- 05 Feb, 2008 40 commits
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Hugh Dickins authored
Provided that CONFIG_HIGHPTE is not set, unuse_pte_range can reduce latency in swapoff by scanning the page table preemptibly: so long as unuse_pte is careful to recheck that entry under pte lock. (To tell the truth, this patch was not inspired by any cries for lower latency here: rather, this restructuring permits a future memory controller patch to allocate with GFP_KERNEL in unuse_pte, where before it could not. But it would be wrong to tuck this change away inside a memcgroup patch.) Signed-off-by:
Hugh Dickins <hugh@veritas.com> Acked-by:
Balbir Singh <balbir@linux.vnet.ibm.com> Tested-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Hugh Dickins authored
valid_swaphandles is supposed to do a quick pass over the swap map entries neigbouring the entry which swapin_readahead is targetting, to determine for it a range worth reading all together. But since it always starts its search from the beginning of the swap "cluster", a reject (free entry) there immediately curtails the readaround, and every swapin_readahead from that cluster is for just a single page. Instead scan forwards and backwards around the target entry. Use better names for some variables: a swap_info pointer is usually called "si" not "swapdev". And at the end, if only the target page should be read, return count of 0 to disable readaround, to avoid the unnecessarily repeated call to read_swap_cache_async. Signed-off-by:
Rik van Riel <riel@surriel.com> Signed-off-by:
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Hugh Dickins authored
With the old aops, writing to a tmpfs file had to use its own special method: the generic method would pass in a fresh page to prepare_write when the right page was there in swapcache - which was inefficient to handle, even once we'd concocted the code to handle it. With the new aops, the generic method uses shmem_write_end, which lets shmem_getpage find the right page: so now abandon shmem_file_write in favour of the generic method. Yes, that does do several things that tmpfs hasn't really needed (notably balance_dirty_pages_ratelimited, which ramfs also calls); but more use of common code is preferable. Signed-off-by:
Rik van Riel <riel@redhat.com> Signed-off-by:
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Hugh Dickins authored
In the new aops, write_begin is supposed to return the page locked: though I've seen no ill effects, that's been overlooked in the case of shmem_write_begin, and should be fixed. Then shmem_write_end must unlock the page: do so _after_ updating i_size, as we found to be important in other filesystems (though since shmem pages don't go the usual writeback route, they never suffered from that corruption). For shmem_write_begin to return the page locked, we need shmem_getpage to return the page locked in SGP_WRITE case as well as SGP_CACHE case: let's simplify the interface and return it locked even when SGP_READ. Signed-off-by:
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Hugh Dickins authored
Remove SGP_QUICK from the sgp_type enum: it was for shmem_populate and has no users now. Remove SGP_FAULT from the enum: SGP_CACHE does just as well (and shmem_getpage is about to return with page always locked). Signed-off-by:
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Hugh Dickins authored
Building in a filesystem on a loop device on a tmpfs file can hang when swapping, the loop thread caught in that infamous throttle_vm_writeout. In theory this is a long standing problem, which I've either never seen in practice, or long ago suppressed the recollection, after discounting my load and my tmpfs size as unrealistically high. But now, with the new aops, it has become easy to hang on one machine. Loop used to grab_cache_page before the old prepare_write to tmpfs, which seems to have been enough to free up some memory for any swapin needed; but the new write_begin lets tmpfs find or allocate the page (much nicer, since grab_cache_page missed tmpfs pages in swapcache). When allocating a fresh page, tmpfs respects loop's mapping_gfp_mask, which has __GFP_IO|__GFP_FS stripped off, and throttle_vm_writeout is designed to break out when __GFP_IO or GFP_FS is unset; but when tmfps swaps in, read_swap_cache_async allocates with GFP_HIGHUSER_MOVABLE regardless of the mapping_gfp_mask - hence the hang. So, pass gfp_mask down the line from shmem_getpage to shmem_swapin to swapin_readahead to read_swap_cache_async to add_to_swap_cache. Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by:
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Hugh Dickins authored
swapin_readahead has never sat well in mm/memory.c: move it to mm/swap_state.c beside its kindred read_swap_cache_async. Why were its args in a different order? rearrange them. And since it was always followed by a read_swap_cache_async of the target page, fold that in and return struct page*. Then CONFIG_SWAP=n no longer needs valid_swaphandles and read_swap_cache_async stubs. Signed-off-by:
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Hugh Dickins authored
