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Oleg Drokin 18aba41cbf mm/fadvise.c: do not discard partial pages with POSIX_FADV_DONTNEED 
I noticed that the logic in the fadvise64_64 syscall is incorrect for
partial pages.  While first page of the region is correctly skipped if
it is partial, the last page of the region is mistakenly discarded.
This leads to problems for applications that read data in
non-page-aligned chunks discarding already processed data between the
reads.

A somewhat misguided application that does something like write(XX bytes
(non-page-alligned)); drop the data it just wrote; repeat gets a
significant penalty in performance as a result.

Link: http://lkml.kernel.org/r/1464917140-1506698-1-git-send-email-green@linuxhacker.ru
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-06-09 14:23:11 -07:00
..
kasan
kasan: change memory hot-add error messages to info messages
2016-06-09 14:23:11 -07:00
backing-dev.c
mm: throttle on IO only when there are too many dirty and writeback pages
2016-05-20 17:58:30 -07:00
balloon_compaction.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2016-03-17 21:38:27 -07:00
bootmem.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
cleancache.c
cleancache: constify cleancache_ops structure
2016-01-27 09:09:57 -05:00
cma_debug.c
mm/cma_debug: correct size input to bitmap function
2015-07-17 16:39:54 -07:00
cma.c
mm/cma: silence warnings due to max() usage
2016-05-27 14:49:37 -07:00
cma.h
mm: cma: mark cma_bitmap_maxno() inline in header
2015-08-14 15:56:32 -07:00
compaction.c
mm/compaction.c: fix zoneindex in kcompactd()
2016-05-20 17:58:30 -07:00
debug_page_ref.c
mm/page_ref: add tracepoint to track down page reference manipulation
2016-03-17 15:09:34 -07:00
debug.c
mm: introduce page reference manipulation functions
2016-03-17 15:09:34 -07:00
dmapool.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
early_ioremap.c
mm/early_ioremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
fadvise.c
mm/fadvise.c: do not discard partial pages with POSIX_FADV_DONTNEED
2016-06-09 14:23:11 -07:00
failslab.c
mm: fault-inject take over bootstrap kmem_cache check
2016-03-15 16:55:16 -07:00
filemap.c
Filesystem DAX locking for 4.7
2016-05-26 20:00:28 -07:00
frame_vector.c
mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm
2016-02-16 10:11:12 +01:00
frontswap.c
frontswap: allow multiple backends
2015-06-24 17:49:45 -07:00
gup.c
Merge branch 'mm-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-04-14 19:31:34 -07:00
highmem.c
mm/highmem: make nr_free_highpages() handles all highmem zones by itself
2016-05-19 19:12:14 -07:00
huge_memory.c
libnvdimm for 4.7
2016-05-23 11:18:01 -07:00
hugetlb_cgroup.c
mm, hugetlb_cgroup: round limit_in_bytes down to hugepage size
2016-05-20 17:58:30 -07:00
hugetlb.c
mm/hugetlb: fix huge page reserve accounting for private mappings
2016-06-09 14:23:11 -07:00
hwpoison-inject.c
hwpoison: use page_cgroup_ino for filtering by memcg
2015-09-10 13:29:01 -07:00
init-mm.c
…
internal.h
mm: make vm_mmap killable
2016-05-23 17:04:14 -07:00
interval_tree.c
…
Kconfig
mm: disable DEFERRED_STRUCT_PAGE_INIT on !NO_BOOTMEM
2016-05-27 14:49:37 -07:00
Kconfig.debug
mm/page_ref: add tracepoint to track down page reference manipulation
2016-03-17 15:09:34 -07:00
kmemcheck.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak-test.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak.c
mm: coalesce split strings
2016-03-17 15:09:34 -07:00
ksm.c
ksm: fix conflict between mmput and scan_get_next_rmap_item
2016-05-12 15:52:50 -07:00
list_lru.c
mm: memcontrol: move kmem accounting code to CONFIG_MEMCG
2016-01-20 17:09:18 -08:00
maccess.c
x86: remove more uaccess_32.h complexity
2016-05-22 17:21:27 -07:00
madvise.c
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
Makefile
z3fold: the 3-fold allocator for compressed pages
2016-05-20 17:58:30 -07:00
memblock.c
mm/memblock.c: remove unnecessary always-true comparison
2016-05-20 17:58:30 -07:00
memcontrol.c
revert "mm: memcontrol: fix possible css ref leak on oom"
2016-06-09 14:23:11 -07:00
memory_hotplug.c
mm: fix section mismatch warning
2016-05-27 15:23:32 -07:00
memory-failure.c
mm/memory-failure.c: replace "MCE" with "Memory failure"
2016-05-20 17:58:30 -07:00
memory.c
Filesystem DAX locking for 4.7
2016-05-26 20:00:28 -07:00
mempolicy.c
mm, page_alloc: avoid looking up the first zone in a zonelist twice
2016-05-19 19:12:14 -07:00
mempool.c
mm: kasan: initial memory quarantine implementation
2016-05-20 17:58:30 -07:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
mm, migrate: increment fail count on ENOMEM
2016-05-20 17:58:30 -07:00
mincore.c
mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage
2016-04-04 10:41:08 -07:00
mlock.c
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
mm_init.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mmap.c
mm: remove more IS_ERR_VALUE abuses
2016-05-27 15:57:31 -07:00
mmu_context.c
mm/mmu_context, sched/core: Fix mmu_context.h assumption
2016-04-28 11:44:19 +02:00
mmu_notifier.c
fix Christoph's email addresses
2016-03-17 15:09:34 -07:00
mmzone.c
mm, page_alloc: inline the fast path of the zonelist iterator
2016-05-19 19:12:14 -07:00
mprotect.c
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
mremap.c
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
nommu.c
mm: remove more IS_ERR_VALUE abuses
2016-05-27 15:57:31 -07:00
oom_kill.c
mm, oom_reaper: do not use siglock in try_oom_reaper()
2016-06-03 16:02:56 -07:00
page_alloc.c
mm, page_alloc: recalculate the preferred zoneref if the context can ignore memory policies
2016-06-03 16:02:57 -07:00
page_counter.c
mm: page_counter: let page_counter_try_charge() return bool
2015-11-05 19:34:48 -08:00
page_ext.c
mm: use early_pfn_to_nid in page_ext_init
2016-05-27 14:49:37 -07:00
page_idle.c
mm: add page_check_address_transhuge() helper
2016-01-15 17:56:32 -08:00
page_io.c
Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-05-17 15:05:23 -07:00
page_isolation.c
mm/memory_hotplug: add comment to some functions related to memory hotplug
2016-05-19 19:12:14 -07:00
page_owner.c
mm: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
page_poison.c
mm: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
page-writeback.c
MM: increase safety margin provided by PF_LESS_THROTTLE
2016-05-20 17:58:30 -07:00
pagewalk.c
thp: rename split_huge_page_pmd() to split_huge_pmd()
2016-01-15 17:56:32 -08:00
percpu-km.c
mm: percpu: use pr_fmt to prefix output
2016-03-17 15:09:34 -07:00
percpu-vm.c
…
percpu.c
mm: percpu: use pr_fmt to prefix output
2016-03-17 15:09:34 -07:00
pgtable-generic.c
mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range
2016-03-17 15:09:34 -07:00
process_vm_access.c
mm/gup: Introduce get_user_pages_remote()
2016-02-16 10:04:09 +01:00
quicklist.c
fix Christoph's email addresses
2016-03-17 15:09:34 -07:00
readahead.c
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
2016-04-04 10:41:08 -07:00
rmap.c
mm: thp: avoid false positive VM_BUG_ON_PAGE in page_move_anon_rmap()
2016-05-27 14:49:37 -07:00
shmem.c
switch xattr_handler->set() to passing dentry and inode separately
2016-05-27 15:39:43 -04:00
slab_common.c
mm: kasan: initial memory quarantine implementation
2016-05-20 17:58:30 -07:00
slab.c
mm, kasan: don't call kasan_krealloc() from ksize().
2016-05-20 17:58:30 -07:00
slab.h
mm: kasan: initial memory quarantine implementation
2016-05-20 17:58:30 -07:00
slob.c
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
slub.c
mm, kasan: don't call kasan_krealloc() from ksize().
2016-05-20 17:58:30 -07:00
sparse-vmemmap.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
sparse.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
swap_cgroup.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
swap_state.c
mm: thp: broken page count after commit aa88b68c3b1d
2016-06-09 14:23:11 -07:00
swap.c
mm: introduce dedicated WQ_MEM_RECLAIM workqueue to do lru_add_drain_all
2016-06-09 14:23:11 -07:00
swapfile.c
mm: thp: calculate the mapcount correctly for THP pages during WP faults
2016-05-12 15:52:50 -07:00
truncate.c
dax: New fault locking
2016-05-19 15:20:54 -06:00
userfaultfd.c
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
2016-04-04 10:41:08 -07:00
util.c
mm: make vm_mmap killable
2016-05-23 17:04:14 -07:00
vmacache.c
mm/vmacache: inline vmacache_valid_mm()
2015-11-05 19:34:48 -08:00
vmalloc.c
mm: fix overflow in vm_map_ram()
2016-06-03 15:06:22 -07:00
vmpressure.c
mm/vmpressure.c: fix subtree pressure detection
2016-02-03 08:28:43 -08:00
vmscan.c
mm, oom: rework oom detection
2016-05-20 17:58:30 -07:00
vmstat.c
mm: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
workingset.c
mm: workingset: make shadow node shrinker memcg aware
2016-03-17 15:09:34 -07:00
z3fold.c
mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
2016-06-03 16:02:55 -07:00
zbud.c
mm/zbud.c: use list_last_entry() instead of list_tail_entry()
2016-01-15 11:40:52 -08:00
zpool.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zsmalloc.c
update "mm/zsmalloc: don't fail if can't create debugfs info"
2016-05-26 15:35:44 -07:00
zswap.c
mm/zswap: use workqueue to destroy pool
2016-05-20 17:58:30 -07:00