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Subject[PATCH] rmap 14
This is a fairly minimal change for rmap14 since I've been
working on 2.5 most of the time. The experimental code in
this version is a hopefully smarter page_launder() that
shouldn't do much more IO than needed and hopefully gets
rid of the stalls that people have seen during heavy swap
activity. Please test this version. ;)


The first release of the 14th version of the reverse
mapping based VM is now available.
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:

http://surriel.com/patches/2.4/2.4.19-rmap14
and http://surriel.com/patches/2.4/incr/rmap13c-rmap14
and http://linuxvm.bkbits.net/


My big TODO items for a next release are:
- O(1) page launder - currently functional but slow, needs to be tuned
- pte-highmem

rmap 14:
- get rid of stalls during swapping, hopefully (me)
- low latency zap_page_range (Robert Love)
rmap 13c:
- add wmb() to wakeup_memwaiters (Arjan van de Ven)
- remap_pmd_range now calls pte_alloc with full address (Paul Mackerras)
- #ifdef out pte_chain_lock/unlock on UP machines (Andrew Morton)
- un-BUG() truncate_complete_page, the race is expected (Andrew Morton, me)
- remove NUMA changes from rmap13a (Christoph Hellwig)
rmap 13b:
- prevent PF_MEMALLOC recursion for higher order allocs (Arjan van de Ven, me)
- fix small SMP race, PG_lru (Hugh Dickins)
rmap 13a:
- NUMA changes for page_address (Samuel Ortiz)
- replace vm.freepages with simpler kswapd_minfree (Christoph Hellwig)
rmap 13:
- rename touch_page to mark_page_accessed and uninline (Christoph Hellwig)
- NUMA bugfix for __alloc_pages (William Irwin)
- kill __find_page (Christoph Hellwig)
- make pte_chain_freelist per zone (William Irwin)
- protect pte_chains by per-page lock bit (William Irwin)
- minor code cleanups (me)
rmap 12i:
- slab cleanup (Christoph Hellwig)
- remove references to compiler.h from mm/* (me)
- move rmap to marcelo's bk tree (me)
- minor cleanups (me)
rmap 12h:
- hopefully fix OOM detection algorithm (me)
- drop pte quicklist in anticipation of pte-highmem (me)
- replace andrea's highmem emulation by ingo's one (me)
- improve rss limit checking (Nick Piggin)
rmap 12g:
- port to armv architecture (David Woodhouse)
- NUMA fix to zone_table initialisation (Samuel Ortiz)
- remove init_page_count (David Miller)
rmap 12f:
- for_each_pgdat macro (William Lee Irwin)
- put back EXPORT(__find_get_page) for modular rd (me)
- make bdflush and kswapd actually start queued disk IO (me)
rmap 12e
- RSS limit fix, the limit can be 0 for some reason (me)
- clean up for_each_zone define to not need pgdata_t (William Lee Irwin)
- fix i810_dma bug introduced with page->wait removal (William Lee Irwin)
rmap 12d:
- fix compiler warning in rmap.c (Roger Larsson)
- read latency improvement (read-latency2) (Andrew Morton)
rmap 12c:
- fix small balancing bug in page_launder_zone (Nick Piggin)
- wakeup_kswapd / wakeup_memwaiters code fix (Arjan van de Ven)
- improve RSS limit enforcement (me)
rmap 12b:
- highmem emulation (for debugging purposes) (Andrea Arcangeli)
- ulimit RSS enforcement when memory gets tight (me)
- sparc64 page->virtual quickfix (Greg Procunier)
rmap 12a:
- fix the compile warning in buffer.c (me)
- fix divide-by-zero on highmem initialisation DOH! (me)
- remove the pgd quicklist (suspicious ...) (DaveM, me)
rmap 12:
- keep some extra free memory on large machines (Arjan van de Ven, me)
- higher-order allocation bugfix (Adrian Drzewiecki)
- nr_free_buffer_pages() returns inactive + free mem (me)
- pages from unused objects directly to inactive_clean (me)
- use fast pte quicklists on non-pae machines (Andrea Arcangeli)
- remove sleep_on from wakeup_kswapd (Arjan van de Ven)
- page waitqueue cleanup (Christoph Hellwig)
rmap 11c:
- oom_kill race locking fix (Andres Salomon)
- elevator improvement (Andrew Morton)
- dirty buffer writeout speedup (hopefully ;)) (me)
- small documentation updates (me)
- page_launder() never does synchronous IO, kswapd
and the processes calling it sleep on higher level (me)
- deadlock fix in touch_page() (me)
rmap 11b:
- added low latency reschedule points in vmscan.c (me)
- make i810_dma.c include mm_inline.h too (William Lee Irwin)
- wake up kswapd sleeper tasks on OOM kill so the
killed task can continue on its way out (me)
- tune page allocation sleep point a little (me)
rmap 11a:
- don't let refill_inactive() progress count for OOM (me)
- after an OOM kill, wait 5 seconds for the next kill (me)
- agpgart_be fix for hashed waitqueues (William Lee Irwin)
rmap 11:
- 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)
- disable the debugging code in rmap.c ... the code
is working and people are running benchmarks (me)
- let the slab cache shrink functions return a value
to help prevent early OOM killing (Ed Tomlinson)
- also, don't call the OOM code if we have enough
free pages (me)
- move the call to lru_cache_del into __free_pages_ok (Ben LaHaise)
- replace the per-page waitqueue with a hashed
waitqueue, reduces size of struct page from 64
bytes to 52 bytes (48 bytes on non-highmem machines) (William Lee Irwin)
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)
Rik
--
Bravely reimplemented by the knights who say "NIH".

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

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