)]}'
{
  "log": [
    {
      "commit": "5ce7852cdf07ab903fb1c72d0915ac492c6e07c7",
      "tree": "7992224cd306be5e827de0bdf6255bc87a2bf4c8",
      "parents": [
        "dd81eca83c8300c95d8a1eaf0d38f56513711535"
      ],
      "author": {
        "name": "Adrian Bunk",
        "email": "bunk@stusta.de",
        "time": "Sat Sep 10 00:26:28 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Sat Sep 10 10:06:25 2005 -0700"
      },
      "message": "[PATCH] mm/filemap.c: make two functions static\n\nWith Nick Piggin \u003cnpiggin@suse.de\u003e\n\nGive some things static scope.\n\nSigned-off-by: Adrian Bunk \u003cbunk@stusta.de\u003e\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "a600388d28419305aad3c4c0af52c223cf6fa0af",
      "tree": "c70d3d80275f189c49311183472367f45d1a1ef2",
      "parents": [
        "fa5b08d5f818063d18433194f20359ef2ae50254"
      ],
      "author": {
        "name": "Zachary Amsden",
        "email": "zach@vmware.com",
        "time": "Sat Sep 03 15:55:04 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@evo.osdl.org",
        "time": "Mon Sep 05 00:05:48 2005 -0700"
      },
      "message": "[PATCH] x86: ptep_clear optimization\n\nAdd a new accessor for PTEs, which passes the full hint from the mmu_gather\nstruct; this allows architectures with hardware pagetables to optimize away\natomic PTE operations when destroying an address space.  Removing the\nlocked operation should allow better pipelining of memory access in this\nloop.  I measured an average savings of 30-35 cycles per zap_pte_range on\nthe first 500 destructions on Pentium-M, but I believe the optimization\nwould win more on older processors which still assert the bus lock on xchg\nfor an exclusive cacheline.\n\nUpdate: I made some new measurements, and this saves exactly 26 cycles over\nptep_get_and_clear on Pentium M.  On P4, with a PAE kernel, this saves 180\ncycles per ptep_get_and_clear, for a whopping 92160 cycles savings for a\nfull address space destruction.\n\npte_clear_full is not yet used, but is provided for future optimizations\n(in particular, when running inside of a hypervisor that queues page table\nupdates, the full hint allows us to avoid queueing unnecessary page table\nupdate for an address space in the process of being destroyed.\n\nThis is not a huge win, but it does help a bit, and sets the stage for\nfurther hypervisor optimization of the mm layer on all architectures.\n\nSigned-off-by: Zachary Amsden \u003czach@vmware.com\u003e\nCc: Christoph Lameter \u003cchristoph@lameter.com\u003e\nCc: \u003clinux-mm@kvack.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "4944e76d81801b8e60ed3e7789443f210c16ed65",
      "tree": "d20096acf35b1af03eba1d043e6376a154cae054",
      "parents": [
        "d44ed4f86892e350f4b16a3489b7e7c1a9bb7ead"
      ],
      "author": {
        "name": "Paolo \u0027Blaisorblade\u0027 Giarrusso",
        "email": "blaisorblade@yahoo.it",
        "time": "Sat Sep 03 15:54:56 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@evo.osdl.org",
        "time": "Mon Sep 05 00:05:45 2005 -0700"
      },
      "message": "[PATCH] mm: remove implied vm_ops check\n\nIf !vma-\u003evm-ops we already BUG above, so retesting it is useless.  The\ncompiler cannot optimize this because BUG is a macro and is not thus marked\nnoreturn; that should possibly be fixed.\n\nSigned-off-by: Paolo \u0027Blaisorblade\u0027 Giarrusso \u003cblaisorblade@yahoo.it\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "d992895ba2b27cf5adf1ba0ad6d27662adc54c5e",
      "tree": "65a4d1f18a93a9e89d43fe0b8e0b3009675c50f0",
      "parents": [
        "40193713df2cdb9c233b3fc2029ecdccb40cb1e4"
      ],
      "author": {
        "name": "Nick Piggin",
        "email": "nickpiggin@yahoo.com.au",
        "time": "Sun Aug 28 16:49:11 2005 +1000"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Mon Aug 29 17:25:04 2005 -0700"
      },
      "message": "[PATCH] Lazy page table copies in fork()\n\nDefer copying of ptes until fault time when it is possible to reconstruct\nthe pte from backing store. Idea from Andi Kleen and Nick Piggin.\n\nThanks to input from Rik van Riel and Linus and to Hugh for correcting\nmy blundering.\n\nRay Fucillo \u003cfucillo@intersystems.com\u003e reports:\n\n  \"I applied this latest patch to a 2.6.12 kernel and found that it does\n   resolve the problem.  Prior to the patch on this machine, I was\n   seeing about 23ms spent in fork for ever 100MB of shared memory\n   segment.\n\n   After applying the patch, fork is taking about 1ms regardless of the\n   shared memory size.\"\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "a68d2ebc1581a3aec57bd032651e013fa609f530",
      "tree": "b41977c7157d7e26f37e9cb502cd1afbbddcbc17",
      "parents": [
        "f33ea7f404e592e4563b12101b7a4d17da6558d7"
      ],
      "author": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Aug 03 10:07:09 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Aug 03 10:07:09 2005 -0700"
      },
      "message": "Fix up recent get_user_pages() handling\n\nThe VM_FAULT_WRITE thing is an extra bit, not a valid return value, and\nhas to be treated as such by get_user_pages().\n\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "f33ea7f404e592e4563b12101b7a4d17da6558d7",
      "tree": "1d587ad8a06cb6d2e3a187f0312c8a524ffefe53",
      "parents": [
        "5cb4cc0d8211c490537c8568001958fc76741312"
      ],
      "author": {
        "name": "Nick Piggin",
        "email": "nickpiggin@yahoo.com.au",
        "time": "Wed Aug 03 20:24:01 2005 +1000"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Aug 03 09:12:05 2005 -0700"
      },
      "message": "[PATCH] fix get_user_pages bug\n\nChecking pte_dirty instead of pte_write in __follow_page is problematic\nfor s390, and for copy_one_pte which leaves dirty when clearing write.\n\nSo revert __follow_page to check pte_write as before, and make\ndo_wp_page pass back a special extra VM_FAULT_WRITE bit to say it has\ndone its full job: once get_user_pages receives this value, it no longer\nrequires pte_write in __follow_page.\n\nBut most callers of handle_mm_fault, in the various architectures, have\nswitch statements which do not expect this new case.  To avoid changing\nthem all in a hurry, make an inline wrapper function (using the old\nname) that masks off the new bit, and use the extended interface with\ndouble underscores.\n\nYes, we do have a call to do_wp_page from do_swap_page, but no need to\nchange that: in rare case it\u0027s needed, another do_wp_page will follow.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\n[ Cleanups by Nick Piggin ]\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "690dbe1ced143876d8fa56b72310738dbe079d0a",
      "tree": "4297d5647ce5e6cbe429dc506007579952c31015",
      "parents": [
        "74f9c9c258249fba3e2e78f70691528426a6c010"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Mon Aug 01 21:11:42 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Mon Aug 01 21:38:00 2005 -0700"
      },
      "message": "[PATCH] x86_64: access of some bad address\n\nx86_64 has a large sparse gate area between VSYSCALL_START and\nVSYSCALL_END, not all of it presently backed by pmds.  Alexander Nyberg has\nfound that in some circumstances gdb may try to ptrace here, and hit\nget_user_pages BUG_ON.  It seems odd that gdb should be accessing here, but\nit certainly shouldn\u0027t crash in this way: relax BUG_ON to -EFAULT.  Fixes\nkernel bugzilla #4801.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Andi Kleen \u003cak@suse.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "4ceb5db9757aaeadcf8fbbf97d76bd42aa4df0d6",
      "tree": "6a3108ceea457c21130838d49736f5e9de3badc3",
      "parents": [
        "8d894c47975f7222c5537e450e71310b395488c7"
      ],
      "author": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Mon Aug 01 11:14:49 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Mon Aug 01 11:14:49 2005 -0700"
      },
      "message": "Fix get_user_pages() race for write access\n\nThere\u0027s no real guarantee that handle_mm_fault() will always be able to\nbreak a COW situation - if an update from another thread ends up\nmodifying the page table some way, handle_mm_fault() may end up\nrequiring us to re-try the operation.\n\nThat\u0027s normally fine, but get_user_pages() ended up re-trying it as a\nread, and thus a write access could in theory end up losing the dirty\nbit or be done on a page that had not been properly COW\u0027ed.\n\nThis makes get_user_pages() always retry write accesses as write\naccesses by making \"follow_page()\" require that a writable follow has\nthe dirty bit set.  That simplifies the code and solves the race: if the\nCOW break fails for some reason, we\u0027ll just loop around and try again.\n\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "1aaf18ff9de1f37bf674236fc0779c3aaa65b998",
      "tree": "53df4d3dd0fbd81b79d5cdb63cf0d11853307a6b",
      "parents": [
        "0cfc11ed45e4c00750039e5a18c0fc0d681e19db"
      ],
      "author": {
        "name": "Andrew Morton",
        "email": "akpm@osdl.org",
        "time": "Wed Jul 27 11:43:54 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Jul 27 16:25:53 2005 -0700"
      },
      "message": "[PATCH] check_user_page_readable() deadlock fix\n\nFix bug identifued by Richard Purdie \u003crpurdie@rpsys.net\u003e.\n\noprofile calls check_user_page_readable() from interrupt context, so we\ndeadlock over various VFS locks.\n\nBut check_user_page_readable() doesn\u0027t imply either a read or a write of the\npage\u0027s contents.  Change __follow_page() so that check_user_page_readable()\ncan tell __follow_page() that we\u0027re not accessing the page\u0027s contents, and use\nthat info to avoid the troublesome lock-takings.\n\nAlso, make follow_page() inline for the single callsite in memory.c to save a\nbit of stack space.\n\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "2d15cab85b85a56cc886037cab43cc292923ff22",
      "tree": "55de7526dfb766067821d552892ad43b32f78c35",
      "parents": [
        "1e8a81c5a37907bc082025d3468718116dca1eeb"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Sat Jun 25 14:54:33 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sat Jun 25 16:24:26 2005 -0700"
      },
      "message": "[PATCH] mm: fix remap_pte_range BUG\n\nOut-of-tree user of remap_pfn_range hit kernel BUG at mm/memory.c:1112!  It\npasses an unrounded size to remap_pfn_range, which was okay before 2.6.12,\nbut misses remap_pte_range\u0027s new end condition.  An audit of all the other\nptwalks confirms that this is the only one so exposed.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "3d41088fa327782b14b5659dbcfff62ec704c23c",
      "tree": "bd9a25f9ae7a0e232c9d5006849905e31a9dbc92",
      "parents": [
        "363412b4f70a2ba19c76a01da7580472399312d4"
      ],
      "author": {
        "name": "Martin Waitz",
        "email": "tali@admingilde.org",
        "time": "Thu Jun 23 22:05:21 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Fri Jun 24 00:06:40 2005 -0700"
      },
      "message": "[PATCH] DocBook: update comments\n\nThis patch updates some comments to match code changes.\n\nSigned-off-by: Martin Waitz \u003ctali@admingilde.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "d41dee369bff3b9dcb6328d4d822926c28cc2594",
      "tree": "a0405f3b7af3ebca21838a7d427bd75a067bf850",
      "parents": [
        "af705362ab6018071310c5fcd436a6b457517d5f"
      ],
      "author": {
        "name": "Andy Whitcroft",
        "email": "apw@shadowen.org",
        "time": "Thu Jun 23 00:07:54 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Thu Jun 23 09:45:04 2005 -0700"
      },
      "message": "[PATCH] sparsemem memory model\n\nSparsemem abstracts the use of discontiguous mem_maps[].  This kind of\nmem_map[] is needed by discontiguous memory machines (like in the old\nCONFIG_DISCONTIGMEM case) as well as memory hotplug systems.  Sparsemem\nreplaces DISCONTIGMEM when enabled, and it is hoped that it can eventually\nbecome a complete replacement.\n\nA significant advantage over DISCONTIGMEM is that it\u0027s completely separated\nfrom CONFIG_NUMA.  When producing this patch, it became apparent in that NUMA\nand DISCONTIG are often confused.\n\nAnother advantage is that sparse doesn\u0027t require each NUMA node\u0027s ranges to be\ncontiguous.  It can handle overlapping ranges between nodes with no problems,\nwhere DISCONTIGMEM currently throws away that memory.\n\nSparsemem uses an array to provide different pfn_to_page() translations for\neach SECTION_SIZE area of physical memory.  This is what allows the mem_map[]\nto be chopped up.\n\nIn order to do quick pfn_to_page() operations, the section number of the page\nis encoded in page-\u003eflags.  Part of the sparsemem infrastructure enables\nsharing of these bits more dynamically (at compile-time) between the\npage_zone() and sparsemem operations.  However, on 32-bit architectures, the\nnumber of bits is quite limited, and may require growing the size of the\npage-\u003eflags type in certain conditions.  Several things might force this to\noccur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of\nmemory), an increase in the physical address space, or an increase in the\nnumber of used page-\u003eflags.\n\nOne thing to note is that, once sparsemem is present, the NUMA node\ninformation no longer needs to be stored in the page-\u003eflags.  It might provide\nspeed increases on certain platforms and will be stored there if there is\nroom.  But, if out of room, an alternate (theoretically slower) mechanism is\nused.\n\nThis patch introduces CONFIG_FLATMEM.  It is used in almost all cases where\nthere used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM\noften have to compile out the same areas of code.\n\nSigned-off-by: Andy Whitcroft \u003capw@shadowen.org\u003e\nSigned-off-by: Dave Hansen \u003chaveblue@us.ibm.com\u003e\nSigned-off-by: Martin Bligh \u003cmbligh@aracnet.com\u003e\nSigned-off-by: Adrian Bunk \u003cbunk@stusta.de\u003e\nSigned-off-by: Yasunori Goto \u003cy-goto@jp.fujitsu.com\u003e\nSigned-off-by: Bob Picco \u003cbob.picco@hp.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "c475a8ab625d567eacf5e30ec35d6d8704558062",
      "tree": "0971bef7b876f1b3eb160621fc2b61cb5313827b",
      "parents": [
        "d296e9cd02c92e576ecce5344026a4df4353cdb2"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Tue Jun 21 17:15:12 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Tue Jun 21 18:46:21 2005 -0700"
      },
      "message": "[PATCH] can_share_swap_page: use page_mapcount\n\nRemember that ironic get_user_pages race?  when the raised page_count on a\npage swapped out led do_wp_page to decide that it had to copy on write, so\nsubstituted a different page into userspace.  2.6.7 onwards have Andrea\u0027s\nsolution, where try_to_unmap_one backs out if it finds page_count raised.\n\nWhich works, but is unsatisfying (rmap.c has no other page_count heuristics),\nand was found a few months ago to hang an intensive page migration test.  A\nyear ago I was hesitant to engage page_mapcount, now it seems the right fix.\n\nSo remove the page_count hack from try_to_unmap_one; and use activate_page in\nunuse_mm when dropping lock, to replace its secondary effect of helping\nswapoff to make progress in that case.\n\nSimplify can_share_swap_page (now called only on anonymous pages) to check\npage_mapcount + page_swapcount \u003d\u003d 1: still needs the page lock to stabilize\ntheir (pessimistic) sum, but does not need swapper_space.tree_lock for that.\n\nIn do_swap_page, move swap_free and unlock_page below page_add_anon_rmap, to\nkeep sum on the high side, and correct when can_share_swap_page called.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "d296e9cd02c92e576ecce5344026a4df4353cdb2",
      "tree": "76af62c5d2c16e89672f71f2f4c7a65aa36ff914",
      "parents": [
        "08ef472937e918875a82fd350d3de138aac50414"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Tue Jun 21 17:15:11 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Tue Jun 21 18:46:21 2005 -0700"
      },
      "message": "[PATCH] do_wp_page: cannot share file page\n\nA small optimization to do_wp_page\u0027s check for whether to avoid copy by\nreusing the page already mapped.  It can never share a cached file page,\nnor can it share a reserved page (often the empty zero page), so it\u0027s a\nwaste of time to lock and unlock in those cases.  Which nowadays can both\nbe neatly excluded by a preliminary PageAnon test.\n\nChristoph has reported that a preliminary page_count test proved valuable\nfor scalability here, but PageAnon covers more common cases all at once.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "08ef472937e918875a82fd350d3de138aac50414",
      "tree": "990a503a711b82f94ad78ea5794a46992db05228",
      "parents": [
        "7c2f3fda5666c280bcd00ac3b86963270b23e796"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Tue Jun 21 17:15:10 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Tue Jun 21 18:46:21 2005 -0700"
      },
      "message": "[PATCH] get_user_pages: kill get_page_map\n\nSince its birth, get_user_pages has been calling a misguided get_page_map\nfunction.  follow_page has already returned NULL if the pfn is invalid, we\ncannot reach an invalid pfn from a validated struct page.\n\nRemove get_page_map, and the messy rewind in get_user_pages to cope with\nits failure.  Oh, and could we please call that \"struct page *page\" like\neverywhere else, instead of \"struct page *map\"?\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "b81074800b98ac50b64d4c8d34e8abf0fda5e3d1",
      "tree": "01b5114255fcf1ea8ea15fabe08cc9782131e684",
      "parents": [
        "c64610ba585fabb36be78782868277f3d9741a2e"
      ],
      "author": {
        "name": "Kirill Korotaev",
        "email": "dev@sw.ru",
        "time": "Mon May 16 21:53:50 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Tue May 17 07:59:20 2005 -0700"
      },
      "message": "[PATCH] do_swap_page() can map random data if swap read fails\n\nThere is a bug in do_swap_page(): when swap page happens to be unreadable,\npage filled with random data is mapped into user address space.  The fix is\nto check for PageUptodate and send SIGBUS in case of error.\n\nSigned-Off-By: Kirill Korotaev \u003cdev@sw.ru\u003e\nSigned-Off-By: Alexey Kuznetsov \u003ckuznet@ms2.inr.ac.ru\u003e\nAcked-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "3bf5ee95648c694bac4d13529563c230cd4fe5f2",
      "tree": "9430e6e4f4c3d586ecb7375cd780fd17694888c7",
      "parents": [
        "ee39b37b23da0b6ec53a8ebe90ff41c016f8ae27"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Tue Apr 19 13:29:16 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org.(none)",
        "time": "Tue Apr 19 13:29:16 2005 -0700"
      },
      "message": "[PATCH] freepgt: hugetlb_free_pgd_range\n\nia64 and ppc64 had hugetlb_free_pgtables functions which were no longer being\ncalled, and it wasn\u0027t obvious what to do about them.\n\nThe ppc64 case turns out to be easy: the associated tables are noted elsewhere\nand freed later, safe to either skip its hugetlb areas or go through the\nmotions of freeing nothing.  Since ia64 does need a special case, restore to\nppc64 the special case of skipping them.\n\nThe ia64 hugetlb case has been broken since pgd_addr_end went in, though it\nprobably appeared to work okay if you just had one such area; in fact it\u0027s\nbeen broken much longer if you consider a long munmap spanning from another\nregion into the hugetlb region.\n\nIn the ia64 hugetlb region, more virtual address bits are available than in\nthe other regions, yet the page tables are structured the same way: the page\nat the bottom is larger.  Here we need to scale down each addr before passing\nit to the standard free_pgd_range.  Was about to write a hugely_scaled_down\nmacro, but found htlbpage_to_page already exists for just this purpose.  Fixed\noff-by-one in ia64 is_hugepage_only_range.\n\nUninline free_pgd_range to make it available to ia64.  Make sure the\nvma-gathering loop in free_pgtables cannot join a hugepage_only_range to any\nother (safe to join huges?  probably but don\u0027t bother).\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "ee39b37b23da0b6ec53a8ebe90ff41c016f8ae27",
      "tree": "4af606913ab8f95551623b788c0c66c1f5902229",
      "parents": [
        "e0da382c92626ad1d7f4b7527d19b80104d67a83"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Tue Apr 19 13:29:15 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org.(none)",
        "time": "Tue Apr 19 13:29:15 2005 -0700"
      },
