07 Oct, 2012
1 commit
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Pull SLAB changes from Pekka Enberg:
"New and noteworthy:* More SLAB allocator unification patches from Christoph Lameter and
others. This paves the way for slab memcg patches that hopefully
will land in v3.8.* SLAB tracing improvements from Ezequiel Garcia.
* Kernel tainting upon SLAB corruption from Dave Jones.
* Miscellanous SLAB allocator bug fixes and improvements from various
people."* 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux: (43 commits)
slab: Fix build failure in __kmem_cache_create()
slub: init_kmem_cache_cpus() and put_cpu_partial() can be static
mm/slab: Fix kmem_cache_alloc_node_trace() declaration
Revert "mm/slab: Fix kmem_cache_alloc_node_trace() declaration"
mm, slob: fix build breakage in __kmalloc_node_track_caller
mm/slab: Fix kmem_cache_alloc_node_trace() declaration
mm/slab: Fix typo _RET_IP -> _RET_IP_
mm, slub: Rename slab_alloc() -> slab_alloc_node() to match SLAB
mm, slab: Rename __cache_alloc() -> slab_alloc()
mm, slab: Match SLAB and SLUB kmem_cache_alloc_xxx_trace() prototype
mm, slab: Replace 'caller' type, void* -> unsigned long
mm, slob: Add support for kmalloc_track_caller()
mm, slab: Remove silly function slab_buffer_size()
mm, slob: Use NUMA_NO_NODE instead of -1
mm, sl[au]b: Taint kernel when we detect a corrupted slab
slab: Only define slab_error for DEBUG
slab: fix the DEADLOCK issue on l3 alien lock
slub: Zero initial memory segment for kmem_cache and kmem_cache_node
Revert "mm/sl[aou]b: Move sysfs_slab_add to common"
mm/sl[aou]b: Move kmem_cache refcounting to common code
...
06 Oct, 2012
1 commit
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Signed-off-by: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
03 Oct, 2012
10 commits
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Fix up a trivial conflict with NUMA_NO_NODE cleanups.
Conflicts:
mm/slob.cSigned-off-by: Pekka Enberg
-
Fix build failure with CONFIG_DEBUG_SLAB=y && CONFIG_DEBUG_PAGEALLOC=y caused
by commit 8a13a4cc "mm/sl[aou]b: Shrink __kmem_cache_create() parameter lists".mm/slab.c: In function '__kmem_cache_create':
mm/slab.c:2474: error: 'align' undeclared (first use in this function)
mm/slab.c:2474: error: (Each undeclared identifier is reported only once
mm/slab.c:2474: error: for each function it appears in.)
make[1]: *** [mm/slab.o] Error 1
make: *** [mm] Error 2Acked-by: Christoph Lameter
Signed-off-by: Tetsuo Handa
Signed-off-by: Pekka Enberg -
Acked-by: Glauber Costa
Acked-by: Christoph Lameter
Acked-by: David Rientjes
Signed-off-by: Fengguang Wu
Signed-off-by: Pekka Enberg -
Pull frontswap update from Konrad Rzeszutek Wilk:
"Features:
- Support exlusive get if backend is capable.
Bug-fixes:
- Fix compile warnings
- Add comments/cleanup doc
- Fix wrong if condition"* tag 'stable/for-linus-3.7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm:
frontswap: support exclusive gets if tmem backend is capable
mm: frontswap: fix a wrong if condition in frontswap_shrink
mm/frontswap: fix uninit'ed variable warning
mm/frontswap: cleanup doc and comment error
mm: frontswap: remove unneeded headers -
Pull vfs update from Al Viro:
- big one - consolidation of descriptor-related logics; almost all of
that is moved to fs/file.c(BTW, I'm seriously tempted to rename the result to fd.c. As it is,
we have a situation when file_table.c is about handling of struct
file and file.c is about handling of descriptor tables; the reasons
are historical - file_table.c used to be about a static array of
struct file we used to have way back).A lot of stray ends got cleaned up and converted to saner primitives,
disgusting mess in android/binder.c is still disgusting, but at least
doesn't poke so much in descriptor table guts anymore. A bunch of
relatively minor races got fixed in process, plus an ext4 struct file
leak.- related thing - fget_light() partially unuglified; see fdget() in
there (and yes, it generates the code as good as we used to have).- also related - bits of Cyrill's procfs stuff that got entangled into
that work; _not_ all of it, just the initial move to fs/proc/fd.c and
switch of fdinfo to seq_file.- Alex's fs/coredump.c spiltoff - the same story, had been easier to
take that commit than mess with conflicts. The rest is a separate
pile, this was just a mechanical code movement.- a few misc patches all over the place. Not all for this cycle,
there'll be more (and quite a few currently sit in akpm's tree)."Fix up trivial conflicts in the android binder driver, and some fairly
simple conflicts due to two different changes to the sock_alloc_file()
interface ("take descriptor handling from sock_alloc_file() to callers"
vs "net: Providing protocol type via system.sockprotoname xattr of
/proc/PID/fd entries" adding a dentry name to the socket)* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (72 commits)
MAX_LFS_FILESIZE should be a loff_t
compat: fs: Generic compat_sys_sendfile implementation
fs: push rcu_barrier() from deactivate_locked_super() to filesystems
btrfs: reada_extent doesn't need kref for refcount
coredump: move core dump functionality into its own file
coredump: prevent double-free on an error path in core dumper
usb/gadget: fix misannotations
fcntl: fix misannotations
ceph: don't abuse d_delete() on failure exits
hypfs: ->d_parent is never NULL or negative
vfs: delete surplus inode NULL check
switch simple cases of fget_light to fdget
new helpers: fdget()/fdput()
switch o2hb_region_dev_write() to fget_light()
proc_map_files_readdir(): don't bother with grabbing files
make get_file() return its argument
vhost_set_vring(): turn pollstart/pollstop into bool
switch prctl_set_mm_exe_file() to fget_light()
switch xfs_find_handle() to fget_light()
switch xfs_swapext() to fget_light()
... -
Pull cgroup hierarchy update from Tejun Heo:
"Currently, different cgroup subsystems handle nested cgroups
completely differently. There's no consistency among subsystems and
the behaviors often are outright broken.People at least seem to agree that the broken hierarhcy behaviors need
to be weeded out if any progress is gonna be made on this front and
that the fallouts from deprecating the broken behaviors should be
acceptable especially given that the current behaviors don't make much
sense when nested.This patch makes cgroup emit warning messages if cgroups for
subsystems with broken hierarchy behavior are nested to prepare for
fixing them in the future. This was put in a separate branch because
more related changes were expected (didn't make it this round) and the
memory cgroup wanted to pull in this and make changes on top."* 'for-3.7-hierarchy' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them -
Pull cgroup updates from Tejun Heo:
- xattr support added. The implementation is shared with tmpfs. The
usage is restricted and intended to be used to manage per-cgroup
metadata by system software. tmpfs changes are routed through this
branch with Hugh's permission.- cgroup subsystem ID handling simplified.
* 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup: Define CGROUP_SUBSYS_COUNT according the configuration
cgroup: Assign subsystem IDs during compile time
cgroup: Do not depend on a given order when populating the subsys array
cgroup: Wrap subsystem selection macro
cgroup: Remove CGROUP_BUILTIN_SUBSYS_COUNT
cgroup: net_prio: Do not define task_netpioidx() when not selected
cgroup: net_cls: Do not define task_cls_classid() when not selected
cgroup: net_cls: Move sock_update_classid() declaration to cls_cgroup.h
cgroup: trivial fixes for Documentation/cgroups/cgroups.txt
xattr: mark variable as uninitialized to make both gcc and smatch happy
fs: add missing documentation to simple_xattr functions
cgroup: add documentation on extended attributes usage
cgroup: rename subsys_bits to subsys_mask
cgroup: add xattr support
cgroup: revise how we re-populate root directory
xattr: extract simple_xattr code from tmpfs -
Pull workqueue changes from Tejun Heo:
"This is workqueue updates for v3.7-rc1. A lot of activities this
round including considerable API and behavior cleanups.* delayed_work combines a timer and a work item. The handling of the
timer part has always been a bit clunky leading to confusing
cancelation API with weird corner-case behaviors. delayed_work is
updated to use new IRQ safe timer and cancelation now works as
expected.* Another deficiency of delayed_work was lack of the counterpart of
mod_timer() which led to cancel+queue combinations or open-coded
timer+work usages. mod_delayed_work[_on]() are added.These two delayed_work changes make delayed_work provide interface
and behave like timer which is executed with process context.* A work item could be executed concurrently on multiple CPUs, which
is rather unintuitive and made flush_work() behavior confusing and
half-broken under certain circumstances. This problem doesn't
exist for non-reentrant workqueues. While non-reentrancy check
isn't free, the overhead is incurred only when a work item bounces
across different CPUs and even in simulated pathological scenario
the overhead isn't too high.All workqueues are made non-reentrant. This removes the
distinction between flush_[delayed_]work() and
flush_[delayed_]_work_sync(). The former is now as strong as the
latter and the specified work item is guaranteed to have finished
execution of any previous queueing on return.* In addition to the various bug fixes, Lai redid and simplified CPU
hotplug handling significantly.* Joonsoo introduced system_highpri_wq and used it during CPU
hotplug.There are two merge commits - one to pull in IRQ safe timer from
tip/timers/core and the other to pull in CPU hotplug fixes from
wq/for-3.6-fixes as Lai's hotplug restructuring depended on them."Fixed a number of trivial conflicts, but the more interesting conflicts
were silent ones where the deprecated interfaces had been used by new
code in the merge window, and thus didn't cause any real data conflicts.Tejun pointed out a few of them, I fixed a couple more.
* 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (46 commits)
workqueue: remove spurious WARN_ON_ONCE(in_irq()) from try_to_grab_pending()
workqueue: use cwq_set_max_active() helper for workqueue_set_max_active()
workqueue: introduce cwq_set_max_active() helper for thaw_workqueues()
workqueue: remove @delayed from cwq_dec_nr_in_flight()
workqueue: fix possible stall on try_to_grab_pending() of a delayed work item
workqueue: use hotcpu_notifier() for workqueue_cpu_down_callback()
workqueue: use __cpuinit instead of __devinit for cpu callbacks
workqueue: rename manager_mutex to assoc_mutex
workqueue: WORKER_REBIND is no longer necessary for idle rebinding
workqueue: WORKER_REBIND is no longer necessary for busy rebinding
workqueue: reimplement idle worker rebinding
workqueue: deprecate __cancel_delayed_work()
workqueue: reimplement cancel_delayed_work() using try_to_grab_pending()
workqueue: use mod_delayed_work() instead of __cancel + queue
workqueue: use irqsafe timer for delayed_work
workqueue: clean up delayed_work initializers and add missing one
workqueue: make deferrable delayed_work initializer names consistent
workqueue: cosmetic whitespace updates for macro definitions
workqueue: deprecate system_nrt[_freezable]_wq
workqueue: deprecate flush[_delayed]_work_sync()
...
02 Oct, 2012
2 commits
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Pull RCU changes from Ingo Molnar:
0. 'idle RCU':
Adds RCU APIs that allow non-idle tasks to enter RCU idle mode and
provides x86 code to make use of them, allowing RCU to treat
user-mode execution as an extended quiescent state when the new
RCU_USER_QS kernel configuration parameter is specified. (Work is
in progress to port this to a few other architectures, but is not
part of this series.)1. A fix for a latent bug that has been in RCU ever since the addition
of CPU stall warnings. This bug results in false-positive stall
warnings, but thus far only on embedded systems with severely
cut-down userspace configurations.2. Further reductions in latency spikes for huge systems, along with
additional boot-time adaptation to the actual hardware.This is a large change, as it moves RCU grace-period initialization
and cleanup, along with quiescent-state forcing, from softirq to a
kthread. However, it appears to be in quite good shape (famous
last words).3. Updates to documentation and rcutorture, the latter category
including keeping statistics on CPU-hotplug latencies and fixing
some initialization-time races.4. CPU-hotplug fixes and improvements.
5. Idle-loop fixes that were omitted on an earlier submission.
6. Miscellaneous fixes and improvements
In certain RCU configurations new kernel threads will show up (rcu_bh,
rcu_sched), showing RCU processing overhead.* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (90 commits)
rcu: Apply micro-optimization and int/bool fixes to RCU's idle handling
rcu: Userspace RCU extended QS selftest
x86: Exit RCU extended QS on notify resume
x86: Use the new schedule_user API on userspace preemption
rcu: Exit RCU extended QS on user preemption
rcu: Exit RCU extended QS on kernel preemption after irq/exception
x86: Exception hooks for userspace RCU extended QS
x86: Unspaghettize do_general_protection()
x86: Syscall hooks for userspace RCU extended QS
rcu: Switch task's syscall hooks on context switch
rcu: Ignore userspace extended quiescent state by default
rcu: Allow rcu_user_enter()/exit() to nest
rcu: Settle config for userspace extended quiescent state
rcu: Make RCU_FAST_NO_HZ handle adaptive ticks
rcu: New rcu_user_enter_after_irq() and rcu_user_exit_after_irq() APIs
rcu: New rcu_user_enter() and rcu_user_exit() APIs
ia64: Add missing RCU idle APIs on idle loop
xtensa: Add missing RCU idle APIs on idle loop
score: Add missing RCU idle APIs on idle loop
parisc: Add missing RCU idle APIs on idle loop
... -
Pull the trivial tree from Jiri Kosina:
"Tiny usual fixes all over the place"* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (34 commits)
doc: fix old config name of kprobetrace
fs/fs-writeback.c: cleanup riteback_sb_inodes kerneldoc
btrfs: fix the commment for the action flags in delayed-ref.h
btrfs: fix trivial typo for the comment of BTRFS_FREE_INO_OBJECTID
vfs: fix kerneldoc for generic_fh_to_parent()
treewide: fix comment/printk/variable typos
ipr: fix small coding style issues
doc: fix broken utf8 encoding
nfs: comment fix
platform/x86: fix asus_laptop.wled_type module parameter
mfd: printk/comment fixes
doc: getdelays.c: remember to close() socket on error in create_nl_socket()
doc: aliasing-test: close fd on write error
mmc: fix comment typos
dma: fix comments
spi: fix comment/printk typos in spi
Coccinelle: fix typo in memdup_user.cocci
tmiofb: missing NULL pointer checks
tools: perf: Fix typo in tools/perf
tools/testing: fix comment / output typos
...
29 Sep, 2012
1 commit
-
This reverts commit 1e5965bf1f018cc30a4659fa3f1a40146e4276f6. Ezequiel
Garcia has a better fix.
28 Sep, 2012
1 commit
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Speculative cache pagecache lookups can elevate the refcount from
under us, so avoid the false positive. If the refcount is < 2 we'll be
notified by a VM_BUG_ON in put_page_testzero as there are two
put_page(src_page) in a row before returning from this function.Signed-off-by: Andrea Arcangeli
Reviewed-by: Rik van Riel
Reviewed-by: Johannes Weiner
Cc: Hugh Dickins
Cc: Mel Gorman
Cc: Petr Holasek
Cc: Andrew Morton
Signed-off-by: Linus Torvalds
27 Sep, 2012
4 commits
-
Signed-off-by: Al Viro
-
simplifies a bunch of callers...
Signed-off-by: Al Viro
-
Signed-off-by: Al Viro
-
Signed-off-by: Al Viro
26 Sep, 2012
4 commits
-
On Sat, 8 Sep 2012, Ezequiel Garcia wrote:
> @@ -454,15 +455,35 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
> gfp |= __GFP_COMP;
> ret = slob_new_pages(gfp, order, node);
>
> - trace_kmalloc_node(_RET_IP_, ret,
> + trace_kmalloc_node(caller, ret,
> size, PAGE_SIZE << order, gfp, node);
> }
>
> kmemleak_alloc(ret, size, 1, gfp);
> return ret;
> }
> +
> +void *__kmalloc_node(size_t size, gfp_t gfp, int node)
> +{
> + return __do_kmalloc_node(size, gfp, node, _RET_IP_);
> +}
> EXPORT_SYMBOL(__kmalloc_node);
>
> +#ifdef CONFIG_TRACING
> +void *__kmalloc_track_caller(size_t size, gfp_t gfp, unsigned long caller)
> +{
> + return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, caller);
> +}
> +
> +#ifdef CONFIG_NUMA
> +void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
> + int node, unsigned long caller)
> +{
> + return __do_kmalloc_node(size, gfp, node, caller);
> +}
> +#endifThis breaks Pekka's slab/next tree with this:
mm/slob.c: In function '__kmalloc_node_track_caller':
mm/slob.c:488: error: 'gfp' undeclared (first use in this function)
mm/slob.c:488: error: (Each undeclared identifier is reported only once
mm/slob.c:488: error: for each function it appears in.)mm, slob: fix build breakage in __kmalloc_node_track_caller
"mm, slob: Add support for kmalloc_track_caller()" breaks the build
because gfp is undeclared. Fix it.Acked-by: Ezequiel Garcia
Signed-off-by: David Rientjes
Signed-off-by: Pekka Enberg -
The bug was introduced in commit 4052147c0afa ("mm, slab: Match SLAB
and SLUB kmem_cache_alloc_xxx_trace() prototype").Reported-by: Fengguang Wu
Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
The bug was introduced by commit 7c0cb9c64f83 ("mm, slab: Replace
'caller' type, void* -> unsigned long").Reported-by: Fengguang Wu
Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
Resolved conflict in kernel/sched/core.c using Peter Zijlstra's
approach from https://lkml.org/lkml/2012/9/5/585.
