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2014-10-09mm: optimize put_mems_allowed() usageMel Gorman
commit d26914d11751b23ca2e8747725f2cae10c2f2c1b upstream. Since put_mems_allowed() is strictly optional, its a seqcount retry, we don't need to evaluate the function if the allocation was in fact successful, saving a smp_rmb some loads and comparisons on some relative fast-paths. Since the naming, get/put_mems_allowed() does suggest a mandatory pairing, rename the interface, as suggested by Mel, to resemble the seqcount interface. This gives us: read_mems_allowed_begin() and read_mems_allowed_retry(), where it is important to note that the return value of the latter call is inverted from its previous incarnation. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-10-05mm, slab: initialize object alignment on cache creationDavid Rientjes
commit d4a5fca592b9ab52b90bb261a90af3c8f53be011 upstream. Since commit 4590685546a3 ("mm/sl[aou]b: Common alignment code"), the "ralign" automatic variable in __kmem_cache_create() may be used as uninitialized. The proper alignment defaults to BYTES_PER_WORD and can be overridden by SLAB_RED_ZONE or the alignment specified by the caller. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=85031 Signed-off-by: David Rientjes <rientjes@google.com> Reported-by: Andrei Elovikov <a.elovikov@gmail.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-09slab: fix oops when reading /proc/slab_allocatorsJoonsoo Kim
commit 03787301420376ae41fbaf4267f4a6253d152ac5 upstream. Commit b1cb0982bdd6 ("change the management method of free objects of the slab") introduced a bug on slab leak detector ('/proc/slab_allocators'). This detector works like as following decription. 1. traverse all objects on all the slabs. 2. determine whether it is active or not. 3. if active, print who allocate this object. but that commit changed the way how to manage free objects, so the logic determining whether it is active or not is also changed. In before, we regard object in cpu caches as inactive one, but, with this commit, we mistakenly regard object in cpu caches as active one. This intoduces kernel oops if DEBUG_PAGEALLOC is enabled. If DEBUG_PAGEALLOC is enabled, kernel_map_pages() is used to detect who corrupt free memory in the slab. It unmaps page table mapping if object is free and map it if object is active. When slab leak detector check object in cpu caches, it mistakenly think this object active so try to access object memory to retrieve caller of allocation. At this point, page table mapping to this object doesn't exist, so oops occurs. Following is oops message reported from Dave. It blew up when something tried to read /proc/slab_allocators (Just cat it, and you should see the oops below) Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: [snip...] CPU: 1 PID: 9386 Comm: trinity-c33 Not tainted 3.14.0-rc5+ #131 task: ffff8801aa46e890 ti: ffff880076924000 task.ti: ffff880076924000 RIP: 0010:[<ffffffffaa1a8f4a>] [<ffffffffaa1a8f4a>] handle_slab+0x8a/0x180 RSP: 0018:ffff880076925de0 EFLAGS: 00010002 RAX: 0000000000001000 RBX: 0000000000000000 RCX: 000000005ce85ce7 RDX: ffffea00079be100 RSI: 0000000000001000 RDI: ffff880107458000 RBP: ffff880076925e18 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000000000f R12: ffff8801e6f84000 R13: ffffea00079be100 R14: ffff880107458000 R15: ffff88022bb8d2c0 FS: 00007fb769e45740(0000) GS:ffff88024d040000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8801e6f84ff8 CR3: 00000000a22db000 CR4: 00000000001407e0 DR0: 0000000002695000 DR1: 0000000002695000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000070602 Call Trace: leaks_show+0xce/0x240 seq_read+0x28e/0x490 proc_reg_read+0x3d/0x80 vfs_read+0x9b/0x160 SyS_read+0x58/0xb0 tracesys+0xd4/0xd9 Code: f5 00 00 00 0f 1f 44 00 00 48 63 c8 44 3b 0c 8a 0f 84 e3 00 00 00 83 c0 01 44 39 c0 72 eb 41 f6 47 1a 01 0f 84 e9 00 00 00 89 f0 <4d> 8b 4c 04 f8 4d 85 c9 0f 84 88 00 00 00 49 8b 7e 08 4d 8d 46 RIP handle_slab+0x8a/0x180 To fix the problem, I introduce an object status buffer on each slab. With this, we can track object status precisely, so slab leak detector would not access active object and no kernel oops would occur. Memory overhead caused by this fix is only imposed to CONFIG_DEBUG_SLAB_LEAK which is mainly used for debugging, so memory overhead isn't big problem. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Reported-by: Dave Jones <davej@redhat.com> Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reviewed-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-31mm: Fix warning on make htmldocs caused by slab.cMasanari Iida
This patch fixed following errors while make htmldocs Warning(/mm/slab.c:1956): No description found for parameter 'page' Warning(/mm/slab.c:1956): Excess function parameter 'slabp' description in 'slab_destroy' Incorrect function parameter "slabp" was set instead of "page" Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-11-22Merge branch 'slab/next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux Pull SLAB changes from Pekka Enberg: "The patches from Joonsoo Kim switch mm/slab.c to use 'struct page' for slab internals similar to mm/slub.c. This reduces memory usage and improves performance: https://lkml.org/lkml/2013/10/16/155 Rest of the changes are bug fixes from various people" * 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux: (21 commits) mm, slub: fix the typo in mm/slub.c mm, slub: fix the typo in include/linux/slub_def.h slub: Handle NULL parameter in kmem_cache_flags slab: replace non-existing 'struct freelist *' with 'void *' slab: fix to calm down kmemleak warning slub: proper kmemleak tracking if CONFIG_SLUB_DEBUG disabled slab: rename slab_bufctl to slab_freelist slab: remove useless statement for checking pfmemalloc slab: use struct page for slab management slab: replace free and inuse in struct slab with newly introduced active slab: remove SLAB_LIMIT slab: remove kmem_bufctl_t slab: change the management method of free objects of the slab slab: use __GFP_COMP flag for allocating slab pages slab: use well-defined macro, virt_to_slab() slab: overloading the RCU head over the LRU for RCU free slab: remove cachep in struct slab_rcu slab: remove nodeid in struct slab slab: remove colouroff in struct slab slab: change return type of kmem_getpages() to struct page ...
2013-11-13memcg, kmem: rename cache_from_memcg to cache_from_memcg_idxQiang Huang
We can't see the relationship with memcg from the parameters, so the name with memcg_idx would be more reasonable. Signed-off-by: Qiang Huang <h.huangqiang@huawei.com> Reviewed-by: Pekka Enberg <penberg@kernel.org> Acked-by: David Rientjes <rientjes@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Glauber Costa <glommer@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-10-30slab: replace non-existing 'struct freelist *' with 'void *'Joonsoo Kim
There is no 'strcut freelist', but codes use pointer to 'struct freelist'. Although compiler doesn't complain anything about this wrong usage and codes work fine, but fixing it is better. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-30slab: fix to calm down kmemleak warningJoonsoo Kim
After using struct page as slab management, we should not call kmemleak_scan_area(), since struct page isn't the tracking object of kmemleak. Without this patch and if CONFIG_DEBUG_KMEMLEAK is enabled, so many kmemleak warnings are printed. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: rename slab_bufctl to slab_freelistJoonsoo Kim
Now, bufctl is not proper name to this array. So change it. Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: remove useless statement for checking pfmemallocJoonsoo Kim
Now, virt_to_page(page->s_mem) is same as the page, because slab use this structure for management. So remove useless statement. Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: use struct page for slab managementJoonsoo Kim
Now, there are a few field in struct slab, so we can overload these over struct page. This will save some memory and reduce cache footprint. After this change, slabp_cache and slab_size no longer related to a struct slab, so rename them as freelist_cache and freelist_size. These changes are just mechanical ones and there is no functional change. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: replace free and inuse in struct slab with newly introduced activeJoonsoo Kim
Now, free in struct slab is same meaning as inuse. So, remove both and replace them with active. Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: remove SLAB_LIMITJoonsoo Kim
It's useless now, so remove it. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: remove kmem_bufctl_tJoonsoo Kim
Now, we changed the management method of free objects of the slab and there is no need to use special value, BUFCTL_END, BUFCTL_FREE and BUFCTL_ACTIVE. So remove them. Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: change the management method of free objects of the slabJoonsoo Kim
Current free objects management method of the slab is weird, because it touch random position of the array of kmem_bufctl_t when we try to get free object. See following example. struct slab's free = 6 kmem_bufctl_t array: 1 END 5 7 0 4 3 2 To get free objects, we access this array with following pattern. 6 -> 3 -> 7 -> 2 -> 5 -> 4 -> 0 -> 1 -> END If we have many objects, this array would be larger and be not in the same cache line. It is not good for performance. We can do same thing through more easy way, like as the stack. Only thing we have to do is to maintain stack top to free object. I use free field of struct slab for this purpose. After that, if we need to get an object, we can get it at stack top and manipulate top pointer. That's all. This method already used in array_cache management. Following is an access pattern when we use this method. struct slab's free = 0 kmem_bufctl_t array: 6 3 7 2 5 4 0 1 To get free objects, we access this array with following pattern. 0 -> 1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 This may help cache line footprint if slab has many objects, and, in addition, this makes code much much simpler. Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: use __GFP_COMP flag for allocating slab pagesJoonsoo Kim
If we use 'struct page' of first page as 'struct slab', there is no advantage not to use __GFP_COMP. So use __GFP_COMP flag for all the cases. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: use well-defined macro, virt_to_slab()Joonsoo Kim
This is trivial change, just use well-defined macro. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: overloading the RCU head over the LRU for RCU freeJoonsoo Kim
With build-time size checking, we can overload the RCU head over the LRU of struct page to free pages of a slab in rcu context. This really help to implement to overload the struct slab over the struct page and this eventually reduce memory usage and cache footprint of the SLAB. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: remove cachep in struct slab_rcuJoonsoo Kim
We can get cachep using page in struct slab_rcu, so remove it. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: remove nodeid in struct slabJoonsoo Kim
We can get nodeid using address translation, so this field is not useful. Therefore, remove it. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: remove colouroff in struct slabJoonsoo Kim
Now there is no user colouroff, so remove it. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: change return type of kmem_getpages() to struct pageJoonsoo Kim
It is more understandable that kmem_getpages() return struct page. And, with this, we can reduce one translation from virt addr to page and makes better code than before. Below is a change of this patch. * Before text data bss dec hex filename 22123 23434 4 45561 b1f9 mm/slab.o * After text data bss dec hex filename 22074 23434 4 45512 b1c8 mm/slab.o And this help following patch to remove struct slab's colouroff. Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-10-24slab: correct pfmemalloc checkJoonsoo Kim
We checked pfmemalloc by slab unit, not page unit. You can see this in is_slab_pfmemalloc(). So other pages don't need to be set/cleared pfmemalloc. And, therefore we should check pfmemalloc in page flag of first page, but current implementation don't do that. virt_to_head_page(obj) just return 'struct page' of that object, not one of first page, since the SLAB don't use __GFP_COMP when CONFIG_MMU. To get 'struct page' of first page, we first get a slab and try to get it via virt_to_head_page(slab->s_mem). Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Pekka Enberg <penberg@iki.fi>
2013-07-14kernel: delete __cpuinit usage from all core kernel filesPaul Gortmaker