      "message": "[PATCH] freepgt: remove MM_VM_SIZE(mm)\n\nThere\u0027s only one usage of MM_VM_SIZE(mm) left, and it\u0027s a troublesome macro\nbecause mm doesn\u0027t contain the (32-bit emulation?) info needed.  But it too is\nonly needed because we ignore the end from the vma list.\n\nWe could make flush_pgtables return that end, or unmap_vmas.  Choose the\nlatter, since it\u0027s a natural fit with unmap_mapping_range_vma needing to know\nits restart addr.  This does make more than minimal change, but if unmap_vmas\nhad returned the end before, this is how we\u0027d have done it, rather than\nstoring the break_addr in zap_details.\n\nunmap_vmas used to return count of vmas scanned, but that\u0027s just debug which\nhasn\u0027t been useful in a while; and if we want the map_count 0 on exit check\nback, it can easily come from the final remove_vm_struct loop.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "e0da382c92626ad1d7f4b7527d19b80104d67a83",
      "tree": "b3f455518c286ee14cb2755ced8808487bca7911",
      "parents": [
        "9f6c6fc505560465be0964eb4da1b6ca97bd3951"
      ],
      "author": {
        "name": "Hugh Dickins",
        "email": "hugh@veritas.com",
        "time": "Tue Apr 19 13:29:15 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org.(none)",
        "time": "Tue Apr 19 13:29:15 2005 -0700"
      },
      "message": "[PATCH] freepgt: free_pgtables use vma list\n\nRecent woes with some arches needing their own pgd_addr_end macro; and 4-level\nclear_page_range regression since 2.6.10\u0027s clear_page_tables; and its\nlong-standing well-known inefficiency in searching throughout the higher-level\npage tables for those few entries to clear and free: all can be blamed on\nignoring the list of vmas when we free page tables.\n\nReplace exit_mmap\u0027s clear_page_range of the total user address space by\nfree_pgtables operating on the mm\u0027s vma list; unmap_region use it in the same\nway, giving floor and ceiling beyond which it may not free tables.  This\nbrings lmbench fork/exec/sh numbers back to 2.6.10 (unless preempt is enabled,\nin which case latency fixes spoil unmap_vmas throughput).\n\nBeware: the do_mmap_pgoff driver failure case must now use unmap_region\ninstead of zap_page_range, since a page table might have been allocated, and\ncan only be freed while it is touched by some vma.\n\nMove free_pgtables from mmap.c to memory.c, where its lower levels are adapted\nfrom the clear_page_range levels.  (Most of free_pgtables\u0027 old code was\nactually for a non-existent case, prev not properly set up, dating from before\nhch gave us split_vma.) Pass mmu_gather** in the public interfaces, since we\nmight want to add latency lockdrops later; but no attempt to do so yet, going\nby vma should itself reduce latency.\n\nBut what if is_hugepage_only_range?  Those ia64 and ppc64 cases need careful\nexamination: put that off until a later patch of the series.\n\nWhat of x86_64\u0027s 32bit vdso page __map_syscall32 maps outside any vma?\n\nAnd the range to sparc64\u0027s flush_tlb_pgtables?  It\u0027s less clear to me now that\nwe need to do more than is done here - every PMD_SIZE ever occupied will be\nflushed, do we really have to flush every PGDIR_SIZE ever partially occupied? \nA shame to complicate it unnecessarily.\n\nSpecial thanks to David Miller for time spent repairing my ceilings.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
      "tree": "0bba044c4ce775e45a88a51686b5d9f90697ea9d",
      "parents": [],
      "author": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sat Apr 16 15:20:36 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sat Apr 16 15:20:36 2005 -0700"
      },
      "message": "Linux-2.6.12-rc2\n\nInitial git repository build. I\u0027m not bothering with the full history,\neven though we have it. We can create a separate \"historical\" git\narchive of that later if we want to, and in the meantime it\u0027s about\n3.2GB when imported into git - space that would just make the early\ngit days unnecessarily complicated, when we don\u0027t have a lot of good\ninfrastructure for it.\n\nLet it rip!\n"
    }
  ]
}