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2011-01-15Merge branch 'slub/hotplug' into slab/urgentPekka Enberg
2011-01-13mm: convert sprintf_symbol to %pSJoe Perches
Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Jiri Kosina <trivial@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-11slub: Avoid use of slub_lock in show_slab_objects()Christoph Lameter
The purpose of the locking is to prevent removal and additions of nodes when statistics are gathered for a slab cache. So we need to avoid racing with memory hotplug functionality. It is enough to take the memory hotplug locks there instead of the slub_lock. online_pages() currently does not acquire the memory_hotplug lock. Another patch will be submitted by the memory hotplug authors to take the memory hotplug lock and describe the uses of the memory hotplug lock to protect against adding and removal of nodes from non hotplug data structures. Cc: <stable@kernel.org> # 2.6.37 Reported-and-tested-by: Bart Van Assche <bvanassche@acm.org> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2011-01-10Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: slub: Fix a crash during slabinfo -v tracing/slab: Move kmalloc tracepoint out of inline code slub: Fix slub_lock down/up imbalance slub: Fix build breakage in Documentation/vm slub tracing: move trace calls out of always inlined functions to reduce kernel code size slub: move slabinfo.c to tools/slub/slabinfo.c
2011-01-07kernel: kmem_ptr_validate considered harmfulNick Piggin
This is a nasty and error prone API. It is no longer used, remove it. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2010-12-04slub: Fix a crash during slabinfo -vTero Roponen
Commit f7cb1933621bce66a77f690776a16fe3ebbc4d58 ("SLUB: Pass active and inactive redzone flags instead of boolean to debug functions") missed two instances of check_object(). This caused a lot of warnings during 'slabinfo -v' finally leading to a crash: BUG ext4_xattr: Freepointer corrupt ... BUG buffer_head: Freepointer corrupt ... BUG ext4_alloc_context: Freepointer corrupt ... ... BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 IP: [<ffffffff810a291f>] file_sb_list_del+0x1c/0x35 PGD 79d78067 PUD 79e67067 PMD 0 Oops: 0002 [#1] SMP last sysfs file: /sys/kernel/slab/:t-0000192/validate This patch fixes the problem by converting the two missed instances. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tero Roponen <tero.roponen@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-12-04slub: Fix a crash during slabinfo -vTero Roponen
Commit f7cb1933621bce66a77f690776a16fe3ebbc4d58 ("SLUB: Pass active and inactive redzone flags instead of boolean to debug functions") missed two instances of check_object(). This caused a lot of warnings during 'slabinfo -v' finally leading to a crash: BUG ext4_xattr: Freepointer corrupt ... BUG buffer_head: Freepointer corrupt ... BUG ext4_alloc_context: Freepointer corrupt ... ... BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 IP: [<ffffffff810a291f>] file_sb_list_del+0x1c/0x35 PGD 79d78067 PUD 79e67067 PMD 0 Oops: 0002 [#1] SMP last sysfs file: /sys/kernel/slab/:t-0000192/validate This patch fixes the problem by converting the two missed instances. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tero Roponen <tero.roponen@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-11-14slub: Fix slub_lock down/up imbalancePavel Emelyanov
There are two places, that do not release the slub_lock. Respective bugs were introduced by sysfs changes ab4d5ed5 (slub: Enable sysfs support for !CONFIG_SLUB_DEBUG) and 2bce6485 ( slub: Allow removal of slab caches during boot). Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-11-06slub: Fix slub_lock down/up imbalancePavel Emelyanov
There are two places, that do not release the slub_lock. Respective bugs were introduced by sysfs changes ab4d5ed5 (slub: Enable sysfs support for !CONFIG_SLUB_DEBUG) and 2bce6485 ( slub: Allow removal of slab caches during boot). Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-11-06slub tracing: move trace calls out of always inlined functions to reduce ↵Richard Kennedy
kernel code size Having the trace calls defined in the always inlined kmalloc functions in include/linux/slub_def.h causes a lot of code duplication as the trace functions get instantiated for each kamalloc call site. This can simply be removed by pushing the trace calls down into the functions in slub.c. On my x86_64 built this patch shrinks the code size of the kernel by approx 36K and also shrinks the code size of many modules -- too many to list here ;) size vmlinux (2.6.36) reports text data bss dec hex filename 5410611 743172 828928 6982711 6a8c37 vmlinux 5373738 744244 828928 6946910 6a005e vmlinux + patch The resulting kernel has had some testing & kmalloc trace still seems to work. This patch - moves trace_kmalloc out of the inlined kmalloc() and pushes it down into kmem_cache_alloc_trace() so this it only get instantiated once. - rename kmem_cache_alloc_notrace() to kmem_cache_alloc_trace() to indicate that now is does have tracing. (maybe this would better being called something like kmalloc_kmem_cache ?) - adds a new function kmalloc_order() to handle allocation and tracing of large allocations of page order. - removes tracing from the inlined kmalloc_large() replacing them with a call to kmalloc_order(); - move tracing out of inlined kmalloc_node() and pushing it down into kmem_cache_alloc_node_trace - rename kmem_cache_alloc_node_notrace() to kmem_cache_alloc_node_trace() - removes the include of trace/events/kmem.h from slub_def.h. v2 - keep kmalloc_order_trace inline when !CONFIG_TRACE Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-06SLUB: Fix memory hotplug with !NUMAPekka Enberg
This patch fixes the following build breakage when memory hotplug is enabled on UMA configurations: /home/test/linux-2.6/mm/slub.c: In function 'kmem_cache_init': /home/test/linux-2.6/mm/slub.c:3031:2: error: 'slab_memory_callback' undeclared (first use in this function) /home/test/linux-2.6/mm/slub.c:3031:2: note: each undeclared identifier is reported only once for each function it appears in make[2]: *** [mm/slub.o] Error 1 make[1]: *** [mm] Error 2 make: *** [sub-make] Error 2 Reported-by: Zimny Lech <napohybelskurwysynom2010@gmail.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-06slub: Move functions to reduce #ifdefsChristoph Lameter
There is a lot of #ifdef/#endifs that can be avoided if functions would be in different places. Move them around and reduce #ifdef. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-06slub: Enable sysfs support for !CONFIG_SLUB_DEBUGChristoph Lameter
Currently disabling CONFIG_SLUB_DEBUG also disabled SYSFS support meaning that the slabs cannot be tuned without DEBUG. Make SYSFS support independent of CONFIG_SLUB_DEBUG Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-06SLUB: Optimize slab_free() debug checkPekka Enberg
This patch optimizes slab_free() debug check to use "c->node != NUMA_NO_NODE" instead of "c->node >= 0" because the former generates smaller code on x86-64: Before: 4736: 48 39 70 08 cmp %rsi,0x8(%rax) 473a: 75 26 jne 4762 <kfree+0xa2> 473c: 44 8b 48 10 mov 0x10(%rax),%r9d 4740: 45 85 c9 test %r9d,%r9d 4743: 78 1d js 4762 <kfree+0xa2> After: 4736: 48 39 70 08 cmp %rsi,0x8(%rax) 473a: 75 23 jne 475f <kfree+0x9f> 473c: 83 78 10 ff cmpl $0xffffffffffffffff,0x10(%rax) 4740: 74 1d je 475f <kfree+0x9f> This patch also cleans up __slab_alloc() to use NUMA_NO_NODE instead of "-1" for enabling debugging for a per-CPU cache. Acked-by: Christoph Lameter <cl@linux.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Move NUMA-related functions under CONFIG_NUMANamhyung Kim
Make kmalloc_cache_alloc_node_notrace(), kmalloc_large_node() and __kmalloc_node_track_caller() to be compiled only when CONFIG_NUMA is selected. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Add lock release annotationNamhyung Kim
The unfreeze_slab() releases page's PG_locked bit but was missing proper annotation. The deactivate_slab() needs to be marked also since it calls unfreeze_slab() without grabbing the lock. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Fix signedness warningsNamhyung Kim
The bit-ops routines require its arg to be a pointer to unsigned long. This leads sparse to complain about different signedness as follows: mm/slub.c:2425:49: warning: incorrect type in argument 2 (different signedness) mm/slub.c:2425:49: expected unsigned long volatile *addr mm/slub.c:2425:49: got long *map Acked-by: Christoph Lameter <cl@linux.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: extract common code to remove objects from partial list without lockingChristoph Lameter
There are a couple of places where repeat the same statements when removing a page from the partial list. Consolidate that into __remove_partial(). Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02SLUB: Pass active and inactive redzone flags instead of boolean to debug ↵Christoph Lameter
functions Pass the actual values used for inactive and active redzoning to the functions that check the objects. Avoids a lot of the ? : things to lookup the values in the functions. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: reduce differences between SMP and NUMAChristoph Lameter
Reduce the #ifdefs and simplify bootstrap by making SMP and NUMA as much alike as possible. This means that there will be an additional indirection to get to the kmem_cache_node field under SMP. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02Revert "Slub: UP bandaid"Pekka Enberg
This reverts commit 5249d039500f05a5ab379286b1d23ab9b04d3f2c. It's not needed after commit bbddff0545878a8649c091a9dd7c43ce91516734 ("percpu: use percpu allocator on UP too").
2010-10-02SLUB: Fix merged slab cache namesPekka Enberg
As explained by Linus "I'm Proud to be an American" Torvalds: Looking at the merging code, I actually think it's totally buggy. If you have something like this: - load module A: create slab cache A - load module B: create slab cache B that can merge with A - unload module A - "cat /proc/slabinfo": BOOM. Oops. exactly because the name is not handled correctly, and you'll have module B holding open a slab cache that has a name pointer that points to module A that no longer exists. This patch fixes the problem by using kstrdup() to allocate dynamic memory for ->name of "struct kmem_cache" as suggested by Christoph Lameter. Acked-by: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org> Conflicts: mm/slub.c
2010-10-02Slub: UP bandaidChristoph Lameter
Since the percpu allocator does not provide early allocation in UP mode (only in SMP configurations) use __get_free_page() to improvise a compound page allocation that can be later freed via kfree(). Compound pages will be released when the cpu caches are resized. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: fix SLUB_RESILIENCY_TEST for dynamic kmalloc cachesDavid Rientjes
Now that the kmalloc_caches array is dynamically allocated at boot, SLUB_RESILIENCY_TEST needs to be fixed to pass the correct type. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Fix up missing kmalloc_cache -> kmem_cache_node case for memoryhotplugChristoph Lameter
Memory hotplug allocates and frees per node structures. Use the correct name. Acked-by: David Rientjes <rientjes@google.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Add dummy functions for the !SLUB_DEBUG caseChristoph Lameter
On Wed, 25 Aug 2010, Randy Dunlap wrote: > mm/slub.c:1732: error: implicit declaration of function 'slab_pre_alloc_hook' > mm/slub.c:1751: error: implicit declaration of function 'slab_post_alloc_hook' > mm/slub.c:1881: error: implicit declaration of function 'slab_free_hook' > mm/slub.c:1886: error: implicit declaration of function 'slab_free_hook_irq' Empty functions are missing if the runtime debuggability option is compiled out. Provide the fall back functions to empty hooks if SLUB_DEBUG is not set. Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Move gfpflag masking out of the hotpathChristoph Lameter
Move the gfpflags masking into the hooks for checkers and into the slowpaths. gfpflag masking requires access to a global variable and thus adds an additional cacheline reference to the hotpaths. If no hooks are active then the gfpflag masking will result in code that the compiler can toss out. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Extract hooks for memory checkers from hotpathsChristoph Lameter
Extract the code that memory checkers and other verification tools use from the hotpaths. Makes it easier to add new ones and reduces the disturbances of the hotpaths. Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Dynamically size kmalloc cache allocationsChristoph Lameter
kmalloc caches are statically defined and may take up a lot of space just because the sizes of the node array has to be dimensioned for the largest node count supported. This patch makes the size of the kmem_cache structure dynamic throughout by creating a kmem_cache slab cache for the kmem_cache objects. The bootstrap occurs by allocating the initial one or two kmem_cache objects from the page allocator. C2->C3 - Fix various issues indicated by David - Make create kmalloc_cache return a kmem_cache * pointer. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Remove static kmem_cache_cpu array for bootChristoph Lameter
The percpu allocator can now handle allocations during early boot. So drop the static kmem_cache_cpu array. Cc: Tejun Heo <tj@kernel.org> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Remove dynamic dma slab allocationChristoph Lameter
Remove the dynamic dma slab allocation since this causes too many issues with nested locks etc etc. The change avoids passing gfpflags into many functions. V3->V4: - Create dma caches in kmem_cache_init() instead of kmem_cache_init_late(). Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-10-02slub: Force no inlining of debug functionsChristoph Lameter
Compiler folds the debgging functions into the critical paths. Avoid that by adding noinline to the functions that check for problems. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-08-06Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: slub: Allow removal of slab caches during boot Revert "slub: Allow removal of slab caches during boot" slub numa: Fix rare allocation from unexpected node slab: use deferable timers for its periodic housekeeping slub: Use kmem_cache flags to detect if slab is in debugging mode. slub: Allow removal of slab caches during boot slub: Check kasprintf results in kmem_cache_init() SLUB: Constants need UL slub: Use a constant for a unspecified node. SLOB: Free objects to their own list slab: fix caller tracking on !CONFIG_DEBUG_SLAB && CONFIG_TRACING
2010-08-04Merge branches 'slab/fixes', 'slob/fixes', 'slub/cleanups' and 'slub/fixes' ↵Pekka Enberg
into for-linus
2010-08-03slub: Allow removal of slab caches during bootChristoph Lameter
Serialize kmem_cache_create and kmem_cache_destroy using the slub_lock. Only possible after the use of the slub_lock during dynamic dma creation has been removed. Then make sure that the setup of the slab sysfs entries does not race with kmem_cache_create and kmem_cache destroy. If a slab cache is removed before we have setup sysfs then simply skip over the sysfs handling. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-08-03Revert "slub: Allow removal of slab caches during boot"Pekka Enberg
This reverts commit f5b801ac38a9612b380ee9a75ab1861f0594e79f.
2010-07-29slub numa: Fix rare allocation from unexpected nodeChristoph Lameter
The network developers have seen sporadic allocations resulting in objects coming from unexpected NUMA nodes despite asking for objects from a specific node. This is due to get_partial() calling get_any_partial() if partial slabs are exhausted for a node even if a node was specified and therefore one would expect allocations only from the specified node. get_any_partial() sporadically may return a slab from a foreign node to gradually reduce the size of partial lists on remote nodes and thereby reduce total memory use for a slab cache. The behavior is controlled by the remote_defrag_ratio of each cache. Strictly speaking this is permitted behavior since __GFP_THISNODE was not specified for the allocation but it is certain surprising. This patch makes sure that the remote defrag behavior only occurs if no node was specified. Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-07-16slub: Use kmem_cache flags to detect if slab is in debugging mode.Christoph Lameter
The cacheline with the flags is reachable from the hot paths after the percpu allocator changes went in. So there is no need anymore to put a flag into each slab page. Get rid of the SlubDebug flag and use the flags in kmem_cache instead. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-07-16slub: Allow removal of slab caches during bootChristoph Lameter
If a slab cache is removed before we have setup sysfs then simply skip over the sysfs handling. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Roland Dreier <rdreier@cisco.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-07-16slub: Check kasprintf results in kmem_cache_init()Christoph Lameter
Small allocations may fail during slab bringup which is fatal. Add a BUG_ON() so that we fail immediately rather than failing later during sysfs processing. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-07-16SLUB: Constants need ULChristoph Lameter