For three years swapin_readahead has been cluttered with fanciful CONFIG_NUMA code, advancing addr, and stepping on to the next vma at the boundary, to line up the mempolicy for each page allocation. It _might_ be a good idea to allocate swap more according to vma layout; but the fact is, that's not how we do it at all, 2.6 even less than 2.4: swap is allocated as needed for pages as they sink to the bottom of the inactive LRUs. Sometimes that may match vma layout, but not so often that it's worth going to these misleading vma->vm_next lengths: rip all that out. Originally I intended to retain the incrementation of addr, but correct its initial value: valid_swaphandles generally supplies an offset below the target addr (this is readaround rather than readahead), but addr has not been adjusted accordingly, so in the interleave case it has usually been allocating the target page from the "wrong" node (though that may not matter very much). But look at the equivalent shmem_swapin code: either by oversight or by design, though it has all the apparatus for choosing a new mempolicy per page, it uses the same idx throughout, choosing the same mempolicy and interleave node for each page of the cluster. Which is actually a much better strategy: each node has its own LRUs and its own kswapd, so if you're betting on any particular relationship between swap and node, the best bet is that nearby swap entries belong to pages from the same node - even when the mempolicy of the target page is to interleave. And examining a map of nodes corresponding to swap entries on a numa=fake system bears this out. (We could later tweak swap allocation to make it even more likely, but this patch is merely about removing cruft.) So, neither adjust nor increment addr in swapin_readahead, and then shmem_swapin can use it too; the pseudo-vma to pass policy need only be set up once per cluster, and so few fields of pvma are used, let's skip the memset - from shmem_alloc_page also. Signed-off-by:
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Ken Chen authored
Allow sticky directory mount option for hugetlbfs. This allows admin to create a shared hugetlbfs mount point for multiple users, while prevent accidental file deletion that users may step on each other. It is similiar to default tmpfs mount option, or typical option used on /tmp. Signed-off-by:
Ken Chen <kenchen@google.com> Cc: Badari Pulavarty <pbadari@us.ibm.com> Cc: Adam Litke <agl@us.ibm.com> Cc: David Gibson <hermes@gibson.dropbear.id.au> Cc: William Lee Irwin III <wli@holomorphy.com> Signed-off-by:
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Christoph Lameter authored
The constructor for buffer_head slabs was removed recently. We need the constructor back in slab defrag in order to insure that slab objects always have a definite state even before we allocated them. I think we mistakenly merged the removal of the constuctor into a cleanup patch. You (ie: akpm) had a test that showed that the removal of the constructor led to a small regression. The prior state makes things easier for slab defrag. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Christoph Lameter <clameter@sgi.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by:
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Christoph Lameter authored
Both slab defrag and the large blocksize patches need to ability to take refcounts on compound pages. May be useful in other places as well. Signed-off-by:
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Christoph Lameter authored
The page array is repeatedly indexed both in vunmap and vmalloc_area_node(). Add a temporary variable to make it easier to read (and easier to patch later). Signed-off-by:
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Christoph Lameter authored
Checking if an address is a vmalloc address is done in a couple of places. Define a common version in mm.h and replace the other checks. Again the include structures suck. The definition of VMALLOC_START and VMALLOC_END is not available in vmalloc.h since highmem.c cannot be included there. Signed-off-by:
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Christoph Lameter authored
pgtable.h does not include highmem.h but uses various constants from highmem.h. We cannot include highmem.h because highmem.h will in turn include many other include files that also depend on pgtable.h So move the definitions from highmem.h into pgtable.h. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
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Christoph Lameter authored
Make vmalloc functions work the same way as kfree() and friends that take a const void * argument. [akpm@linux-foundation.org: fix consts, coding-style] Signed-off-by:
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Christoph Lameter authored
We already have page table manipulation for vmalloc in vmalloc.c. Move the vmalloc_to_page() function there as well. Move the definitions for vmalloc related functions in mm.h to a newly created section. A better place would be vmalloc.h but mm.h is basic and may depend on these functions. An alternative would be to include vmalloc.h in mm.h (like done for vmstat.h). Signed-off-by:
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Christoph Lameter authored
Simplify page cache zeroing of segments of pages through 3 functions zero_user_segments(page, start1, end1, start2, end2) Zeros two segments of the page. It takes the position where to start and end the zeroing which avoids length calculations and makes code clearer. zero_user_segment(page, start, end) Same for a single segment. zero_user(page, start, length) Length variant for the case where we know the length. We remove the zero_user_page macro. Issues: 1. Its a macro. Inline functions are preferable. 2. The KM_USER0 macro is only defined for HIGHMEM. Having to treat this special case everywhere makes the code needlessly complex. The parameter for zeroing is always KM_USER0 except in one single case that we open code. Avoiding KM_USER0 makes a lot of code not having to be dealing with the special casing for HIGHMEM anymore. Dealing with kmap is only necessary for HIGHMEM configurations. In those configurations we use KM_USER0 like we do for a series of other functions defined in highmem.h. Since KM_USER0 is depends on HIGHMEM the existing zero_user_page function could not be a macro. zero_user_* functions introduced here can be be inline because that constant is not used when these functions are called. Also extract the flushing of the caches to be outside of the kmap. [akpm@linux-foundation.org: fix nfs and ntfs build] [akpm@linux-foundation.org: fix ntfs build some more] Signed-off-by: -
