)]}' { "log": [ { "commit": "9637a5efd4fbe36164c5ce7f6a0ee68b2bf22b7f", "tree": "38b86e3e2151e78f952076e36bee4fd7d77e3baf", "parents": [ "bd96b9eb7cfd6ab24ba244360a09980a720874d2" ], "author": { "name": "David Howells", "email": "dhowells@redhat.com", "time": "Fri Jun 23 02:03:43 2006 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Fri Jun 23 07:42:51 2006 -0700" }, "message": "[PATCH] add page_mkwrite() vm_operations method\n\nAdd a new VMA operation to notify a filesystem or other driver about the\nMMU generating a fault because userspace attempted to write to a page\nmapped through a read-only PTE.\n\nThis facility permits the filesystem or driver to:\n\n (*) Implement storage allocation/reservation on attempted write, and so to\n deal with problems such as ENOSPC more gracefully (perhaps by generating\n SIGBUS).\n\n (*) Delay making the page writable until the contents have been written to a\n backing cache. This is useful for NFS/AFS when using FS-Cache/CacheFS.\n It permits the filesystem to have some guarantee about the state of the\n cache.\n\n (*) Account and limit number of dirty pages. This is one piece of the puzzle\n needed to make shared writable mapping work safely in FUSE.\n\nNeeded by cachefs (Or is it cachefiles? Or fscache? \u003chead spins\u003e).\n\nAt least four other groups have stated an interest in it or a desire to use\nthe functionality it provides: FUSE, OCFS2, NTFS and JFFS2. Also, things like\nEXT3 really ought to use it to deal with the case of shared-writable mmap\nencountering ENOSPC before we permit the page to be dirtied.\n\nFrom: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\n\n get_user_pages(.write\u003d1, .force\u003d1) can generate COW hits on read-only\n shared mappings, this patch traps those as mkpage_write candidates and fails\n to handle them the old way.\n\nSigned-off-by: David Howells \u003cdhowells@redhat.com\u003e\nCc: Miklos Szeredi \u003cmiklos@szeredi.hu\u003e\nCc: Joel Becker \u003cJoel.Becker@oracle.com\u003e\nCc: Mark Fasheh \u003cmark.fasheh@oracle.com\u003e\nCc: Anton Altaparmakov \u003caia21@cantab.net\u003e\nCc: David Woodhouse \u003cdwmw2@infradead.org\u003e\nCc: 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": "0697212a411c1dae03c27845f2de2f3adb32c331", "tree": "4bedcdb27522f4a42c422e0a8af155501f43a69c", "parents": [ "8351a6e4785218a2b03c142be92926baff95ba5c" ], "author": { "name": "Christoph Lameter", "email": "clameter@sgi.com", "time": "Fri Jun 23 02:03:35 2006 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Fri Jun 23 07:42:50 2006 -0700" }, "message": "[PATCH] Swapless page migration: add R/W migration entries\n\nImplement read/write migration ptes\n\nWe take the upper two swapfiles for the two types of migration ptes and define\na series of macros in swapops.h.\n\nThe VM is modified to handle the migration entries. migration entries can\nonly be encountered when the page they are pointing to is locked. This limits\nthe number of places one has to fix. We also check in copy_pte_range and in\nmprotect_pte_range() for migration ptes.\n\nWe check for migration ptes in do_swap_cache and call a function that will\nthen wait on the page lock. This allows us to effectively stop all accesses\nto apge.\n\nMigration entries are created by try_to_unmap if called for migration and\nremoved by local functions in migrate.c\n\nFrom: Hugh Dickins \u003chugh@veritas.com\u003e\n\n Several times while testing swapless page migration (I\u0027ve no NUMA, just\n hacking it up to migrate recklessly while running load), I\u0027ve hit the\n BUG_ON(!PageLocked(p)) in migration_entry_to_page.\n\n This comes from an orphaned migration entry, unrelated to the current\n correctly locked migration, but hit by remove_anon_migration_ptes as it\n checks an address in each vma of the anon_vma list.\n\n Such an orphan may be left behind if an earlier migration raced with fork:\n copy_one_pte can duplicate a migration entry from parent to child, after\n remove_anon_migration_ptes has checked the child vma, but before it has\n removed it from the parent vma. (If the process were later to fault on this\n orphaned entry, it would hit the same BUG from migration_entry_wait.)\n\n This could be fixed by locking anon_vma in copy_one_pte, but we\u0027d rather\n not. There\u0027s no such problem with file pages, because vma_prio_tree_add\n adds child vma after parent vma, and the page table locking at each end is\n enough to serialize. Follow that example with anon_vma: add new vmas to the\n tail instead of the head.\n\n (There\u0027s no corresponding problem when inserting migration entries,\n because a missed pte will leave the page count and mapcount high, which is\n allowed for. And there\u0027s no corresponding problem when migrating via swap,\n because a leftover swap entry will be correctly faulted. But the swapless\n method has no refcounting of its entries.)\n\nFrom: Ingo Molnar \u003cmingo@elte.hu\u003e\n\n pte_unmap_unlock() takes the pte pointer as an argument.\n\nFrom: Hugh Dickins \u003chugh@veritas.com\u003e\n\n Several times while testing swapless page migration, gcc has tried to exec\n a pointer instead of a string: smells like COW mappings are not being\n properly write-protected on fork.\n\n The protection in copy_one_pte looks very convincing, until at last you\n realize that the second arg to make_migration_entry is a boolean \"write\",\n and SWP_MIGRATION_READ is 30.\n\n Anyway, it\u0027s better done like in change_pte_range, using\n is_write_migration_entry and make_migration_entry_read.\n\nFrom: Hugh Dickins \u003chugh@veritas.com\u003e\n\n Remove unnecessary obfuscation from sys_swapon\u0027s range check on swap type,\n which blew up causing memory corruption once swapless migration made\n MAX_SWAPFILES no longer 2 ^ MAX_SWAPFILES_SHIFT.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-by: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Christoph Lameter \u003cclameter@engr.sgi.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nFrom: 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": "b344e05c585406904c70865e531e02467c4c7931", "tree": "5c9b9be9c35f5921e4796f1bafab810839765354", "parents": [ "cfd9b7df4abd3257c9e381b0e445817b26a51c0c" ], "author": { "name": "Hua Zhong", "email": "hzhong@gmail.com", "time": "Fri Jun 23 02:03:23 2006 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Fri Jun 23 07:42:49 2006 -0700" }, "message": "[PATCH] likely cleanup: remove unlikely in sys_mprotect()\n\nWith likely/unlikely profiling on my not-so-busy-typical-developmentsystem\nthere are 5k misses vs 2k hits. So I guess we should remove the unlikely.\n\nSigned-off-by: Hua Zhong \u003chzhong@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "8f860591ffb29738cf5539b6fbf27f50dcdeb380", "tree": "4265e45c4a79d86a16cd5175a836e8c531be8117", "parents": [ "aed75ff3caafce404d9be7f0c088716375be5279" ], "author": { "name": "Zhang, Yanmin", "email": "yanmin_zhang@linux.intel.com", "time": "Wed Mar 22 00:08:50 2006 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Wed Mar 22 07:54:03 2006 -0800" }, "message": "[PATCH] Enable mprotect on huge pages\n\n2.6.16-rc3 uses hugetlb on-demand paging, but it doesn_t support hugetlb\nmprotect.\n\nFrom: David Gibson \u003cdavid@gibson.dropbear.id.au\u003e\n\n Remove a test from the mprotect() path which checks that the mprotect()ed\n range on a hugepage VMA is hugepage aligned (yes, really, the sense of\n is_aligned_hugepage_range() is the opposite of what you\u0027d guess :-/).\n\n In fact, we don\u0027t need this test. If the given addresses match the\n beginning/end of a hugepage VMA they must already be suitably aligned. If\n they don\u0027t, then mprotect_fixup() will attempt to split the VMA. The very\n first test in split_vma() will check for a badly aligned address on a\n hugepage VMA and return -EINVAL if necessary.\n\nFrom: \"Chen, Kenneth W\" \u003ckenneth.w.chen@intel.com\u003e\n\n On i386 and x86-64, pte flag _PAGE_PSE collides with _PAGE_PROTNONE. The\n identify of hugetlb pte is lost when changing page protection via mprotect.\n A page fault occurs later will trigger a bug check in huge_pte_alloc().\n\n The fix is to always make new pte a hugetlb pte and also to clean up\n legacy code where _PAGE_PRESENT is forced on in the pre-faulting day.\n\nSigned-off-by: Zhang Yanmin \u003cyanmin.zhang@intel.com\u003e\nCc: David Gibson \u003cdavid@gibson.dropbear.id.au\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nCc: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nCc: Paul Mackerras \u003cpaulus@samba.org\u003e\nCc: William Lee Irwin III \u003cwli@holomorphy.com\u003e\nSigned-off-by: Ken Chen \u003ckenneth.w.chen@intel.com\u003e\nSigned-off-by: Nishanth Aravamudan \u003cnacc@us.ibm.com\u003e\nCc: Andi Kleen \u003cak@muc.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "83e9b7e929d1323b9a155d186f77aa8c06155cc3", "tree": "3cad39e867ca337b08bc4a7309c2b17787abd527", "parents": [ "ed5297a94090d9a9f27b0ce1f9601ebe73561cff" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Mon Nov 21 21:32:12 2005 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Tue Nov 22 09:13:42 2005 -0800" }, "message": "[PATCH] unpaged: private write VM_RESERVED\n\nThe PageReserved removal in 2.6.15-rc1 issued a \"deprecated\" message when you\ntried to mmap or mprotect MAP_PRIVATE PROT_WRITE a VM_RESERVED, and failed\nwith -EACCES: because do_wp_page lacks the refinement to COW pages in those\nareas, nor do we expect to find anonymous pages in them; and it seemed just\nbloat to add code for handling such a peculiar case. But immediately it\ncaused vbetool and ddcprobe (using lrmi) to fail.\n\nSo revert the \"deprecated\" messages, letting mmap and mprotect succeed. But\nleave do_wp_page\u0027s BUG_ON(vma-\u003evm_flags \u0026 VM_RESERVED) in place until we\u0027ve\nadded the code to do it right: so this particular patch is only good if the\napp doesn\u0027t really need to write to that private area.\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": "705e87c0c3c38424f7f30556c85bc20e808d2f59", "tree": "7a237e6266f4801385e1226cc497b47e3a2458bd", "parents": [ "8f4e2101fd7df9031a754eedb82e2060b51f8c45" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Sat Oct 29 18:16:27 2005 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Sat Oct 29 21:40:40 2005 -0700" }, "message": "[PATCH] mm: pte_offset_map_lock loops\n\nConvert those common loops using page_table_lock on the outside and\npte_offset_map within to use just pte_offset_map_lock within instead.\n\nThese all hold mmap_sem (some exclusively, some not), so at no level can a\npage table be whipped away from beneath them. But whereas pte_alloc loops\ntested with the \"atomic\" pmd_present, these loops are testing with pmd_none,\nwhich on i386 PAE tests both lower and upper halves.\n\nThat\u0027s now unsafe, so add a cast into pmd_none to test only the vital lower\nhalf: we lose a little sensitivity to a corrupt middle directory, but not\nenough to worry about. It appears that i386 and UML were the only\narchitectures vulnerable in this way, and pgd and pud no problem.\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": "b5810039a54e5babf428e9a1e89fc1940fabff11", "tree": "835836cb527ec9bd525f93eb7e016f3dfb8c8ae2", "parents": [ "f9c98d0287de42221c624482fd4f8d485c98ab22" ], "author": { "name": "Nick Piggin", "email": "nickpiggin@yahoo.com.au", "time": "Sat Oct 29 18:16:12 2005 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Sat Oct 29 21:40:39 2005 -0700" }, "message": "[PATCH] core remove PageReserved\n\nRemove PageReserved() calls from core code by tightening VM_RESERVED\nhandling in mm/ to cover PageReserved functionality.\n\nPageReserved special casing is removed from get_page and put_page.\n\nAll setting and clearing of PageReserved is retained, and it is now flagged\nin the page_alloc checks to help ensure we don\u0027t introduce any refcount\nbased freeing of Reserved pages.\n\nMAP_PRIVATE, PROT_WRITE of VM_RESERVED regions is tentatively being\ndeprecated. We never completely handled it correctly anyway, and is be\nreintroduced in future if required (Hugh has a proof of concept).\n\nOnce PageReserved() calls are removed from kernel/power/swsusp.c, and all\narch/ and driver code, the Set and Clear calls, and the PG_reserved bit can\nbe trivially removed.\n\nLast real user of PageReserved is swsusp, which uses PageReserved to\ndetermine whether a struct page points to valid memory or not. This still\nneeds to be addressed (a generic page_is_ram() should work).\n\nA last caveat: the ZERO_PAGE is now refcounted and managed with rmap (and\nthus mapcounted and count towards shared rss). These writes to the struct\npage could cause excessive cacheline bouncing on big systems. There are a\nnumber of ways this could be addressed if it is an issue.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\n\nRefcount bug fix for filemap_xip.c\n\nSigned-off-by: Carsten Otte \u003ccotte@de.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "ab50b8ed818016cfecd747d6d4bb9139986bc029", "tree": "33c666578c14dccce05b3f7a5538405098eebcc4", "parents": [ "72866f6f277ec0ddd6df7a3b6ecdcf59a28de115" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Sat Oct 29 18:15:56 2005 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Sat Oct 29 21:40:37 2005 -0700" }, "message": "[PATCH] mm: vm_stat_account unshackled\n\nThe original vm_stat_account has fallen into disuse, with only one user, and\nonly one user of vm_stat_unaccount. It\u0027s easier to keep track if we convert\nthem all to __vm_stat_account, then free it from its __shackles.\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": "7e2cff42cfac27c25202648c5c89f9171e5bc085", "tree": "5579fa13b1fc8081201f05d687e6dc795d9d648f", "parents": [ "7e871b6c8f1f4fda41e51ef86147facecac3be9f" ], "author": { "name": "Paolo \u0027Blaisorblade\u0027 Giarrusso", "email": "blaisorblade@yahoo.it", "time": "Wed Sep 21 09:55:39 2005 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Wed Sep 21 10:11:55 2005 -0700" }, "message": "[PATCH] mm: add a note about partially hardcoded VM_* flags\n\nHugh made me note this line for permission checking in mprotect():\n\n\t\tif ((newflags \u0026 ~(newflags \u003e\u003e 4)) \u0026 0xf) {\n\nafter figuring out what\u0027s that about, I decided it\u0027s nasty enough. Btw\nHugh itself didn\u0027t like the 0xf.\n\nWe can safely change it to VM_READ|VM_WRITE|VM_EXEC because we never change\nVM_SHARED, so no need to check that.\n\nSigned-off-by: Paolo \u0027Blaisorblade\u0027 Giarrusso \u003cblaisorblade@yahoo.it\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": "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" } ] }