- 11 Feb, 2007 27 commits
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Eric Paris authored
Reading /proc/sys/kernel/cap-bound requires CAP_SYS_MODULE. (see proc_dointvec_bset in kernel/sysctl.c) sysctl appears to drive all over proc reading everything it can get it's hands on and is complaining when it is being denied access to read cap-bound. Clearly writing to cap-bound should be a sensitive operation but requiring CAP_SYS_MODULE to read cap-bound seems a bit to strong. I believe the information could with reasonable certainty be obtained by looking at a bunch of the output of /proc/pid/status which has very low security protection, so at best we are just getting a little obfuscation of information. Currently SELinux policy has to 'dontaudit' capability checks for CAP_SYS_MODULE for things like sysctl which just want to read cap-bound. In doing so we also as a byproduct have to hide warnings of potential exploits such as if at some time that sysctl actually tried to load a module. I wondered if anyone would have a problem opening cap-bound up to read from anyone? Acked-by:
Chris Wright <chrisw@sous-sol.org> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: James Morris <jmorris@namei.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Ken Chen authored
When kernel unmaps an address range, it needs to transfer PTE state into page struct. Currently, kernel transfer access bit via mark_page_accessed(). The call to mark_page_accessed in the unmap path doesn't look logically correct. At unmap time, calling mark_page_accessed will causes page LRU state to be bumped up one step closer to more recently used state. It is causing quite a bit headache in a scenario when a process creates a shmem segment, touch a whole bunch of pages, then unmaps it. The unmapping takes a long time because mark_page_accessed() will start moving pages from inactive to active list. I'm not too much concerned with moving the page from one list to another in LRU. Sooner or later it might be moved because of multiple mappings from various processes. But it just doesn't look logical that when user asks a range to be unmapped, it's his intention that the process is no longer interested in these pages. Moving those pages to active list (or bumping up a state towards more active) seems to be an over reaction. It also prolongs unmapping latency which is the core issue I'm trying to solve. As suggested by Peter, we should still preserve the info on pte young pages, but not more. Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by:
Ken Chen <kenchen@google.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Ken Chen authored
As pointed out by Hugh, ramfs would also benefit from using the new set_page_dirty aop method for memory backed file systems. Signed-off-by:
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Ken Chen authored
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:
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Andy Whitcroft authored
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 <apw@shadowen.org> Acked-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
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Christoph Lameter authored
As Andi pointed out: CONFIG_GENERIC_ISA_DMA only disables the ISA DMA channel management. Other functionality may still expect GFP_DMA to provide memory below 16M. So we need to make sure that CONFIG_ZONE_DMA is set independent of CONFIG_GENERIC_ISA_DMA. Undo the modifications to mm/Kconfig where we made ZONE_DMA dependent on GENERIC_ISA_DMA and set theses explicitly in each arches Kconfig. Reviews must occur for each arch in order to determine if ZONE_DMA can be switched off. It can only be switched off if we know that all devices supported by a platform are capable of performing DMA transfers to all of memory (Some arches already support this: uml, avr32, sh sh64, parisc and IA64/Altix). In order to switch ZONE_DMA off conditionally, one would have to establish a scheme by which one can assure that no drivers are enabled that are only capable of doing I/O to a part of memory, or one needs to provide an alternate means of performing an allocation from a specific range of memory (like provided by alloc_pages_range()) and insure that all drivers use that call. In that case the arches alloc_dma_coherent() may need to be modified to call alloc_pages_range() instead of relying on GFP_DMA. Signed-off-by:
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Christoph Lameter authored
sh / sh64: Remove ZONE_DMA remains. Both arches do not need ZONE_DMA Signed-off-by:
Paul Mundt <lethal@linux-sh.org> Signed-off-by:
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Christoph Lameter authored
