kernel.git/include/linux/mm.h, branch linux-2.6.21.y

[PATCH] mm/{,tiny-}shmem.c cleanups

2007-03-01T22:53:35Z

shmem_{nopage,mmap} are no longer used in ipc/shm.c Signed-off-by: Adrian Bunk Cc: "Eric W. Biederman" Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Add NOPFN_REFAULT result from vm_ops->nopfn()

2007-02-12T17:48:27Z

Add a NOPFN_REFAULT return code for vm_ops->nopfn() equivalent to NOPAGE_REFAULT for vmops->nopage() indicating that the handler requests a re-execution of the faulting instruction Signed-off-by: Benjamin Herrenschmidt Cc: Arnd Bergmann Cc: Hugh Dickins Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] add vm_insert_pfn()

2007-02-12T17:48:27Z

Add a vm_insert_pfn helper, so that ->fault handlers can have nopfn functionality by installing their own pte and returning NULL. Signed-off-by: Nick Piggin Signed-off-by: Benjamin Herrenschmidt Cc: Arnd Bergmann Cc: Hugh Dickins Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] simplify shmem_aops.set_page_dirty() method

2007-02-11T18:51:19Z

shmem backed file does not have page writeback, nor it participates in backing device's dirty or writeback accounting. So using generic __set_page_dirty_nobuffers() for its .set_page_dirty aops method is a bit overkill. It unnecessarily prolongs shm unmap latency. For example, on a densely populated large shm segment (sevearl GBs), the unmapping operation becomes painfully long. Because at unmap, kernel transfers dirty bit in PTE into page struct and to the radix tree tag. The operation of tagging the radix tree is particularly expensive because it has to traverse the tree from the root to the leaf node on every dirty page. What's bothering is that radix tree tag is used for page write back. However, shmem is memory backed and there is no page write back for such file system. And in the end, we spend all that time tagging radix tree and none of that fancy tagging will be used. So let's simplify it by introduce a new aops __set_page_dirty_no_writeback and this will speed up shm unmap. Signed-off-by: Ken Chen Cc: Peter Zijlstra Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] zoneid: fix up calculations for ZONEID_PGSHIFT

2007-02-11T18:51:19Z

Currently if we have a non-zero ZONES_SHIFT we assume we are able to rely on that as the bottom edge of the ZONEID, if not then we use the NODES_PGOFF as the right end of either NODES _or_ SECTION. This latter is more luck than judgement and would be incorrect if we reordered the SECTION,NODE,ZONE options in the fields space. Really what we want is the lower of the right hand end of the two fields we are using (either NODE,ZONE or SECTION,ZONE). Codify that explicitly. As always allow for there being no bits in either of the fields, such as might be valid in a non-numa machine with only a zone NORMAL. I have checked that the compiler is still able to constant fold all of this away correctly. Signed-off-by: Andy Whitcroft Acked-by: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Add install_special_mapping

2007-02-09T17:25:47Z

This patch adds a utility function install_special_mapping, for creating a special vma using a fixed set of preallocated pages as backing, such as for a vDSO. This consolidates some nearly identical code used for vDSO mapping reimplemented for different architectures. Signed-off-by: Roland McGrath Cc: Ingo Molnar Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Add VM_ALWAYSDUMP

2007-01-26T21:50:58Z

This patch adds the VM_ALWAYSDUMP flag for vm_flags in vm_area_struct. This provides a clean explicit way to have a vma always included in core dumps, as is needed for vDSO's. Signed-off-by: Roland McGrath Cc: Ingo Molnar Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Fix sparsemem on Cell

2007-01-12T02:18:20Z

Fix an oops experienced on the Cell architecture when init-time functions, early_*(), are called at runtime. It alters the call paths to make sure that the callers explicitly say whether the call is being made on behalf of a hotplug even, or happening at boot-time. It has been compile tested on ppc64, ia64, s390, i386 and x86_64. Acked-by: Arnd Bergmann Signed-off-by: Dave Hansen Cc: Yasunori Goto Acked-by: Andy Whitcroft Cc: Christoph Lameter Cc: Martin Schwidefsky Acked-by: Heiko Carstens Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] mm: make compound page destructor handling explicit

2006-12-07T16:39:25Z

Currently we we use the lru head link of the second page of a compound page to hold its destructor. This was ok when it was purely an internal implmentation detail. However, hugetlbfs overrides this destructor violating the layering. Abstract this out as explicit calls, also introduce a type for the callback function allowing them to be type checked. For each callback we pre-declare the function, causing a type error on definition rather than on use elsewhere. [akpm@osdl.org: cleanups] Signed-off-by: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] numa node ids are int, page_to_nid and zone_to_nid should return int

2006-12-07T16:39:23Z

NUMA node ids are passed as either int or unsigned int almost exclusivly page_to_nid and zone_to_nid both return unsigned long. This is a throw back to when page_to_nid was a #define and was thus exposing the real type of the page flags field. In addition to fixing up the definitions of page_to_nid and zone_to_nid I audited the users of these functions identifying the following incorrect uses: 1) mm/page_alloc.c show_node() -- printk dumping the node id, 2) include/asm-ia64/pgalloc.h pgtable_quicklist_free() -- comparison against numa_node_id() which returns an int from cpu_to_node(), and 3) mm/mpolicy.c check_pte_range -- used as an index in node_isset which uses bit_set which in generic code takes an int. Signed-off-by: Andy Whitcroft Cc: Christoph Lameter Cc: "Luck, Tony" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds