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* [PATCH v6 00/17] Rearrange struct page
@ 2018-05-18 19:45 Matthew Wilcox
  2018-05-18 19:45 ` [PATCH v6 01/17] s390: Use _refcount for pgtables Matthew Wilcox
                   ` (16 more replies)
  0 siblings, 17 replies; 32+ messages in thread
From: Matthew Wilcox @ 2018-05-18 19:45 UTC (permalink / raw)
  To: linux-mm
  Cc: Matthew Wilcox, Andrew Morton, Kirill A . Shutemov,
	Christoph Lameter, Lai Jiangshan, Pekka Enberg, Vlastimil Babka,
	Dave Hansen, Jérôme Glisse

From: Matthew Wilcox <mawilcox@microsoft.com>

As presented at LSFMM, this patch-set rearranges struct page to give
more contiguous usable space to users who have allocated a struct page
for their own purposes.  For a graphical view of before-and-after, see
the first two tabs of https://docs.google.com/spreadsheets/d/1tvCszs_7FXrjei9_mtFiKV6nW1FLnYyvPvW-qNZhdog/edit?usp=sharing

Highlights:
 - deferred_list now really exists in struct page instead of just a comment.
 - hmm_data also exists in struct page instead of being a nasty hack.
 - x86's PGD pages have a real pointer to the mm_struct.
 - VMalloc pages now have all sorts of extra information stored in them
   to help with debugging and tuning.
 - rcu_head is no longer tied to slab in case anyone else wants to
   free pages by RCU.
 - slub's counters no longer share space with _refcount.
 - slub's freelist+counters are now naturally dword aligned.
 - slub loses a parameter to a lot of functions and a sysfs file.

Changes in v6:
 - More acks added
 - Incorporated Vlastimil's suggestions to improve the comments

Changes in v5:
 - Added acks from Christoph Lameter
 - Dropped patch to make slub use page->private instead of page->counters.
 - Combined slab/slob/slub into one union in struct page.
 - Added patch to distinguish VMalloc pages.
 - Added patch to remove slub's 'reserved' file in sysfs.
 - Call the unions 'main union' and 'mapcount union' instead of 'first
   union' and 'second union'.
 - Removed a line which described which double-word slub's freelist was in.

Changes in v4:
 - Added acks/reviews from Kirill & Randy
 - Removed call to page_mapcount_reset from slub since it no longer uses
   mapcount union.
 - Add pt_mm and hmm_data to struct page

Matthew Wilcox (17):
  s390: Use _refcount for pgtables
  mm: Split page_type out from _mapcount
  mm: Mark pages in use for page tables
  mm: Switch s_mem and slab_cache in struct page
  mm: Move 'private' union within struct page
  mm: Move _refcount out of struct page union
  mm: Combine first three unions in struct page
  mm: Use page->deferred_list
  mm: Move lru union within struct page
  mm: Combine LRU and main union in struct page
  mm: Improve struct page documentation
  mm: Add pt_mm to struct page
  mm: Add hmm_data to struct page
  slab,slub: Remove rcu_head size checks
  slub: Remove kmem_cache->reserved
  slub: Remove 'reserved' file from sysfs
  mm: Distinguish VMalloc pages

 arch/s390/mm/pgalloc.c                 |  21 ++-
 arch/x86/mm/pgtable.c                  |   5 +-
 fs/proc/page.c                         |   4 +
 include/linux/hmm.h                    |   8 +-
 include/linux/mm.h                     |   2 +
 include/linux/mm_types.h               | 236 ++++++++++++-------------
 include/linux/page-flags.h             |  76 ++++++--
 include/linux/slub_def.h               |   1 -
 include/uapi/linux/kernel-page-flags.h |   3 +-
 kernel/crash_core.c                    |   1 +
 mm/huge_memory.c                       |   7 +-
 mm/page_alloc.c                        |  17 +-
 mm/slab.c                              |   2 -
 mm/slub.c                              | 102 +++--------
 mm/vmalloc.c                           |   5 +-
 scripts/tags.sh                        |   6 +-
 tools/vm/page-types.c                  |   2 +
 17 files changed, 241 insertions(+), 257 deletions(-)

-- 
2.17.0

^ permalink raw reply	[flat|nested] 32+ messages in thread

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Thread overview: 32+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-05-18 19:45 [PATCH v6 00/17] Rearrange struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 01/17] s390: Use _refcount for pgtables Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 02/17] mm: Split page_type out from _mapcount Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 03/17] mm: Mark pages in use for page tables Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 04/17] mm: Switch s_mem and slab_cache in struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 05/17] mm: Move 'private' union within " Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 06/17] mm: Move _refcount out of struct page union Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 07/17] mm: Combine first three unions in struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 08/17] mm: Use page->deferred_list Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 09/17] mm: Move lru union within struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 10/17] mm: Combine LRU and main union in " Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 11/17] mm: Improve struct page documentation Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 12/17] mm: Add pt_mm to struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 13/17] mm: Add hmm_data " Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 14/17] slab,slub: Remove rcu_head size checks Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 15/17] slub: Remove kmem_cache->reserved Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 16/17] slub: Remove 'reserved' file from sysfs Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 17/17] mm: Distinguish VMalloc pages Matthew Wilcox
2018-05-22 16:10   ` Andrey Ryabinin
2018-05-22 17:58     ` Matthew Wilcox
2018-05-22 19:49       ` Andrew Morton
2018-05-22 19:57       ` Andrey Ryabinin
2018-05-22 20:19         ` Matthew Wilcox
2018-05-22 20:48           ` Andrew Morton
2018-05-22 21:45             ` Matthew Wilcox
2018-05-22 23:02               ` Andrew Morton
2018-05-23  6:36           ` Michal Hocko
2018-05-23  6:34         ` Michal Hocko
2018-05-23  9:14           ` Andrey Ryabinin
2018-05-23  9:25             ` Michal Hocko
2018-05-23  9:28               ` Andrey Ryabinin
2018-05-23  9:52                 ` Michal Hocko

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