- 31 10月, 2012 3 次提交
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由 Ezequiel Garcia 提交于
This function is identically defined in all three allocators and it's trivial to move it to slab.h Since now it's static, inline, header-defined function this patch also drops the EXPORT_SYMBOL tag. Cc: Pekka Enberg <penberg@kernel.org> Cc: Matt Mackall <mpm@selenic.com> Acked-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NEzequiel Garcia <elezegarcia@gmail.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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由 Ezequiel Garcia 提交于
Fields object_size and size are not the same: the latter might include slab metadata. Return object_size field in kmem_cache_size(). Also, improve trace accuracy by correctly tracing reported size. Cc: Pekka Enberg <penberg@kernel.org> Cc: Matt Mackall <mpm@selenic.com> Acked-by: NChristoph Lameter <cl@linux.com> Acked-by: NDavid Rientjes <rientjes@google.com> Signed-off-by: NEzequiel Garcia <elezegarcia@gmail.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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由 Ezequiel Garcia 提交于
This field was being used to store size allocation so it could be retrieved by ksize(). However, it is a bad practice to not mark a page as a slab page and then use fields for special purposes. There is no need to store the allocated size and ksize() can simply return PAGE_SIZE << compound_order(page). Cc: Pekka Enberg <penberg@kernel.org> Cc: Matt Mackall <mpm@selenic.com> Acked-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NEzequiel Garcia <elezegarcia@gmail.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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- 24 10月, 2012 4 次提交
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由 Glauber Costa 提交于
Right now, slab and slub have fields in struct page to derive which cache a page belongs to, but they do it slightly differently. slab uses a field called slab_cache, that lives in the third double word. slub, uses a field called "slab", living outside of the doublewords area. Ideally, we could use the same field for this. Since slub heavily makes use of the doubleword region, there isn't really much room to move slub's slab_cache field around. Since slab does not have such strict placement restrictions, we can move it outside the doubleword area. The naming used by slab, "slab_cache", is less confusing, and it is preferred over slub's generic "slab". Signed-off-by: NGlauber Costa <glommer@parallels.com> Acked-by: NChristoph Lameter <cl@linux.com> CC: David Rientjes <rientjes@google.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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由 Glauber Costa 提交于
With all the infrastructure in place, we can now have slabinfo_show done from slab_common.c. A cache-specific function is called to grab information about the cache itself, since that is still heavily dependent on the implementation. But with the values produced by it, all the printing and handling is done from common code. Signed-off-by: NGlauber Costa <glommer@parallels.com> CC: Christoph Lameter <cl@linux.com> CC: David Rientjes <rientjes@google.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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由 Glauber Costa 提交于
The header format is highly similar between slab and slub. The main difference lays in the fact that slab may optionally have statistics added here in case of CONFIG_SLAB_DEBUG, while the slub will stick them somewhere else. By making sure that information conditionally lives inside a globally-visible CONFIG_DEBUG_SLAB switch, we can move the header printing to a common location. Signed-off-by: NGlauber Costa <glommer@parallels.com> Acked-by: NChristoph Lameter <cl@linux.com> CC: David Rientjes <rientjes@google.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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由 Glauber Costa 提交于
This patch moves all the common machinery to slabinfo processing to slab_common.c. We can do better by noticing that the output is heavily common, and having the allocators to just provide finished information about this. But after this first step, this can be done easier. Signed-off-by: NGlauber Costa <glommer@parallels.com> Acked-by: NChristoph Lameter <cl@linux.com> CC: David Rientjes <rientjes@google.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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- 19 10月, 2012 1 次提交
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由 Joonsoo Kim 提交于
When we try to free object, there is some of case that we need to take a node lock. This is the necessary step for preventing a race. After taking a lock, then we try to cmpxchg_double_slab(). But, there is a possible scenario that cmpxchg_double_slab() is failed with taking a lock. Following example explains it. CPU A CPU B need lock ... need lock ... lock!! lock..but spin free success spin... unlock lock!! free fail In this case, retry with taking a lock is occured in CPU A. I think that in this case for CPU A, "release a lock first, and re-take a lock if necessary" is preferable way. There are two reasons for this. First, this makes __slab_free()'s logic somehow simple. With this patch, 'was_frozen = 1' is "always" handled without taking a lock. So we can remove one code path. Second, it may reduce lock contention. When we do retrying, status of slab is already changed, so we don't need a lock anymore in almost every case. "release a lock first, and re-take a lock if necessary" policy is helpful to this. Signed-off-by: NJoonsoo Kim <js1304@gmail.com> Acked-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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- 13 10月, 2012 2 次提交
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由 Jeff Layton 提交于
...and fix up the callers. For do_file_open_root, just declare a struct filename on the stack and fill out the .name field. For do_filp_open, make it also take a struct filename pointer, and fix up its callers to call it appropriately. For filp_open, add a variant that takes a struct filename pointer and turn filp_open into a wrapper around it. Signed-off-by: NJeff Layton <jlayton@redhat.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Jeff Layton 提交于
getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: NJeff Layton <jlayton@redhat.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 10 10月, 2012 2 次提交
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由 Jiri Kosina 提交于
Commit 1331e7a1 ("rcu: Remove _rcu_barrier() dependency on __stop_machine()") introduced slab_mutex -> cpu_hotplug.lock dependency through kmem_cache_destroy() -> rcu_barrier() -> _rcu_barrier() -> get_online_cpus(). Lockdep thinks that this might actually result in ABBA deadlock, and reports it as below: === [ cut here ] === ====================================================== [ INFO: possible circular locking dependency detected ] 3.6.0-rc5-00004-g0d8ee37e #143 Not tainted ------------------------------------------------------- kworker/u:2/40 is trying to acquire lock: (rcu_sched_state.barrier_mutex){+.+...}, at: [<ffffffff810f2126>] _rcu_barrier+0x26/0x1e0 but task is already holding lock: (slab_mutex){+.+.+.}, at: [<ffffffff81176e15>] kmem_cache_destroy+0x45/0xe0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (slab_mutex){+.+.+.}: [<ffffffff810ae1e2>] validate_chain+0x632/0x720 [<ffffffff810ae5d9>] __lock_acquire+0x309/0x530 [<ffffffff810ae921>] lock_acquire+0x121/0x190 [<ffffffff8155d4cc>] __mutex_lock_common+0x5c/0x450 [<ffffffff8155d9ee>] mutex_lock_nested+0x3e/0x50 [<ffffffff81558cb5>] cpuup_callback+0x2f/0xbe [<ffffffff81564b83>] notifier_call_chain+0x93/0x140 [<ffffffff81076f89>] __raw_notifier_call_chain+0x9/0x10 [<ffffffff8155719d>] _cpu_up+0xba/0x14e [<ffffffff815572ed>] cpu_up+0xbc/0x117 [<ffffffff81ae05e3>] smp_init+0x6b/0x9f [<ffffffff81ac47d6>] kernel_init+0x147/0x1dc [<ffffffff8156ab44>] kernel_thread_helper+0x4/0x10 -> #1 (cpu_hotplug.lock){+.+.+.}: [<ffffffff810ae1e2>] validate_chain+0x632/0x720 [<ffffffff810ae5d9>] __lock_acquire+0x309/0x530 [<ffffffff810ae921>] lock_acquire+0x121/0x190 [<ffffffff8155d4cc>] __mutex_lock_common+0x5c/0x450 [<ffffffff8155d9ee>] mutex_lock_nested+0x3e/0x50 [<ffffffff81049197>] get_online_cpus+0x37/0x50 [<ffffffff810f21bb>] _rcu_barrier+0xbb/0x1e0 [<ffffffff810f22f0>] rcu_barrier_sched+0x10/0x20 [<ffffffff810f2309>] rcu_barrier+0x9/0x10 [<ffffffff8118c129>] deactivate_locked_super+0x49/0x90 [<ffffffff8118cc01>] deactivate_super+0x61/0x70 [<ffffffff811aaaa7>] mntput_no_expire+0x127/0x180 [<ffffffff811ab49e>] sys_umount+0x6e/0xd0 [<ffffffff81569979>] system_call_fastpath+0x16/0x1b -> #0 (rcu_sched_state.barrier_mutex){+.+...}: [<ffffffff810adb4e>] check_prev_add+0x3de/0x440 [<ffffffff810ae1e2>] validate_chain+0x632/0x720 [<ffffffff810ae5d9>] __lock_acquire+0x309/0x530 [<ffffffff810ae921>] lock_acquire+0x121/0x190 [<ffffffff8155d4cc>] __mutex_lock_common+0x5c/0x450 [<ffffffff8155d9ee>] mutex_lock_nested+0x3e/0x50 [<ffffffff810f2126>] _rcu_barrier+0x26/0x1e0 [<ffffffff810f22f0>] rcu_barrier_sched+0x10/0x20 [<ffffffff810f2309>] rcu_barrier+0x9/0x10 [<ffffffff81176ea1>] kmem_cache_destroy+0xd1/0xe0 [<ffffffffa04c3154>] nf_conntrack_cleanup_net+0xe4/0x110 [nf_conntrack] [<ffffffffa04c31aa>] nf_conntrack_cleanup+0x2a/0x70 [nf_conntrack] [<ffffffffa04c42ce>] nf_conntrack_net_exit+0x5e/0x80 [nf_conntrack] [<ffffffff81454b79>] ops_exit_list+0x39/0x60 [<ffffffff814551ab>] cleanup_net+0xfb/0x1b0 [<ffffffff8106917b>] process_one_work+0x26b/0x4c0 [<ffffffff81069f3e>] worker_thread+0x12e/0x320 [<ffffffff8106f73e>] kthread+0x9e/0xb0 [<ffffffff8156ab44>] kernel_thread_helper+0x4/0x10 other info that might help us debug this: Chain exists of: rcu_sched_state.barrier_mutex --> cpu_hotplug.lock --> slab_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(slab_mutex); lock(cpu_hotplug.lock); lock(slab_mutex); lock(rcu_sched_state.barrier_mutex); *** DEADLOCK *** === [ cut here ] === This is actually a false positive. Lockdep has no way of knowing the fact that the ABBA can actually never happen, because of special semantics of cpu_hotplug.refcount and its handling in cpu_hotplug_begin(); the mutual exclusion there is not achieved through mutex, but through cpu_hotplug.refcount. The "neither cpu_up() nor cpu_down() will proceed past cpu_hotplug_begin() until everyone who called get_online_cpus() will call put_online_cpus()" semantics is totally invisible to lockdep. This patch therefore moves the unlock of slab_mutex so that rcu_barrier() is being called with it unlocked. It has two advantages: - it slightly reduces hold time of slab_mutex; as it's used to protect the cachep list, it's not necessary to hold it over kmem_cache_free() call any more - it silences the lockdep false positive warning, as it avoids lockdep ever learning about slab_mutex -> cpu_hotplug.lock dependency Reviewed-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Acked-by: NDavid Rientjes <rientjes@google.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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由 Hugh Dickins 提交于
Fuzzing with trinity oopsed on the 1st instruction of shmem_fh_to_dentry(), u64 inum = fid->raw[2]; which is unhelpfully reported as at the end of shmem_alloc_inode(): BUG: unable to handle kernel paging request at ffff880061cd3000 IP: [<ffffffff812190d0>] shmem_alloc_inode+0x40/0x40 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Call Trace: [<ffffffff81488649>] ? exportfs_decode_fh+0x79/0x2d0 [<ffffffff812d77c3>] do_handle_open+0x163/0x2c0 [<ffffffff812d792c>] sys_open_by_handle_at+0xc/0x10 [<ffffffff83a5f3f8>] tracesys+0xe1/0xe6 Right, tmpfs is being stupid to access fid->raw[2] before validating that fh_len includes it: the buffer kmalloc'ed by do_sys_name_to_handle() may fall at the end of a page, and the next page not be present. But some other filesystems (ceph, gfs2, isofs, reiserfs, xfs) are being careless about fh_len too, in fh_to_dentry() and/or fh_to_parent(), and could oops in the same way: add the missing fh_len checks to those. Reported-by: NSasha Levin <levinsasha928@gmail.com> Signed-off-by: NHugh Dickins <hughd@google.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Sage Weil <sage@inktank.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: stable@vger.kernel.org Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 09 10月, 2012 28 次提交
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由 David Miller 提交于
Invalidation sequences are handled in various ways on various architectures. One way, which sparc64 uses, is to let the set_*_at() functions accumulate pending flushes into a per-cpu array. Then the flush_tlb_range() et al. calls process the pending TLB flushes. In this regime, the __tlb_remove_*tlb_entry() implementations are essentially NOPs. The canonical PTE zap in mm/memory.c is: ptent = ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm); tlb_remove_tlb_entry(tlb, pte, addr); With a subsequent tlb_flush_mmu() if needed. Mirror this in the THP PMD zapping using: orig_pmd = pmdp_get_and_clear(tlb->mm, addr, pmd); page = pmd_page(orig_pmd); tlb_remove_pmd_tlb_entry(tlb, pmd, addr); And we properly accomodate TLB flush mechanims like the one described above. Signed-off-by: NDavid S. Miller <davem@davemloft.net> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 David Miller 提交于
The transparent huge page code passes a PMD pointer in as the third argument of update_mmu_cache(), which expects a PTE pointer. This never got noticed because X86 implements update_mmu_cache() as a macro and thus we don't get any type checking, and X86 is the only architecture which supports transparent huge pages currently. Before other architectures can support transparent huge pages properly we need to add a new interface which will take a PMD pointer as the third argument rather than a PTE pointer. [akpm@linux-foundation.org: implement update_mm_cache_pmd() for s390] Signed-off-by: NDavid S. Miller <davem@davemloft.net> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Yasuaki Ishimatsu 提交于
memory-hotplug: suppress "Trying to free nonexistent resource <XXXXXXXXXXXXXXXX-YYYYYYYYYYYYYYYY>" warning When our x86 box calls __remove_pages(), release_mem_region() shows many warnings. And x86 box cannot unregister iomem_resource. "Trying to free nonexistent resource <XXXXXXXXXXXXXXXX-YYYYYYYYYYYYYYYY>" release_mem_region() has been changed to be called in each PAGES_PER_SECTION by commit de7f0cba ("memory hotplug: release memory regions in PAGES_PER_SECTION chunks"). Because powerpc registers iomem_resource in each PAGES_PER_SECTION chunk. But when I hot add memory on x86 box, iomem_resource is register in each _CRS not PAGES_PER_SECTION chunk. So x86 box unregisters iomem_resource. The patch fixes the problem. Signed-off-by: NYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Len Brown <len.brown@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Christoph Lameter <cl@linux.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Nathan Fontenot <nfont@austin.ibm.com> Cc: Badari Pulavarty <pbadari@us.ibm.com> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Andrew Morton 提交于
Acked-by: NDavid Rientjes <rientjes@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Kees Cook 提交于
In the paranoid case of sysctl kernel.kptr_restrict=2, mask the kernel virtual addresses in /proc/vmallocinfo too. Signed-off-by: NKees Cook <keescook@chromium.org> Reported-by: NBrad Spengler <spender@grsecurity.net> Acked-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: NDavid Rientjes <rientjes@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 David Rientjes 提交于
NR_MLOCK is only accounted in single page units: there's no logic to handle transparent hugepages. This patch checks the appropriate number of pages to adjust the statistics by so that the correct amount of memory is reflected. Currently: $ grep Mlocked /proc/meminfo Mlocked: 19636 kB #define MAP_SIZE (4 << 30) /* 4GB */ void *ptr = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); mlock(ptr, MAP_SIZE); $ grep Mlocked /proc/meminfo Mlocked: 29844 kB munlock(ptr, MAP_SIZE); $ grep Mlocked /proc/meminfo Mlocked: 19636 kB And with this patch: $ grep Mlock /proc/meminfo Mlocked: 19636 kB mlock(ptr, MAP_SIZE); $ grep Mlock /proc/meminfo Mlocked: 4213664 kB munlock(ptr, MAP_SIZE); $ grep Mlock /proc/meminfo Mlocked: 19636 kB Signed-off-by: NDavid Rientjes <rientjes@google.com> Reported-by: NHugh Dickens <hughd@google.com> Acked-by: NHugh Dickins <hughd@google.com> Reviewed-by: NAndrea Arcangeli <aarcange@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: NMichel Lespinasse <walken@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 David Rientjes 提交于
When a transparent hugepage is mapped and it is included in an mlock() range, follow_page() incorrectly avoids setting the page's mlock bit and moving it to the unevictable lru. This is evident if you try to mlock(), munlock(), and then mlock() a range again. Currently: #define MAP_SIZE (4 << 30) /* 4GB */ void *ptr = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); mlock(ptr, MAP_SIZE); $ grep -E "Unevictable|Inactive\(anon" /proc/meminfo Inactive(anon): 6304 kB Unevictable: 4213924 kB munlock(ptr, MAP_SIZE); Inactive(anon): 4186252 kB Unevictable: 19652 kB mlock(ptr, MAP_SIZE); Inactive(anon): 4198556 kB Unevictable: 21684 kB Notice that less than 2MB was added to the unevictable list; this is because these pages in the range are not transparent hugepages since the 4GB range was allocated with mmap() and has no specific alignment. If posix_memalign() were used instead, unevictable would not have grown at all on the second mlock(). The fix is to call mlock_vma_page() so that the mlock bit is set and the page is added to the unevictable list. With this patch: mlock(ptr, MAP_SIZE); Inactive(anon): 4056 kB Unevictable: 4213940 kB munlock(ptr, MAP_SIZE); Inactive(anon): 4198268 kB Unevictable: 19636 kB mlock(ptr, MAP_SIZE); Inactive(anon): 4008 kB Unevictable: 4213940 kB Signed-off-by: NDavid Rientjes <rientjes@google.com> Acked-by: NHugh Dickins <hughd@google.com> Reviewed-by: NAndrea Arcangeli <aarcange@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michel Lespinasse <walken@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Wen Congyang 提交于
remove_memory() will be called when hot removing a memory device. But even if offlining memory, we cannot notice it. So the patch updates the memory block's state and sends notification to userspace. Additionally, the memory device may contain more than one memory block. If the memory block has been offlined, __offline_pages() will fail. So we should try to offline one memory block at a time. Thus remove_memory() also check each memory block's state. So there is no need to check the memory block's state before calling remove_memory(). Signed-off-by: NWen Congyang <wency@cn.fujitsu.com> Signed-off-by: NYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Len Brown <len.brown@intel.com> Cc: Christoph Lameter <cl@linux.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Wen Congyang 提交于
remove_memory() is called in two cases: 1. echo offline >/sys/devices/system/memory/memoryXX/state 2. hot remove a memory device In the 1st case, the memory block's state is changed and the notification that memory block's state changed is sent to userland after calling remove_memory(). So user can notice memory block is changed. But in the 2nd case, the memory block's state is not changed and the notification is not also sent to userspcae even if calling remove_memory(). So user cannot notice memory block is changed. For adding the notification at memory hot remove, the patch just prepare as follows: 1st case uses offline_pages() for offlining memory. 2nd case uses remove_memory() for offlining memory and changing memory block's state and notifing the information. The patch does not implement notification to remove_memory(). Signed-off-by: NWen Congyang <wency@cn.fujitsu.com> Signed-off-by: NYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Len Brown <len.brown@intel.com> Cc: Christoph Lameter <cl@linux.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Raghavendra D Prabhu 提交于
Following section mismatch warning is thrown during build; WARNING: vmlinux.o(.text+0x32408f): Section mismatch in reference from the function memblock_type_name() to the variable .meminit.data:memblock The function memblock_type_name() references the variable __meminitdata memblock. This is often because memblock_type_name lacks a __meminitdata annotation or the annotation of memblock is wrong. This is because memblock_type_name makes reference to memblock variable with attribute __meminitdata. Hence, the warning (even if the function is inline). [akpm@linux-foundation.org: remove inline] Signed-off-by: NRaghavendra D Prabhu <rprabhu@wnohang.net> Cc: Tejun Heo <tj@kernel.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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由 Minchan Kim 提交于
reclaim_clean_pages_from_list() reclaims clean pages before migration so cc.nr_migratepages should be updated. Currently, there is no problem but it can be wrong if we try to use the value in future. Signed-off-by: NMinchan Kim <minchan@kernel.org> Acked-by: NMel Gorman <mgorman@suse.de> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Minchan Kim 提交于
Presently CMA cannot migrate mlocked pages so it ends up failing to allocate contiguous memory space. This patch makes mlocked pages be migrated out. Of course, it can affect realtime processes but in CMA usecase, contiguous memory allocation failing is far worse than access latency to an mlocked page being variable while CMA is running. If someone wants to make the system realtime, he shouldn't enable CMA because stalls can still happen at random times. [akpm@linux-foundation.org: tweak comment text, per Mel] Signed-off-by: NMinchan Kim <minchan@kernel.org> Acked-by: NMel Gorman <mgorman@suse.de> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Robert P. J. Day 提交于
Signed-off-by: NRobert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Hugh Dickins 提交于
Simply remove UNEVICTABLE_MLOCKFREED and unevictable_pgs_mlockfreed line from /proc/vmstat: Johannes and Mel point out that it was very unlikely to have been used by any tool, and of course we can restore it easily enough if that turns out to be wrong. Signed-off-by: NHugh Dickins <hughd@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michel Lespinasse <walken@google.com> Cc: Ying Han <yinghan@google.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Minchan Kim 提交于
During memory-hotplug, I found NR_ISOLATED_[ANON|FILE] are increasing, causing the kernel to hang. When the system doesn't have enough free pages, it enters reclaim but never reclaim any pages due to too_many_isolated()==true and loops forever. The cause is that when we do memory-hotadd after memory-remove, __zone_pcp_update() clears a zone's ZONE_STAT_ITEMS in setup_pageset() although the vm_stat_diff of all CPUs still have values. In addtion, when we offline all pages of the zone, we reset them in zone_pcp_reset without draining so we loss some zone stat item. Reviewed-by: NWen Congyang <wency@cn.fujitsu.com> Signed-off-by: NMinchan Kim <minchan@kernel.org> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Minchan Kim 提交于
Revert commit 0def08e3 because check_range can't fail in migrate_to_node with considering current usecases. Quote from Johannes : I think it makes sense to revert. Not because of the semantics, but I : just don't see how check_range() could even fail for this callsite: : : 1. we pass mm->mmap->vm_start in there, so we should not fail due to : find_vma() : : 2. we pass MPOL_MF_DISCONTIG_OK, so the discontig checks do not apply : and so can not fail : : 3. we pass MPOL_MF_MOVE | MPOL_MF_MOVE_ALL, the page table loops will : continue until addr == end, so we never fail with -EIO And I added a new VM_BUG_ON for checking migrate_to_node's future usecase which might pass to MPOL_MF_STRICT. Suggested-by: NJohannes Weiner <hannes@cmpxchg.org> Signed-off-by: NMinchan Kim <minchan@kernel.org> Acked-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Vasiliy Kulikov <segooon@gmail.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Haggai Eran 提交于
In order to allow sleeping during invalidate_page mmu notifier calls, we need to avoid calling when holding the PT lock. In addition to its direct calls, invalidate_page can also be called as a substitute for a change_pte call, in case the notifier client hasn't implemented change_pte. This patch drops the invalidate_page call from change_pte, and instead wraps all calls to change_pte with invalidate_range_start and invalidate_range_end calls. Note that change_pte still cannot sleep after this patch, and that clients implementing change_pte should not take action on it in case the number of outstanding invalidate_range_start calls is larger than one, otherwise they might miss a later invalidation. Signed-off-by: NHaggai Eran <haggaie@mellanox.com> Cc: Andrea Arcangeli <andrea@qumranet.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Haggai Eran <haggaie@mellanox.com> Cc: Shachar Raindel <raindel@mellanox.com> Cc: Liran Liss <liranl@mellanox.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Avi Kivity <avi@redhat.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Sagi Grimberg 提交于
In order to allow sleeping during mmu notifier calls, we need to avoid invoking them under the page table spinlock. This patch solves the problem by calling invalidate_page notification after releasing the lock (but before freeing the page itself), or by wrapping the page invalidation with calls to invalidate_range_begin and invalidate_range_end. To prevent accidental changes to the invalidate_range_end arguments after the call to invalidate_range_begin, the patch introduces a convention of saving the arguments in consistently named locals: unsigned long mmun_start; /* For mmu_notifiers */ unsigned long mmun_end; /* For mmu_notifiers */ ... mmun_start = ... mmun_end = ... mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); ... mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); The patch changes code to use this convention for all calls to mmu_notifier_invalidate_range_start/end, except those where the calls are close enough so that anyone who glances at the code can see the values aren't changing. This patchset is a preliminary step towards on-demand paging design to be added to the RDMA stack. Why do we want on-demand paging for Infiniband? Applications register memory with an RDMA adapter using system calls, and subsequently post IO operations that refer to the corresponding virtual addresses directly to HW. Until now, this was achieved by pinning the memory during the registration calls. The goal of on demand paging is to avoid pinning the pages of registered memory regions (MRs). This will allow users the same flexibility they get when swapping any other part of their processes address spaces. Instead of requiring the entire MR to fit in physical memory, we can allow the MR to be larger, and only fit the current working set in physical memory. Why should anyone care? What problems are users currently experiencing? This can make programming with RDMA much simpler. Today, developers that are working with more data than their RAM can hold need either to deregister and reregister memory regions throughout their process's life, or keep a single memory region and copy the data to it. On demand paging will allow these developers to register a single MR at the beginning of their process's life, and let the operating system manage which pages needs to be fetched at a given time. In the future, we might be able to provide a single memory access key for each process that would provide the entire process's address as one large memory region, and the developers wouldn't need to register memory regions at all. Is there any prospect that any other subsystems will utilise these infrastructural changes? If so, which and how, etc? As for other subsystems, I understand that XPMEM wanted to sleep in MMU notifiers, as Christoph Lameter wrote at http://lkml.indiana.edu/hypermail/linux/kernel/0802.1/0460.html and perhaps Andrea knows about other use cases. Scheduling in mmu notifications is required since we need to sync the hardware with the secondary page tables change. A TLB flush of an IO device is inherently slower than a CPU TLB flush, so our design works by sending the invalidation request to the device, and waiting for an interrupt before exiting the mmu notifier handler. Avi said: kvm may be a buyer. kvm::mmu_lock, which serializes guest page faults, also protects long operations such as destroying large ranges. It would be good to convert it into a spinlock, but as it is used inside mmu notifiers, this cannot be done. (there are alternatives, such as keeping the spinlock and using a generation counter to do the teardown in O(1), which is what the "may" is doing up there). [akpm@linux-foundation.orgpossible speed tweak in hugetlb_cow(), cleanups] Signed-off-by: NAndrea Arcangeli <andrea@qumranet.com> Signed-off-by: NSagi Grimberg <sagig@mellanox.com> Signed-off-by: NHaggai Eran <haggaie@mellanox.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Haggai Eran <haggaie@mellanox.com> Cc: Shachar Raindel <raindel@mellanox.com> Cc: Liran Liss <liranl@mellanox.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Avi Kivity <avi@redhat.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Michal Hocko 提交于
Commit 0c176d52 ("mm: hugetlb: fix pgoff computation when unmapping page from vma") fixed pgoff calculation but it has replaced it by vma_hugecache_offset() which is not approapriate for offsets used for vma_prio_tree_foreach() because that one expects index in page units rather than in huge_page_shift. Johannes said: : The resulting index may not be too big, but it can be too small: assume : hpage size of 2M and the address to unmap to be 0x200000. This is regular : page index 512 and hpage index 1. If you have a VMA that maps the file : only starting at the second huge page, that VMAs vm_pgoff will be 512 but : you ask for offset 1 and miss it even though it does map the page of : interest. hugetlb_cow() will try to unmap, miss the vma, and retry the : cow until the allocation succeeds or the skipped vma(s) go away. Signed-off-by: NMichal Hocko <mhocko@suse.cz> Acked-by: NHillf Danton <dhillf@gmail.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Rientjes <rientjes@google.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Cc: <stable@vger.kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 David Rientjes 提交于
RECLAIM_DISTANCE represents the distance between nodes at which it is deemed too costly to allocate from; it's preferred to try to reclaim from a local zone before falling back to allocating on a remote node with such a distance. To do this, zone_reclaim_mode is set if the distance between any two nodes on the system is greather than this distance. This, however, ends up causing the page allocator to reclaim from every zone regardless of its affinity. What we really want is to reclaim only from zones that are closer than RECLAIM_DISTANCE. This patch adds a nodemask to each node that represents the set of nodes that are within this distance. During the zone iteration, if the bit for a zone's node is set for the local node, then reclaim is attempted; otherwise, the zone is skipped. [akpm@linux-foundation.org: fix CONFIG_NUMA=n build] Signed-off-by: NDavid Rientjes <rientjes@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Minchan Kim <minchan@kernel.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Hugh Dickins 提交于
We should not be seeing non-0 unevictable_pgs_mlockfreed any longer. So remove free_page_mlock() from the page freeing paths: __PG_MLOCKED is already in PAGE_FLAGS_CHECK_AT_FREE, so free_pages_check() will now be checking it, reporting "BUG: Bad page state" if it's ever found set. Comment UNEVICTABLE_MLOCKFREED and unevictable_pgs_mlockfreed always 0. Signed-off-by: NHugh Dickins <hughd@google.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michel Lespinasse <walken@google.com> Cc: Ying Han <yinghan@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Hugh Dickins 提交于
We had thought that pages could no longer get freed while still marked as mlocked; but Johannes Weiner posted this program to demonstrate that truncating an mlocked private file mapping containing COWed pages is still mishandled: #include <sys/types.h> #include <sys/mman.h> #include <sys/stat.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <stdio.h> int main(void) { char *map; int fd; system("grep mlockfreed /proc/vmstat"); fd = open("chigurh", O_CREAT|O_EXCL|O_RDWR); unlink("chigurh"); ftruncate(fd, 4096); map = mmap(NULL, 4096, PROT_WRITE, MAP_PRIVATE, fd, 0); map[0] = 11; mlock(map, sizeof(fd)); ftruncate(fd, 0); close(fd); munlock(map, sizeof(fd)); munmap(map, 4096); system("grep mlockfreed /proc/vmstat"); return 0; } The anon COWed pages are not caught by truncation's clear_page_mlock() of the pagecache pages; but unmap_mapping_range() unmaps them, so we ought to look out for them there in page_remove_rmap(). Indeed, why should truncation or invalidation be doing the clear_page_mlock() when removing from pagecache? mlock is a property of mapping in userspace, not a property of pagecache: an mlocked unmapped page is nonsensical. Reported-by: NJohannes Weiner <hannes@cmpxchg.org> Signed-off-by: NHugh Dickins <hughd@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Rik van Riel <riel@redhat.com> Cc: Michel Lespinasse <walken@google.com> Cc: Ying Han <yinghan@google.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Hugh Dickins 提交于
page_evictable(page, vma) is an irritant: almost all its callers pass NULL for vma. Remove the vma arg and use mlocked_vma_newpage(vma, page) explicitly in the couple of places it's needed. But in those places we don't even need page_evictable() itself! They're dealing with a freshly allocated anonymous page, which has no "mapping" and cannot be mlocked yet. Signed-off-by: NHugh Dickins <hughd@google.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Cc: Rik van Riel <riel@redhat.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Cc: Michel Lespinasse <walken@google.com> Cc: Ying Han <yinghan@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Hugh Dickins 提交于
In fuzzing with trinity, lockdep protested "possible irq lock inversion dependency detected" when isolate_lru_page() reenabled interrupts while still holding the supposedly irq-safe tree_lock: invalidate_inode_pages2 invalidate_complete_page2 spin_lock_irq(&mapping->tree_lock) clear_page_mlock isolate_lru_page spin_unlock_irq(&zone->lru_lock) isolate_lru_page() is correct to enable interrupts unconditionally: invalidate_complete_page2() is incorrect to call clear_page_mlock() while holding tree_lock, which is supposed to nest inside lru_lock. Both truncate_complete_page() and invalidate_complete_page() call clear_page_mlock() before taking tree_lock to remove page from radix_tree. I guess invalidate_complete_page2() preferred to test PageDirty (again) under tree_lock before committing to the munlock; but since the page has already been unmapped, its state is already somewhat inconsistent, and no worse if clear_page_mlock() moved up. Reported-by: NSasha Levin <levinsasha928@gmail.com> Deciphered-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NHugh Dickins <hughd@google.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michel Lespinasse <walken@google.com> Cc: Ying Han <yinghan@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Michal Hocko 提交于
kmem code uses this function and it is better to not use forward declarations for static inline functions as some (older) compilers don't like it: gcc version 4.3.4 [gcc-4_3-branch revision 152973] (SUSE Linux) mm/memcontrol.c:421: warning: `mem_cgroup_is_root' declared inline after being called mm/memcontrol.c:421: warning: previous declaration of `mem_cgroup_is_root' was here Signed-off-by: NMichal Hocko <mhocko@suse.cz> Cc: Glauber Costa <glommer@parallels.com> Cc: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Michal Hocko 提交于
TCP kmem accounting is currently guarded by CONFIG_MEMCG_KMEM ifdefs but the code is not used if !CONFIG_INET so we should rather test for both. The same applies to net/sock.h, net/ip.h and net/tcp_memcontrol.h but let's keep those outside of any ifdefs because it is considered safer wrt. future maintainability. Tested with - CONFIG_INET && CONFIG_MEMCG_KMEM - !CONFIG_INET && CONFIG_MEMCG_KMEM - CONFIG_INET && !CONFIG_MEMCG_KMEM - !CONFIG_INET && !CONFIG_MEMCG_KMEM Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org> Signed-off-by: NMichal Hocko <mhocko@suse.cz> Cc: Glauber Costa <glommer@parallels.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Jianguo Wu 提交于
I think zone->present_pages indicates pages that buddy system can management, it should be: zone->present_pages = spanned pages - absent pages - bootmem pages, but is now: zone->present_pages = spanned pages - absent pages - memmap pages. spanned pages: total size, including holes. absent pages: holes. bootmem pages: pages used in system boot, managed by bootmem allocator. memmap pages: pages used by page structs. This may cause zone->present_pages less than it should be. For example, numa node 1 has ZONE_NORMAL and ZONE_MOVABLE, it's memmap and other bootmem will be allocated from ZONE_MOVABLE, so ZONE_NORMAL's present_pages should be spanned pages - absent pages, but now it also minus memmap pages(free_area_init_core), which are actually allocated from ZONE_MOVABLE. When offlining all memory of a zone, this will cause zone->present_pages less than 0, because present_pages is unsigned long type, it is actually a very large integer, it indirectly caused zone->watermark[WMARK_MIN] becomes a large integer(setup_per_zone_wmarks()), than cause totalreserve_pages become a large integer(calculate_totalreserve_pages()), and finally cause memory allocating failure when fork process(__vm_enough_memory()). [root@localhost ~]# dmesg -bash: fork: Cannot allocate memory I think the bug described in http://marc.info/?l=linux-mm&m=134502182714186&w=2 is also caused by wrong zone present pages. This patch intends to fix-up zone->present_pages when memory are freed to buddy system on x86_64 and IA64 platforms. Signed-off-by: NJianguo Wu <wujianguo@huawei.com> Signed-off-by: NJiang Liu <jiang.liu@huawei.com> Reported-by: NPetr Tesarik <ptesarik@suse.cz> Tested-by: NPetr Tesarik <ptesarik@suse.cz> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Rik van Riel 提交于
Now that lumpy reclaim has been removed, compaction is the only way left to free up contiguous memory areas. It is time to just enable CONFIG_COMPACTION by default. Signed-off-by: NRik van Riel <riel@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Acked-by: NRafael Aquini <aquini@redhat.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Acked-by: NMinchan Kim <minchan@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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