- 09 Jan, 2006 18 commits
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Christoph Lameter authored
This adds the basic page migration function with a minimal implementation that only allows the eviction of pages to swap space. Page eviction and migration may be useful to migrate pages, to suspend programs or for remapping single pages (useful for faulty pages or pages with soft ECC failures) The process is as follows: The function wanting to migrate pages must first build a list of pages to be migrated or evicted and take them off the lru lists via isolate_lru_page(). isolate_lru_page determines that a page is freeable based on the LRU bit set. Then the actual migration or swapout can happen by calling migrate_pages(). migrate_pages does its best to migrate or swapout the pages and does multiple passes over the list. Some pages may only be swappable if they are not dirty. migrate_pages may start writing out dirty pages in the initial passes over the pages. However, migrate_pages may not be able to migrate or evict all pages for a variety of reasons. The remaining pages may be returned to the LRU lists using putback_lru_pages(). Changelog V4->V5: - Use the lru caches to return pages to the LRU Changelog V3->V4: - Restructure code so that applying patches to support full migration does require minimal changes. Rename swapout_pages() to migrate_pages(). Changelog V2->V3: - Extract common code from shrink_list() and swapout_pages() Signed-off-by:
Mike Kravetz <kravetz@us.ibm.com> Signed-off-by:
Christoph Lameter <clameter@sgi.com> Cc: "Michael Kerrisk" <mtk-manpages@gmx.net> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Christoph Lameter authored
Add PF_SWAPWRITE to control a processes permission to write to swap. - Use PF_SWAPWRITE in may_write_to_queue() instead of checking for kswapd and pdflush - Set PF_SWAPWRITE flag for kswapd and pdflush Signed-off-by:
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Christoph Lameter authored
This is the start of the `swap migration' patch series. Swap migration allows the moving of the physical location of pages between nodes in a numa system while the process is running. This means that the virtual addresses that the process sees do not change. However, the system rearranges the physical location of those pages. The main intent of page migration patches here is to reduce the latency of memory access by moving pages near to the processor where the process accessing that memory is running. The patchset allows a process to manually relocate the node on which its pages are located through the MF_MOVE and MF_MOVE_ALL options while setting a new memory policy. The pages of process can also be relocated from another process using the sys_migrate_pages() function call. Requires CAP_SYS_ADMIN. The migrate_pages function call takes two sets of nodes and moves pages of a process that are located on the from nodes to the destination nodes. Manual migration is very useful if for example the scheduler has relocated a process to a processor on a distant node. A batch scheduler or an administrator can detect the situation and move the pages of the process nearer to the new processor. sys_migrate_pages() could be used on non-numa machines as well, to force all of a particualr process's pages out to swap, if someone thinks that's useful. Larger installations usually partition the system using cpusets into sections of nodes. Paul has equipped cpusets with the ability to move pages when a task is moved to another cpuset. This allows automatic control over locality of a process. If a task is moved to a new cpuset then also all its pages are moved with it so that the performance of the process does not sink dramatically (as is the case today). Swap migration works by simply evicting the page. The pages must be faulted back in. The pages are then typically reallocated by the system near the node where the process is executing. For swap migration the destination of the move is controlled by the allocation policy. Cpusets set the allocation policy before calling sys_migrate_pages() in order to move the pages as intended. No allocation policy changes are performed for sys_migrate_pages(). This means that the pages may not faulted in to the specified nodes if no allocation policy was set by other means. The pages will just end up near the node where the fault occurred. There's another patch series in the pipeline which implements "direct migration". The direct migration patchset extends the migration functionality to avoid going through swap. The destination node of the relation is controllable during the actual moving of pages. The crutch of using the allocation policy to relocate is not necessary and the pages are moved directly to the target. Its also faster since swap is not used. And sys_migrate_pages() can then move pages directly to the specified node. Implement functions to isolate pages from the LRU and put them back later. This patch: An earlier implementation was provided by Hirokazu Takahashi <taka@valinux.co.jp> and IWAMOTO Toshihiro <iwamoto@valinux.co.jp> for the memory hotplug project. From: Magnus This breaks out isolate_lru_page() and putpack_lru_page(). Needed for swap migration. Signed-off-by:
Magnus Damm <magnus.damm@gmail.com> Signed-off-by:
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Christoph Lameter authored
swap migration's isolate_lru_page() currently uses an IPI to notify other processors that the lru caches need to be drained if the page cannot be found on the LRU. The IPI interrupt may interrupt a processor that is just processing lru requests and cause a race condition. This patch introduces a new function run_on_each_cpu() that uses the keventd() to run the LRU draining on each processor. Processors disable preemption when dealing the LRU caches (these are per processor) and thus executing LRU draining from another process is safe. Thanks to Lee Schermerhorn <lee.schermerhorn@hp.com> for finding this race condition. Signed-off-by:
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Nick Piggin authored
Try to streamline free_pages_bulk by ensuring callers don't pass in a 'count' that exceeds the list size. Some cleanups: Rename __free_pages_bulk to __free_one_page. Put the page list manipulation from __free_pages_ok into free_one_page. Make __free_pages_ok static. Signed-off-by:
Nick Piggin <npiggin@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Nick Piggin authored
Use zone_pcp everywhere even though NUMA code "knows" the internal details of the zone. Stop other people trying to copy, and it looks nicer. Also, only print the pagesets of online cpus in zoneinfo. Signed-off-by:
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Rohit Seth authored
As recently there has been lot of traffic on the right values for batch and high water marks for per_cpu_pagelists. This patch makes these two variables configurable through /proc interface. A new tunable /proc/sys/vm/percpu_pagelist_fraction is added. This entry controls the fraction of pages at most in each zone that are allocated for each per cpu page list. The min value for this is 8. It means that we don't allow more than 1/8th of pages in each zone to be allocated in any single per_cpu_pagelist. The batch value of each per cpu pagelist is also updated as a result. It is set to pcp->high/4. The upper limit of batch is (PAGE_SHIFT * 8) Signed-off-by:
Rohit Seth <rohit.seth@intel.com> Signed-off-by:
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Andrew Morton authored
Add /proc/sys/vm/drop_caches. When written to, this will cause the kernel to discard as much pagecache and/or reclaimable slab objects as it can. THis operation requires root permissions. It won't drop dirty data, so the user should run `sync' first. Caveats: a) Holds inode_lock for exorbitant amounts of time. b) Needs to be taught about NUMA nodes: propagate these all the way through so the discarding can be controlled on a per-node basis. This is a debugging feature: useful for getting consistent results between filesystem benchmarks. We could possibly put it under a config option, but it's less than 300 bytes. Signed-off-by:
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Christoph Lameter authored
For some reason there is an #ifdef CONFIG_NUMA within another #ifdef CONFIG_NUMA in the page allocator. Remove innermost #ifdef CONFIG_NUMA Signed-off-by:
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Pekka Enberg authored
The slab allocator code is inconsistent in coding style and messy. For this patch, I ran Lindent for mm/slab.c and fixed up goofs by hand. Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by:
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Pekka Enberg authored
This patch moves the ugly loop that determines the 'optimal' size (page order) of cache slabs from kmem_cache_create() to a separate function and cleans it up a bit. Thanks to Matthew Wilcox for the help with this patch. Signed-off-by:
Matthew Dobson <colpatch@us.ibm.com> Signed-off-by:
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Pekka Enberg authored
This patch extracts slabinfo header printing to a separate function print_slabinfo_header() to make s_start() more readable. Signed-off-by:
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Pekka Enberg authored
__alloc_percpu and alloc_percpu both take an 'align' argument which is completely ignored. snmp6_mib_init() in net/ipv6/af_inet6.c attempts to use it, but it will be ignored. Therefore, remove the 'align' argument and fixup the lone caller. Signed-off-by:
Manfred Spraul <manfred@colorfullife.com> Signed-off-by:
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Olaf Hering authored
Fix compilation with CONFIG_MEMORY_HOTPLUG=y and gcc41. Also remove unneeded declations, add a public function. drivers/base/memory.c:53: error: static declaration of 'register_memory_notifier' follows non-static declaration include/linux/memory.h:85: error: previous declaration of 'register_memory_notifier' was here drivers/base/memory.c:58: error: static declaration of 'unregister_memory_notifier' follows non-static declaration include/linux/memory.h:86: error: previous declaration of 'unregister_memory_notifier' was here drivers/base/memory.c:68: error: static declaration of 'register_memory' follows non-static declaration include/linux/memory.h:73: error: previous declaration of 'register_memory' was here Signed-off-by:
Olaf Hering <olh@suse.de> Signed-off-by:
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Woody Suwalski authored
Cleanup for the ARM-only watchdog driver wdt977. This is probably the last update, since we want to merge with w83977f_wdt. Jose Goncalves has ported this driver to i386, so probably we can iron out configuration differences. Signed-off-by:
Woody Suwalski <woodys@xandros.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Marcelo Tosatti authored
Use no_llseek function. Signed-off-by:
Marcelo Tosatti <marcelo.tosatti@cyclades.com> Cc: "Brian S. Julin" <bri@calyx.com> Acked-by:
Vojtech Pavlik <vojtech@suse.cz> Cc: Dmitry Torokhov <dtor_core@ameritech.net> Signed-off-by:
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Andrew Morton authored
For BITS_PER_LONG Signed-off-by:
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Andrew Morton authored
Hugh says: page_alloc_cpu_notify() specifically contains code to /* Add dead cpu's page_states to our own. */ which handles this more efficiently. Cc: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by:
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- 07 Jan, 2006 22 commits
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Adrian Bunk authored
This patch contains the following cleanups: - addrconf.c: make addrconf_dad_stop() static - inet6_connection_sock.c should #include <net/inet6_connection_sock.h> for getting the prototypes of it's global functions Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Adrian Bunk authored
Since there's no longer any external user of ip_fragment() we can make it static. Signed-off-by:
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David S. Miller authored
Signed-off-by: -
Joe Kappus authored
Signed-off-by:
Joe Kappus <joecool1029@gmail.com> Signed-off-by:
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Francois Romieu authored
The unlocking disappeared during commit 5793f4be. Signed-off-by:
Francois Romieu <romieu@fr.zoreil.com> Signed-off-by:
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Patrick McHardy authored
Signed-off-by:
Patrick McHardy <kaber@trash.net> Signed-off-by:
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Patrick McHardy authored
Handle NAT of decapsulated IPsec packets by reconstructing the struct flowi of the original packet from the conntrack information for IPsec policy checks. Signed-off-by:
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Patrick McHardy authored
Keep the conntrack reference until policy checks have been performed for IPsec NAT support. The reference needs to be dropped before a packet is queued to avoid having the conntrack module unloadable. Signed-off-by:
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Patrick McHardy authored
When NAT changes the key used for the xfrm lookup it needs to be done again. If a new policy is returned in POST_ROUTING the packet needs to be passed to xfrm4_output_one manually after all hooks were called because POST_ROUTING is called with fixed okfn (ip_finish_output). Signed-off-by:
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Patrick McHardy authored
Preparation for IPsec support for NAT: Use conntrack information instead of saving the saving and comparing the addresses to determine if a packet was NATed and needs to be rerouted to make it easier to extend the key. Signed-off-by:
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Patrick McHardy authored
ip_route_me_harder doesn't use the port numbers of the xfrm lookup and uses ip_route_input for non-local addresses which doesn't do a xfrm lookup, ip6_route_me_harder doesn't do a xfrm lookup at all. Use xfrm_decode_session and do the lookup manually, make sure both only do the lookup if the packet hasn't been transformed already. Makeing sure the lookup only happens once needs a new field in the IP6CB, which exceeds the size of skb->cb. The size of skb->cb is increased to 48b. Apparently the IPv6 mobile extensions need some more room anyway. Signed-off-by:
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Patrick McHardy authored
Reset IPSKB_XFRM_TUNNEL_SIZE flags in ipip and ip_gre hard_start_xmit function before the packet reenters IP. This is neccessary so the encapsulated packets are checked not to be oversized in xfrm4_output.c again. Reset all flags in sit when a packet changes its address family. Also remove some obsolete IPSKB flags. Signed-off-by:
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Patrick McHardy authored
When the innermost transform uses transport mode the decapsulated packet is not visible to netfilter. Pass the packet through the PRE_ROUTING and LOCAL_IN hooks again before handing it to upper layer protocols to make netfilter-visibility symetrical to the output path. Signed-off-by:
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Patrick McHardy authored
Move nextheader offset to the IP6CB to make it possible to pass a packet to ip6_input_finish multiple times and have it skip already parsed headers. As a nice side effect this gets rid of the manual hopopts skipping in ip6_input_finish. Signed-off-by:
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Patrick McHardy authored
Call netfilter hooks before IPsec transforms. Packets visit the FORWARD/LOCAL_OUT and POST_ROUTING hook before the first encapsulation and the LOCAL_OUT and POST_ROUTING hook before each following tunnel mode transform. Patch from Herbert Xu <herbert@gondor.apana.org.au>: Move the loop from dst_output into xfrm4_output/xfrm6_output since they're the only ones who need to it. xfrm{4,6}_output_one() processes the first SA all subsequent transport mode SAs and is called in a loop that calls the netfilter hooks between each two calls. In order to avoid the tail call issue, I've added the inline function nf_hook which is nf_hook_slow plus the empty list check. Signed-off-by: -
Luiz Capitulino authored
security/selinux/xfrm.c:155:10: warning: Using plain integer as NULL pointer Signed-off-by:
Luiz Capitulino <lcapitulino@mandriva.com.br> Signed-off-by:
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David S. Miller authored
Reported by Dave Jones. Signed-off-by: -
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Linus Torvalds authored
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Linus Torvalds authored
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Linus Torvalds authored
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Knut Petersen authored
Nothing prevents a user to modprobe a framebuffer driver from e.g. the xterm prompt. As a result, the set_par() function of the driver will be called from fbcon_init(). This is fatal as a lot of X / framebuffer combinations are unable to recover from set_par() reprogramming the graphics controller in KD_GRAPHICS mode. It is also unnecessary as the set_par() function will be called during a switch to KD_TEXT anyway. Because of this no side effects are possible. Signed-off-by:
Knut Petersen <Knut_Petersen@t-online.de> Signed-off-by:
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