Re: [PATCH *] rmap based VM #11a

Ed Tomlinson (tomlins@cam.org)
Tue, 8 Jan 2002 09:10:17 -0500


Hi,

Data point for you. On a K6-III 400, 512M, 1G swap rmap11 with the
refill_inactive change runs 'make -j bzImage' with any oom problems.
X becomes unresponsive during the run as does a serial console - will
be interesting to see if Ingo`s scheduler helps.

Ed Tomlinson

On January 8, 2002 07:45 am, Rik van Riel wrote:
> The first maintenance release of the 11th version of the reverse
> mapping based VM is now available. It fixes agpgart_be and the
> OOM killer. Tests on diskless machines are especially appreciated.
>
> 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-11a
> 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 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
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