linux-stable.git/mm/sparse.c, branch linux-2.6.27.y

mm/sparse.c: removed duplicated include

2008-08-12T23:07:30+00:00

Signed-off-by: Huang Weiyi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

make mm/sparse.c: make a function static

2008-07-26T19:00:12+00:00

This patch makes the needlessly global sparse_early_mem_map_alloc()
static.

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory hotplug: allocate usemap on the section with pgdat

2008-07-24T17:47:21+00:00

Usemaps are allocated on the section which has pgdat by this.

Because usemap size is very small, many other sections usemaps are
allocated on only one page.  If a section has usemap, it can't be removed
until removing other sections.  This dependency is not desirable for
memory removing.

Pgdat has similar feature.  When a section has pgdat area, it must be the
last section for removing on the node.  So, if section A has pgdat and
section B has usemap for section A, Both sections can't be removed due to
dependency each other.

To solve this issue, this patch collects usemap on same section with pgdat
as much as possible.  If other sections doesn't have any dependency, this
section will be able to be removed finally.

Signed-off-by: Yasunori Goto 
Cc: Mel Gorman 
Cc: Andy Whitcroft 
Cc: David Miller 
Cc: Badari Pulavarty 
Cc: Heiko Carstens 
Cc: Hiroyuki KAMEZAWA 
Cc: Tony Breeds 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: make defensive checks around PFN values registered for memory usage

2008-07-24T17:47:13+00:00

There are a number of different views to how much memory is currently active.
There is the arch-independent zone-sizing view, the bootmem allocator and
memory models view.

Architectures register this information at different times and is not
necessarily in sync particularly with respect to some SPARSEMEM limitations.

This patch introduces mminit_validate_memmodel_limits() which is able to
validate and correct PFN ranges with respect to the memory model.  It is only
SPARSEMEM that currently validates itself.

Signed-off-by: Mel Gorman 
Cc: Christoph Lameter 
Cc: Andy Whitcroft 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

revert "memory hotplug: allocate usemap on the section with pgdat"

2008-04-30T15:29:55+00:00

This:

commit 86f6dae1377523689bd8468fed2f2dd180fc0560
Author: Yasunori Goto 
Date:   Mon Apr 28 02:13:33 2008 -0700

    memory hotplug: allocate usemap on the section with pgdat

    Usemaps are allocated on the section which has pgdat by this.

    Because usemap size is very small, many other sections usemaps are allocated
    on only one page.  If a section has usemap, it can't be removed until removing
    other sections.  This dependency is not desirable for memory removing.

    Pgdat has similar feature.  When a section has pgdat area, it must be the last
    section for removing on the node.  So, if section A has pgdat and section B
    has usemap for section A, Both sections can't be removed due to dependency
    each other.

    To solve this issue, this patch collects usemap on same section with pgdat.
    If other sections doesn't have any dependency, this section will be able to be
    removed finally.

    Signed-off-by: Yasunori Goto 
    Cc: Badari Pulavarty 
    Cc: Yinghai Lu 
    Cc: Yasunori Goto 
    Signed-off-by: Andrew Morton 
    Signed-off-by: Linus Torvalds 

broke davem's sparc64 bootup.  Revert it while we work out what went wrong.

Cc: Yasunori Goto 
Cc: Badari Pulavarty 
Cc: Yinghai Lu 
Cc: "David S. Miller" 
Cc: Heiko Carstens 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: remove remaining FUNCTION occurrences

2008-04-30T15:29:53+00:00

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory hotplug: free memmaps allocated by bootmem

2008-04-28T15:58:26+00:00

This patch is to free memmaps which is allocated by bootmem.

Freeing usemap is not necessary.  The pages of usemap may be necessary for
other sections.

If removing section is last section on the node, its section is the final user
of usemap page.  (usemaps are allocated on its section by previous patch.) But
it shouldn't be freed too, because the section must be logical offline state
which all pages are isolated against page allocater.  If it is freed, page
alloctor may use it which will be removed physically soon.  It will be
disaster.  So, this patch keeps it as it is.

