[PATCH] rmap 14a

From: Rik van Riel (riel@conectiva.com.br)
Date: Sun Aug 18 2002 - 19:43:09 EST


SMP users are advised to upgrade to rmap14a. This version should be
solid ... and a bit faster.



Everybody misspells my name! - Rsty Rusl

The first maintenance 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-rmap14a 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 14a: - Ingo Molnar's per-cpu pages (SMP speedup) (Christoph Hellwig) - fix SMP bug in page_launder_zone (rmap14 only) (Arjan van de Ven) - semicolon day, fix typo in rmap.c w/ DEBUG_RMAP (Craig Kulesa) - remove unneeded pte_chain_unlock/lock pair vmscan.c (Craig Kulesa) - low latency zap_page_range also without preempt (Arjan van de Ven) - do some throughput tuning for kswapd/page_launder (me) - don't allocate swap space for pages we're not writing (me) 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)

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This archive was generated by hypermail 2b29 : Fri Aug 23 2002 - 22:00:16 EST