linux-stable.git/include/linux/mm.h, branch v3.12.2

thp: consolidate code between handle_mm_fault() and do_huge_pmd_anonymous_page()

2013-09-12T22:38:03+00:00

do_huge_pmd_anonymous_page() has copy-pasted piece of handle_mm_fault()
to handle fallback path.

Let's consolidate code back by introducing VM_FAULT_FALLBACK return
code.

Signed-off-by: Kirill A. Shutemov 
Acked-by: Hillf Danton 
Cc: Andrea Arcangeli 
Cc: Al Viro 
Cc: Hugh Dickins 
Cc: Wu Fengguang 
Cc: Jan Kara 
Cc: Mel Gorman 
Cc: Andi Kleen 
Cc: Matthew Wilcox 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

truncate: drop 'oldsize' truncate_pagecache() parameter

2013-09-12T22:38:02+00:00

truncate_pagecache() doesn't care about old size since commit
cedabed49b39 ("vfs: Fix vmtruncate() regression").  Let's drop it.

Signed-off-by: Kirill A. Shutemov 
Cc: OGAWA Hirofumi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

arch: mm: pass userspace fault flag to generic fault handler

2013-09-12T22:38:01+00:00

Unlike global OOM handling, memory cgroup code will invoke the OOM killer
in any OOM situation because it has no way of telling faults occuring in
kernel context - which could be handled more gracefully - from
user-triggered faults.

Pass a flag that identifies faults originating in user space from the
architecture-specific fault handlers to generic code so that memcg OOM
handling can be improved.

Signed-off-by: Johannes Weiner 
Reviewed-by: Michal Hocko 
Cc: David Rientjes 
Cc: KAMEZAWA Hiroyuki 
Cc: azurIt 
Cc: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/hwpoison: don't need to hold compound lock for hugetlbfs page

2013-09-11T22:58:08+00:00

compound lock is introduced by commit e9da73d67("thp: compound_lock."), it
is used to serialize put_page against __split_huge_page_refcount().  In
addition, transparent hugepages will be splitted in hwpoison handler and
just one subpage will be poisoned.  There is unnecessary to hold compound
lock for hugetlbfs page.  This patch replace compound_trans_order by
compond_order in the place where the page is hugetlbfs page.

Signed-off-by: Wanpeng Li 
Reviewed-by: Naoya Horiguchi 
Cc: Andi Kleen 
Cc: Tony Luck 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: munlock: manual pte walk in fast path instead of follow_page_mask()

2013-09-11T22:58:01+00:00

Currently munlock_vma_pages_range() calls follow_page_mask() to obtain
each individual struct page.  This entails repeated full page table
translations and page table lock taken for each page separately.

This patch avoids the costly follow_page_mask() where possible, by
iterating over ptes within single pmd under single page table lock.  The
first pte is obtained by get_locked_pte() for non-THP page acquired by the
initial follow_page_mask().  The rest of the on-stack pagevec for munlock
is filled up using pte_walk as long as pte_present() and vm_normal_page()
are sufficient to obtain the struct page.

After this patch, a 14% speedup was measured for munlocking a 56GB large
memory area with THP disabled.

Signed-off-by: Vlastimil Babka 
Cc: Jörn Engel 
Cc: Mel Gorman 
Cc: Michel Lespinasse 
Cc: Hugh Dickins 
Cc: Rik van Riel 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: track vma changes with VM_SOFTDIRTY bit

2013-09-11T22:57:56+00:00

Pavel reported that in case if vma area get unmapped and then mapped (or
expanded) in-place, the soft dirty tracker won't be able to recognize this
situation since it works on pte level and ptes are get zapped on unmap,
loosing soft dirty bit of course.

So to resolve this situation we need to track actions on vma level, there
VM_SOFTDIRTY flag comes in.  When new vma area created (or old expanded)
we set this bit, and keep it here until application calls for clearing
soft dirty bit.

Thus when user space application track memory changes now it can detect if
vma area is renewed.

Reported-by: Pavel Emelyanov 
Signed-off-by: Cyrill Gorcunov 
Cc: Andy Lutomirski 
Cc: Matt Mackall 
Cc: Xiao Guangrong 
Cc: Marcelo Tosatti 
Cc: KOSAKI Motohiro 
Cc: Stephen Rothwell 
Cc: Peter Zijlstra 
Cc: "Aneesh Kumar K.V" 
Cc: Rob Landley 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'x86/mce' into x86/ras

2013-08-12T15:54:05+00:00

Pursue a single RAS/MCE topic branch on x86.

Signed-off-by: Ingo Molnar

mce: acpi/apei: Soft-offline a page on firmware GHES notification

2013-07-10T18:35:02+00:00

If the firmware indicates in GHES error data entry that the error threshold
has exceeded for a corrected error event, then we try to soft-offline the
page. This could be called in interrupt context, so we queue this up similar
to how we handle memory failure scenarios.

Signed-off-by: Naveen N. Rao 
Acked-by: Borislav Petkov 
Signed-off-by: Tony Luck

mm: remove unused VM_ macros and expand other in-place

2013-07-09T17:33:23+00:00

These VM_ macros aren't used very often and three of them
aren't used at all.

Expand the ones that are used in-place, and remove all the now unused
#define VM_ macros.

VM_READHINTMASK, VM_NormalReadHint and VM_ClearReadHint were added just
before 2.4 and appears have never been used.

Signed-off-by: Joe Perches 
Acked-by: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: introduce helper function set_max_mapnr()

2013-07-03T23:07:38+00:00

Introduce a helper function set_max_mapnr() to set global variable
max_mapnr.

Also unify condition compilation for max_mapnr with
CONFIG_NEED_MULTIPLE_NODES instead of CONFIG_DISCONTIGMEM.

Signed-off-by: Jiang Liu 
Cc: Greg Kroah-Hartman 
Cc: Mauro Carvalho Chehab 
Cc: "David S. Miller" 
Cc: Mark Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds