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* mm, oom: do not schedule if current has been killedDavid Rientjes2012-07-311-6/+5
| | | | | | | | | | | | | | | | | | | | | | | The oom killer currently schedules away from current in an uninterruptible sleep if it does not have access to memory reserves. It's possible that current was killed because it shares memory with the oom killed thread or because it was killed by the user in the interim, however. This patch only schedules away from current if it does not have a pending kill, i.e. if it does not share memory with the oom killed thread. It's possible that it will immediately retry its memory allocation and fail, but it will immediately be given access to memory reserves if it calls the oom killer again. This prevents the delay of memory freeing when threads that share memory with the oom killed thread get unnecessarily scheduled. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Oleg Nesterov <oleg@redhat.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: remove exclude and wakeup rmdir calls from migrateAneesh Kumar K.V2012-07-311-2/+4
| | | | | | | | | | | We already hold the hugetlb_lock. That should prevent a parallel cgroup rmdir from touching page's hugetlb cgroup. So remove the exclude and wakeup calls. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: assign the page hugetlb cgroup when we move the page to ↵Aneesh Kumar K.V2012-07-312-14/+13
| | | | | | | | | | | | | | active list. A page's hugetlb cgroup assignment and movement to the active list should occur with hugetlb_lock held. Otherwise when we remove the hugetlb cgroup we will iterate the active list and find pages with NULL hugetlb cgroup values. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: move all the in use pages to active listAneesh Kumar K.V2012-07-311-1/+10
| | | | | | | | | | | | When we fail to allocate pages from the reserve pool, hugetlb tries to allocate huge pages using alloc_buddy_huge_page. Add these to the active list. We also need to add the huge page we allocate when we soft offline the oldpage to active list. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: add HugeTLB controller documentationAneesh Kumar K.V2012-07-311-0/+45
| | | | | | | | | | | Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: migrate hugetlb cgroup info from oldpage to new page during ↵Aneesh Kumar K.V2012-07-313-0/+33
| | | | | | | | | | | | | | | | | migration With HugeTLB pages, hugetlb cgroup is uncharged in compound page destructor. Since we are holding a hugepage reference, we can be sure that old page won't get uncharged till the last put_page(). Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: add hugetlb cgroup control filesAneesh Kumar K.V2012-07-314-0/+148
| | | | | | | | | | | | | | | Add the control files for hugetlb controller [akpm@linux-foundation.org: s/CONFIG_CGROUP_HUGETLB_RES_CTLR/CONFIG_MEMCG_HUGETLB/g] [akpm@linux-foundation.org: s/CONFIG_MEMCG_HUGETLB/CONFIG_CGROUP_HUGETLB/] Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: add support for cgroup removalAneesh Kumar K.V2012-07-311-2/+68
| | | | | | | | | | | | | | Add support for cgroup removal. If we don't have parent cgroup, the charges are moved to root cgroup. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: add charge/uncharge routines for hugetlb cgroupAneesh Kumar K.V2012-07-313-1/+133
| | | | | | | | | | | | | | | | | | Add the charge and uncharge routines for hugetlb cgroup. We do cgroup charging in page alloc and uncharge in compound page destructor. Assigning page's hugetlb cgroup is protected by hugetlb_lock. [liwp@linux.vnet.ibm.com: add huge_page_order check to avoid incorrect uncharge] Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Wanpeng Li <liwp.linux@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb/cgroup: add the cgroup pointer to page lruAneesh Kumar K.V2012-07-312-0/+41
| | | | | | | | | | | | | | | Add the hugetlb cgroup pointer to 3rd page lru.next. This limit the usage to hugetlb cgroup to only hugepages with 3 or more normal pages. I guess that is an acceptable limitation. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm/hugetlb: add new HugeTLB cgroupAneesh Kumar K.V2012-07-315-0/+179
| | | | | | | | | | | | | | | | | | | | | | | | Implement a new controller that allows us to control HugeTLB allocations. The extension allows to limit the HugeTLB usage per control group and enforces the controller limit during page fault. Since HugeTLB doesn't support page reclaim, enforcing the limit at page fault time implies that, the application will get SIGBUS signal if it tries to access HugeTLB pages beyond its limit. This requires the application to know beforehand how much HugeTLB pages it would require for its use. The charge/uncharge calls will be added to HugeTLB code in later patch. Support for cgroup removal will be added in later patches. [akpm@linux-foundation.org: s/CONFIG_CGROUP_HUGETLB_RES_CTLR/CONFIG_MEMCG_HUGETLB/g] [akpm@linux-foundation.org: s/CONFIG_MEMCG_HUGETLB/CONFIG_CGROUP_HUGETLB/g] Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: make some static variables globalAneesh Kumar K.V2012-07-312-5/+7