UL suffix is missing in some constants. Conform to how slab.h uses constants. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-07-16slub: Use a constant for a unspecified node.Christoph Lameter
kmalloc_node() and friends can be passed a constant -1 to indicate that no choice was made for the node from which the object needs to come. Use NUMA_NO_NODE instead of -1. CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-06-09Merge branch 'perf/core' of ↵Ingo Molnar
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into perf/core
2010-06-09tracing: Remove kmemtrace ftrace pluginLi Zefan
We have been resisting new ftrace plugins and removing existing ones, and kmemtrace has been superseded by kmem trace events and perf-kmem, so we remove it. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Cc: Ingo Molnar <mingo@elte.hu> Cc: Steven Rostedt <rostedt@goodmis.org> [ remove kmemtrace from the makefile, handle slob too ] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2010-05-30Merge branch 'slub/urgent' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 * 'slub/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: SLUB: Allow full duplication of kmalloc array for 390 slub: move kmem_cache_node into it's own cacheline
2010-05-25cpuset,mm: fix no node to alloc memory when changing cpuset's memsMiao Xie
Before applying this patch, cpuset updates task->mems_allowed and mempolicy by setting all new bits in the nodemask first, and clearing all old unallowed bits later. But in the way, the allocator may find that there is no node to alloc memory. The reason is that cpuset rebinds the task's mempolicy, it cleans the nodes which the allocater can alloc pages on, for example: (mpol: mempolicy) task1 task1's mpol task2 alloc page 1 alloc on node0? NO 1 1 change mems from 1 to 0 1 rebind task1's mpol 0-1 set new bits 0 clear disallowed bits alloc on node1? NO 0 ... can't alloc page goto oom This patch fixes this problem by expanding the nodes range first(set newly allowed bits) and shrink it lazily(clear newly disallowed bits). So we use a variable to tell the write-side task that read-side task is reading nodemask, and the write-side task clears newly disallowed nodes after read-side task ends the current memory allocation. [akpm@linux-foundation.org: fix spello] Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Paul Menage <menage@google.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Ravikiran Thirumalai <kiran@scalex86.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-24slub: move kmem_cache_node into it's own cachelineAlexander Duyck
This patch is meant to improve the performance of SLUB by moving the local kmem_cache_node lock into it's own cacheline separate from kmem_cache. This is accomplished by simply removing the local_node when NUMA is enabled. On my system with 2 nodes I saw around a 5% performance increase w/ hackbench times dropping from 6.2 seconds to 5.9 seconds on average. I suspect the performance gain would increase as the number of nodes increases, but I do not have the data to currently back that up. Bugzilla-Reference: http://bugzilla.kernel.org/show_bug.cgi?id=15713 Cc: <stable@kernel.org> Reported-by: Alex Shi <alex.shi@intel.com> Tested-by: Alex Shi <alex.shi@intel.com> Acked-by: Yanmin Zhang <yanmin_zhang@linux.intel.com> Acked-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-05-22Merge branches 'slab/align', 'slab/cleanups', 'slab/fixes', 'slab/memhotadd' ↵Pekka Enberg
and 'slub/fixes' into slab-for-linus
2010-05-22slub: Use alloc_pages_exact_node() for page allocationMinchan Kim
The alloc_slab_page() in SLUB uses alloc_pages() if node is '-1'. This means that node validity check in alloc_pages_node is unnecessary and we can use alloc_pages_exact_node() to avoid comparison and branch as commit 6484eb3e2a81807722 ("page allocator: do not check NUMA node ID when the caller knows the node is valid") did for the page allocator. Cc: Christoph Lameter <cl@linux-foundation.org> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2010-05-22slub: __kmalloc_node_track_caller should trace kmalloc_large_node caseXiaotian Feng
commit 94b528d (kmemtrace: SLUB hooks for caller-tracking functions) missed tracing kmalloc_large_node in __kmalloc_node_track_caller. We should trace it same as __kmalloc_node. Acked-by: David Rientjes <rientjes@google.com> Cc: Matt Mackall <mpm@selenic.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
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