- 23 Jun, 2005 37 commits
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Andy Whitcroft authored
Provide an implementation of early_pfn_to_nid for PPC64. This is used by memory models to determine the node from which to take allocations before the memory allocators are fully initialised. Signed-off-by:
Andy Whitcroft <apw@shadowen.org> Signed-off-by:
Dave Hansen <haveblue@us.ibm.com> Signed-off-by:
Martin Bligh <mbligh@aracnet.com> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Andy Whitcroft authored
Make sparse's initalization be accessible at runtime. This allows sparse mappings to be created after boot in a hotplug situation. This patch is separated from the previous one just to give an indication how much of the sparse infrastructure is *just* for hotplug memory. The section_mem_map doesn't really store a pointer. It stores something that is convenient to do some math against to get a pointer. It isn't valid to just do *section_mem_map, so I don't think it should be stored as a pointer. There are a couple of things I'd like to store about a section. First of all, the fact that it is !NULL does not mean that it is present. There could be such a combination where section_mem_map *is* NULL, but the math gets you properly to a real mem_map. So, I don't think that check is safe. Since we're storing 32-bit-aligned structures, we have a few bits in the bottom of the pointer to play with. Use one bit to encode whether there's really a mem_map there, and the other one to tell whether there's a valid section there. We need to distinguish between the two because sometimes there's a gap between when a section is discovered to be present and when we can get the mem_map for it. Signed-off-by:
Jack Steiner <steiner@sgi.com> Signed-off-by:
Bob Picco <bob.picco@hp.com> Signed-off-by:
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Andy Whitcroft authored
The part of the sparsemem patch which modifies memmap_init_zone() has recently become a problem. It changes behavior so that there is a call to pfn_to_page() for each individual page inside of a node's range: node_start_pfn through node_end_pfn. It used to simply do this once, at the beginning of the node, but having sparsemem's non-contiguous mem_map[]s inside of a node made it necessary to change. Mike Kravetz recently wrote a patch which made the NUMA code accept some new kinds of layouts. The system's memory was laid out like this, with node 0's memory in two pieces: one before and one after node 1's memory: Node 0: +++++ +++++ Node 1: +++++ Previous behavior before Mike's patch was to assign nodes like this: Node 0: 00000 XXXXX Node 1: 11111 Where the 'X' areas were simply thrown away. The new behavior was to make the pg_data_t span node 0 across all of its areas, including areas that are really node 1's: Node 0: 000000000000000 Node 1: 11111 This wastes a little bit of mem_map space, but ends up being OK, and more fully utilizes the system's memory. memmap_init_zone() initializes all of the "struct page"s for node 0, even for the "hole", but those never get used, because there is no pfn_to_page() that resolves to those pages. However, only calling pfn_to_page() once, memmap_init_zone() always uses the pages that were allocated for node0->node_mem_map because: struct page *start = pfn_to_page(start_pfn); // effectively start = &node->node_mem_map[0] for (page = start; page < (start + size); page++) { init_page_here();... page++; } Slow, and wasteful, but generally harmless. But, modify that to call pfn_to_page() for each loop iteration (like sparsemem does): for (pfn = start_pfn; pfn < < (start_pfn + size); pfn++++) { page = pfn_to_page(pfn); } And you end up trying to initialize node 1's pages too early, along with bogus data from node 0. This patch checks for those weird layouts and declines to touch the pages, making the more frequent pfn_to_page() calls OK to do. Signed-off-by: -
Andy Whitcroft authored
Provide the architecture specific implementation for SPARSEMEM for i386 SMP and NUMA systems. Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Andy Whitcroft authored
