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| | * HWPOISON, hugetlb: soft offlining for hugepageNaoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch extends soft offlining framework to support hugepage. When memory corrected errors occur repeatedly on a hugepage, we can choose to stop using it by migrating data onto another hugepage and disabling the original (maybe half-broken) one. ChangeLog since v4: - branch soft_offline_page() for hugepage ChangeLog since v3: - remove comment about "ToDo: hugepage soft-offline" ChangeLog since v2: - move refcount handling into isolate_lru_page() ChangeLog since v1: - add double check in isolating hwpoisoned hugepage - define free/non-free checker for hugepage - postpone calling put_page() for hugepage in soft_offline_page() Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * HWPOSION, hugetlb: recover from free hugepage error when !MF_COUNT_INCREASEDNaoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently error recovery for free hugepage works only for MF_COUNT_INCREASED. This patch enables !MF_COUNT_INCREASED case. Free hugepages can be handled directly by alloc_huge_page() and dequeue_hwpoisoned_huge_page(), and both of them are protected by hugetlb_lock, so there is no race between them. Note that this patch defines the refcount of HWPoisoned hugepage dequeued from freelist is 1, deviated from present 0, thereby we can avoid race between unpoison and memory failure on free hugepage. This is reasonable because unlikely to free buddy pages, free hugepage is governed by hugetlbfs even after error handling finishes. And it also makes unpoison code added in the later patch cleaner. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * hugetlb: move refcounting in hugepage allocation inside hugetlb_lockNaoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently alloc_huge_page() raises page refcount outside hugetlb_lock. but it causes race when dequeue_hwpoison_huge_page() runs concurrently with alloc_huge_page(). To avoid it, this patch moves set_page_refcounted() in hugetlb_lock. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * HWPOISON, hugetlb: add free check to dequeue_hwpoison_huge_page()Naoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This check is necessary to avoid race between dequeue and allocation, which can cause a free hugepage to be dequeued twice and get kernel unstable. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * hugetlb: hugepage migration coreNaoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch extends page migration code to support hugepage migration. One of the potential users of this feature is soft offlining which is triggered by memory corrected errors (added by the next patch.) Todo: - there are other users of page migration such as memory policy, memory hotplug and memocy compaction. They are not ready for hugepage support for now. ChangeLog since v4: - define migrate_huge_pages() - remove changes on isolation/putback_lru_page() ChangeLog since v2: - refactor isolate/putback_lru_page() to handle hugepage - add comment about race on unmap_and_move_huge_page() ChangeLog since v1: - divide migration code path for hugepage - define routine checking migration swap entry for hugetlb - replace "goto" with "if/else" in remove_migration_pte() Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * hugetlb: redefine hugepage copy functionsNaoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch modifies hugepage copy functions to have only destination and source hugepages as arguments for later use. The old ones are renamed from copy_{gigantic,huge}_page() to copy_user_{gigantic,huge}_page(). This naming convention is consistent with that between copy_highpage() and copy_user_highpage(). ChangeLog since v4: - add blank line between local declaration and code - remove unnecessary might_sleep() ChangeLog since v2: - change copy_huge_page() from macro to inline dummy function to avoid compile warning when !CONFIG_HUGETLB_PAGE. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * hugetlb: add allocate function for hugepage migrationNaoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We can't use existing hugepage allocation functions to allocate hugepage for page migration, because page migration can happen asynchronously with the running processes and page migration users should call the allocation function with physical addresses (not virtual addresses) as arguments. ChangeLog since v3: - unify alloc_buddy_huge_page() and alloc_buddy_huge_page_node() ChangeLog since v2: - remove unnecessary get/put_mems_allowed() (thanks to David Rientjes) ChangeLog since v1: - add comment on top of alloc_huge_page_no_vma() Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Reviewed-by: Christoph Lameter <cl@linux.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * hugetlb: fix metadata corruption in hugetlb_fault()Naoya Horiguchi2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since the PageHWPoison() check is for avoiding hwpoisoned page remained in pagecache mapping to the process, it should be done in "found in pagecache" branch, not in the common path. Otherwise, metadata corruption occurs if memory failure happens between alloc_huge_page() and lock_page() because page fault fails with metadata changes remained (such as refcount, mapcount, etc.) This patch moves the check to "found in pagecache" branch and fix the problem. ChangeLog since v2: - remove retry check in "new allocation" path. - make description more detailed - change patch name from "HWPOISON, hugetlb: move PG_HWPoison bit check" Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Wu Fengguang <fengguang.wu@intel.com> Reviewed-by: Christoph Lameter <cl@linux.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| * | Merge branch 'hwpoison-cleanups' into hwpoisonAndi Kleen2010-10-22
| |\ \
| | * | HWPOISON: Remove retry loop for try_to_unmapAndi Kleen2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't reply in other temporary failure cases and there were no reports of replies happening. I think the original reason it was added was also just an early bug, not an observation of the race. So remove the loop for now, but keep a warning message. Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * | HWPOISON: Turn addr_valid from bitfield into charAndi Kleen2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The addr_valid flag is the only flag in "to_kill" and it's slightly more efficient to have it as char instead of a bitfield. Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * | HWPOISON: Disable DEBUG by defaultAndi Kleen2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that only a few obscure messages are left as pr_debug disable outputting of pr_debug in memory-failure.c by default. Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * | HWPOISON: Convert pr_debugs to pr_infoAndi Kleen2010-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Convert a lot of pr_debugs in memory-failure.c that are generally useful to pr_info. It's reasonable to print at least one message why offlining succeeded or failed by default. Signed-off-by: Andi Kleen <ak@linux.intel.com>
| | * | HWPOISON: Improve comments in memory-failure.cAndi Kleen2010-10-08
| | |/ | | | | | | | | | | | | | | | | | | | | | Clean up and improve the overview comment in memory-failure.c Tidy some grammar issues in other comments. Signed-off-by: Andi Kleen <ak@linux.intel.com>
* | | [S390] add support for nonquiescing sskeMartin Schwidefsky2010-10-25
| | | | | | | | | | | | | | | | | | | | | | | | Improve performance of the sske operation by using the nonquiescing variant if the affected page has no mappings established. On machines with no support for the new sske variant the mask bit will be ignored. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | Merge branch 'for-next' of ↵Linus Torvalds2010-10-24
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits) Update broken web addresses in arch directory. Update broken web addresses in the kernel. Revert "drivers/usb: Remove unnecessary return's from void functions" for musb gadget Revert "Fix typo: configuation => configuration" partially ida: document IDA_BITMAP_LONGS calculation ext2: fix a typo on comment in ext2/inode.c drivers/scsi: Remove unnecessary casts of private_data drivers/s390: Remove unnecessary casts of private_data net/sunrpc/rpc_pipe.c: Remove unnecessary casts of private_data drivers/infiniband: Remove unnecessary casts of private_data drivers/gpu/drm: Remove unnecessary casts of private_data kernel/pm_qos_params.c: Remove unnecessary casts of private_data fs/ecryptfs: Remove unnecessary casts of private_data fs/seq_file.c: Remove unnecessary casts of private_data arm: uengine.c: remove C99 comments arm: scoop.c: remove C99 comments Fix typo configue => configure in comments Fix typo: configuation => configuration Fix typo interrest[ing|ed] => interest[ing|ed] Fix various typos of valid in comments ... Fix up trivial conflicts in: drivers/char/ipmi/ipmi_si_intf.c drivers/usb/gadget/rndis.c net/irda/irnet/irnet_ppp.c
| * | | Fix typo s/contenious/continuous in commentNikanth Karthikesan2010-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix typo s/contenious/continuous in comment. Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | | Merge branch 'master' into for-nextJiri Kosina2010-08-11
| |\ \ \ | | | | | | | | | | | | | | | | | | | | Conflicts: fs/exofs/inode.c
| * | | | fix a typo on comments in mm/percpu.cNamhyung Kim2010-08-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'eqaul' should be 'equal'. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | | | Merge branch 'for-linus' of ↵Linus Torvalds2010-10-24
|\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: (27 commits) SLUB: Fix memory hotplug with !NUMA slub: Move functions to reduce #ifdefs slub: Enable sysfs support for !CONFIG_SLUB_DEBUG SLUB: Optimize slab_free() debug check slub: Move NUMA-related functions under CONFIG_NUMA slub: Add lock release annotation slub: Fix signedness warnings slub: extract common code to remove objects from partial list without locking SLUB: Pass active and inactive redzone flags instead of boolean to debug functions slub: reduce differences between SMP and NUMA Revert "Slub: UP bandaid" percpu: clear memory allocated with the km allocator percpu: use percpu allocator on UP too percpu: reduce PCPU_MIN_UNIT_SIZE to 32k vmalloc: pcpu_get/free_vm_areas() aren't needed on UP SLUB: Fix merged slab cache names Slub: UP bandaid slub: fix SLUB_RESILIENCY_TEST for dynamic kmalloc caches slub: Fix up missing kmalloc_cache -> kmem_cache_node case for memoryhotplug slub: Add dummy functions for the !SLUB_DEBUG case ...
| * \ \ \ \ Merge branch 'master' into for-linusPekka Enberg2010-10-24
| |\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: include/linux/percpu.h mm/percpu.c
| * | | | | | SLUB: Fix memory hotplug with !NUMAPekka Enberg2010-10-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes the following build breakage when memory hotplug is enabled on UMA configurations: /home/test/linux-2.6/mm/slub.c: In function 'kmem_cache_init': /home/test/linux-2.6/mm/slub.c:3031:2: error: 'slab_memory_callback' undeclared (first use in this function) /home/test/linux-2.6/mm/slub.c:3031:2: note: each undeclared identifier is reported only once for each function it appears in make[2]: *** [mm/slub.o] Error 1 make[1]: *** [mm] Error 2 make: *** [sub-make] Error 2 Reported-by: Zimny Lech <napohybelskurwysynom2010@gmail.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Move functions to reduce #ifdefsChristoph Lameter2010-10-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a lot of #ifdef/#endifs that can be avoided if functions would be in different places. Move them around and reduce #ifdef. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Enable sysfs support for !CONFIG_SLUB_DEBUGChristoph Lameter2010-10-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently disabling CONFIG_SLUB_DEBUG also disabled SYSFS support meaning that the slabs cannot be tuned without DEBUG. Make SYSFS support independent of CONFIG_SLUB_DEBUG Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | SLUB: Optimize slab_free() debug checkPekka Enberg2010-10-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch optimizes slab_free() debug check to use "c->node != NUMA_NO_NODE" instead of "c->node >= 0" because the former generates smaller code on x86-64: Before: 4736: 48 39 70 08 cmp %rsi,0x8(%rax) 473a: 75 26 jne 4762 <kfree+0xa2> 473c: 44 8b 48 10 mov 0x10(%rax),%r9d 4740: 45 85 c9 test %r9d,%r9d 4743: 78 1d js 4762 <kfree+0xa2> After: 4736: 48 39 70 08 cmp %rsi,0x8(%rax) 473a: 75 23 jne 475f <kfree+0x9f> 473c: 83 78 10 ff cmpl $0xffffffffffffffff,0x10(%rax) 4740: 74 1d je 475f <kfree+0x9f> This patch also cleans up __slab_alloc() to use NUMA_NO_NODE instead of "-1" for enabling debugging for a per-CPU cache. Acked-by: Christoph Lameter <cl@linux.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Move NUMA-related functions under CONFIG_NUMANamhyung Kim2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make kmalloc_cache_alloc_node_notrace(), kmalloc_large_node() and __kmalloc_node_track_caller() to be compiled only when CONFIG_NUMA is selected. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Add lock release annotationNamhyung Kim2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The unfreeze_slab() releases page's PG_locked bit but was missing proper annotation. The deactivate_slab() needs to be marked also since it calls unfreeze_slab() without grabbing the lock. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Fix signedness warningsNamhyung Kim2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The bit-ops routines require its arg to be a pointer to unsigned long. This leads sparse to complain about different signedness as follows: mm/slub.c:2425:49: warning: incorrect type in argument 2 (different signedness) mm/slub.c:2425:49: expected unsigned long volatile *addr mm/slub.c:2425:49: got long *map Acked-by: Christoph Lameter <cl@linux.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: extract common code to remove objects from partial list without lockingChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are a couple of places where repeat the same statements when removing a page from the partial list. Consolidate that into __remove_partial(). Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | SLUB: Pass active and inactive redzone flags instead of boolean to debug ↵Christoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | functions Pass the actual values used for inactive and active redzoning to the functions that check the objects. Avoids a lot of the ? : things to lookup the values in the functions. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: reduce differences between SMP and NUMAChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Reduce the #ifdefs and simplify bootstrap by making SMP and NUMA as much alike as possible. This means that there will be an additional indirection to get to the kmem_cache_node field under SMP. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | Revert "Slub: UP bandaid"Pekka Enberg2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit 5249d039500f05a5ab379286b1d23ab9b04d3f2c. It's not needed after commit bbddff0545878a8649c091a9dd7c43ce91516734 ("percpu: use percpu allocator on UP too").
| * | | | | | percpu: clear memory allocated with the km allocatorTejun Heo2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Percpu allocator should clear memory before returning it but the km allocator forgot to do it. Fix it. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Peter Zijlstra <peterz@infradead.org>
| * | | | | | percpu: use percpu allocator on UP tooTejun Heo2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On UP, percpu allocations were redirected to kmalloc. This has the following problems. * For certain amount of allocations (determined by PERCPU_DYNAMIC_EARLY_SLOTS and PERCPU_DYNAMIC_EARLY_SIZE), percpu allocator can be used before the usual kernel memory allocator is brought online. On SMP, this is used to initialize the kernel memory allocator. * percpu allocator honors alignment upto PAGE_SIZE but kmalloc() doesn't. For example, workqueue makes use of larger alignments for cpu_workqueues. Currently, users of percpu allocators need to handle UP differently, which is somewhat fragile and ugly. Other than small amount of memory, there isn't much to lose by enabling percpu allocator on UP. It can simply use kernel memory based chunk allocation which was added for SMP archs w/o MMUs. This patch removes mm/percpu_up.c, builds mm/percpu.c on UP too and makes UP build use percpu-km. As percpu addresses and kernel addresses are always identity mapped and static percpu variables don't need any special treatment, nothing is arch dependent and mm/percpu.c implements generic setup_per_cpu_areas() for UP. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Pekka Enberg <penberg@cs.helsinki.fi>
| * | | | | | vmalloc: pcpu_get/free_vm_areas() aren't needed on UPTejun Heo2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These functions are used only by percpu memory allocator on SMP. Don't build them on UP. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Nick Piggin <npiggin@kernel.dk>
| * | | | | | SLUB: Fix merged slab cache namesPekka Enberg2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As explained by Linus "I'm Proud to be an American" Torvalds: Looking at the merging code, I actually think it's totally buggy. If you have something like this: - load module A: create slab cache A - load module B: create slab cache B that can merge with A - unload module A - "cat /proc/slabinfo": BOOM. Oops. exactly because the name is not handled correctly, and you'll have module B holding open a slab cache that has a name pointer that points to module A that no longer exists. This patch fixes the problem by using kstrdup() to allocate dynamic memory for ->name of "struct kmem_cache" as suggested by Christoph Lameter. Acked-by: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org> Conflicts: mm/slub.c
| * | | | | | Slub: UP bandaidChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since the percpu allocator does not provide early allocation in UP mode (only in SMP configurations) use __get_free_page() to improvise a compound page allocation that can be later freed via kfree(). Compound pages will be released when the cpu caches are resized. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: fix SLUB_RESILIENCY_TEST for dynamic kmalloc cachesDavid Rientjes2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that the kmalloc_caches array is dynamically allocated at boot, SLUB_RESILIENCY_TEST needs to be fixed to pass the correct type. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Fix up missing kmalloc_cache -> kmem_cache_node case for memoryhotplugChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Memory hotplug allocates and frees per node structures. Use the correct name. Acked-by: David Rientjes <rientjes@google.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Add dummy functions for the !SLUB_DEBUG caseChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Wed, 25 Aug 2010, Randy Dunlap wrote: > mm/slub.c:1732: error: implicit declaration of function 'slab_pre_alloc_hook' > mm/slub.c:1751: error: implicit declaration of function 'slab_post_alloc_hook' > mm/slub.c:1881: error: implicit declaration of function 'slab_free_hook' > mm/slub.c:1886: error: implicit declaration of function 'slab_free_hook_irq' Empty functions are missing if the runtime debuggability option is compiled out. Provide the fall back functions to empty hooks if SLUB_DEBUG is not set. Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slob: fix gfp flags for order-0 page allocationsDavid Rientjes2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kmalloc_node() may allocate higher order slob pages, but the __GFP_COMP bit is only passed to the page allocator and not represented in the tracepoint event. The bit should be passed to trace_kmalloc_node() as well. Acked-by: Matt Mackall <mpm@selenic.com> Reviewed-by: Christoph Lameter <cl@linux.