- 25 May, 2011 40 commits
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Matt Fleming authored
The problem with having two different types of counters is that developers adding new code need to keep in mind whether it's safe to use both the atomic and non-atomic implementations. For example, when adding new callers of the *_mm_counter() functions a developer needs to ensure that those paths are always executed with page_table_lock held, in case we're using the non-atomic implementation of mm counters. Hugh Dickins introduced the atomic mm counters in commit f412ac08 ("[PATCH] mm: fix rss and mmlist locking"). When asked why he left the non-atomic counters around he said, | The only reason was to avoid adding costly atomic operations into a | configuration that had no need for them there: the page_table_lock | sufficed. | | Certainly it would be simpler just to delete the non-atomic variant. | | And I think it's fair to say that any configuration on which we're | measuring performance to that degree (rather than "does it boot fast?" | type measurements), would already be going the split ptlocks route. Removing the non-atomic counters eases the maintenance burden because developers no longer have to mindful of the two implementations when using *_mm_counter(). Note that all architectures provide a means of atomically updating atomic_long_t variables, even if they have to revert to the generic spinlock implementation because they don't support 64-bit atomic instructions (see lib/atomic64.c). Signed-off-by:
Matt Fleming <matt.fleming@linux.intel.com> Acked-by:
Dave Hansen <dave@linux.vnet.ibm.com> Acked-by:
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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David Rientjes authored
The page allocator will improperly return a page from ZONE_NORMAL even when __GFP_DMA is passed if CONFIG_ZONE_DMA is disabled. The caller expects DMA memory, perhaps for ISA devices with 16-bit address registers, and may get higher memory resulting in undefined behavior. This patch causes the page allocator to return NULL in such circumstances with a warning emitted to the kernel log on the first occurrence. Signed-off-by:
David Rientjes <rientjes@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by:
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Daniel Kiper authored
Do not define PFN_SECTION_SHIFT if !CONFIG_SPARSEMEM. Signed-off-by:
Daniel Kiper <dkiper@net-space.pl> Acked-by:
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Daniel Kiper authored
pfn_to_section_nr()/section_nr_to_pfn() is valid only in CONFIG_SPARSEMEM context. Move it to proper place. Signed-off-by:
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Daniel Kiper authored
set_page_section() is meaningful only in CONFIG_SPARSEMEM and !CONFIG_SPARSEMEM_VMEMMAP context. Move it to proper place and amend accordingly functions which are using it. Signed-off-by:
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Daniel Kiper authored
online_pages() is only compiled for CONFIG_MEMORY_HOTPLUG_SPARSE, so there is no need to support CONFIG_FLATMEM code within it. This patch removes code that is never used. Signed-off-by:
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Minchan Kim authored
It's pointless that deactive_page's operates on unevictable pages. This patch removes unnecessary overhead which might be a bit problem in case that there are many unevictable page in system(ex, mprotect workload) [akpm@linux-foundation.org: tidy up comment] Reviewed-by:
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by:
Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Rik van Riel<riel@redhat.com> Signed-off-by:
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Wu Fengguang authored
Previously the mmap sequential readahead is triggered by updating ra->prev_pos on each page fault and compare it with current page offset. It costs dirtying the cache line on each _minor_ page fault. So remove the ra->prev_pos recording, and instead tag PG_readahead to trigger the possible sequential readahead. It's not only more simple, but also will work more reliably and reduce cache line bouncing on concurrent page faults on shared struct file. In the mosbench exim benchmark which does multi-threaded page faults on shared struct file, the ra->mmap_miss and ra->prev_pos updates are found to cause excessive cache line bouncing on tmpfs, which actually disabled readahead totally (shmem_backing_dev_info.ra_pages == 0). So remove the ra->prev_pos recording, and instead tag PG_readahead to trigger the possible sequential readahead. It's not only more simple, but also will work more reliably on concurrent reads on shared struct file. Signed-off-by:
Wu Fengguang <fengguang.wu@intel.com> Tested-by:
Tim Chen <tim.c.chen@intel.com> Reported-by:
Andi Kleen <ak@linux.intel.com> Signed-off-by:
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Andi Kleen authored
The original INT_MAX is too large, reduce it to - avoid unnecessarily dirtying/bouncing the cache line - restore mmap read-around faster on changed access pattern Background: in the mosbench exim benchmark which does multi-threaded page faults on shared struct file, the ra->mmap_miss updates are found to cause excessive cache line bouncing on tmpfs. The ra state updates are needless for tmpfs because it actually disabled readahead totally (shmem_backing_dev_info.ra_pages == 0). Tested-by:
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Wu Fengguang authored
Reduce readahead overheads by returning early in do_sync_mmap_readahead(). tmpfs has ra_pages=0 and it can page fault really fast (not constraint by IO if not swapping). Signed-off-by:
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Ying Han authored
Change each shrinker's API by consolidating the existing parameters into shrink_control struct. This will simplify any further features added w/o touching each file of shrinker. [akpm@linux-foundation.org: fix build] [akpm@linux-foundation.org: fix warning] [kosaki.motohiro@jp.fujitsu.com: fix up new shrinker API] [akpm@linux-foundation.org: fix xfs warning] [akpm@linux-foundation.org: update gfs2] Signed-off-by:
Ying Han <yinghan@google.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Minchan Kim <minchan.kim@gmail.com> Acked-by:
Pavel Emelyanov <xemul@openvz.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Acked-by:
Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by:
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Ying Han authored
Consolidate the existing parameters to shrink_slab() into a new shrink_control struct. This is needed later to pass the same struct to shrinkers. Signed-off-by:
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Wu Fengguang authored
Pass __GFP_NORETRY|__GFP_NOWARN for readahead page allocations. readahead page allocations are completely optional. They are OK to fail and in particular shall not trigger OOM on themselves. Reported-by:
Dave Young <hidave.darkstar@gmail.com> Reviewed-by:
Pekka Enberg <penberg@kernel.org> Signed-off-by:
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Arve Hjønnevåg authored
This fixes a problem where the first pageblock got marked MIGRATE_RESERVE even though it only had a few free pages. eg, On current ARM port, The kernel starts at offset 0x8000 to leave room for boot parameters, and the memory is freed later. This in turn caused no contiguous memory to be reserved and frequent kswapd wakeups that emptied the caches to get more contiguous memory. Unfortunatelly, ARM needs order-2 allocation for pgd (see arm/mm/pgd.c#pgd_alloc()). Therefore the issue is not minor nor easy avoidable. [kosaki.motohiro@jp.fujitsu.com: added some explanation] [kosaki.motohiro@jp.fujitsu.com: add !pfn_valid_within() to check] [minchan.kim@gmail.com: check end_pfn in pageblock_is_reserved] Signed-off-by:
John Stultz <john.stultz@linaro.org> Signed-off-by:
Arve Hjønnevåg <arve@android.com> Signed-off-by:
Mel Gorman <mel@csn.ul.ie> Acked-by:
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David Rientjes authored
For m32r, N_NORMAL_MEMORY represents all nodes that have present memory since it does not support HIGHMEM. This patch sets the bit at the time the node is initialized. If N_NORMAL_MEMORY is not accurate, slub may encounter errors since it uses this nodemask to setup per-cache kmem_cache_node data structures. Signed-off-by:
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David Rientjes authored
For alpha, N_NORMAL_MEMORY represents all nodes that have present memory since it does not support HIGHMEM. This patch sets the bit at the time the node is initialized. If N_NORMAL_MEMORY is not accurate, slub may encounter errors since it uses this nodemask to setup per-cache kmem_cache_node data structures. Signed-off-by:
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Konstantin Khlebnikov authored
isolate_lru_page() must be called only with stable reference to the page, this is what is written in the comment above it, this is reasonable. current isolate_lru_page() users and its page extra reference sources: mm/huge_memory.c: __collapse_huge_page_isolate() - reference from pte mm/memcontrol.c: mem_cgroup_move_parent() - get_page_unless_zero() mem_cgroup_move_charge_pte_range() - reference from pte mm/memory-failure.c: soft_offline_page() - fixed, reference from get_any_page() delete_from_lru_cache() - reference from caller or get_page_unless_zero() [ seems like there bug, because __memory_failure() can call page_action() for hpages tail, but it is ok for isolate_lru_page(), tail getted and not in lru] mm/memory_hotplug.c: do_migrate_range() - fixed, get_page_unless_zero() mm/mempolicy.c: migrate_page_add() - reference from pte mm/migrate.c: do_move_page_to_node_array() - reference from follow_page() mlock.c: - various external references mm/vmscan.c: putback_lru_page() - reference from isolate_lru_page() It seems that all isolate_lru_page() users are ready now for this restriction. So, let's replace redundant get_page_unless_zero() with get_page() and add page initial reference count check with VM_BUG_ON() Signed-off-by:
Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by:
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Konstantin Khlebnikov authored
Drop first page reference only after calling isolate_lru_page() to keep page stable reference while isolating. Signed-off-by:
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Konstantin Khlebnikov authored
isolate_lru_page() must be called only with stable reference to page. So, let's grab normal page reference. Signed-off-by:
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Dave Hansen authored
I was tracking down a page allocation failure that ended up in vmalloc(). Since vmalloc() uses 0-order pages, if somebody asks for an insane amount of memory, we'll still get a warning with "order:0" in it. That's not very useful. During recovery, vmalloc() also nicely frees all of the memory that it got up to the point of the failure. That is wonderful, but it also quickly hides any issues. We have a much different sitation if vmalloc() repeatedly fails 10GB in to: vmalloc(100 * 1<<30); versus repeatedly failing 4096 bytes in to a: vmalloc(8192); This patch will print out messages that look like this: [ 68.123503] vmalloc: allocation failure, allocated 6680576 of 13426688 bytes [ 68.124218] bash: page allocation failure: order:0, mode:0xd2 [ 68.124811] Pid: 3770, comm: bash Not tainted 2.6.39-rc3-00082-g85f2e689-dirty #333 [ 68.125579] Call Trace: [ 68.125853] [<ffffffff810f6da6>] warn_alloc_failed+0x146/0x170 [ 68.126464] [<ffffffff8107e05c>] ? printk+0x6c/0x70 [ 68.126791] [<ffffffff8112b5d4>] ? alloc_pages_current+0x94/0xe0 [ 68.127661] [<ffffffff8111ed37>] __vmalloc_node_range+0x237/0x290 ... The 'order' variable is added for clarity when calling warn_alloc_failed() to avoid having an unexplained '0' as an argument. The 'tmp_mask' is because adding an open-coded '| __GFP_NOWARN' would take us over 80 columns for the alloc_pages_node() call. If we are going to add a line, it might as well be one that makes the sucker easier to read. As a side issue, I also noticed that ctl_ioctl() does vmalloc() based solely on an unverified value passed in from userspace. Granted, it's under CAP_SYS_ADMIN, but it still frightens me a bit. Signed-off-by:
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Dave Hansen authored
This originally started as a simple patch to give vmalloc() some more verbose output on failure on top of the plain page allocator messages. Johannes suggested that it might be nicer to lead with the vmalloc() info _before_ the page allocator messages. But, I do think there's a lot of value in what __alloc_pages_slowpath() does with its filtering and so forth. This patch creates a new function which other allocators can call instead of relying on the internal page allocator warnings. It also gives this function private rate-limiting which separates it from other printk_ratelimit() users. Signed-off-by:
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KOSAKI Motohiro authored
cpumask_t is very big struct and cpu_vm_mask is placed wrong position. It might lead to reduce cache hit ratio. This patch has two change. 1) Move the place of cpumask into last of mm_struct. Because usually cpumask is accessed only front bits when the system has cpu-hotplug capability 2) Convert cpu_vm_mask into cpumask_var_t. It may help to reduce memory footprint if cpumask_size() will use nr_cpumask_bits properly in future. In addition, this patch change the name of cpu_vm_mask with cpu_vm_mask_var. It may help to detect out of tree cpu_vm_mask users. This patch has no functional change. [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
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Andrea Arcangeli authored
We don't need to hold the mmmap_sem through mem_cgroup_newpage_charge(), the mmap_sem is only hold for keeping the vma stable and we don't need the vma stable anymore after we return from alloc_hugepage_vma(). Signed-off-by:
Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <jweiner@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: David Rientjes <rientjes@google.com> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by:
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Peter Zijlstra authored