Signed-off-by: Yasunori Goto 
Cc: Badari Pulavarty 
Cc: Yinghai Lu 
Cc: Yasunori Goto 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory hotplug: allocate usemap on the section with pgdat

2008-04-28T15:58:25+00:00

Usemaps are allocated on the section which has pgdat by this.

Because usemap size is very small, many other sections usemaps are allocated
on only one page.  If a section has usemap, it can't be removed until removing
other sections.  This dependency is not desirable for memory removing.

Pgdat has similar feature.  When a section has pgdat area, it must be the last
section for removing on the node.  So, if section A has pgdat and section B
has usemap for section A, Both sections can't be removed due to dependency
each other.

To solve this issue, this patch collects usemap on same section with pgdat.
If other sections doesn't have any dependency, this section will be able to be
removed finally.

Signed-off-by: Yasunori Goto 
Cc: Badari Pulavarty 
Cc: Yinghai Lu 
Cc: Yasunori Goto 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory hotplug: align memmap to page size

2008-04-28T15:58:25+00:00

To free memmap easier, this patch aligns it to page size.  Bootmem allocater
may mix some objects in one pages.  It's not good for freeing memmap of memory
hot-remove.

Signed-off-by: Yasunori Goto 
Cc: Badari Pulavarty 
Cc: Yinghai Lu 
Cc: Yasunori Goto 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memory hotplug: register section/node id to free

2008-04-28T15:58:25+00:00

This patch set is to free pages which is allocated by bootmem for
memory-hotremove.  Some structures of memory management are allocated by
bootmem.  ex) memmap, etc.

To remove memory physically, some of them must be freed according to
circumstance.  This patch set makes basis to free those pages, and free
memmaps.

Basic my idea is using remain members of struct page to remember information
of users of bootmem (section number or node id).  When the section is
removing, kernel can confirm it.  By this information, some issues can be
solved.

  1) When the memmap of removing section is allocated on other
     section by bootmem, it should/can be free.
  2) When the memmap of removing section is allocated on the
     same section, it shouldn't be freed. Because the section has to be
     logical memory offlined already and all pages must be isolated against
     page allocater. If it is freed, page allocator may use it which will
     be removed physically soon.
  3) When removing section has other section's memmap,
     kernel will be able to show easily which section should be removed
     before it for user. (Not implemented yet)
  4) When the above case 2), the page isolation will be able to check and skip
     memmap's page when logical memory offline (offline_pages()).
     Current page isolation code fails in this case because this page is
     just reserved page and it can't distinguish this pages can be
     removed or not. But, it will be able to do by this patch.
     (Not implemented yet.)
  5) The node information like pgdat has similar issues. But, this
     will be able to be solved too by this.
     (Not implemented yet, but, remembering node id in the pages.)

Fortunately, current bootmem allocator just keeps PageReserved flags,
and doesn't use any other members of page struct. The users of
bootmem doesn't use them too.

This patch:

This is to register information which is node or section's id.  Kernel can
distinguish which node/section uses the pages allcated by bootmem.  This is
basis for hot-remove sections or nodes.

Signed-off-by: Yasunori Goto 
Cc: Badari Pulavarty 
Cc: Yinghai Lu 
Cc: Yasunori Goto 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

linux-stable.git/mm/sparse.c, branch linux-2.6.27.y

mm/sparse.c: removed duplicated include

make mm/sparse.c: make a function static

memory hotplug: allocate usemap on the section with pgdat

mm: make defensive checks around PFN values registered for memory usage

revert "memory hotplug: allocate usemap on the section with pgdat"

mm: remove remaining __FUNCTION__ occurrences

memory hotplug: free memmaps allocated by bootmem

memory hotplug: allocate usemap on the section with pgdat

memory hotplug: align memmap to page size

memory hotplug: register section/node id to free

mm: remove remaining FUNCTION occurrences