Sparsemem abstracts the use of discontiguous mem_maps[]. This kind of mem_map[] is needed by discontiguous memory machines (like in the old CONFIG_DISCONTIGMEM case) as well as memory hotplug systems. Sparsemem replaces DISCONTIGMEM when enabled, and it is hoped that it can eventually become a complete replacement. A significant advantage over DISCONTIGMEM is that it's completely separated from CONFIG_NUMA. When producing this patch, it became apparent in that NUMA and DISCONTIG are often confused. Another advantage is that sparse doesn't require each NUMA node's ranges to be contiguous. It can handle overlapping ranges between nodes with no problems, where DISCONTIGMEM currently throws away that memory. Sparsemem uses an array to provide different pfn_to_page() translations for each SECTION_SIZE area of physical memory. This is what allows the mem_map[] to be chopped up. In order to do quick pfn_to_page() operations, the section number of the page is encoded in page->flags. Part of the sparsemem infrastructure enables sharing of these bits more dynamically (at compile-time) between the page_zone() and sparsemem operations. However, on 32-bit architectures, the number of bits is quite limited, and may require growing the size of the page->flags type in certain conditions. Several things might force this to occur: a decrease in the SECTION_SIZE (if you want to hotplug smaller areas of memory), an increase in the physical address space, or an increase in the number of used page->flags. One thing to note is that, once sparsemem is present, the NUMA node information no longer needs to be stored in the page->flags. It might provide speed increases on certain platforms and will be stored there if there is room. But, if out of room, an alternate (theoretically slower) mechanism is used. This patch introduces CONFIG_FLATMEM. It is used in almost all cases where there used to be an #ifndef DISCONTIG, because SPARSEMEM and DISCONTIGMEM often have to compile out the same areas of code. Signed-off-by:
Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by:
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Andy Whitcroft authored
Allow architectures to indicate that they will be providing hooks to indice installed memory areas, memory_present(). Provide prototypes for the i386 implementation. Signed-off-by:
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Andy Whitcroft authored
Provide a default implementation for early_pfn_to_nid returning node 0. Allow architectures to override this with their own implementation out of asm/mmzone.h. Signed-off-by:
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Mike Kravetz authored
This patch changes some of the default behavior in the ppc64 Kconfig file that was recently changed/added to 2.6.12-rc2-mm1 by Dave Hansen in preparation for SPARSEMEM. Patch allows the display of both FLAT and DISCONTIG models on pseries. As before, default is DISCONTIG for SMP and PSERIES and FLAT for others. Signed-off-by:
Mike Kravetz <kravetz@us.ibm.com> Signed-off-by:
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Dave Hansen authored
This gives DISCONTIGMEM a bit more help text to explain what it does, not just when to choose it. Signed-off-by:
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Dave Hansen authored
I got some feedback from users who think that the new "Memory Model" menu is a little invasive. This patch will hide that menu, except when CONFIG_EXPERIMENTAL is enabled *or* when an individual architecture wants it. An individual arch may want to enable it because they've removed their arch-specific DISCONTIG prompt in favor of the mm/Kconfig one. Signed-off-by:
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Dave Hansen authored
This used to be used to disable FLATMEM selection, but I decided to change it to be done generically when DISCONTIG is enabled. The option is unused, so this kills it. Signed-off-by:
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Dave Hansen authored
The following patch applies on top of 2.6.12-rc2-mm1. It fixes a minor user interaction issue, and an early reference to SPARSEMEM. This "choice" menu would always default to FLATMEM, as it was listed first. Move it to the end so that the other defaults have a chance first. Signed-off-by:
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Dave Hansen authored
There is some confusion that arose when working on SPARSEMEM patch between what is needed for DISCONTIG vs. NUMA. Multiple pg_data_t's are needed for DISCONTIGMEM or NUMA, independently. All of the current NUMA implementations require an implementation of DISCONTIG. Because of this, quite a lot of code which is really needed for NUMA is actually under DISCONTIG #ifdefs. For SPARSEMEM, we changed some of these #ifdefs to CONFIG_NUMA, but that broke the DISCONTIG=y and NUMA=n case. Introducing this new NEED_MULTIPLE_NODES config option allows code that is needed for both NUMA or DISCONTIG to be separated out from code that is specific to DISCONTIG. One great advantage of this approach is that it doesn't require every architecture to be converted over. All of the current implementations should "just work", only the ones implementing SPARSEMEM will have to be fixed up. The change to free_area_init() makes it work inside, or out of the new config option. Signed-off-by:
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Dave Hansen authored
This will at least suppress one prompt that users would have received the first time they compile with the new DISCONTIG arch option. They'll still get the "Memory Model" prompt, but 99% of them will have the default work there. Signed-off-by:
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Dave Hansen authored
For all architectures, this just means that you'll see a "Memory Model" choice in your architecture menu. For those that implement DISCONTIGMEM, you may eventually want to make your ARCH_DISCONTIGMEM_ENABLE a "def_bool y" and make your users select DISCONTIGMEM right out of the new choice menu. The only disadvantage might be if you have some specific things that you need in your help option to explain something about DISCONTIGMEM. Signed-off-by:
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Dave Hansen authored
With sparsemem being introduced, we need a central place for new memory-related .config options: mm/Kconfig. This allows us to remove many of the duplicated arch-specific options. The new option, CONFIG_FLATMEM, is there to enable us to detangle NUMA and DISCONTIGMEM. This is a requirement for sparsemem because sparsemem uses the NUMA code without the presence of DISCONTIGMEM. The sparsemem patches use CONFIG_FLATMEM in generic code, so this patch is a requirement before applying them. Almost all places that used to do '#ifndef CONFIG_DISCONTIGMEM' should use '#ifdef CONFIG_FLATMEM' instead. Signed-off-by:
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Dave Hansen authored
discontig.c has some assumptions that mem_map[]s inside of a node are contiguous. Teach it to make sure that each region that it's bringing online is actually made up of valid ranges of ram. Written-by:
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Dave Hansen authored
Generify the value fields in the page_flags. The aim is to allow the location and size of these fields to be varied. Additionally we want to move away from fixed allocations per field whilst still enforcing the overall bit utilisation limits. We rely on the compiler to spot and optimise the accessor functions. Signed-off-by:
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Dave Hansen authored
Introduce a simple allocator for the NUMA remap space. This space is very scarce, used for structures which are best allocated node local. This mechanism is also used on non-NUMA ia64 systems with a vmem_map to keep the pgdat->node_mem_map initialized in a consistent place for all architectures. Issues: o alloc_remap takes a node_id where we might expect a pgdat which was intended to allow us to allocate the pgdat's using this mechanism; which we do not yet do. Could have alloc_remap_node() and alloc_remap_nid() for this purpose. Signed-off-by:
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Dave Hansen authored
The following four patches provide the last needed changes before the introduction of sparsemem. For a more complete description of what this will do, please see this patch: http://www.sr71.net/patches/2.6.11/2.6.11-bk7-mhp1/broken-out/B-sparse-150-sparsemem.patch or previous posts on the subject: http://marc.theaimsgroup.com/?t=110868540700001&r=1&w=2 http://marc.theaimsgroup.com/?l=linux-mm&m=109897373315016&w=2 Three of these are i386-only, but one of them reorganizes the macros used to manage the space in page->flags, and will affect all platforms. There are analogous patches to the i386 ones for ppc64, ia64, and x86_64, but those will be submitted by the normal arch maintainers. The combination of the four patches has been test-booted on a variety of i386 hardware, and compiled for ppc64, i386, and x86-64 with about 17 different .configs. It's also been runtime-tested on ia64 configs (with more patches on top). This patch: We _know_ which node pages in general belong to, at least at a very gross level in node_{start,end}_pfn[]. Use those to target the allocations of pages. Signed-off-by:
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Dave Hansen authored
This patch effectively eliminates direct use of pgdat->node_mem_map outside of the DISCONTIG code. On a flat memory system, these fields aren't currently used, neither are they on a sparsemem system. There was also a node_mem_map(nid) macro on many architectures. Its use along with the use of ->node_mem_map itself was not consistent. It has been removed in favor of two new, more explicit, arch-independent macros: pgdat_page_nr(pgdat, pagenr) nid_page_nr(nid, pagenr) I called them "pgdat" and "nid" because we overload the term "node" to mean "NUMA node", "DISCONTIG node" or "pg_data_t" in very confusing ways. I believe the newer names are much clearer. These macros can be overridden in the sparsemem case with a theoretically slower operation using node_start_pfn and pfn_to_page(), instead. We could make this the only behavior if people want, but I don't want to change too much at once. One thing at a time. This patch removes more code than it adds. Compile tested on alpha, alpha discontig, arm, arm-discontig, i386, i386 generic, NUMAQ, Summit, ppc64, ppc64 discontig, and x86_64. Full list here: http://sr71.net/patches/2.6.12/2.6.12-rc1-mhp2/configs/ Boot tested on NUMAQ, x86 SMP and ppc64 power4/5 LPARs. Signed-off-by:
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Linus Torvalds authored
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Mitch Williams authored
This patch fixes an obvious and nasty bug where we could exit the transmit routine while holding tx_lock. Signed-off-by:Mitch Williams <mitch.a.williams@intel.com>
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Linus Torvalds authored
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Greg Kroah-Hartman authored
Don't error out if something "bad" happens when trying to bind a driver to a device. We want the sysfs attributes to be present for later when we try to tear down the device. Signed-off-by:Greg Kroah-Hartman <gregkh@suse.de>
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Stelian Pop authored
Drivers need to return -ENODEV when they can't bind to a device. Anything else stops the "bind a device to a driver" search. From: Stelian Pop <stelian@popies.net> Signed-off-by: -
Nishanth Aravamudan authored
Use ssleep() / msleep() [as appropriate] instead of schedule_timeout() to guarantee the task delays as expected. Signed-off-by:
Nishanth Aravamudan <nacc@us.ibm.com> Acked-by:
Arnaldo Carvalho de Melo <acme@conectiva.com.br> Signed-off-by:
Maximilian Attems <janitor@sternwelten.at> Signed-off-by:
Domen Puncer <domen@coderock.org> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Shaun Pereira authored
This patch is a follow up to patch 1 regarding "Selective Sub Address matching with call user data". It allows use of the Fast-Select-Acceptance optional user facility for X.25. This patch just implements fast select with no restriction on response (NRR). What this means (according to ITU-T Recomendation 10/96 section 6.16) is that if in an incoming call packet, the relevant facility bits are set for fast-select-NRR, then the called DTE can issue a direct response to the incoming packet using a call-accepted packet that contains call-user-data. This patch allows such a response. The called DTE can also respond with a clear-request packet that contains call-user-data. However, this feature is currently not implemented by the patch. How is Fast Select Acceptance used? By default, the system does not allow fast select acceptance (as before). To enable a response to fast select acceptance, After a listen socket in created and bound as follows socket(AF_X25, SOCK_SEQPACKET, 0); bind(call_soc, (struct sockaddr *)&locl_addr, sizeof(locl_addr)); but before a listen system call is made, the following ioctl should be used. ioctl(call_soc,SIOCX25CALLACCPTAPPRV); Now the listen system call can be made listen(call_soc, 4); After this, an incoming-call packet will be accepted, but no call-accepted packet will be sent back until the following system call is made on the socket that accepts the call ioctl(vc_soc,SIOCX25SENDCALLACCPT); The network (or cisco xot router used for testing here) will allow the application server's call-user-data in the call-accepted packet, provided the call-request was made with Fast-select NRR. Signed-off-by:
Shaun Pereira <spereira@tusc.com.au> Signed-off-by:
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Shaun Pereira authored
From: Shaun Pereira <spereira@tusc.com.au> This is the first (independent of the second) patch of two that I am working on with x25 on linux (tested with xot on a cisco router). Details are as follows. Current state of module: A server using the current implementation (2.6.11.7) of the x25 module will accept a call request/ incoming call packet at the listening x.25 address, from all callers to that address, as long as NO call user data is present in the packet header. If the server needs to choose to accept a particular call request/ incoming call packet arriving at its listening x25 address, then the kernel has to allow a match of call user data present in the call request packet with its own. This is required when multiple servers listen at the same x25 address and device interface. The kernel currently matches ALL call user data, if present. Current Changes: This patch is a follow up to the patch submitted previously by Andrew Hendry, and allows the user to selectively control the number of octets of call user data in the call request packet, that the kernel will match. By default no call user data is matched, even if call user data is present. To allow call user data matching, a cudmatchlength > 0 has to be passed into the kernel after which the passed number of octets will be matched. Otherwise the kernel behavior is exactly as the original implementation. This patch also ensures that as is normally the case, no call user data will be present in the Call accepted / call connected packet sent back to the caller Future Changes on next patch: There are cases however when call user data may be present in the call accepted packet. According to the X.25 recommendation (ITU-T 10/96) section 5.2.3.2 call user data may be present in the call accepted packet provided the fast select facility is used. My next patch will include this fast select utility and the ability to send up to 128 octets call user data in the call accepted packet provided the fast select facility is used. I am currently testing this, again with xot on linux and cisco. Signed-off-by:
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James Lamanna authored
From: jlamanna@gmail.com ebtables.c vfree() checking cleanups. Signed-off by: James Lamanna <jlamanna@gmail.com> Signed-off-by:
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Nishanth Aravamudan authored
From: Nishanth Aravamudan <nacc@us.ibm.com> Use msleep() instead of schedule_timeout() to guarantee the task delays as expected. The current code is not wrong, but it does not account for early return due to signals, so I think msleep() should be appropriate. Signed-off-by:
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Chuck Short authored
Signed-off by: Chuck Short <zulcss@gmail.com> Signed-off-by: -
Jeff Moyer authored
This patch provides support for registering multiple netpoll clients to the same network device. Only one of these clients may register an rx_hook, however. In practice, this restriction has not been problematic. It is worth mentioning, though, that the current design can be easily extended to allow for the registration of multiple rx_hooks. The basic idea of the patch is that the rx_np pointer in the netpoll_info structure points to the struct netpoll that has rx_hook filled in. Aside from this one case, there is no need for a pointer from the struct net_device to an individual struct netpoll. A lock is introduced to protect the setting and clearing of the np_rx pointer. The pointer will only be cleared upon netpoll client module removal, and the lock should be uncontested. Signed-off-by:
Jeff Moyer <jmoyer@redhat.com> Signed-off-by:
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Jeff Moyer authored
This patch introduces a netpoll_info structure, which the struct net_device will now point to instead of pointing to a struct netpoll. The reason for this is two-fold: 1) fields such as the rx_flags, poll_owner, and poll_lock should be maintained per net_device, not per netpoll; and 2) this is a first step in providing support for multiple netpoll clients to register against the same net_device. The struct netpoll is now pointed to by the netpoll_info structure. As such, the previous behaviour of the code is preserved. Signed-off-by:
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Jeff Moyer authored
This trivial patch moves the assignment of poll_owner to -1 inside of the lock. This fixes a potential SMP race in the code. Signed-off-by:
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Christoph Lameter authored
The boot_pageset needs to be preserved for hotplugging and for off line processors and nodes. Otherwise pointers will point into memory that has now a different use. /proc/zoneinfo is currently showing strange results if processors / nodes are not present. Signed-off-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
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- 22 Jun, 2005 3 commits
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Linus Torvalds authored
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Eric Dumazet authored
Small patch to save an unecessary call to strlen() : sprintf() gave us the length, just trust it. Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Signed-off-by:
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