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Move gfpflag masking out of the hotpathChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move the gfpflags masking into the hooks for checkers and into the slowpaths. gfpflag masking requires access to a global variable and thus adds an additional cacheline reference to the hotpaths. If no hooks are active then the gfpflag masking will result in code that the compiler can toss out. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Extract hooks for memory checkers from hotpathsChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extract the code that memory checkers and other verification tools use from the hotpaths. Makes it easier to add new ones and reduces the disturbances of the hotpaths. Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Dynamically size kmalloc cache allocationsChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kmalloc caches are statically defined and may take up a lot of space just because the sizes of the node array has to be dimensioned for the largest node count supported. This patch makes the size of the kmem_cache structure dynamic throughout by creating a kmem_cache slab cache for the kmem_cache objects. The bootstrap occurs by allocating the initial one or two kmem_cache objects from the page allocator. C2->C3 - Fix various issues indicated by David - Make create kmalloc_cache return a kmem_cache * pointer. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Remove static kmem_cache_cpu array for bootChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The percpu allocator can now handle allocations during early boot. So drop the static kmem_cache_cpu array. Cc: Tejun Heo <tj@kernel.org> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Remove dynamic dma slab allocationChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove the dynamic dma slab allocation since this causes too many issues with nested locks etc etc. The change avoids passing gfpflags into many functions. V3->V4: - Create dma caches in kmem_cache_init() instead of kmem_cache_init_late(). Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
| * | | | | | slub: Force no inlining of debug functionsChristoph Lameter2010-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Compiler folds the debgging functions into the critical paths. Avoid that by adding noinline to the functions that check for problems. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
* | | | | | | Merge branch 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2010-10-24
|\ \ \ \ \ \ \ | |_|/ / / / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (321 commits) KVM: Drop CONFIG_DMAR dependency around kvm_iommu_map_pages KVM: Fix signature of kvm_iommu_map_pages stub KVM: MCE: Send SRAR SIGBUS directly KVM: MCE: Add MCG_SER_P into KVM_MCE_CAP_SUPPORTED KVM: fix typo in copyright notice KVM: Disable interrupts around get_kernel_ns() KVM: MMU: Avoid sign extension in mmu_alloc_direct_roots() pae root address KVM: MMU: move access code parsing to FNAME(walk_addr) function KVM: MMU: audit: check whether have unsync sps after root sync KVM: MMU: audit: introduce audit_printk to cleanup audit code KVM: MMU: audit: unregister audit tracepoints before module unloaded KVM: MMU: audit: fix vcpu's spte walking KVM: MMU: set access bit for direct mapping KVM: MMU: cleanup for error mask set while walk guest page table KVM: MMU: update 'root_hpa' out of loop in PAE shadow path KVM: x86 emulator: Eliminate compilation warning in x86_decode_insn() KVM: x86: Fix constant type in kvm_get_time_scale KVM: VMX: Add AX to list of registers clobbered by guest switch KVM guest: Move a printk that's using the clock before it's ready KVM: x86: TSC catchup mode ...
| * | | | | | export __get_user_pages_fast() functionXiao Guangrong2010-10-24
| | |_|_|_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This function is used by KVM to pin process's page in the atomic context. Define the 'weak' function to avoid other architecture not support it Acked-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
* | | | | | Merge branch 'for-linus' of ↵Linus Torvalds2010-10-22
|\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu: update comments to reflect that percpu allocations are always zero-filled percpu: Optimize __get_cpu_var() x86, percpu: Optimize this_cpu_ptr percpu: clear memory allocated with the km allocator percpu: fix build breakage on s390 and cleanup build configuration tests percpu: use percpu allocator on UP too percpu: reduce PCPU_MIN_UNIT_SIZE to 32k vmalloc: pcpu_get/free_vm_areas() aren't needed on UP Fixed up trivial conflicts in include/linux/percpu.h
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-06 13:35:29 -0500