The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. This removes all the uses of the __cpuinit macros from C files in the core kernel directories (kernel, init, lib, mm, and include) that don't really have a specific maintainer. [1] https://lkml.org/lkml/2013/5/20/589 Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-07-14Merge branch 'slab/for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux Pull slab update from Pekka Enberg: "Highlights: - Fix for boot-time problems on some architectures due to init_lock_keys() not respecting kmalloc_caches boundaries (Christoph Lameter) - CONFIG_SLUB_CPU_PARTIAL requested by RT folks (Joonsoo Kim) - Fix for excessive slab freelist draining (Wanpeng Li) - SLUB and SLOB cleanups and fixes (various people)" I ended up editing the branch, and this avoids two commits at the end that were immediately reverted, and I instead just applied the oneliner fix in between myself. * 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux slub: Check for page NULL before doing the node_match check mm/slab: Give s_next and s_stop slab-specific names slob: Check for NULL pointer before calling ctor() slub: Make cpu partial slab support configurable slab: add kmalloc() to kernel API documentation slab: fix init_lock_keys slob: use DIV_ROUND_UP where possible slub: do not put a slab to cpu partial list when cpu_partial is 0 mm/slub: Use node_nr_slabs and node_nr_objs in get_slabinfo mm/slub: Drop unnecessary nr_partials mm/slab: Fix /proc/slabinfo unwriteable for slab mm/slab: Sharing s_next and s_stop between slab and slub mm/slab: Fix drain freelist excessively slob: Rework #ifdeffery in slab.h mm, slab: moved kmem_cache_alloc_node comment to correct place
2013-07-08mm/slab: Give s_next and s_stop slab-specific namesWanpeng Li
Give s_next and s_stop slab-specific names instead of exporting "s_next" and "s_stop". Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-07-07slab: fix init_lock_keysChristoph Lameter
Some architectures (e.g. powerpc built with CONFIG_PPC_256K_PAGES=y CONFIG_FORCE_MAX_ZONEORDER=11) get PAGE_SHIFT + MAX_ORDER > 26. In 3.10 kernels, CONFIG_LOCKDEP=y with PAGE_SHIFT + MAX_ORDER > 26 makes init_lock_keys() dereference beyond kmalloc_caches[26]. This leads to an unbootable system (kernel panic at initializing SLAB) if one of kmalloc_caches[26...PAGE_SHIFT+MAX_ORDER-1] is not NULL. Fix this by making sure that init_lock_keys() does not dereference beyond kmalloc_caches[26] arrays. Signed-off-by: Christoph Lameter <cl@linux.com> Reported-by: Tetsuo Handa <penguin-kernel@I-Love.SAKURA.ne.jp> Cc: Pekka Enberg <penberg@kernel.org> Cc: <stable@vger.kernel.org> [3.10.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-07-07mm/slab: Sharing s_next and s_stop between slab and slubWanpeng Li
This patch shares s_next and s_stop between slab and slub. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-07-07mm/slab: Fix drain freelist excessivelyWanpeng Li
The drain_freelist is called to drain slabs_free lists for cache reap, cache shrink, memory hotplug callback etc. The tofree parameter should be the number of slab to free instead of the number of slab objects to free. This patch fix the callers that pass # of objects. Make sure they pass # of slabs. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-06-08mm, slab: moved kmem_cache_alloc_node comment to correct placeZhouping Liu
After several fixing about kmem_cache_alloc_node(), its comment was splitted. This patch moved it on top of kmem_cache_alloc_node() definition. Signed-off-by: Zhouping Liu <zliu@redhat.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-05-07Merge branch 'slab/for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux Pull slab changes from Pekka Enberg: "The bulk of the changes are more slab unification from Christoph. There's also few fixes from Aaron, Glauber, and Joonsoo thrown into the mix." * 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux: (24 commits) mm, slab_common: Fix bootstrap creation of kmalloc caches slab: Return NULL for oversized allocations mm: slab: Verify the nodeid passed to ____cache_alloc_node slub: tid must be retrieved from the percpu area of the current processor slub: Do not dereference NULL pointer in node_match slub: add 'likely' macro to inc_slabs_node() slub: correct to calculate num of acquired objects in get_partial_node() slub: correctly bootstrap boot caches mm/sl[au]b: correct allocation type check in kmalloc_slab() slab: Fixup CONFIG_PAGE_ALLOC/DEBUG_SLAB_LEAK sections slab: Handle ARCH_DMA_MINALIGN correctly slab: Common definition for kmem_cache_node slab: Rename list3/l3 to node slab: Common Kmalloc cache determination stat: Use size_t for sizes instead of unsigned slab: Common function to create the kmalloc array slab: Common definition for the array of kmalloc caches slab: Common constants for kmalloc boundaries slab: Rename nodelists to node slab: Common name for the per node structures ...
