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SubjectRe: [PATCH *] rmap based VM 12e

Giving this a shot shortly. Will report results.

Shawn.

On Mon, 11 Feb 2002, Rik van Riel wrote:

> Both RSS limits and page aging seem to work now, please test.
>
> The fifth maintenance release of the 12th 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/2.4/2.4.17-rmap-12e
> and http://linuxvm.bkbits.net/
>
>
> My big TODO items for a next release are:
> - auto-tuning readahead, readahead per VMA
> - fix starvation issue in get_request_wait()
>
> 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
> --
> "Linux holds advantages over the single-vendor commercial OS"
> -- Microsoft's "Competing with Linux" document
>
> http://www.surriel.com/ http://distro.conectiva.com/
>
>
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