Remove ZONE_DMA remains from parisc so that kernels are build without ZONE_DMA. Signed-off-by:
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Christoph Lameter authored
ZONE_DMA less operation for IA64 SGI platform Disable ZONE_DMA for SGI SN2. All memory is addressable by all devices and we do not need any special memory pool. Signed-off-by:
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Christoph Lameter authored
Make ZONE_DMA optional in core code. - ifdef all code for ZONE_DMA and related definitions following the example for ZONE_DMA32 and ZONE_HIGHMEM. - Without ZONE_DMA, ZONE_HIGHMEM and ZONE_DMA32 we get to a ZONES_SHIFT of 0. - Modify the VM statistics to work correctly without a DMA zone. - Modify slab to not create DMA slabs if there is no ZONE_DMA. [akpm@osdl.org: cleanup] [jdike@addtoit.com: build fix] [apw@shadowen.org: Simplify calculation of the number of bits we need for ZONES_SHIFT] Signed-off-by:
Jeff Dike <jdike@addtoit.com> Signed-off-by:
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Christoph Lameter authored
This patch simply defines CONFIG_ZONE_DMA for all arches. We later do special things with CONFIG_ZONE_DMA after the VM and an arch are prepared to work without ZONE_DMA. CONFIG_ZONE_DMA can be defined in two ways depending on how an architecture handles ISA DMA. First if CONFIG_GENERIC_ISA_DMA is set by the arch then we know that the arch needs ZONE_DMA because ISA DMA devices are supported. We can catch this in mm/Kconfig and do not need to modify arch code. Second, arches may use ZONE_DMA in an unknown way. We set CONFIG_ZONE_DMA for all arches that do not set CONFIG_GENERIC_ISA_DMA in order to insure backwards compatibility. The arches may later undefine ZONE_DMA if their arch code has been verified to not depend on ZONE_DMA. Signed-off-by:
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Christoph Lameter authored
This patchset follows up on the earlier work in Andrew's tree to reduce the number of zones. The patches allow to go to a minimum of 2 zones. This one allows also to make ZONE_DMA optional and therefore the number of zones can be reduced to one. ZONE_DMA is usually used for ISA DMA devices. There are a number of reasons why we would not want to have ZONE_DMA 1. Some arches do not need ZONE_DMA at all. 2. With the advent of IOMMUs DMA zones are no longer needed. The necessity of DMA zones may drastically be reduced in the future. This patchset allows a compilation of a kernel without that overhead. 3. Devices that require ISA DMA get rare these days. All my systems do not have any need for ISA DMA. 4. The presence of an additional zone unecessarily complicates VM operations because it must be scanned and balancing logic must operate on its. 5. With only ZONE_NORMAL one can reach the situation where we have only one zone. This will allow the unrolling of many loops in the VM and allows the optimization of varous code paths in the VM. 6. Having only a single zone in a NUMA system results in a 1-1 correspondence between nodes and zones. Various additional optimizations to critical VM paths become possible. Many systems today can operate just fine with a single zone. If you look at what is in ZONE_DMA then one usually sees that nothing uses it. The DMA slabs are empty (Some arches use ZONE_DMA instead of ZONE_NORMAL, then ZONE_NORMAL will be empty instead). On all of my systems (i386, x86_64, ia64) ZONE_DMA is completely empty. Why constantly look at an empty zone in /proc/zoneinfo and empty slab in /proc/slabinfo? Non i386 also frequently have no need for ZONE_DMA and zones stay empty. The patchset was tested on i386 (UP / SMP), x86_64 (UP, NUMA) and ia64 (NUMA). The RFC posted earlier (see http://marc.theaimsgroup.com/?l=linux-kernel&m=115231723513008&w=2) had lots of #ifdefs in them. An effort has been made to minize the number of #ifdefs and make this as compact as possible. The job was made much easier by the ongoing efforts of others to extract common arch specific functionality. I have been running this for awhile now on my desktop and finally Linux is using all my available RAM instead of leaving the 16MB in ZONE_DMA untouched: christoph@pentium940:~$ cat /proc/zoneinfo Node 0, zone Normal pages free 4435 min 1448 low 1810 high 2172 active 241786 inactive 210170 scanned 0 (a: 0 i: 0) spanned 524224 present 524224 nr_anon_pages 61680 nr_mapped 14271 nr_file_pages 390264 nr_slab_reclaimable 27564 nr_slab_unreclaimable 1793 nr_page_table_pages 449 nr_dirty 39 nr_writeback 0 nr_unstable 0 nr_bounce 0 cpu: 0 pcp: 0 count: 156 high: 186 batch: 31 cpu: 0 pcp: 1 count: 9 high: 62 batch: 15 vm stats threshold: 20 cpu: 1 pcp: 0 count: 177 high: 186 batch: 31 cpu: 1 pcp: 1 count: 12 high: 62 batch: 15 vm stats threshold: 20 all_unreclaimable: 0 prev_priority: 12 temp_priority: 12 start_pfn: 0 This patch: In two places in the VM we use ZONE_DMA to refer to the first zone. If ZONE_DMA is optional then other zones may be first. So simply replace ZONE_DMA with zone 0. This also fixes ZONETABLE_PGSHIFT. If we have only a single zone then ZONES_PGSHIFT may become 0 because there is no need anymore to encode the zone number related to a pgdat. However, we still need a zonetable to index all the zones for each node if this is a NUMA system. Therefore define ZONETABLE_SHIFT unconditionally as the offset of the ZONE field in page flags. [apw@shadowen.org: fix mismerge] Acked-by:
Christoph Hellwig <hch@infradead.org> Signed-off-by:
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Christoph Lameter authored
Values are available via ZVC sums. Signed-off-by:
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Christoph Lameter authored
Values are readily available via ZVC per node and global sums. Signed-off-by:
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Christoph Lameter authored
Function is unnecessary now. We can use the summing features of the ZVCs to get the values we need. Signed-off-by:
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Christoph Lameter authored
nr_free_pages is now a simple access to a global variable. Make it a macro instead of a function. The nr_free_pages now requires vmstat.h to be included. There is one occurrence in power management where we need to add the include. Directly refrer to global_page_state() there to clarify why the #include was added. [akpm@osdl.org: arm build fix] [akpm@osdl.org: sparc64 build fix] Signed-off-by:
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Christoph Lameter authored
The global and per zone counter sums are in arrays of longs. Reorder the ZVCs so that the most frequently used ZVCs are put into the same cacheline. That way calculations of the global, node and per zone vm state touches only a single cacheline. This is mostly important for 64 bit systems were one 128 byte cacheline takes only 8 longs. Signed-off-by:
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Christoph Lameter authored
This is again simplifies some of the VM counter calculations through the use of the ZVC consolidated counters. [michal.k.k.piotrowski@gmail.com: build fix] Signed-off-by:
Michal Piotrowski <michal.k.k.piotrowski@gmail.com> Signed-off-by:
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Christoph Lameter authored
The determination of the dirty ratio to determine writeback behavior is currently based on the number of total pages on the system. However, not all pages in the system may be dirtied. Thus the ratio is always too low and can never reach 100%. The ratio may be particularly skewed if large hugepage allocations, slab allocations or device driver buffers make large sections of memory not available anymore. In that case we may get into a situation in which f.e. the background writeback ratio of 40% cannot be reached anymore which leads to undesired writeback behavior. This patchset fixes that issue by determining the ratio based on the actual pages that may potentially be dirty. These are the pages on the active and the inactive list plus free pages. The problem with those counts has so far been that it is expensive to calculate these because counts from multiple nodes and multiple zones will have to be summed up. This patchset makes these counters ZVC counters. This means that a current sum per zone, per node and for the whole system is always available via global variables and not expensive anymore to calculate. The patchset results in some other good side effects: - Removal of the various functions that sum up free, active and inactive page counts - Cleanup of the functions that display information via the proc filesystem. This patch: The use of a ZVC for nr_inactive and nr_active allows a simplification of some counter operations. More ZVC functionality is used for sums etc in the following patches. [akpm@osdl.org: UP build fix] Signed-off-by:
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Hugh Dickins authored
After do_wp_page has tested page_mkwrite, it must release old_page after acquiring page table lock, not before: at some stage that ordering got reversed, leaving a (very unlikely) window in which old_page might be truncated, freed, and reused in the same position. Signed-off-by:
Hugh Dickins <hugh@veritas.com> Acked-by:
Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by:
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Randy Dunlap authored
With CONFIG_SPARSEMEM=y: mm/rmap.c:579: warning: format '%lx' expects type 'long unsigned int', but argument 2 has type 'int' Make __page_to_pfn() return unsigned long. Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by:
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Andrew Morton authored
This early break prevents us from displaying info for the vm stats thresholds if the zone doesn't have any pages in its per-cpu pagesets. So my 800MB i386 box says: Node 0, zone DMA pages free 2365 min 16 low 20 high 24 active 0 inactive 0 scanned 0 (a: 0 i: 0) spanned 4096 present 4044 nr_anon_pages 0 nr_mapped 1 nr_file_pages 0 nr_slab_reclaimable 0 nr_slab_unreclaimable 0 nr_page_table_pages 0 nr_dirty 0 nr_writeback 0 nr_unstable 0 nr_bounce 0 nr_vmscan_write 0 protection: (0, 868, 868) pagesets all_unreclaimable: 0 prev_priority: 12 start_pfn: 0 Node 0, zone Normal pages free 199713 min 934 low 1167 high 1401 active 10215 inactive 4507 scanned 0 (a: 0 i: 0) spanned 225280 present 222420 nr_anon_pages 2685 nr_mapped 1110 nr_file_pages 12055 nr_slab_reclaimable 2216 nr_slab_unreclaimable 1527 nr_page_table_pages 213 nr_dirty 0 nr_writeback 0 nr_unstable 0 nr_bounce 0 nr_vmscan_write 0 protection: (0, 0, 0) pagesets cpu: 0 pcp: 0 count: 152 high: 186 batch: 31 cpu: 0 pcp: 1 count: 13 high: 62 batch: 15 vm stats threshold: 16 cpu: 1 pcp: 0 count: 34 high: 186 batch: 31 cpu: 1 pcp: 1 count: 10 high: 62 batch: 15 vm stats threshold: 16 all_unreclaimable: 0 prev_priority: 12 start_pfn: 4096 Just nuke all that search-for-the-first-non-empty-pageset code. Dunno why it was there in the first place.. Cc: Christoph Lameter <clameter@engr.sgi.com> Signed-off-by: -
Mel Gorman authored
find_min_pfn_for_node() and find_min_pfn_with_active_regions() sort early_node_map[] on every call. This is an excessive amount of sorting and that can be avoided. This patch always searches the whole early_node_map[] in find_min_pfn_for_node() instead of returning the first value found. The map is then only sorted once when required. Successfully boot tested on a number of machines. [akpm@osdl.org: cleanup] Signed-off-by:
Mel Gorman <mel@csn.ul.ie> Signed-off-by:
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Robert P. J. Day authored
Remove the last vestiges of the long-deprecated "MAP_ANON" page protection flag: use "MAP_ANONYMOUS" instead. Signed-off-by:
Robert P. J. Day <rpjday@mindspring.com> Signed-off-by:
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Christoph Lameter authored
Use the pointer passed to cache_reap to determine the work pointer and consolidate exit paths. Signed-off-by:
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Pekka Enberg authored
Clean up __cache_alloc and __cache_alloc_node functions a bit. We no longer need to do NUMA_BUILD tricks and the UMA allocation path is much simpler. No functional changes in this patch. Note: saves few kernel text bytes on x86 NUMA build due to using gotos in __cache_alloc_node() and moving __GFP_THISNODE check in to fallback_alloc(). Cc: Andy Whitcroft <apw@shadowen.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Manfred Spraul <manfred@colorfullife.com> Acked-by:
Christoph Lameter <christoph@lameter.com> Cc: Paul Jackson <pj@sgi.com> Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by:
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Pekka Enberg authored
The PageSlab debug check in kfree_debugcheck() is broken for compound pages. It is also redundant as we already do BUG_ON for non-slab pages in page_get_cache() and page_get_slab() which are always called before we free any actual objects. Signed-off-by:
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- 09 Feb, 2007 13 commits
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Jeff Garzik authored
The ATA_ENABLE_PATA define was never meant to be permanent, and in recent kernels, it's already been unconditionally enabled. Remove. Signed-off-by:Jeff Garzik <jeff@garzik.org>
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Jeff Garzik authored
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Alan authored
If we are doing a PIO setup for a CFA card and it blows up with a device error then assume it is an older CFA card which doesn't support this rather than failing the device out of existance. Stands seperate to the quieting patch but that is obviously useful with this change. Signed-off-by:
Alan Cox <alan@redhat.com> Signed-off-by:
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Robert Hancock authored
ata_pci_device_do_resume can fail if the PCI device couldn't be re-enabled. Update sata_nv to propagate the return value from this call and to not try to do any other resume activities if it fails. Fixes a compile warning. Signed-off-by:
Robert Hancock <hancockr@shaw.ca> Signed-off-by:
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Robert Hancock authored
Update sata_nv to wait for the controller to indicate via the status register that it has entered the requested state when switching between ADMA mode and register mode. This issue came up recently when debugging some problems with cache flush command timeouts and while it didn't appear to fix that problem, this is something we should likely be doing in any case. Signed-off-by:
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Robert Hancock authored
Some problems showed up recently with cache flush commands timing out on sata_nv. Previously these commands were always handled by transitioning to legacy mode from ADMA mode first. The timeout problem was worked around already by a change to the interrupt handling code for legacy mode, but for non-data commands like these it appears we can handle them in ADMA mode, so the switch to legacy mode is not needed. This patch changes the behavior so that we use ADMA mode to submit interrupt-driven commands with ATA_PROT_NODATA protocol. In addition to avoiding the problem mentioned above entirely, this avoids the overhead of switching to legacy mode and back to ADMA mode for handling cache flushes. When handling non-DMA-mapped commands, we leave the APRD blank and clear the NV_CPB_CTL_APRD_VALID field in the CPB so the controller does not attempt to read it. Signed-off-by:
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Robert Hancock authored
This cleans up a few issues with the error handling in sata_nv in ADMA mode to make it more consistent with other NCQ-capable drivers like ahci and sata_sil24: - When a command failed, we would effectively set AC_ERR_DEV on the queued command always. In the case of NCQ commands this prevents libata from doing a log page query to determine the details of the failed command, since it thinks we've already analyzed. Just set flags in the port ehi->err_mask, then freeze or abort and let libata figure out what went wrong. - The code handled NV_ADMA_STAT_CPBERR as a "really bad error" which caused it to set error flags on every queued command. I don't know exactly what this flag means (no docs, grr!) but from what I can guess from the standard ADMA spec, it just means that one or more of the CPBs had an error, so we just need to go through and do our normal checks in this case. - In the error_handler function the code would always dump the state of all the CPBs. This output seems redundant at this point since libata already dumps the state of all active commands on errors (and it also triggers at times when it shouldn't, like when suspending). Take this out. [akpm@osdl.org: many coding-style fixes] Signed-off-by:
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Sergei Shtylyov authored
MPIIX has only single channel IDE which can be configured for either primary or secondary legacy I/O ports and IRQ. So, get rid of the unneeded second probe entry in mpiix_init_one() and of the invalid (but unused anyway) enable bits in mpiix_pre_reset(). Warning: this cleanup has only been compile-tested... Signed-off-by:
Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by:
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Sergei Shtylyov authored
Fix clearing/setting the wrong TIME/IE/PPE bits for a slave drive caused by a wrong shift count. Fix the PIO mode 1 being overclocked by wrongly selecting the fast timing bank. Also, fix/rephrase some comments while at it. Signed-off-by:
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Sergei Shtylyov authored
Fix the PIO mode 2 using mode 0 timings -- this driver should enable the fast timing bank starting with PIO2, just like the ata_piix driver does. Also, fix/rephrase some comments while at it. Signed-off-by:
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Alan authored
IORDY and IORDY enable/disable flags. Signed-off-by:
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Alan authored
People are getting confused about which drivers to enable for PATA PIIX type devices. Change the ATA_PIIX line and help to make it clearer. Signed-off-by:
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Tejun Heo authored
* Hardreset must not exit without actually performing reset regardless of link status. We're resetting the link after all. * Minor message update. * 150ms delay is meaningful iff link is online after reset is complete. Signed-off-by:
Tejun Heo <htejun@gmail.com> Signed-off-by:
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