- 29 12月, 2008 1 次提交
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由 Pekka Enberg 提交于
Commit 6cb06229 ("Categorize GFP flags") left one call-site in alloc_slabmgmt() to clear GFP_THISNODE instead of GFP_CONSTRAINT_MASK. Unfortunately, that ends up clearing __GFP_NOWARN and __GFP_NORETRY as well which is not what we want. As the only caller of alloc_slabmgmt() already clears GFP_CONSTRAINT_MASK before passing local_flags to it, we can just remove the clearing of GFP_THISNODE. This patch should fix spurious page allocation failure warnings on the mempool_alloc() path. See the following URL for the original discussion of the bug: http://lkml.org/lkml/2008/10/27/100Acked-by: NChristoph Lameter <cl@linux-foundation.org> Reported-by: NMiklos Szeredi <miklos@szeredi.hu> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
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- 23 10月, 2008 2 次提交
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由 Alexey Dobriyan 提交于
Lose dummy ->write hook in case of SLUB, it's possible now. Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com> Acked-by: NPekka Enberg <penberg@cs.helsinki.fi>
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由 Alexey Dobriyan 提交于
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com> Acked-by: NPekka Enberg <penberg@cs.helsinki.fi>
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- 30 7月, 2008 1 次提交
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由 Adrian Bunk 提交于
This patch removes the obsolete and no longer used exports of ksize. Signed-off-by: NAdrian Bunk <bunk@kernel.org> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
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- 27 7月, 2008 1 次提交
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由 Alexey Dobriyan 提交于
Kmem cache passed to constructor is only needed for constructors that are themselves multiplexeres. Nobody uses this "feature", nor does anybody uses passed kmem cache in non-trivial way, so pass only pointer to object. Non-trivial places are: arch/powerpc/mm/init_64.c arch/powerpc/mm/hugetlbpage.c This is flag day, yes. Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com> Acked-by: NPekka Enberg <penberg@cs.helsinki.fi> Acked-by: NChristoph Lameter <cl@linux-foundation.org> Cc: Jon Tollefson <kniht@linux.vnet.ibm.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Matt Mackall <mpm@selenic.com> [akpm@linux-foundation.org: fix arch/powerpc/mm/hugetlbpage.c] [akpm@linux-foundation.org: fix mm/slab.c] [akpm@linux-foundation.org: fix ubifs] Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 16 7月, 2008 1 次提交
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由 Rabin Vincent 提交于
With the removal of destructors, slab_destroy_objs no longer actually destroys any objects, making the kernel doc incorrect and the function name misleading. In keeping with the other debug functions, rename it to slab_destroy_debugcheck and drop the kernel doc. Signed-off-by: NRabin Vincent <rabin@rab.in> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
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- 26 6月, 2008 1 次提交
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由 Jens Axboe 提交于
It's not even passed on to smp_call_function() anymore, since that was removed. So kill it. Acked-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Reviewed-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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- 22 6月, 2008 1 次提交
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由 Christoph Lameter 提交于
The zonelist patches caused the loop that checks for available objects in permitted zones to not terminate immediately. One object per zone per allocation may be allocated and then abandoned. Break the loop when we have successfully allocated one object. Signed-off-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 30 4月, 2008 2 次提交
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由 Harvey Harrison 提交于
__FUNCTION__ is gcc-specific, use __func__ Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Thomas Gleixner 提交于
We can see an ever repeating problem pattern with objects of any kind in the kernel: 1) freeing of active objects 2) reinitialization of active objects Both problems can be hard to debug because the crash happens at a point where we have no chance to decode the root cause anymore. One problem spot are kernel timers, where the detection of the problem often happens in interrupt context and usually causes the machine to panic. While working on a timer related bug report I had to hack specialized code into the timer subsystem to get a reasonable hint for the root cause. This debug hack was fine for temporary use, but far from a mergeable solution due to the intrusiveness into the timer code. The code further lacked the ability to detect and report the root cause instantly and keep the system operational. Keeping the system operational is important to get hold of the debug information without special debugging aids like serial consoles and special knowledge of the bug reporter. The problems described above are not restricted to timers, but timers tend to expose it usually in a full system crash. Other objects are less explosive, but the symptoms caused by such mistakes can be even harder to debug. Instead of creating specialized debugging code for the timer subsystem a generic infrastructure is created which allows developers to verify their code and provides an easy to enable debug facility for users in case of trouble. The debugobjects core code keeps track of operations on static and dynamic objects by inserting them into a hashed list and sanity checking them on object operations and provides additional checks whenever kernel memory is freed. The tracked object operations are: - initializing an object - adding an object to a subsystem list - deleting an object from a subsystem list Each operation is sanity checked before the operation is executed and the subsystem specific code can provide a fixup function which allows to prevent the damage of the operation. When the sanity check triggers a warning message and a stack trace is printed. The list of operations can be extended if the need arises. For now it's limited to the requirements of the first user (timers). The core code enqueues the objects into hash buckets. The hash index is generated from the address of the object to simplify the lookup for the check on kfree/vfree. Each bucket has it's own spinlock to avoid contention on a global lock. The debug code can be compiled in without being active. The runtime overhead is minimal and could be optimized by asm alternatives. A kernel command line option enables the debugging code. Thanks to Ingo Molnar for review, suggestions and cleanup patches. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NIngo Molnar <mingo@elte.hu> Cc: Greg KH <greg@kroah.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 28 4月, 2008 4 次提交
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由 Pekka Enberg 提交于
Not all architectures define cache_line_size() so as suggested by Andrew move the private implementations in mm/slab.c and mm/slob.c to <linux/cache.h>. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Reviewed-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Mel Gorman 提交于
Filtering zonelists requires very frequent use of zone_idx(). This is costly as it involves a lookup of another structure and a substraction operation. As the zone_idx is often required, it should be quickly accessible. The node idx could also be stored here if it was found that accessing zone->node is significant which may be the case on workloads where nodemasks are heavily used. This patch introduces a struct zoneref to store a zone pointer and a zone index. The zonelist then consists of an array of these struct zonerefs which are looked up as necessary. Helpers are given for accessing the zone index as well as the node index. [kamezawa.hiroyu@jp.fujitsu.com: Suggested struct zoneref instead of embedding information in pointers] [hugh@veritas.com: mm-have-zonelist: fix memcg ooms] [hugh@veritas.com: just return do_try_to_free_pages] [hugh@veritas.com: do_try_to_free_pages gfp_mask redundant] Signed-off-by: NMel Gorman <mel@csn.ul.ie> Acked-by: NChristoph Lameter <clameter@sgi.com> Acked-by: NDavid Rientjes <rientjes@google.com> Signed-off-by: NLee Schermerhorn <lee.schermerhorn@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <clameter@sgi.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: NHugh Dickins <hugh@veritas.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Mel Gorman 提交于
Currently a node has two sets of zonelists, one for each zone type in the system and a second set for GFP_THISNODE allocations. Based on the zones allowed by a gfp mask, one of these zonelists is selected. All of these zonelists consume memory and occupy cache lines. This patch replaces the multiple zonelists per-node with two zonelists. The first contains all populated zones in the system, ordered by distance, for fallback allocations when the target/preferred node has no free pages. The second contains all populated zones in the node suitable for GFP_THISNODE allocations. An iterator macro is introduced called for_each_zone_zonelist() that interates through each zone allowed by the GFP flags in the selected zonelist. Signed-off-by: NMel Gorman <mel@csn.ul.ie> Acked-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NLee Schermerhorn <lee.schermerhorn@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <clameter@sgi.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Mel Gorman 提交于
Introduce a node_zonelist() helper function. It is used to lookup the appropriate zonelist given a node and a GFP mask. The patch on its own is a cleanup but it helps clarify parts of the two-zonelist-per-node patchset. If necessary, it can be merged with the next patch in this set without problems. Reviewed-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NMel Gorman <mel@csn.ul.ie> Signed-off-by: NLee Schermerhorn <lee.schermerhorn@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <clameter@sgi.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 20 4月, 2008 1 次提交
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由 Mike Travis 提交于
* Use new node_to_cpumask_ptr. This creates a pointer to the cpumask for a given node. This definition is in mm patch: asm-generic-add-node_to_cpumask_ptr-macro.patch * Use new set_cpus_allowed_ptr function. Depends on: [mm-patch]: asm-generic-add-node_to_cpumask_ptr-macro.patch [sched-devel]: sched: add new set_cpus_allowed_ptr function [x86/latest]: x86: add cpus_scnprintf function Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Greg Banks <gnb@melbourne.sgi.com> Cc: H. Peter Anvin <hpa@zytor.com> Signed-off-by: NMike Travis <travis@sgi.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 27 3月, 2008 1 次提交
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由 Daniel Yeisley 提交于
Commit 556a169d ("slab: fix bootstrap on memoryless node") introduced bootstrap-time cache_cache list3s for all nodes but forgot that initkmem_list3 needs to be accessed by [somevalue + node]. This patch fixes list_add() corruption in mm/slab.c seen on the ES7000. Cc: Mel Gorman <mel@csn.ul.ie> Cc: Olaf Hering <olaf@aepfle.de> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: NDan Yeisley <dan.yeisley@unisys.com> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NChristoph Lameter <clameter@sgi.com>
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- 20 3月, 2008 1 次提交
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由 Randy Dunlap 提交于
Fix various kernel-doc notation in mm/: filemap.c: add function short description; convert 2 to kernel-doc fremap.c: change parameter 'prot' to @prot pagewalk.c: change "-" in function parameters to ":" slab.c: fix short description of kmem_ptr_validate() swap.c: fix description & parameters of put_pages_list() swap_state.c: fix function parameters vmalloc.c: change "@returns" to "Returns:" since that is not a parameter Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 07 3月, 2008 3 次提交
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由 Joe Korty 提交于
NUMA slab allocator cpu migration bugfix The NUMA slab allocator (specifically, cache_alloc_refill) is not refreshing its local copies of what cpu and what numa node it is on, when it drops and reacquires the irq block that it inherited from its caller. As a result those values become invalid if an attempt to migrate the process to another numa node occured while the irq block had been dropped. The solution is to make cache_alloc_refill reload these variables whenever it drops and reacquires the irq block. The error is very difficult to hit. When it does occur, one gets the following oops + stack traceback bits in check_spinlock_acquired: kernel BUG at mm/slab.c:2417 cache_alloc_refill+0xe6 kmem_cache_alloc+0xd0 ... This patch was developed against 2.6.23, ported to and compiled-tested only against 2.6.25-rc4. Signed-off-by: NJoe Korty <joe.korty@ccur.com> Signed-off-by: NChristoph Lameter <clameter@sgi.com>
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由 Joe Perches 提交于
Make them all use angle brackets and the directory name. Acked-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NJoe Perches <joe@perches.com> Signed-off-by: NChristoph Lameter <clameter@sgi.com>
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由 Christoph Lameter 提交于
The NUMA fallback logic should be passing local_flags to kmem_get_pages() and not simply the flags passed in. Reviewed-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NChristoph Lameter <clameter@sgi.com>
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- 15 2月, 2008 1 次提交
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由 Marcin Slusarz 提交于
- alloc_slabmgmt: initialize all slab fields in 1 place - slab->nodeid was initialized twice: in alloc_slabmgmt and immediately after it in cache_grow Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com> CC: Christoph Lameter <clameter@sgi.com> Reviewed-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NChristoph Lameter <clameter@sgi.com>
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- 12 2月, 2008 1 次提交
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由 Marcin Slusarz 提交于
- alloc_slabmgmt: initialize all slab fields in 1 place - slab->nodeid was initialized twice: in alloc_slabmgmt and immediately after it in cache_grow Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com> CC: Christoph Lameter <clameter@sgi.com> Reviewed-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NChristoph Lameter <clameter@sgi.com>
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- 26 1月, 2008 2 次提交
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由 Gautham R Shenoy 提交于
