh 
Cc: Paul Menage 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Memory controller: cgroups setup

2008-02-07T16:42:18+00:00

Setup the memory cgroup and add basic hooks and controls to integrate
and work with the cgroup.

Signed-off-by: Balbir Singh 
Cc: Pavel Emelianov 
Cc: Paul Menage 
Cc: Peter Zijlstra 
Cc: "Eric W. Biederman" 
Cc: Nick Piggin 
Cc: Kirill Korotaev 
Cc: Herbert Poetzl 
Cc: David Rientjes 
Cc: Vaidyanathan Srinivasan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'dmapool' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc

2008-02-06T03:05:48+00:00

* 'dmapool' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc:
  pool: Improve memory usage for devices which can't cross boundaries
  Change dmapool free block management
  dmapool: Tidy up includes and add comments
  dmapool: Validate parameters to dma_pool_create
  Avoid taking waitqueue lock in dmapool
  dmapool: Fix style problems
  Move dmapool.c to mm/ directory

maps4: make page monitoring /proc file optional

2008-02-05T17:44:17+00:00

Make /proc/ page monitoring configurable

This puts the following files under an embedded config option:

/proc/pid/clear_refs
/proc/pid/smaps
/proc/pid/pagemap
/proc/kpagecount
/proc/kpageflags

[akpm@linux-foundation.org: Kconfig fix]
Signed-off-by: Matt Mackall 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

maps4: introduce a generic page walker

2008-02-05T17:44:16+00:00

Introduce a general page table walker

Signed-off-by: Matt Mackall 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Move dmapool.c to mm/ directory

2007-12-04T15:39:54+00:00

Signed-off-by: Matthew Wilcox

memory unplug: page isolation

2007-10-16T16:43:02+00:00

Implement generic chunk-of-pages isolation method by using page grouping ops.

This patch add MIGRATE_ISOLATE to MIGRATE_TYPES. By this
 - MIGRATE_TYPES increases.
 - bitmap for migratetype is enlarged.

pages of MIGRATE_ISOLATE migratetype will not be allocated even if it is free.
By this, you can isolated *freed* pages from users. How-to-free pages is not
a purpose of this patch. You may use reclaim and migrate codes to free pages.

If start_isolate_page_range(start,end) is called,
 - migratetype of the range turns to be MIGRATE_ISOLATE  if
   its type is MIGRATE_MOVABLE. (*) this check can be updated if other
   memory reclaiming works make progress.
 - MIGRATE_ISOLATE is not on migratetype fallback list.
 - All free pages and will-be-freed pages are isolated.
To check all pages in the range are isolated or not,  use test_pages_isolated(),
To cancel isolation, use undo_isolate_page_range().

Changes V6 -> V7
 - removed unnecessary #ifdef

There are HOLES_IN_ZONE handling codes...I'm glad if we can remove them..

Signed-off-by: Yasunori Goto 
Signed-off-by: KAMEZAWA Hiroyuki 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Generic Virtual Memmap support for SPARSEMEM

2007-10-16T16:42:51+00:00

SPARSEMEM is a pretty nice framework that unifies quite a bit of code over all
the arches.  It would be great if it could be the default so that we can get
rid of various forms of DISCONTIG and other variations on memory maps.  So far
what has hindered this are the additional lookups that SPARSEMEM introduces
for virt_to_page and page_address.  This goes so far that the code to do this
has to be kept in a separate function and cannot be used inline.

This patch introduces a virtual memmap mode for SPARSEMEM, in which the memmap
is mapped into a virtually contigious area, only the active sections are
physically backed.  This allows virt_to_page page_address and cohorts become
simple shift/add operations.  No page flag fields, no table lookups, nothing
involving memory is required.

The two key operations pfn_to_page and page_to_page become:

   #define __pfn_to_page(pfn)      (vmemmap + (pfn))
   #define __page_to_pfn(page)     ((page) - vmemmap)

By having a virtual mapping for the memmap we allow simple access without
wasting physical memory.  As kernel memory is typically already mapped 1:1
this introduces no additional overhead.  The virtual mapping must be big
enough to allow a struct page to be allocated and mapped for all valid
physical pages.  This vill make a virtual memmap difficult to use on 32 bit
platforms that support 36 address bits.

However, if there is enough virtual space available and the arch already maps
its 1-1 kernel space using TLBs (f.e.  true of IA64 and x86_64) then this
technique makes SPARSEMEM lookups even more efficient than CONFIG_FLATMEM.
FLATMEM needs to read the contents of the mem_map variable to get the start of
the memmap and then add the offset to the required entry.  vmemmap is a
constant to which we can simply add the offset.

This patch has the potential to allow us to make SPARSMEM the default (and
even the only) option for most systems.  It should be optimal on UP, SMP and
NUMA on most platforms.  Then we may even be able to remove the other memory
models: FLATMEM, DISCONTIG etc.

[apw@shadowen.org: config cleanups, resplit code etc]
[kamezawa.hiroyu@jp.fujitsu.com: Fix sparsemem_vmemmap init]
[apw@shadowen.org: vmemmap: remove excess debugging]
[apw@shadowen.org: simplify initialisation code and reduce duplication]
[apw@shadowen.org: pull out the vmemmap code into its own file]
Signed-off-by: Christoph Lameter 
Signed-off-by: Andy Whitcroft 
Acked-by: Mel Gorman 
Cc: "Luck, Tony" 
Cc: Andi Kleen 
Cc: "David S. Miller" 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
Cc: KAMEZAWA Hiroyuki 
Signed-off-by: KAMEZAWA Hiroyuki 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

CONFIG_BOUNCE to avoid useless inclusion of bounce buffer logic

2007-07-17T17:23:02+00:00

The bounce buffer logic is included on systems that do not need it.  If a
system does not have zones like ZONE_DMA and ZONE_HIGHMEM that can lead to
the use of bounce buffers then there is no need to reserve memory pools etc
etc.  This is true f.e.  for SGI Altix.

Also nicifies the Makefile and gets rid of the tricky "and" there.

Signed-off-by: Christoph Lameter 
Acked-by: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds