- 26 7月, 2011 2 次提交
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由 Chris Forbes 提交于
Fix coding style issues flagged by checkpatch.pl Signed-off-by: NChris Forbes <chrisf@ijw.co.nz> Acked-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Becky Bruce 提交于
This is needed on HIGHMEM systems - we don't always have a virtual address so store the physical address and map it in as needed. [akpm@linux-foundation.org: cleanup] Signed-off-by: NBecky Bruce <beckyb@kernel.crashing.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 16 6月, 2011 1 次提交
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由 Rafael Aquini 提交于
When 1GB hugepages are allocated on a system, free(1) reports less available memory than what really is installed in the box. Also, if the total size of hugepages allocated on a system is over half of the total memory size, CommitLimit becomes a negative number. The problem is that gigantic hugepages (order > MAX_ORDER) can only be allocated at boot with bootmem, thus its frames are not accounted to 'totalram_pages'. However, they are accounted to hugetlb_total_pages() What happens to turn CommitLimit into a negative number is this calculation, in fs/proc/meminfo.c: allowed = ((totalram_pages - hugetlb_total_pages()) * sysctl_overcommit_ratio / 100) + total_swap_pages; A similar calculation occurs in __vm_enough_memory() in mm/mmap.c. Also, every vm statistic which depends on 'totalram_pages' will render confusing values, as if system were 'missing' some part of its memory. Impact of this bug: When gigantic hugepages are allocated and sysctl_overcommit_memory == OVERCOMMIT_NEVER. In a such situation, __vm_enough_memory() goes through the mentioned 'allowed' calculation and might end up mistakenly returning -ENOMEM, thus forcing the system to start reclaiming pages earlier than it would be ususal, and this could cause detrimental impact to overall system's performance, depending on the workload. Besides the aforementioned scenario, I can only think of this causing annoyances with memory reports from /proc/meminfo and free(1). [akpm@linux-foundation.org: standardize comment layout] Reported-by: NRuss Anderson <rja@sgi.com> Signed-off-by: NRafael Aquini <aquini@linux.com> Acked-by: NRuss Anderson <rja@sgi.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Christoph Lameter <cl@linux.com> Cc: <stable@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 06 6月, 2011 1 次提交
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由 Hugh Dickins 提交于
Al Viro observes that in the hugetlb case, handle_mm_fault() may return a value of the kind ENOSPC when its caller is expecting a value of the kind VM_FAULT_SIGBUS: fix alloc_huge_page()'s failure returns. Signed-off-by: NHugh Dickins <hughd@google.com> Acked-by: NAl Viro <viro@zeniv.linux.org.uk> Cc: stable@kernel.org Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 27 5月, 2011 1 次提交
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由 KOSAKI Motohiro 提交于
The type of vma->vm_flags is 'unsigned long'. Neither 'int' nor 'unsigned int'. This patch fixes such misuse. Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> [ Changed to use a typedef - we'll extend it to cover more cases later, since there has been discussion about making it a 64-bit type.. - Linus ] Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 25 5月, 2011 1 次提交
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由 Peter Zijlstra 提交于
Straightforward conversion of i_mmap_lock to a mutex. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: NHugh Dickins <hughd@google.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Miller <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Tony Luck <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 10 4月, 2011 1 次提交
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由 Justin P. Mattock 提交于
Signed-off-by: NJustin P. Mattock <justinmattock@gmail.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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- 31 3月, 2011 1 次提交
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由 Lucas De Marchi 提交于
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: NLucas De Marchi <lucas.demarchi@profusion.mobi>
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- 23 3月, 2011 1 次提交
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由 Petr Holasek 提交于
When the user inserts a negative value into /proc/sys/vm/nr_hugepages it will cause the kernel to allocate as many hugepages as possible and to then update /proc/meminfo to reflect this. This changes the behavior so that the negative input will result in nr_hugepages value being unchanged. Signed-off-by: NPetr Holasek <pholasek@redhat.com> Signed-off-by: NAnton Arapov <anton@redhat.com> Reviewed-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: NDavid Rientjes <rientjes@google.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Acked-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 14 1月, 2011 5 次提交
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由 Eric B Munson 提交于
When parsing changes to the huge page pool sizes made from userspace via the sysfs interface, bogus input values are being covered up by nr_hugepages_store_common and nr_overcommit_hugepages_store returning 0 when strict_strtoul returns an error. This can cause an infinite loop in the nr_hugepages_store code. This patch changes the return value for these functions to -EINVAL when strict_strtoul returns an error. Signed-off-by: NEric B Munson <emunson@mgebm.net> Reported-by: NCAI Qian <caiqian@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Eric B Munson <emunson@mgebm.net> Cc: Michal Hocko <mhocko@suse.cz> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Eric B Munson 提交于
Huge pages with order >= MAX_ORDER must be allocated at boot via the kernel command line, they cannot be allocated or freed once the kernel is up and running. Currently we allow values to be written to the sysfs and sysctl files controling pool size for these huge page sizes. This patch makes the store functions for nr_hugepages and nr_overcommit_hugepages return -EINVAL when the pool for a page size >= MAX_ORDER is changed. [akpm@linux-foundation.org: avoid multiple return paths in nr_hugepages_store_common()] [caiqian@redhat.com: add checking in hugetlb_overcommit_handler()] Signed-off-by: NEric B Munson <emunson@mgebm.net> Reported-by: NCAI Qian <caiqian@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Michal Hocko 提交于
proc_doulongvec_minmax may fail if the given buffer doesn't represent a valid number. If we provide something invalid we will initialize the resulting value (nr_overcommit_huge_pages in this case) to a random value from the stack. The issue was introduced by a3d0c6aa when the default handler has been replaced by the helper function where we do not check the return value. Reproducer: echo "" > /proc/sys/vm/nr_overcommit_hugepages [akpm@linux-foundation.org: correctly propagate proc_doulongvec_minmax return code] Signed-off-by: NMichal Hocko <mhocko@suse.cz> Cc: CAI Qian <caiqian@redhat.com> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Jesper Juhl 提交于
The NODEMASK_ALLOC macro may dynamically allocate memory for its second argument ('nodes_allowed' in this context). In nr_hugepages_store_common() we may abort early if strict_strtoul() fails, but in that case we do not free the memory already allocated to 'nodes_allowed', causing a memory leak. This patch closes the leak by freeing the memory in the error path. [akpm@linux-foundation.org: use NODEMASK_FREE, per Minchan Kim] Signed-off-by: NJesper Juhl <jj@chaosbits.net> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Andrea Arcangeli 提交于
Move the copy/clear_huge_page functions to common code to share between hugetlb.c and huge_memory.c. Signed-off-by: NAndrea Arcangeli <aarcange@redhat.com> Acked-by: NRik van Riel <riel@redhat.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 03 12月, 2010 1 次提交
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由 Dean Nelson 提交于
Have hugetlb_fault() call unlock_page(page) only if it had previously called lock_page(page). Setting CONFIG_DEBUG_VM=y and then running the libhugetlbfs test suite, resulted in the tripping of VM_BUG_ON(!PageLocked(page)) in unlock_page() having been called by hugetlb_fault() when page == pagecache_page. This patch remedied the problem. Signed-off-by: NDean Nelson <dnelson@redhat.com> Cc: <stable@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 27 10月, 2010 1 次提交
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由 Dean Nelson 提交于
Add missing spin_lock() of the page_table_lock before an error return in hugetlb_cow(). Callers of hugtelb_cow() expect it to be held upon return. Signed-off-by: NDean Nelson <dnelson@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: <stable@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 08 10月, 2010 9 次提交
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由 Andi Kleen 提交于
This fixes a problem introduced with the hugetlb hwpoison handling The user space SIGBUS signalling wants to know the size of the hugepage that caused a HWPOISON fault. Unfortunately the architecture page fault handlers do not have easy access to the struct page. Pass the information out in the fault error code instead. I added a separate VM_FAULT_HWPOISON_LARGE bit for this case and encode the hpage index in some free upper bits of the fault code. The small page hwpoison keeps stays with the VM_FAULT_HWPOISON name to minimize changes. Also add code to hugetlb.h to convert that index into a page shift. Will be used in a further patch. Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: fengguang.wu@intel.com Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Andi Kleen 提交于
Fixes warning reported by Stephen Rothwell mm/hugetlb.c:2950: warning: 'is_hugepage_on_freelist' defined but not used for the !CONFIG_MEMORY_FAILURE case. Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
Currently error recovery for free hugepage works only for MF_COUNT_INCREASED. This patch enables !MF_COUNT_INCREASED case. Free hugepages can be handled directly by alloc_huge_page() and dequeue_hwpoisoned_huge_page(), and both of them are protected by hugetlb_lock, so there is no race between them. Note that this patch defines the refcount of HWPoisoned hugepage dequeued from freelist is 1, deviated from present 0, thereby we can avoid race between unpoison and memory failure on free hugepage. This is reasonable because unlikely to free buddy pages, free hugepage is governed by hugetlbfs even after error handling finishes. And it also makes unpoison code added in the later patch cleaner. Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: NJun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
Currently alloc_huge_page() raises page refcount outside hugetlb_lock. but it causes race when dequeue_hwpoison_huge_page() runs concurrently with alloc_huge_page(). To avoid it, this patch moves set_page_refcounted() in hugetlb_lock. Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Reviewed-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
This check is necessary to avoid race between dequeue and allocation, which can cause a free hugepage to be dequeued twice and get kernel unstable. Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: NWu Fengguang <fengguang.wu@intel.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Reviewed-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
This patch extends page migration code to support hugepage migration. One of the potential users of this feature is soft offlining which is triggered by memory corrected errors (added by the next patch.) Todo: - there are other users of page migration such as memory policy, memory hotplug and memocy compaction. They are not ready for hugepage support for now. ChangeLog since v4: - define migrate_huge_pages() - remove changes on isolation/putback_lru_page() ChangeLog since v2: - refactor isolate/putback_lru_page() to handle hugepage - add comment about race on unmap_and_move_huge_page() ChangeLog since v1: - divide migration code path for hugepage - define routine checking migration swap entry for hugetlb - replace "goto" with "if/else" in remove_migration_pte() Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: NJun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
This patch modifies hugepage copy functions to have only destination and source hugepages as arguments for later use. The old ones are renamed from copy_{gigantic,huge}_page() to copy_user_{gigantic,huge}_page(). This naming convention is consistent with that between copy_highpage() and copy_user_highpage(). ChangeLog since v4: - add blank line between local declaration and code - remove unnecessary might_sleep() ChangeLog since v2: - change copy_huge_page() from macro to inline dummy function to avoid compile warning when !CONFIG_HUGETLB_PAGE. Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Reviewed-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
We can't use existing hugepage allocation functions to allocate hugepage for page migration, because page migration can happen asynchronously with the running processes and page migration users should call the allocation function with physical addresses (not virtual addresses) as arguments. ChangeLog since v3: - unify alloc_buddy_huge_page() and alloc_buddy_huge_page_node() ChangeLog since v2: - remove unnecessary get/put_mems_allowed() (thanks to David Rientjes) ChangeLog since v1: - add comment on top of alloc_huge_page_no_vma() Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Signed-off-by: NJun'ichi Nomura <j-nomura@ce.jp.nec.com> Reviewed-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
Since the PageHWPoison() check is for avoiding hwpoisoned page remained in pagecache mapping to the process, it should be done in "found in pagecache" branch, not in the common path. Otherwise, metadata corruption occurs if memory failure happens between alloc_huge_page() and lock_page() because page fault fails with metadata changes remained (such as refcount, mapcount, etc.) This patch moves the check to "found in pagecache" branch and fix the problem. ChangeLog since v2: - remove retry check in "new allocation" path. - make description more detailed - change patch name from "HWPOISON, hugetlb: move PG_HWPoison bit check" Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: NJun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Reviewed-by: NWu Fengguang <fengguang.wu@intel.com> Reviewed-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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- 24 9月, 2010 2 次提交
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由 Naoya Horiguchi 提交于
The "if (!trylock_page)" block in the avoidcopy path of hugetlb_cow() looks confusing and is buggy. Originally this trylock_page() was intended to make sure that old_page is locked even when old_page != pagecache_page, because then only pagecache_page is locked. This patch fixes it by moving page locking into hugetlb_fault(). Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: NRik van Riel <riel@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Naoya Horiguchi 提交于
Obviously, setting anon_vma for COWed hugepage should be done by hugepage_add_new_anon_rmap() to scan vmas faster. This patch fixes it. Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: NAndrea Arcangeli <aarcange@redhat.com> Reviewed-by: NRik van Riel <riel@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 11 8月, 2010 5 次提交
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由 Naoya Horiguchi 提交于
This patch fixes possible deadlock in hugepage lock_page() by adding missing unlock_page(). libhugetlbfs test will hit this bug when the next patch in this patchset ("hugetlb, HWPOISON: move PG_HWPoison bit check") is applied. Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: NJun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: NFengguang Wu <fengguang.wu@intel.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
This patch enables hwpoison injection through debug/hwpoison interfaces, with which we can test memory error handling for free or reserved hugepages (which cannot be tested by madvise() injector). [AK: Export PageHuge too for the injection module] Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Acked-by: NFengguang Wu <fengguang.wu@intel.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
This patch enables to block access to hwpoisoned hugepage and also enables to block unmapping for it. Dependency: "HWPOISON, hugetlb: enable error handling path for hugepage" Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Acked-by: NFengguang Wu <fengguang.wu@intel.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
If error hugepage is not in-use, we can fully recovery from error by dequeuing it from freelist, so return RECOVERY. Otherwise whether or not we can recovery depends on user processes, so return DELAYED. Dependency: "HWPOISON, hugetlb: enable error handling path for hugepage" Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Acked-by: NFengguang Wu <fengguang.wu@intel.com> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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由 Naoya Horiguchi 提交于
This patch adds reverse mapping feature for hugepage by introducing mapcount for shared/private-mapped hugepage and anon_vma for private-mapped hugepage. While hugepage is not currently swappable, reverse mapping can be useful for memory error handler. Without this patch, memory error handler cannot identify processes using the bad hugepage nor unmap it from them. That is: - for shared hugepage: we can collect processes using a hugepage through pagecache, but can not unmap the hugepage because of the lack of mapcount. - for privately mapped hugepage: we can neither collect processes nor unmap the hugepage. This patch solves these problems. This patch include the bug fix given by commit 23be7468, so reverts it. Dependency: "hugetlb: move definition of is_vm_hugetlb_page() to hugepage_inline.h" ChangeLog since May 24. - create hugetlb_inline.h and move is_vm_hugetlb_index() in it. - move functions setting up anon_vma for hugepage into mm/rmap.c. ChangeLog since May 13. - rebased to 2.6.34 - fix logic error (in case that private mapping and shared mapping coexist) - move is_vm_hugetlb_page() into include/linux/mm.h to use this function from linear_page_index() - define and use linear_hugepage_index() instead of compound_order() - use page_move_anon_rmap() in hugetlb_cow() - copy exclusive switch of __set_page_anon_rmap() into hugepage counterpart. - revert commit 24be7468 completely Signed-off-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Larry Woodman <lwoodman@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Acked-by: NFengguang Wu <fengguang.wu@intel.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Signed-off-by: NAndi Kleen <ak@linux.intel.com>
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- 10 8月, 2010 1 次提交
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由 Doug Doan 提交于
When a copy-on-write occurs, we take one of two paths in handle_mm_fault: through handle_pte_fault for normal pages, or through hugetlb_fault for huge pages. In the normal page case, we eventually get to do_wp_page and call mmu notifiers via ptep_clear_flush_notify. There is no callout to the mmmu notifiers in the huge page case. This patch fixes that. Signed-off-by: NDoug Doan <dougd@cray.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 25 5月, 2010 1 次提交
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由 Miao Xie 提交于
Before applying this patch, cpuset updates task->mems_allowed and mempolicy by setting all new bits in the nodemask first, and clearing all old unallowed bits later. But in the way, the allocator may find that there is no node to alloc memory. The reason is that cpuset rebinds the task's mempolicy, it cleans the nodes which the allocater can alloc pages on, for example: (mpol: mempolicy) task1 task1's mpol task2 alloc page 1 alloc on node0? NO 1 1 change mems from 1 to 0 1 rebind task1's mpol 0-1 set new bits 0 clear disallowed bits alloc on node1? NO 0 ... can't alloc page goto oom This patch fixes this problem by expanding the nodes range first(set newly allowed bits) and shrink it lazily(clear newly disallowed bits). So we use a variable to tell the write-side task that read-side task is reading nodemask, and the write-side task clears newly disallowed nodes after read-side task ends the current memory allocation. [akpm@linux-foundation.org: fix spello] Signed-off-by: NMiao Xie <miaox@cn.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Paul Menage <menage@google.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Ravikiran Thirumalai <kiran@scalex86.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 12 5月, 2010 1 次提交
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由 Mel Gorman 提交于
Ordinarily, application using hugetlbfs will create mappings with reserves. For shared mappings, these pages are reserved before mmap() returns success and for private mappings, the caller process is guaranteed and a child process that cannot get the pages gets killed with sigbus. An application that uses MAP_NORESERVE gets no reservations and mmap() will always succeed at the risk the page will not be available at fault time. This might be used for example on very large sparse mappings where the developer is confident the necessary huge pages exist to satisfy all faults even though the whole mapping cannot be backed by huge pages. Unfortunately, if an allocation does fail, VM_FAULT_OOM is returned to the fault handler which proceeds to trigger the OOM-killer. This is unhelpful. Even without hugetlbfs mounted, a user using mmap() can trivially trigger the OOM-killer because VM_FAULT_OOM is returned (will provide example program if desired - it's a whopping 24 lines long). It could be considered a DOS available to an unprivileged user. This patch alters hugetlbfs to kill a process that uses MAP_NORESERVE where huge pages were not available with SIGBUS instead of triggering the OOM killer. This change affects hugetlb_cow() as well. I feel there is a failure case in there, but I didn't create one. It would need a fairly specific target in terms of the faulting application and the hugepage pool size. The hugetlb_no_page() path is much easier to hit but both might as well be closed. Signed-off-by: NMel Gorman <mel@csn.ul.ie> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: David Rientjes <rientjes@google.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: <stable@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 25 4月, 2010 1 次提交
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由 Mel Gorman 提交于
If a futex key happens to be located within a huge page mapped MAP_PRIVATE, get_futex_key() can go into an infinite loop waiting for a page->mapping that will never exist. See https://bugzilla.redhat.com/show_bug.cgi?id=552257 for more details about the problem. This patch makes page->mapping a poisoned value that includes PAGE_MAPPING_ANON mapped MAP_PRIVATE. This is enough for futex to continue but because of PAGE_MAPPING_ANON, the poisoned value is not dereferenced or used by futex. No other part of the VM should be dereferencing the page->mapping of a hugetlbfs page as its page cache is not on the LRU. This patch fixes the problem with the test case described in the bugzilla. [akpm@linux-foundation.org: mel cant spel] Signed-off-by: NMel Gorman <mel@csn.ul.ie> Acked-by: NPeter Zijlstra <peterz@infradead.org> Acked-by: NDarren Hart <darren@dvhart.com> Cc: <stable@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 30 3月, 2010 1 次提交
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由 Tejun Heo 提交于
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: NTejun Heo <tj@kernel.org> Guess-its-ok-by: NChristoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
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- 21 2月, 2010 1 次提交
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由 Russell King 提交于
On VIVT ARM, when we have multiple shared mappings of the same file in the same MM, we need to ensure that we have coherency across all copies. We do this via make_coherent() by making the pages uncacheable. This used to work fine, until we allowed highmem with highpte - we now have a page table which is mapped as required, and is not available for modification via update_mmu_cache(). Ralf Beache suggested getting rid of the PTE value passed to update_mmu_cache(): On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables to construct a pointer to the pte again. Passing a pte_t * is much more elegant. Maybe we might even replace the pte argument with the pte_t? Ben Herrenschmidt would also like the pte pointer for PowerPC: Passing the ptep in there is exactly what I want. I want that -instead- of the PTE value, because I have issue on some ppc cases, for I$/D$ coherency, where set_pte_at() may decide to mask out the _PAGE_EXEC. So, pass in the mapped page table pointer into update_mmu_cache(), and remove the PTE value, updating all implementations and call sites to suit. Includes a fix from Stephen Rothwell: sparc: fix fallout from update_mmu_cache API change Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 03 2月, 2010 1 次提交
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由 Jeff Mahoney 提交于
hugetlb_sysfs_add_hstate is called by hugetlb_register_node directly during init and also indirectly via sysfs after init. This patch removes the __init tag from hugetlb_sysfs_add_hstate. Signed-off-by: NJeff Mahoney <jeffm@suse.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 12 1月, 2010 1 次提交
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由 Andrea Arcangeli 提交于
sz is in bytes, MAX_ORDER_NR_PAGES is in pages. Signed-off-by: NAndrea Arcangeli <aarcange@redhat.com> Acked-by: NDavid Gibson <dwg@au1.ibm.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: David Rientjes <rientjes@google.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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