This patch converts the known per-subsystem mutexes to get_online_cpus put_online_cpus. It also eliminates the CPU_LOCK_ACQUIRE and CPU_LOCK_RELEASE hotplug notification events. Signed-off-by: NGautham R Shenoy <ego@in.ibm.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Pekka Enberg 提交于
If the node we're booting on doesn't have memory, bootstrapping kmalloc() caches resorts to fallback_alloc() which requires ->nodelists set for all nodes. Fix that by calling set_up_list3s() for CACHE_CACHE in kmem_cache_init(). As kmem_getpages() is called with GFP_THISNODE set, this used to work before because of breakage in 2.6.22 and before with GFP_THISNODE returning pages from the wrong node if a node had no memory. So it may have worked accidentally and in an unsafe manner because the pages would have been associated with the wrong node which could trigger bug ons and locking troubles. Tested-by: NMel Gorman <mel@csn.ul.ie> Tested-by: NOlaf Hering <olaf@aepfle.de> Reviewed-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi> [ With additional one-liner by Olaf Hering - Linus ] Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 25 1月, 2008 1 次提交
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由 Mel Gorman 提交于
Partial revert the changes made by 04231b30 to the kmem_list3 management. On a machine with a memoryless node, this BUG_ON was triggering static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) { struct list_head *entry; struct slab *slabp; struct kmem_list3 *l3; void *obj; int x; l3 = cachep->nodelists[nodeid]; BUG_ON(!l3); Signed-off-by: NMel Gorman <mel@csn.ul.ie> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: NChristoph Lameter <clameter@sgi.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 03 1月, 2008 1 次提交
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由 Linus Torvalds 提交于
Both SLUB and SLAB really did almost exactly the same thing for /proc/slabinfo setup, using duplicate code and per-allocator #ifdef's. This just creates a common CONFIG_SLABINFO that is enabled by both SLUB and SLAB, and shares all the setup code. Maybe SLOB will want this some day too. Reviewed-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 06 12月, 2007 1 次提交
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由 Tetsuo Handa 提交于
mm/slub.c exports ksize(), but mm/slob.c and mm/slab.c don't. It's used by binfmt_flat, which can be built as a module. Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Christoph Lameter <clameter@sgi.com> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 01 12月, 2007 1 次提交
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由 Matthew Wilcox 提交于
The database performance group have found that half the cycles spent in kmem_cache_free are spent in this one call to BUG_ON. Moving it into the CONFIG_SLAB_DEBUG-only function cache_free_debugcheck() is a performance win of almost 0.5% on their particular benchmark. The call was added as part of commit ddc2e812 with the comment that "overhead should be minimal". It may have been minimal at the time, but it isn't now. [ Quoth Pekka Enberg: "I don't think the BUG_ON per se caused the performance regression but rather the virt_to_head_page() changes to virt_to_cache() that were added later." ] Signed-off-by: NMatthew Wilcox <willy@linux.intel.com> Acked-by: NPekka J Enberg <penberg@cs.helsinki.fi> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 15 11月, 2007 1 次提交
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由 Akinobu Mita 提交于
This patch fixes wrong array index in allocation failure handling. Cc: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 20 10月, 2007 1 次提交
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由 Simon Arlott 提交于
Spelling fixes in mm/. Signed-off-by: NSimon Arlott <simon@fire.lp0.eu> Signed-off-by: NAdrian Bunk <bunk@kernel.org>
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- 19 10月, 2007 2 次提交
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由 Akinobu Mita 提交于
This patch fixes memory leak in error path. In reality, we don't need to call cpuup_canceled(cpu) for now. But upcoming cpu hotplug error handling change needs this. Cc: Christoph Lameter <clameter@sgi.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Acked-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Akinobu Mita 提交于
cpuup_callback() is too long. This patch factors out CPU_UP_CANCELLED and CPU_UP_PREPARE handlings from cpuup_callback(). Cc: Christoph Lameter <clameter@sgi.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 17 10月, 2007 6 次提交
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由 Robert P. J. Day 提交于
Since nothing earlier than gcc-3.2 is supported for kernel compilation, that 2.95 hack can be removed. Signed-off-by: NRobert P. J. Day <rpjday@mindspring.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Christoph Lameter 提交于
Slab constructors currently have a flags parameter that is never used. And the order of the arguments is opposite to other slab functions. The object pointer is placed before the kmem_cache pointer. Convert ctor(void *object, struct kmem_cache *s, unsigned long flags) to ctor(struct kmem_cache *s, void *object) throughout the kernel [akpm@linux-foundation.org: coupla fixes] Signed-off-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Mel Gorman 提交于