2013-05-07Merge branch 'slab/next' into slab/for-linusPekka Enberg
2013-05-01mm: slab: Verify the nodeid passed to ____cache_alloc_nodeAaron Tomlin
If the nodeid is > num_online_nodes() this can cause an Oops and a panic(). The purpose of this patch is to assert if this condition is true to aid debugging efforts rather than some random NULL pointer dereference or page fault. This patch is in response to BZ#42967 [1]. Using VM_BUG_ON so it's used only when CONFIG_DEBUG_VM is set, given that ____cache_alloc_node() is a hot code path. [1]: https://bugzilla.kernel.org/show_bug.cgi?id=42967 Signed-off-by: Aaron Tomlin <atomlin@redhat.com> Reviewed-by: Rik van Riel <riel@redhat.com> Acked-by: Christoph Lameter <cl@linux.com> Acked-by: Rafael Aquini <aquini@redhat.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-04-29mm: Convert print_symbol to %pSRJoe Perches
Use the new vsprintf extension to avoid any possible message interleaving. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2013-02-06slab: Fixup CONFIG_PAGE_ALLOC/DEBUG_SLAB_LEAK sectionsChristoph Lameter
Variables were not properly converted and the conversion caused a naming conflict. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Common definition for kmem_cache_nodeChristoph Lameter
Put the definitions for the kmem_cache_node structures together so that we have one structure. That will allow us to create more common fields in the future which could yield more opportunities to share code. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Rename list3/l3 to nodeChristoph Lameter
The list3 or l3 pointers are pointing to per node structures. Reflect that in the names of variables used. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Common Kmalloc cache determinationChristoph Lameter
Extract the optimized lookup functions from slub and put them into slab_common.c. Then make slab use these functions as well. Joonsoo notes that this fixes some issues with constant folding which also reduces the code size for slub. https://lkml.org/lkml/2012/10/20/82 Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Common function to create the kmalloc arrayChristoph Lameter
The kmalloc array is created in similar ways in both SLAB and SLUB. Create a common function and have both allocators call that function. V1->V2: Whitespace cleanup Reviewed-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Common definition for the array of kmalloc cachesChristoph Lameter
Have a common definition fo the kmalloc cache arrays in SLAB and SLUB Acked-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Rename nodelists to nodeChristoph Lameter
Have a common naming between both slab caches for future changes. Acked-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Common name for the per node structuresChristoph Lameter
Rename the structure used for the per node structures in slab to have a name that expresses that fact. Acked-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-02-01slab: Use common kmalloc_index/kmalloc_size functionsChristoph Lameter
Make slab use the common functions. We can get rid of a lot of old ugly stuff as a results. Among them the sizes array and the weird include/linux/kmalloc_sizes file and some pretty bad #include statements in slab_def.h. The one thing that is different in slab is that the 32 byte cache will also be created for arches that have page sizes larger than 4K. There are numerous smaller allocations that SLOB and SLUB can handle better because of their support for smaller allocation sizes so lets keep the 32 byte slab also for arches with > 4K pages. Reviewed-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2013-01-21taint: add explicit flag to show whether lock dep is still OK.Rusty Russell
Fix up all callers as they were before, with make one change: an unsigned module taints the kernel, but doesn't turn off lockdep. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-12-18memcg: add comments clarifying aspects of cache attribute propagationGlauber Costa
This patch clarifies two aspects of cache attribute propagation. First, the expected context for the for_each_memcg_cache macro in memcontrol.h. The usages already in the codebase are safe. In mm/slub.c, it is trivially safe because the lock is acquired right before the loop. In mm/slab.c, it is less so: the lock is acquired by an outer function a few steps back in the stack, so a VM_BUG_ON() is added to make sure it is indeed safe. A comment is also added to detail why we are returning the value of the parent cache and ignoring the children's when we propagate the attributes. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18slab: propagate tunable valuesGlauber Costa
SLAB allows us to tune a particular cache behavior with tunables. When creating a new memcg cache copy, we'd like to preserve any tunables the parent cache already had. This could be done by an explicit call to do_tune_cpucache() after the cache is created. But this is not very convenient now that the caches are created from common code, since this function is SLAB-specific. Another method of doing that is taking advantage of the fact that do_tune_cpucache() is always called from enable_cpucache(), which is called at cache initialization. We can just preset the values, and then things work as expected. It can also happen that a root cache has its tunables updated during normal system operation. In this case, we will propagate the change to all caches that are already active. This change will require us to move the assignment of root_cache in memcg_params a bit earlier. We need this to be already set - which memcg_kmem_register_cache will do - when we reach __kmem_cache_create() Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Frederic Weisbecker <fweisbec@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: JoonSoo Kim <js1304@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michal Hocko <mhocko@suse.cz> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Rik van Riel <riel@redhat.com> Cc: Suleiman Souhlal <suleiman@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18memcg: destroy memcg cachesGlauber Costa
Implement destruction of memcg caches. Right now, only caches where our reference counter is the last remaining are deleted. If there are any other reference counters around, we just leave the caches lying around until they go away. When that happens, a destruction function is called from the cache code. Caches are only destroyed in process context, so we queue them up for later processing in the general case. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Frederic Weisbecker <fweisbec@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: JoonSoo Kim <js1304@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michal Hocko <mhocko@suse.cz> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Rik van Riel <riel@redhat.com> Cc: Suleiman Souhlal <suleiman@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18sl[au]b: allocate objects from memcg cacheGlauber Costa
We are able to match a cache allocation to a particular memcg. If the task doesn't change groups during the allocation itself - a rare event, this will give us a good picture about who is the first group to touch a cache page. This patch uses the now available infrastructure by calling memcg_kmem_get_cache() before all the cache allocations. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Frederic Weisbecker <fweisbec@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: JoonSoo Kim <js1304@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michal Hocko <mhocko@suse.cz> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Rik van Riel <riel@redhat.com> Cc: Suleiman Souhlal <suleiman@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18sl[au]b: always get the cache from its page in kmem_cache_free()Glauber Costa
struct page already has this information. If we start chaining caches, this information will always be more trustworthy than whatever is passed into the function. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Frederic Weisbecker <fweisbec@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: JoonSoo Kim <js1304@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michal Hocko <mhocko@suse.cz> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Rik van Riel <riel@redhat.com> Cc: Suleiman Souhlal <suleiman@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-18slab: annotate on-slab caches nodelist locksGlauber Costa
We currently provide lockdep annotation for kmalloc caches, and also caches that have SLAB_DEBUG_OBJECTS enabled. The reason for this is that we can quite frequently nest in the l3->list_lock lock, which is not something trivial to avoid. My proposal with this patch, is to extend this to caches whose slab management object lives within the slab as well ("on_slab"). The need for this arose in the context of testing kmemcg-slab patches. With such patchset, we can have per-memcg kmalloc caches. So the same path that led to nesting between kmalloc caches will could then lead to in-memcg nesting. Because they are not annotated, lockdep will trigger. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Frederic Weisbecker <fweisbec@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: JoonSoo Kim <js1304@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michal Hocko <mhocko@suse.cz> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Rik van Riel <riel@redhat.com> Cc: Suleiman Souhlal <suleiman@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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