25 Sep, 2012
7 commits
-
This patch does not fix anything, and its only goal is to enable us
to obtain some common code between SLAB and SLUB.
Neither behavior nor produced code is affected.Cc: Christoph Lameter
Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
This patch does not fix anything and its only goal is to
produce common code between SLAB and SLUB.Cc: Christoph Lameter
Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
This long (seemingly unnecessary) patch does not fix anything and
its only goal is to produce common code between SLAB and SLUB.Cc: Christoph Lameter
Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
This allows to use _RET_IP_ instead of builtin_address(0), thus
achiveing implementation consistency in all three allocators.
Though maybe a nitpick, the real goal behind this patch is
to be able to obtain common code between SLAB and SLUB.Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
Currently slob falls back to regular kmalloc for this case.
With this patch kmalloc_track_caller() is correctly implemented,
thus tracing the specified caller.This is important to trace accurately allocations performed by
krealloc, kstrdup, kmemdup, etc.Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
This function is seldom used, and can be simply replaced with cachep->size.
Acked-by: David Rientjes
Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg -
Acked-by: David Rientjes
Signed-off-by: Ezequiel Garcia
Signed-off-by: Pekka Enberg
23 Sep, 2012
1 commit
-
This patch replaces list_for_each_continue_rcu() with
list_for_each_entry_continue_rcu() to save a few lines
of code and allow removing list_for_each_continue_rcu().Signed-off-by: Michael Wang
Acked-by: Catalin Marinas
Signed-off-by: Paul E. McKenney
Reviewed-by: Josh Triplett
21 Sep, 2012
2 commits
-
Tmem, as originally specified, assumes that "get" operations
performed on persistent pools never flush the page of data out
of tmem on a successful get, waiting instead for a flush
operation. This is intended to mimic the model of a swap
disk, where a disk read is non-destructive. Unlike a
disk, however, freeing up the RAM can be valuable. Over
the years that frontswap was in the review process, several
reviewers (and notably Hugh Dickins in 2010) pointed out that
this would result, at least temporarily, in two copies of the
data in RAM: one (compressed for zcache) copy in tmem,
and one copy in the swap cache. We wondered if this could
be done differently, at least optionally.This patch allows tmem backends to instruct the frontswap
code that this backend performs exclusive gets. Zcache2
already contains hooks to support this feature. Other
backends are completely unaffected unless/until they are
updated to support this feature.While it is not clear that exclusive gets are a performance
win on all workloads at all times, this small patch allows for
experimentation by backends.P.S. Let's not quibble about the naming of "get" vs "read" vs
"load" etc. The naming is currently horribly inconsistent between
cleancache and frontswap and existing tmem backends, so will need
to be straightened out as a separate patch. "Get" is used
by the tmem architecture spec, existing backends, and
all documentation and presentation material so I am
using it in this patch.Signed-off-by: Dan Magenheimer
Signed-off-by: Konrad Rzeszutek Wilk -
pages_to_unuse is set to 0 to unuse all frontswap pages
But that doesn't happen since a wrong condition in frontswap_shrink
cancel it.-v2: Add comment to explain return value of __frontswap_shrink,
as suggested by Dan Carpenter, thanksSigned-off-by: Zhenzhong Duan
Signed-off-by: Konrad Rzeszutek Wilk
19 Sep, 2012
2 commits
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It doesn't seem worth adding a new taint flag for this, so just re-use
the one from 'bad page'Acked-by: Christoph Lameter # SLUB
Acked-by: David Rientjes
Signed-off-by: Dave Jones
Signed-off-by: Pekka Enberg -
On Tue, 11 Sep 2012, Stephen Rothwell wrote:
> After merging the final tree, today's linux-next build (sparc64 defconfig)
> produced this warning:
>
> mm/slab.c:808:13: warning: '__slab_error' defined but not used [-Wunused-function]
>
> Introduced by commit 945cf2b6199b ("mm/sl[aou]b: Extract a common
> function for kmem_cache_destroy"). All uses of slab_error() are now
> guarded by DEBUG.There is no use case left for slab builds without DEBUG.
Signed-off-by: Christoph Lameter
Signed-off-by: Pekka Enberg
18 Sep, 2012
4 commits
-
There may be a bug when registering section info. For example, on my
Itanium platform, the pfn range of node0 includes the other nodes, so
other nodes' section info will be double registered, and memmap's page
count will equal to 3.node0: start_pfn=0x100, spanned_pfn=0x20fb00, present_pfn=0x7f8a3, => 0x000100-0x20fc00
node1: start_pfn=0x80000, spanned_pfn=0x80000, present_pfn=0x80000, => 0x080000-0x100000
node2: start_pfn=0x100000, spanned_pfn=0x80000, present_pfn=0x80000, => 0x100000-0x180000
node3: start_pfn=0x180000, spanned_pfn=0x80000, present_pfn=0x80000, => 0x180000-0x200000free_all_bootmem_node()
register_page_bootmem_info_node()
register_page_bootmem_info_section()When hot remove memory, we can't free the memmap's page because
page_count() is 2 after put_page_bootmem().sparse_remove_one_section()
free_section_usemap()
free_map_bootmem()
put_page_bootmem()[akpm@linux-foundation.org: add code comment]
Signed-off-by: Xishi Qiu
Signed-off-by: Jiang Liu
Acked-by: Mel Gorman
Cc: "Luck, Tony"
Cc: Yasuaki Ishimatsu
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The heuristic method for buddy has been introduced since commit
43506fad21ca ("mm/page_alloc.c: simplify calculation of combined index
of adjacent buddy lists"). But the page address of higher page's buddy
was wrongly calculated, which will lead page_is_buddy to fail for ever.
IOW, the heuristic method would be disabled with the wrong page address
of higher page's buddy.Calculating the page address of higher page's buddy should be based
higher_page with the offset between index of higher page and index of
higher page's buddy.Signed-off-by: Haifeng Li
Signed-off-by: Gavin Shan
Reviewed-by: Michal Hocko
Cc: KyongHo Cho
Cc: Mel Gorman
Cc: Minchan Kim
Cc: Johannes Weiner
Cc: [2.6.38+]
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
get_partial() is currently not checking pfmemalloc_match() meaning that
it is possible for pfmemalloc pages to leak to non-pfmemalloc users.
This is a problem in the following situation. Assume that there is a
request from normal allocation and there are no objects in the per-cpu
cache and no node-partial slab.In this case, slab_alloc enters the slow path and new_slab_objects() is
called which may return a PFMEMALLOC page. As the current user is not
allowed to access PFMEMALLOC page, deactivate_slab() is called
([5091b74a: mm: slub: optimise the SLUB fast path to avoid pfmemalloc
checks]) and returns an object from PFMEMALLOC page.Next time, when we get another request from normal allocation,
slab_alloc() enters the slow-path and calls new_slab_objects(). In
new_slab_objects(), we call get_partial() and get a partial slab which
was just deactivated but is a pfmemalloc page. We extract one object
from it and re-deactivate."deactivate -> re-get in get_partial -> re-deactivate" occures repeatedly.
As a result, access to PFMEMALLOC page is not properly restricted and it
can cause a performance degradation due to frequent deactivation.
deactivation frequently.This patch changes get_partial_node() to take pfmemalloc_match() into
account and prevents the "deactivate -> re-get in get_partial()
scenario. Instead, new_slab() is called.Signed-off-by: Joonsoo Kim
Acked-by: David Rientjes
Signed-off-by: Mel Gorman
Cc: David Miller
Cc: Chuck Lever
Cc: Pekka Enberg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In array cache, there is a object at index 0, check it.
Signed-off-by: Joonsoo Kim
Signed-off-by: Mel Gorman
Cc: David Miller
Cc: Chuck Lever
Cc: David Rientjes
Cc: Pekka Enberg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
