26 Jul, 2011
40 commits
-
2.6.36's 7e496299d4d2 ("tmpfs: make tmpfs scalable with percpu_counter for
used blocks") to make tmpfs scalable with percpu_counter used
inode->i_lock in place of sbinfo->stat_lock around i_blocks updates; but
that was adverse to scalability, and unnecessary, since info->lock is
already held there in the fast paths.Remove those uses of i_lock, and add info->lock in the three error paths
where it's then needed across shmem_free_blocks(). It's not actually
needed across shmem_unacct_blocks(), but they're so often paired that it
looks wrong to split them apart.Signed-off-by: Hugh Dickins
Acked-by: Tim Chen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
truncate_inode_pages_range()'s final loop has a nice pincer property,
bringing start and end together, squeezing out the last pages. But the
range handling missed out on that, just sliding up the range, perhaps
letting pages come in behind it. Add one more test to give it the same
pincer effect.Signed-off-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make the pagevec_lookup loops in truncate_inode_pages_range(),
invalidate_mapping_pages() and invalidate_inode_pages2_range() more
consistent with each other.They were relying upon page->index of an unlocked page, but apologizing
for it: accept it, embrace it, add comments and WARN_ONs, and simplify the
index handling.invalidate_inode_pages2_range() had special handling for a wrapped
page->index + 1 = 0 case; but MAX_LFS_FILESIZE doesn't let us anywhere
near there, and a corrupt page->index in the radix_tree could cause more
trouble than that would catch. Remove that wrapped handling.invalidate_inode_pages2_range() uses min() to limit the pagevec_lookup
when near the end of the range: copy that into the other two, although
it's less useful than you might think (it limits the use of the buffer,
rather than the indices looked up).Signed-off-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Use consistent variable names in truncate_pagecache(), truncate_setsize(),
vmtruncate() and vmtruncate_range().unmap_mapping_range() and vmtruncate_range() have mismatched interfaces:
don't change either, but make the vmtruncates more precise about what they
expect unmap_mapping_range() to do.vmtruncate_range() is currently called only with page-aligned start and
end+1: can handle unaligned start, but unaligned end+1 would hit BUG_ON in
truncate_inode_pages_range() (lacks partial clearing of the end page).Signed-off-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Correct comment on truncate_inode_pages*() in linux/mm.h; and remove
declaration of page_unuse(), it didn't exist even in 2.2.26 or 2.4.0!Signed-off-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The often-NULL data arg to read_cache_page() and read_mapping_page()
functions is misdescribed as "destination for read data": no, it's the
first arg to the filler function, often struct file * to ->readpage().Satisfy checkpatch.pl on those filler prototypes, and tidy up the
declarations in linux/pagemap.h.Signed-off-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: David S. Miller
Signed-off-by: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Luckily there are still a few software PTE bits remaining and they even
match up in both the sun4u and sun4v pte layouts.Signed-off-by: David S. Miller
Signed-off-by: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make use of the generic RCU page table freeing on Sparc64, doing so allows
for race-free software page-table walkers like gup_fast().Signed-off-by: David S. Miller
Signed-off-by: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
With the recent mmu_gather changes that included generic RCU freeing of
page-tables, it is now quite straightforward to implement gup_fast() on
sparc64.This patch:
Remove the page table quicklists. They are pointless and make it harder
to use RCU page table freeing and share code with other architectures.BTW, this is the second time this has happened, see commit 3c936465249f
("[SPARC64]: Kill pgtable quicklists and use SLAB.")Signed-off-by: David S. Miller
Signed-off-by: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- shmem pages are not immediately available, but they are not
potentially available either, even if we swap them out, they will just
relocate from memory into swap, total amount of immediate and
potentially available memory is not going to be affected, so we
shouldn't count them as potentially free in the first place.- nr_free_pages() is not an expensive operation anymore, there is no
need to split the decision making in two halves and repeat code.Signed-off-by: Dmitry Fink
Reviewed-by: Minchan Kim
Acked-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
RED_INACTIVE is a slab thing, and reusing it for memblock was
inappropriate, because memblock is dealing with phys_addr_t's which have a
Kconfigurable sizeof().Create a new poison type for this application. Fixes the sparse warning
warning: cast truncates bits from constant value (9f911029d74e35b becomes 9d74e35b)
Reported-by: H Hartley Sweeten
Tested-by: H Hartley Sweeten
Acked-by: Pekka Enberg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
/proc/pid/oom_adj is deprecated and scheduled for removal in August 2012
according to Documentation/feature-removal-schedule.txt.This patch makes the warning more verbose by making it appear as a more
serious problem (the presence of a stack trace and being multiline should
attract more attention) so that applications still using the old interface
can get fixed.Very popular users of the old interface have been converted since the oom
killer rewrite has been introduced. udevd switched to the
/proc/pid/oom_score_adj interface for v162, kde switched in 4.6.1, and
opensshd switched in 5.7p1.At the start of 2012, this should be changed into a WARN() to emit all
such incidents and then finally remove the tunable in August 2012 as
scheduled.Signed-off-by: David Rientjes
Cc: KAMEZAWA Hiroyuki
Cc: KOSAKI Motohiro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The badness() function in the oom killer was renamed to oom_badness() in
a63d83f427fb ("oom: badness heuristic rewrite") since it is a globally
exported function for clarity.The prototype for the old function still existed in linux/oom.h, so remove
it. There are no existing users.Also fixes documentation and comment references to badness() and adjusts
them accordingly.Signed-off-by: David Rientjes
Reviewed-by: KOSAKI Motohiro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
ZAP_BLOCK_SIZE became unused in the preemptible-mmu_gather work ("mm:
Remove i_mmap_lock lockbreak"). So zap it.Cc: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix coding style issues flagged by checkpatch.pl
Signed-off-by: Chris Forbes
Acked-by: Eric B Munson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The lock is released first thing in all three branches. Simplify this by
unconditionally releasing lock and remove else clause which was only there
to be sure lock was released.Signed-off-by: Chris Wright
Reviewed-by: Michal Hocko
Cc: Andrea Arcangeli
Acked-by: Johannes Weiner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Commit a539f3533b78e3 ("mm: add SECTION_ALIGN_UP() and
SECTION_ALIGN_DOWN() macro") introduced the SECTION_ALIGN_UP() and
SECTION_ALIGN_DOWN() macros. Use those macros to increase code
readability.Signed-off-by: Daniel Kiper
Acked-by: David Rientjes
Acked-by: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In commit a2c8990aed5ab ("memsw: remove noswapaccount kernel parameter"),
Michal forgot to remove some left pieces of noswapaccount in the tree,
this patch removes them all.Signed-off-by: WANG Cong
Acked-by: Michal Hocko
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Commit bae9c19bf1 ("thp: split_huge_page_mm/vma") changed locking behavior
of walk_page_range(). Thus this patch changes the comment too.Signed-off-by: KOSAKI Motohiro
Cc: Naoya Horiguchi
Cc: Hiroyuki Kamezawa
Cc: Andrea Arcangeli
Cc: Matt Mackall
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Originally, walk_hugetlb_range() didn't require a caller take any lock.
But commit d33b9f45bd ("mm: hugetlb: fix hugepage memory leak in
walk_page_range") changed its rule. Because it added find_vma() call in
walk_hugetlb_range().Any locking-rule change commit should write a doc too.
[akpm@linux-foundation.org: clarify comment]
Signed-off-by: KOSAKI Motohiro
Cc: Naoya Horiguchi
Cc: Hiroyuki Kamezawa
Cc: Andrea Arcangeli
Cc: Matt Mackall
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently, walk_page_range() calls find_vma() every page table for walk
iteration. but it's completely unnecessary if walk->hugetlb_entry is
unused. And we don't have to assume find_vma() is a lightweight
operation. So this patch checks the walk->hugetlb_entry and avoids the
find_vma() call if possible.This patch also makes some cleanups. 1) remove ugly uninitialized_var()
and 2) #ifdef in function body.Signed-off-by: KOSAKI Motohiro
Cc: Naoya Horiguchi
Cc: Hiroyuki Kamezawa
Cc: Andrea Arcangeli
Cc: Matt Mackall
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The doc of find_vma() says,
/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
{
(snip)Thus, caller should confirm whether the returned vma matches a desired one.
Signed-off-by: KOSAKI Motohiro
Cc: Naoya Horiguchi
Cc: Hiroyuki Kamezawa
Cc: Andrea Arcangeli
Cc: Matt Mackall
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Document some swap token aging design decisions.
Signed-off-by: KOSAKI Motohiro
Acked-by: Rik van Riel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
global_faults and last_aging are only used in grab_swap_token(). Move
them into grab_swap_token().Signed-off-by: KOSAKI Motohiro
Acked-by: Rik van Riel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
http://www.cs.wm.edu/~sjiang/token.pdf is now dead. Replace it with an
alive alternative.Signed-off-by: KOSAKI Motohiro
Acked-by: Rik van Riel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Memory hotplug support for Xen balloon driver. It should be mentioned
that hotplugged memory is not onlined automatically. It should be onlined
by user through standard sysfs interface.Memory could be hotplugged in following steps:
1) dom0: xl mem-max
where is >= requested memory size,2) dom0: xl mem-set
where is requested memory size; alternatively memory
could be added by writing proper value to
/sys/devices/system/xen_memory/xen_memory0/target or
/sys/devices/system/xen_memory/xen_memory0/target_kb on dumU,3) domU: for i in /sys/devices/system/memory/memory*/state; do \
[ "`cat "$i"`" = offline ] && echo online > "$i"; doneMemory could be onlined automatically on domU by adding following line to
udev rules:SUBSYSTEM=="memory", ACTION=="add", RUN+="/bin/sh -c '[ -f /sys$devpath/state ] && echo online > /sys$devpath/state'"
In that case step 3 should be omitted.
Signed-off-by: Daniel Kiper
Acked-by: Konrad Rzeszutek Wilk
Cc: Ian Campbell
Cc: Jeremy Fitzhardinge
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch contains online_page_callback and apropriate functions for
registering/unregistering online page callbacks. It allows to do some
machine specific tasks during online page stage which is required to
implement memory hotplug in virtual machines. Currently this patch is
required by latest memory hotplug support for Xen balloon driver patch
which will be posted soon.Additionally, originial online_page() function was splited into
following functions doing "atomic" operations:- __online_page_set_limits() - set new limits for memory management code,
- __online_page_increment_counters() - increment totalram_pages and totalhigh_pages,
- __online_page_free() - free page to allocator.It was done to:
- not duplicate existing code,
- ease hotplug code devolpment by usage of well defined interface,
- avoid stupid bugs which are unavoidable when the same code
(by design) is developed in many places.[akpm@linux-foundation.org: use explicit indirect-call syntax]
Signed-off-by: Daniel Kiper
Reviewed-by: Konrad Rzeszutek Wilk
Cc: Ian Campbell
Cc: Jeremy Fitzhardinge
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Since commit a19a6ee "backlight: Allow properties to be passed at
registration" and commit bb7ca74 "backlight: add backlight type", we can
set backlight type and max_brightness before backlights are registered.
Some newly added drivers did not set it properly, let's fix it.Signed-off-by: Axel Lin
Cc: Matthew Garrett
Cc: Jingoo Han
Cc: Donghwa Lee
Cc: InKi Dae
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add the ams369fg06 amoled panel driver. The ams369fg06 amoled panel (480
x 800) driver uses 3-wired SPI inteface. The brightness can be controlled
by gamma setting of amoled panel.[sfr@canb.auug.org.au: fix build error]
[axel.lin@gmail.com: unregister backlight device when unloading the module]
[axel.lin@gmail.com: staticize ams369fg06_shutdown]
Signed-off-by: Jingoo Han
Cc: Richard Purdie
Cc: Inki Dae
Cc: anish singh
Signed-off-by: Stephen Rothwell
Signed-off-by: Axel Lin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We have set props.max_brightness before registering backlight device.
Signed-off-by: Axel Lin
Acked-by: Mike Frysinger
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- Fix checking of wrong return value for backlight_device_register()
- Properly free allocated resources in ld9040_probe() error path and
ld9040_remove().Signed-off-by: Axel Lin
Cc: Donghwa Lee
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Vito said:
: The system has many usb disks coming and going day to day, with their
: respective bdi's having min_ratio set to 1 when inserted. It works for
: some time until eventually min_ratio can no longer be set, even when the
: active set of bdi's seen in /sys/class/bdi/*/min_ratio doesn't add up to
: anywhere near 100.
:
: This then leads to an unrelated starvation problem caused by write-heavy
: fuse mounts being used atop the usb disks, a problem the min_ratio setting
: at the underlying devices bdi effectively prevents.Fix this leakage by resetting the bdi min_ratio when unregistering the
BDI.Signed-off-by: Peter Zijlstra
Reported-by: Vito Caputo
Cc: Wu Fengguang
Cc: Miklos Szeredi
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
If dmi_get_system_info() returns NULL, pch_phub_probe() will dereferencea
a zero pointer.This oops was observed on an Atom based board which has no BIOS, but a
bootloder which doesn't privde DMI data.Signed-off-by: Alexander Stein
Cc: Tomoya MORINAGA
Cc: Greg KH
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix the following build error:
arch/xtensa/include/asm/uaccess.h:403: error: implicit declaration of function 'prefetch'
arch/xtensa/include/asm/uaccess.h:412: error: implicit declaration of function 'prefetchw'Signed-off-by: WANG Cong
Cc: Chris Zankel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Prevent an arbitrary kernel read. Check the user pointer with access_ok()
before copying data in.[akpm@linux-foundation.org: s/EIO/EFAULT/]
Signed-off-by: Dan Rosenberg
Cc: Christian Zankel
Cc: Oleg Nesterov
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In a subsquent patch I have a const struct page in my hand...
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Ian Campbell
Cc: Andrea Arcangeli
Cc: Rik van Riel
Cc: Martin Schwidefsky
Cc: Michel Lespinasse
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
These uses are read-only and in a subsequent patch I have a const struct
page in my hand...[akpm@linux-foundation.org: fix warnings in lowmem_page_address()]
Signed-off-by: Ian Campbell
Cc: Rik van Riel
Cc: Andrea Arcangeli
Cc: Mel Gorman
Cc: Michel Lespinasse
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
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: Becky Bruce
Cc: Benjamin Herrenschmidt
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This:
vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)
is incorrect on 32-bit. It causes us to & the pgoff with something that
looks like this (for a 4m hugepage): 0xfff003ff. The mask should be
flipped and *then* shifted, to give you 0x0000_03fff.Signed-off-by: Becky Bruce
Cc: Benjamin Herrenschmidt
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