| | | | | | | | | | | | | We will use them later in hugetlb_cgroup.c Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: add a list for tracking in-use HugeTLB pagesAneesh Kumar K.V2012-07-312-5/+8
| | | | | | | | | | | | | | | | hugepage_activelist will be used to track currently used HugeTLB pages. We need to find the in-use HugeTLB pages to support HugeTLB cgroup removal. On cgroup removal we update the page's HugeTLB cgroup to point to parent cgroup. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: simplify migrate_huge_page()Aneesh Kumar K.V2012-07-313-57/+27
| | | | | | | | | | | | | | | Since we migrate only one hugepage, don't use linked list for passing the page around. Directly pass the page that need to be migrated as argument. This also removes the usage of page->lru in the migrate path. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: use mmu_gather instead of a temporary linked list for accumulating ↵Aneesh Kumar K.V2012-07-314-33/+59
| | | | | | | | | | | | | | | | pages Use a mmu_gather instead of a temporary linked list for accumulating pages when we unmap a hugepage range Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: add an inline helper for finding hstate indexAneesh Kumar K.V2012-07-312-9/+17
| | | | | | | | | | | | | Add an inline helper and use it in the code. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: Michal Hocko <mhocko@suse.cz> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: don't use ERR_PTR with VM_FAULT* valuesAneesh Kumar K.V2012-07-311-5/+13
| | | | | | | | | | | | | | | The current use of VM_FAULT_* codes with ERR_PTR requires us to ensure VM_FAULT_* values will not exceed MAX_ERRNO value. Decouple the VM_FAULT_* values from MAX_ERRNO. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Hillf Danton <dhillf@gmail.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hugetlb: rename max_hstate to hugetlb_max_hstateAneesh Kumar K.V2012-07-311-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patchset implements a cgroup resource controller for HugeTLB pages. The controller allows to limit the HugeTLB usage per control group and enforces the controller limit during page fault. Since HugeTLB doesn't support page reclaim, enforcing the limit at page fault time implies that, the application will get SIGBUS signal if it tries to access HugeTLB pages beyond its limit. This requires the application to know beforehand how much HugeTLB pages it would require for its use. The goal is to control how many HugeTLB pages a group of task can allocate. It can be looked at as an extension of the existing quota interface which limits the number of HugeTLB pages per hugetlbfs superblock. HPC job scheduler requires jobs to specify their resource requirements in the job file. Once their requirements can be met, job schedulers like (SLURM) will schedule the job. We need to make sure that the jobs won't consume more resources than requested. If they do we should either error out or kill the application. This patch: Rename max_hstate to hugetlb_max_hstate. We will be using this from other subsystems like hugetlb controller in later patches. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Hillf Danton <dhillf@gmail.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threadsWanpeng Li2012-07-319-27/+40
| | | | | | | | | | | | | | Since per-BDI flusher threads were introduced in 2.6, the pdflush mechanism is not used any more. But the old interface exported through /proc/sys/vm/nr_pdflush_threads still exists and is obviously useless. For back-compatibility, printk warning information and return 2 to notify the users that the interface is removed. Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm/buddy: cleanup on should_fail_alloc_pageGavin Shan2012-07-311-7/+7
| | | | | | | | | | | | | | Currently, function should_fail() has "bool" for its return value, so it's reasonable to change the return value of function should_fail_alloc_page() into "bool" as well. The patch does cleanup on function should_fail_alloc_page() to have "bool" for its return value. Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: account the total_vm in the vm_stat_account()Huang Shijie2012-07-315-9/+4
| | | | | | | | | | | | vm_stat_account() accounts the shared_vm, stack_vm and reserved_vm now. But we can also account for total_vm in the vm_stat_account() which makes the code tidy. Even for mprotect_fixup(), we can get the right result in the end. Signed-off-by: Huang Shijie <shijie8@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* documentation: update how page-cluster affects swap I/OChristian Ehrhardt2012-07-311-2/+10
| | | | | | | | | | | | | Fix of the documentation of /proc/sys/vm/page-cluster to match the behavior of the code and add some comments about what the tunable will change in that behavior. Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Acked-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Minchan Kim <minchan@kernel.org> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* swap: allow swap readahead to be mergedChristian Ehrhardt2012-07-311-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Swap readahead works fine, but the I/O to disk is almost always done in page size requests, despite the fact that readahead submits 1<<page-cluster pages at a time. On older kernels the old per device plugging behavior might have captured this and merged the requests, but currently all comes down to much more I/Os than required. On a single device this might not be an issue, but as soon as a server runs on shared san resources savin I/Os not only improves swapin throughput but also provides a lower resource utilization. With a load running KVM in a lot of memory overcommitment (the hot memory is 1.5 times the host memory) swapping throughput improves significantly and the lead feels more responsive as well as achieves more throughput. In a test setup with 16 swap disks running blocktrace on one of those disks shows the improved merging: Prior: Reads Queued: 560,888, 2,243MiB Writes Queued: 226,242, 904,968KiB Read Dispatches: 544,701, 2,243MiB Write Dispatches: 159,318, 904,968KiB Reads Requeued: 0 Writes Requeued: 0 Reads Completed: 544,716, 2,243MiB Writes Completed: 159,321, 904,980KiB Read Merges: 16,187, 64,748KiB Write Merges: 61,744, 246,976KiB IO unplugs: 149,614 Timer unplugs: 2,940 With the patch: Reads Queued: 734,315, 2,937MiB Writes Queued: 300,188, 1,200MiB Read Dispatches: 214,972, 2,937MiB Write Dispatches: 215,176, 1,200MiB Reads Requeued: 0 Writes Requeued: 0 Reads Completed: 214,971, 2,937MiB Writes Completed: 215,177, 1,200MiB Read Merges: 519,343, 2,077MiB Write Merges: 73,325, 293,300KiB IO unplugs: 337,130 Timer unplugs: 11,184 I got ~10% to ~40% more throughput in my cases and at the same time much lower cpu consumption when broken down per transferred kilobyte (the majority of that due to saved interrupts and better cache handling). In a shared SAN others might get an additional benefit as well, because this now causes less protocol overhead. Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Minchan Kim <minchan@kernel.org> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* memcg: remove MEM_CGROUP_CHARGE_TYPE_FORCEKamezawa Hiroyuki2012-07-311-1/+0
| | | | | | | | | | There are no users since commit b24028572fb69 ("memcg: remove PCG_CACHE"). Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Hugh Dickins <hughd@google.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* memcg: rename MEM_CGROUP_CHARGE_TYPE_MAPPED as MEM_CGROUP_CHARGE_TYPE_ANONKamezawa Hiroyuki2012-07-311-8/+8
| | | | | | | | | | | | | | | Now, in memcg, 2 "MAPPED" enum/macro are found MEM_CGROUP_CHARGE_TYPE_MAPPED MEM_CGROUP_STAT_FILE_MAPPED Thier names looks similar to each other but the former is used for accounting anonymous memory. rename it as TYPE_ANON. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* memcg: rename MEM_CGROUP_STAT_SWAPOUT as MEM_CGROUP_STAT_SWAPKamezawa Hiroyuki2012-07-311-5/+5
| | | | | | | | | | | | MEM_CGROUP_STAT_SWAPOUT represents the usage of swap rather than the number of swap-out events. Rename it to be MEM_CGROUP_STAT_SWAP. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Hugh Dickins <hughd@google.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: make vb_alloc() more foolproofJan Kara2012-07-311-0/+8
| | | | | | | | | | | | If someone calls vb_alloc() (or vm_map_ram() for that matter) to allocate 0 bytes (0 pages), get_order() returns BITS_PER_LONG - PAGE_CACHE_SHIFT and interesting stuff happens. So make debugging such problems easier and warn about 0-size allocation. [akpm@linux-foundation.org: use WARN_ON-return-value feature] Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* vmalloc: walk vmap_areas by sorted list instead of rb_next()Hong zhi guo2012-07-311-4/+4
| | | | | | | | | | | | | | | | | | | | There's a walk by repeating rb_next to find a suitable hole. Could be simply replaced by walk on the sorted vmap_area_list. More simpler and efficient. Mutation of the list and tree only happens in pair within __insert_vmap_area and __free_vmap_area, under protection of vmap_area_lock. The patch code is also under vmap_area_lock, so the list walk is safe, and consistent with the tree walk. Tested on SMP by repeating batch of vmalloc anf vfree for random sizes and rounds for hours. Signed-off-by: Hong Zhiguo <honkiko@gmail.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/media/video/v4l2-ioctl.c: fix buildAndrew Morton2012-07-311-2/+6
| | | | | | | | | | | | | | | Fix zillions of these: drivers/media/video/v4l2-ioctl.c:1848: error: unknown field 'func' specified in initializer drivers/media/video/v4l2-ioctl.c:1848: warning: missing braces around initializer drivers/media/video/v4l2-ioctl.c:1848: warning: (near initialization for 'v4l2_ioctls[0].<anonymous>') drivers/media/video/v4l2-ioctl.c:1848: warning: initialization makes integer from pointer without a cast drivers/media/video/v4l2-ioctl.c:1848: error: initializer element is not computable at load time drivers/media/video/v4l2-ioctl.c:1848: error: (near initialization for 'v4l2_ioctls[0].<anonymous>.offset') Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xtensa: select generic atomic64_t supportFengguang Wu2012-07-311-0/+1
| | | | | | | | | | | | This will fix build errors: block/blk-cgroup.c:609:2: error: unknown type name 'atomic64_t' block/blk-cgroup.c:609:2: error: implicit declaration of function 'ATOMIC64_INIT' [-Werror=implicit-function-declaration] Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fault-injection: fix failcmd.sh warningAkinobu Mita2012-07-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | "fault-injection: add tool to run command with failslab or fail_page_alloc" added tools/testing/fault-injection/failcmd.sh to make it easier to inject slab/page allocation failures by fault injection. failcmd.sh prints the following warning when running with arguments for command. # ./failcmd.sh echo aaa failcmd.sh: line 209: [: echo: binary operator expected aaa This warning is caused by an improper check whether at least one parameter is left after parsing command options. Fix it by testing the length of $1 instead of $@ Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge tag 'writeback-proportions' of ↵Linus Torvalds2012-07-308-50/+448
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux Pull writeback updates from Wu Fengguang: "Use time based periods to age the writeback proportions, which can adapt equally well to fast/slow devices." Fix up trivial conflict in comment in fs/sync.c * tag 'writeback-proportions' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: writeback: Fix some comment errors block: Convert BDI proportion calculations to flexible proportions lib: Fix possible deadlock in flexible proportion code lib: Proportions with flexible period
| * writeback: Fix some comment errorsWanpeng Li2012-06-094-6/+6
| | | | | | | | | | Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
| * block: Convert BDI proportion calculations to flexible proportionsJan Kara2012-06-093-44/+69
| | | | | | | | | | | | | | | | | | | | | | Convert calculations of proportion of writeback each bdi does to new flexible proportion code. That allows us to use aging period of fixed wallclock time which gives better proportion estimates given the hugely varying throughput of different devices. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
| * lib: Fix possible deadlock in flexible proportion codeJan Kara2012-06-091-2/+8
| | | | | | | | | | | | | | | | | | | | When percpu counter function in fprop_new_period() is interrupted by an interrupt while holding counter lock, it can cause deadlock when the interrupt wants to take the lock as well. Fix the problem by disabling interrupts when calling percpu counter functions. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
| * lib: Proportions with flexible periodJan Kara2012-06-093-1/+368
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement code computing proportions of events of different type (like code in lib/proportions.c) but allowing periods to have different lengths. This allows us to have aging periods of fixed wallclock time which gives better proportion estimates given the hugely varying throughput of different devices - previous measuring of aging period by number of events has the problem that a reasonable period length for a system with low-end USB stick is not a reasonable period length for a system with high-end storage array resulting either in too slow proportion updates or too fluctuating proportion updates. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
* | Merge tag 'nfs-for-3.6-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfsLinus Torvalds2012-07-3045-1825/+2220
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull NFS client updates from Trond Myklebust: "Features include: - More preparatory patches for modularising NFSv2/v3/v4. Split out the various NFSv2/v3/v4-specific code into separate files - More preparation for the NFSv4 migration code - Ensure that OPEN(O_CREATE) observes the pNFS mds threshold parameters - pNFS fast failover when the data servers are down - Various cleanups and debugging patches" * tag 'nfs-for-3.6-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (67 commits) nfs: fix fl_type tests in NFSv4 code NFS: fix pnfs regression with directio writes NFS: fix pnfs regression with directio reads sunrpc: clnt: Add missing braces nfs: fix stub return type warnings NFS: exit_nfs_v4() shouldn't be an __exit function SUNRPC: Add a missing spin_unlock to gss_mech_list_pseudoflavors NFS: Split out NFS v4 client functions NFS: Split out the NFS v4 filesystem types NFS: Create a single nfs_clone_super() function NFS: Split out NFS v4 server creating code NFS: Initialize the NFS v4 client from init_nfs_v4() NFS: Move the v4 getroot code to nfs4getroot.c NFS: Split out NFS v4 file operations NFS: Initialize v4 sysctls from nfs_init_v4() NFS: Create an init_nfs_v4() function NFS: Split out NFS v4 inode operations NFS: Split out NFS v3 inode operations NFS: Split out NFS v2 inode operations NFS: Clean up nfs4_proc_setclientid() and friends ...
| * | nfs: fix fl_type tests in NFSv4 codeJeff Layton2012-07-302-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | fl_type is not a bitmap. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: fix pnfs regression with directio writesFred Isaman2012-07-301-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 57208fa7e51 "NFS: Create an write_pageio_init() function" did not modify the calls in direct.c, preventing direct io from using pnfs. This reintroduces that capability. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: fix pnfs regression with directio readsFred Isaman2012-07-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 1abb50886af "NFS: Create an read_pageio_init() function" did not modify the call in direct.c, preventing direct io from using pnfs. This reintroduces that capability. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | sunrpc: clnt: Add missing bracesJoe Perches2012-07-301-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a missing set of braces that commit 4e0038b6b24 ("SUNRPC: Move clnt->cl_server into struct rpc_xprt") forgot. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@vger.kernel.org [>= 3.4]
| * | nfs: fix stub return type warningsRandy Dunlap2012-07-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix numerous repeated warnings by making the stub function void instead of non-void: fs/nfs/nfs4_fs.h: In function 'nfs4_unregister_sysctl': fs/nfs/nfs4_fs.h:385:1: warning: no return statement in function returning non-void Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: exit_nfs_v4() shouldn't be an __exit functionBryan Schumaker2012-07-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | ... yet. Right now, init_nfs() is calling this function if an error is encountered when loading the nfs module. An __exit function can't be called from one declared as __init. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | SUNRPC: Add a missing spin_unlock to gss_mech_list_pseudoflavorsTrond Myklebust2012-07-171-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | The patch "SUNRPC: Add rpcauth_list_flavors()" introduces a new error path in gss_mech_list_pseudoflavors, but fails to release the spin lock. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: Split out NFS v4 client functionsBryan Schumaker2012-07-172-93/+91
| | | | | | | | | | | | | | | | | | | | | | | | These functions are only needed by NFS v4, so they can be moved into a v4 specific file. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: Split out the NFS v4 filesystem typesBryan Schumaker2012-07-174-373/+381
| | | | | | | | | | | | | | | | | | | | | | | | | | | This allows me to move the v4 mounting and unmounting functions out of the generic client and into a file that is only compiled when CONFIG_NFS_V4 is enabled. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: Create a single nfs_clone_super() functionBryan Schumaker2012-07-171-26/+6
| | | | | | | | | | | | | | | | | | | | | | | | v2 and v3 shared a function for this, but v4 implemented something only slightly different. Might as well share code whenever possible... Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: Split out NFS v4 server creating codeBryan Schumaker2012-07-173-448/+462
| | | | | | | | | | | | | | | | | | | | | | | | These functions are specific to NFS v4 and can be moved to nfs4client.c to keep them out of the generic client. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: Initialize the NFS v4 client from init_nfs_v4()Bryan Schumaker2012-07-174-135/+149
| | | | | | | | | | | | | | | | | | | | | | | | And split these functions out of the generic client into a v4 specific file. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| * | NFS: Move the v4 getroot code to nfs4getroot.cBryan Schumaker2012-07-173-51/+50
| | | | | | | | | | | | | | | Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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