Some of these functions have grown beyond inline sanity, move them out-of-line. Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Requested-by:
Hugh Dickins <hughd@google.com> Signed-off-by:
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Peter Zijlstra authored
Optimize the page_lock_anon_vma() fast path to be one atomic op, instead of two. Signed-off-by:
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Peter Zijlstra authored
Straightforward conversion of anon_vma->lock to a mutex. Signed-off-by:
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Peter Zijlstra authored
Convert page_lock_anon_vma() over to use refcounts. This is done to prepare for the conversion of anon_vma from spinlock to mutex. Sadly this inceases the cost of page_lock_anon_vma() from one to two atomics, a follow up patch addresses this, lets keep that simple for now. Signed-off-by:
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Peter Zijlstra authored
A slightly more verbose comment to go along with the trickery in page_lock_anon_vma(). Signed-off-by:
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Peter Zijlstra authored
Its beyond ugly and gets in the way. Signed-off-by:
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Peter Zijlstra authored
Straightforward conversion of i_mmap_lock to a mutex. Signed-off-by:
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Peter Zijlstra authored
Hugh says: "The only significant loser, I think, would be page reclaim (when concurrent with truncation): could spin for a long time waiting for the i_mmap_mutex it expects would soon be dropped? " Counter points: - cpu contention makes the spin stop (need_resched()) - zap pages should be freeing pages at a higher rate than reclaim ever can I think the simplification of the truncate code is definitely worth it. Effectively reverts: 2aa15890 ("mm: prevent concurrent unmap_mapping_range() on the same inode") and takes out the code that caused its problem. Signed-off-by:
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Peter Zijlstra authored
In order to convert i_mmap_lock to a mutex we need a mutex equivalent to spin_lock_nest_lock(), thus provide the mutex_lock_nest_lock() annotation. As with spin_lock_nest_lock(), mutex_lock_nest_lock() allows annotation of the locking pattern where an outer lock serializes the acquisition order of nested locks. That is, if every time you lock multiple locks A, say A1 and A2 you first acquire N, the order of acquiring A1 and A2 is irrelevant. Signed-off-by:
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Peter Zijlstra authored
Instead of using a single batch (the small on-stack, or an allocated page), try and extend the batch every time it runs out and only flush once either the extend fails or we're done. Signed-off-by:
Nick Piggin <npiggin@kernel.dk> Reviewed-by:
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Peter Zijlstra authored
In case other architectures require RCU freed page-tables to implement gup_fast() and software filled hashes and similar things, provide the means to do so by moving the logic into generic code. Signed-off-by:
David Miller <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Tony Luck <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by:
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Peter Zijlstra authored
Fold all the mmu_gather rework patches into one for submission Signed-off-by:
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Peter Zijlstra authored
Fix up the um mmu_gather code to conform to the new API. Signed-off-by:
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Peter Zijlstra authored
Fix up the ia64 mmu_gather code to conform to the new API. Signed-off-by:
Tony Luck <tony.luck@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Miller <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by:
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Peter Zijlstra authored
Fix up the sh mmu_gather code to conform to the new API. Signed-off-by:
Paul Mundt <lethal@linux-sh.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Miller <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Tony Luck <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by:
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Peter Zijlstra authored
Fix up the arm mmu_gather code to conform to the new API. Signed-off-by:
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Peter Zijlstra authored
Adapt the stand-alone s390 mmu_gather implementation to the new preemptible mmu_gather interface. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Miller <davem@davemloft.net> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Tony Luck <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by:
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