This patch marks a number of allocations that are either short-lived such as network buffers or are reclaimable such as inode allocations. When something like updatedb is called, long-lived and unmovable kernel allocations tend to be spread throughout the address space which increases fragmentation. This patch groups these allocations together as much as possible by adding a new MIGRATE_TYPE. The MIGRATE_RECLAIMABLE type is for allocations that can be reclaimed on demand, but not moved. i.e. they can be migrated by deleting them and re-reading the information from elsewhere. Signed-off-by: NMel Gorman <mel@csn.ul.ie> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Christoph Lameter 提交于
The function of GFP_LEVEL_MASK seems to be unclear. In order to clear up the mystery we get rid of it and replace GFP_LEVEL_MASK with 3 sets of GFP flags: GFP_RECLAIM_MASK Flags used to control page allocator reclaim behavior. GFP_CONSTRAINT_MASK Flags used to limit where allocations can occur. GFP_SLAB_BUG_MASK Flags that the slab allocator BUG()s on. These replace the uses of GFP_LEVEL mask in the slab allocators and in vmalloc.c. The use of the flags not included in these sets may occur as a result of a slab allocation standing in for a page allocation when constructing scatter gather lists. Extraneous flags are cleared and not passed through to the page allocator. __GFP_MOVABLE/RECLAIMABLE, __GFP_COLD and __GFP_COMP will now be ignored if passed to a slab allocator. Change the allocation of allocator meta data in SLAB and vmalloc to not pass through flags listed in GFP_CONSTRAINT_MASK. SLAB already removes the __GFP_THISNODE flag for such allocations. Generalize that to also cover vmalloc. The use of GFP_CONSTRAINT_MASK also includes __GFP_HARDWALL. The impact of allocator metadata placement on access latency to the cachelines of the object itself is minimal since metadata is only referenced on alloc and free. The attempt is still made to place the meta data optimally but we consistently allow fallback both in SLAB and vmalloc (SLUB does not need to allocate metadata like that). Allocator metadata may serve multiple in kernel users and thus should not be subject to the limitations arising from a single allocation context. [akpm@linux-foundation.org: fix fallback_alloc()] Signed-off-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Christoph Lameter 提交于
Slab should not allocate control structures for nodes without memory. This may seem to work right now but its unreliable since not all allocations can fall back due to the use of GFP_THISNODE. Switching a few for_each_online_node's to N_NORMAL_MEMORY will allow us to only allocate for nodes that have regular memory. Signed-off-by: NChristoph Lameter <clameter@sgi.com> Acked-by: NNishanth Aravamudan <nacc@us.ibm.com> Acked-by: NLee Schermerhorn <lee.schermerhorn@hp.com> Acked-by: NBob Picco <bob.picco@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@skynet.ie> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Christoph Lameter 提交于
A NULL pointer means that the object was not allocated. One cannot determine the size of an object that has not been allocated. Currently we return 0 but we really should BUG() on attempts to determine the size of something nonexistent. krealloc() interprets NULL to mean a zero sized object. Handle that separately in krealloc(). Signed-off-by: NChristoph Lameter <clameter@sgi.com> Acked-by: NPekka Enberg <penberg@cs.helsinki.fi> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 23 8月, 2007 1 次提交
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由 Siddha, Suresh B 提交于
Skip calling cache_free_alien() when the platform is not numa capable. This will avoid cache misses that happen while accessing slabp (which is per page memory reference) to get nodeid. Instead use a global variable to skip the call, which is mostly likely to be present in the cache. This gives a 0.8% performance boost with the database oltp workload on a quad-core SMP platform and by any means the number is not small :) Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com> Acked-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 25 7月, 2007 1 次提交
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由 Andrew Morton 提交于
Use the correct local variable when calling into the page allocator. Local `flags' can have __GFP_ZERO set, which causes us to pass __GFP_ZERO into the page allocator, possibly from illegal contexts. The page allocator will later do prep_zero_page()->kmap_atomic(..., KM_USER0) from irq contexts and will then go BUG. Cc: Mike Galbraith <efault@gmx.de> Acked-by: NChristoph Lameter <clameter@sgi.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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