linux.git/mm/bootmem.c, branch v4.4

bootmem: avoid freeing to bootmem after bootmem is done

2015-09-08T22:35:28+00:00

Bootmem isn't popular any more, but some architectures still use it, and
freeing to bootmem after calling free_all_bootmem_core() can end up
scribbling over random memory.  Instead, make sure the kernel generates
a warning in this case by ensuring the node_bootmem_map field is
non-NULL when are freeing or marking bootmem.

An instance of this bug was just fixed in the tile architecture ("tile:
use free_bootmem_late() for initrd") and catching this case more widely
seems like a good thing.

Signed-off-by: Chris Metcalf 
Acked-by: Mel Gorman 
Cc: Yasuaki Ishimatsu 
Cc: Pekka Enberg 
Cc: Paul McQuade 
Cc: Tang Chen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: page_alloc: pass PFN to __free_pages_bootmem

2015-07-01T02:44:55+00:00

__free_pages_bootmem prepares a page for release to the buddy allocator
and assumes that the struct page is initialised.  Parallel initialisation
of struct pages defers initialisation and __free_pages_bootmem can be
called for struct pages that cannot yet map struct page to PFN.  This
patch passes PFN to __free_pages_bootmem with no other functional change.

Signed-off-by: Mel Gorman 
Tested-by: Nate Zimmer 
Tested-by: Waiman Long 
Tested-by: Daniel J Blueman 
Acked-by: Pekka Enberg 
Cc: Robin Holt 
Cc: Nate Zimmer 
Cc: Dave Hansen 
Cc: Waiman Long 
Cc: Scott Norton 
Cc: "Luck, Tony" 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mem-hotplug: reset node managed pages when hot-adding a new pgdat

2014-11-14T00:17:06+00:00

In free_area_init_core(), zone->managed_pages is set to an approximate
value for lowmem, and will be adjusted when the bootmem allocator frees
pages into the buddy system.

But free_area_init_core() is also called by hotadd_new_pgdat() when
hot-adding memory.  As a result, zone->managed_pages of the newly added
node's pgdat is set to an approximate value in the very beginning.

Even if the memory on that node has node been onlined,
/sys/device/system/node/nodeXXX/meminfo has wrong value:

  hot-add node2 (memory not onlined)
  cat /sys/device/system/node/node2/meminfo
  Node 2 MemTotal:       33554432 kB
  Node 2 MemFree:               0 kB
  Node 2 MemUsed:        33554432 kB
  Node 2 Active:                0 kB

This patch fixes this problem by reset node managed pages to 0 after
hot-adding a new node.

1. Move reset_managed_pages_done from reset_node_managed_pages() to
   reset_all_zones_managed_pages()
2. Make reset_node_managed_pages() non-static
3. Call reset_node_managed_pages() in hotadd_new_pgdat() after pgdat
   is initialized

Signed-off-by: Tang Chen 
Signed-off-by: Yasuaki Ishimatsu 
Cc: 	[3.16+]
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/bootmem.c: use include/linux/ headers

2014-10-10T02:26:00+00:00

Replace asm. headers with linux/headers:




Signed-off-by: Paul McQuade 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/bootmem.c: remove unused local `map'

2013-11-13T03:09:09+00:00

Signed-off-by: Daeseok Youn 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: use pgdat_end_pfn() to simplify the code in others

2013-11-13T03:09:03+00:00

Use "pgdat_end_pfn()" instead of "pgdat->node_start_pfn +
pgdat->node_spanned_pages".  Simplify the code, no functional change.

Signed-off-by: Xishi Qiu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: kill free_all_bootmem_node()

2013-07-03T23:07:39+00:00

Now nobody makes use of free_all_bootmem_node(), kill it.

Signed-off-by: Jiang Liu 
Cc: Johannes Weiner 
Cc: "David S. Miller" 
Cc: Yinghai Lu 
Acked-by: Tejun Heo 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: concentrate modification of totalram_pages into the mm core

2013-07-03T23:07:33+00:00

Concentrate code to modify totalram_pages into the mm core, so the arch
memory initialized code doesn't need to take care of it.  With these
changes applied, only following functions from mm core modify global
variable totalram_pages: free_bootmem_late(), free_all_bootmem(),
free_all_bootmem_node(), adjust_managed_page_count().

With this patch applied, it will be much more easier for us to keep
totalram_pages and zone->managed_pages in consistence.

Signed-off-by: Jiang Liu 
Acked-by: David Howells 
Cc: "H. Peter Anvin" 
Cc: "Michael S. Tsirkin" 
Cc: 
Cc: Arnd Bergmann 
Cc: Catalin Marinas 
Cc: Chris Metcalf 
Cc: Geert Uytterhoeven 
Cc: Ingo Molnar 
Cc: Jeremy Fitzhardinge 
Cc: Jianguo Wu 
Cc: Joonsoo Kim 
Cc: Kamezawa Hiroyuki 
Cc: Konrad Rzeszutek Wilk 
Cc: Marek Szyprowski 
Cc: Mel Gorman 
Cc: Michel Lespinasse 
Cc: Minchan Kim 
Cc: Rik van Riel 
Cc: Rusty Russell 
Cc: Tang Chen 
Cc: Tejun Heo 
Cc: Thomas Gleixner 
Cc: Wen Congyang 
Cc: Will Deacon 
Cc: Yasuaki Ishimatsu 
Cc: Yinghai Lu 
Cc: Russell King 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: accurately calculate zone->managed_pages for highmem zones

2013-07-03T23:07:33+00:00

Commit "mm: introduce new field 'managed_pages' to struct zone" assumes
that all highmem pages will be freed into the buddy system by function
mem_init().  But that's not always true, some architectures may reserve
some highmem pages during boot.  For example PPC may allocate highmem
pages for giagant HugeTLB pages, and several architectures have code to
check PageReserved flag to exclude highmem pages allocated during boot
when freeing highmem pages into the buddy system.

So treat highmem pages in the same way as normal pages, that is to:
1) reset zone->managed_pages to zero in mem_init().
2) recalculate managed_pages when freeing pages into the buddy system.

Signed-off-by: Jiang Liu 
Cc: "H. Peter Anvin" 
Cc: Tejun Heo 
Cc: Joonsoo Kim 
Cc: Yinghai Lu 
Cc: Mel Gorman 
Cc: Minchan Kim 
Cc: Kamezawa Hiroyuki 
Cc: Marek Szyprowski 
Cc: "Michael S. Tsirkin" 
Cc: 
Cc: Arnd Bergmann 
Cc: Catalin Marinas 
Cc: Chris Metcalf 
Cc: David Howells 
Cc: Geert Uytterhoeven 
Cc: Ingo Molnar 
Cc: Jeremy Fitzhardinge 
Cc: Jianguo Wu 
Cc: Konrad Rzeszutek Wilk 
Cc: Michel Lespinasse 
Cc: Rik van Riel 
Cc: Rusty Russell 
Cc: Tang Chen 
Cc: Thomas Gleixner 
Cc: Wen Congyang 
Cc: Will Deacon 
Cc: Yasuaki Ishimatsu 
Cc: Russell King 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: Add alloc_bootmem_low_pages_nopanic()

2013-01-30T03:32:59+00:00

We don't need to panic in some case, like for swiotlb preallocating.

Signed-off-by: Yinghai Lu 
Link: http://lkml.kernel.org/r/1359058816-7615-35-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin