[PATCH *] rmap-based VM, 10c

From: Rik van Riel (riel@conectiva.com.br)
Date: Thu Jan 03 2002 - 13:47:29 EST

The 3rd maintenance release of the 10th version of the reverse mapping
based VM is now available, this version works around a quirk in the
PPC bootup code.
This is an attempt at making a more robust and flexible VM
subsystem, while cleaning up a lot of code at the same time. The patch
is available from:

and http://linuxvm.bkbits.net/

My big TODO items for a next release are:
  - fix page_launder() so it doesn't submit the whole
    inactive_dirty list for writeout in one go

rmap 11 (in progress):
  - fix stupid logic inversion bug in wakeup_kswapd() (Andrew Morton)
  - fix it again in the morning (me)
  - add #ifdef BROKEN_PPC_PTE_ALLOC_ONE to rmap.h, it
    seems PPC calls pte_alloc() before mem_map[] init (me)
rmap 10:
  - fix the livelock for real (yeah right), turned out
    to be a stupid bug in page_launder_zone() (me)
  - to make sure the VM subsystem doesn't monopolise
    the CPU, let kswapd and some apps sleep a bit under
    heavy stress situations (me)
  - let __GFP_HIGH allocations dig a little bit deeper
    into the free page pool, the SCSI layer seems fragile (me)
rmap 9:
  - improve comments all over the place (Michael Cohen)
  - don't panic if page_remove_rmap() cannot find the
    rmap in question, it's possible that the memory was
    PG_reserved and belonging to a driver, but the driver
    exited and cleared the PG_reserved bit (me)
  - fix the VM livelock by replacing > by >= in a few
    critical places in the pageout code (me)
  - treat the reclaiming of an inactive_clean page like
    allocating a new page, calling try_to_free_pages()
    and/or fixup_freespace() if required (me)
  - when low on memory, don't make things worse by
    doing swapin_readahead (me)
rmap 8:
  - add ANY_ZONE to the balancing functions to improve
    kswapd's balancing a bit (me)
  - regularize some of the maximum loop bounds in
    vmscan.c for cosmetic purposes (William Lee Irwin)
  - move page_address() to architecture-independent
    code, now the removal of page->virtual is portable (William Lee Irwin)
  - speed up free_area_init_core() by doing a single
    pass over the pages and not using atomic ops (William Lee Irwin)
  - documented the buddy allocator in page_alloc.c (William Lee Irwin)
rmap 7:
  - clean up and document vmscan.c (me)
  - reduce size of page struct, part one (William Lee Irwin)
  - add rmap.h for other archs (untested, not for ARM) (me)
rmap 6:
  - make the active and inactive_dirty list per zone,
    this is finally possible because we can free pages
    based on their physical address (William Lee Irwin)
  - cleaned up William's code a bit (me)
  - turn some defines into inlines and move those to
    mm_inline.h (the includes are a mess ...) (me)
  - improve the VM balancing a bit (me)
  - add back inactive_target to /proc/meminfo (me)
rmap 5:
  - fixed recursive buglet, introduced by directly
    editing the patch for making rmap 4 ;))) (me)
rmap 4:
  - look at the referenced bits in page tables (me)
rmap 3:
  - forgot one FASTCALL definition (me)
rmap 2:
  - teach try_to_unmap_one() about mremap() (me)
  - don't assign swap space to pages with buffers (me)
  - make the rmap.c functions FASTCALL / inline (me)
rmap 1:
  - fix the swap leak in rmap 0 (Dave McCracken)
rmap 0:
  - port of reverse mapping VM to 2.4.16 (me)


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http://www.surriel.com/ http://distro.conectiva.com/

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