David Brownell authored
Teach AVR32 to use the "GPIO Library" when exposing its GPIOs, so that signals on external chips (like GPIO expanders) can easily be used. This mostly reorganizes some existing logic, with two minor changes in behavior: - The PSR registers are used instead of the previous "gpio_mask" values, matching AT91 behavior and removing some duplication between that role and that of "pinmux_mask". - NR_IRQs grew to acommodate a bank of external GPIOs. Eventually this number should probably become a board-specific config option. There's a debugfs dump of status for the built-in GPIOs, showing which pins have deglitching, pullups, or open drain drive enabled, as well as the ID string used when requesting each IRQ. Signed-off-by:
David Brownell <dbrownell@users.sourceforge.net> Acked-by:
Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Jean Delvare <khali@linux-fr.org> Cc: Eric Miao <eric.miao@marvell.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Philipp Zabel <philipp.zabel@gmail.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ben Gardner <bgardner@wabtec.com> Signed-off-by:
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eric miao authored
Use drivers/gpio/pca9539.c instead. Signed-off-by:
eric miao <eric.miao@marvell.com> Acked-by:
Ben Gardner <bgardner@wabtec.com> Acked-by:
Jean Delvare <khali@linux-fr.org> Signed-off-by:
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eric miao authored
This adds a new-style I2C driver with basic support for the sixteen bit PCA9539 GPIO expanders. These chips have multiple registers, push-pull output drivers, and (not supported in this patch) pin change interrupts. Board-specific code must provide "pca9539_platform_data" with each chip's "i2c_board_info". That provides the GPIO numbers to be used by that chip, and callbacks for board-specific setup/teardown logic. Derived from drivers/i2c/chips/pca9539.c (which has no current known users). This is faster and simpler; it uses 16-bit register access, and cache the OUTPUT and DIRECTION registers for fast access Signed-off-by:
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David Brownell authored
Basic driver for 8-bit SPI based MCP23S08 GPIO expander, without support for IRQs or the shared chipselect mechanism. Signed-off-by:
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David Brownell authored
This is a new-style I2C driver for most common 8 and 16 bit I2C based "quasi-bidirectional" GPIO expanders: pcf8574 or pcf8575, and several compatible models (mostly faster, supporting I2C at up to 1 MHz). The driver exposes the GPIO signals using the platform-neutral GPIO programming interface, so they are easily accessed by other kernel code. The lack of such a flexible kernel API has been a big factor in the proliferation of board-specific drivers for these chips... stuff that rarely makes it upstream since it's so ugly. This driver will let such boards use standard calls. Since it's a new-style driver, these devices must be configured as part of board-specific init. That eliminates the need for error-prone manual configuration of module parameters, and makes compatibility with legacy drivers (pcf8574.c, pc8575.c) for these chips easier (there's a clear either/or disjunction). Signed-off-by:
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Philipp Zabel authored
This adds gpiolib support for the PXA architecture: - move all GPIO API functions from generic.c into gpio.c - convert the gpio_get/set_value macros into inline functions This makes it easier to hook up GPIOs provided by external chips like ASICs and CPLDs. Signed-off-by:
Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by:
Russell King <rmk+kernel@arm.linux.org.uk> Cc: Jean Delvare <khali@linux-fr.org> Cc: Eric Miao <eric.miao@marvell.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Ben Gardner <bgardner@wabtec.com> Signed-off-by:
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David Brownell authored
Update Documentation/gpio.txt, primarily to include the new "gpiolib" infrastructure. Signed-off-by:
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David Brownell authored
Provide new implementation infrastructure that platforms may choose to use when implementing the GPIO programming interface. Platforms can update their GPIO support to use this. In many cases the incremental cost to access a non-inlined GPIO should be less than a dozen instructions, with the memory cost being about a page (total) of extra data and code. The upside is: * Providing two features which were "want to have (but OK to defer)" when GPIO interfaces were first discussed in November 2006: - A "struct gpio_chip" to plug in GPIOs that aren't directly supported by SOC platforms, but come from FPGAs or other multifunction devices using conventional device registers (like UCB-1x00 or SM501 GPIOs, and southbridges in PCs with more open specs than usual). - Full support for message-based GPIO expanders, where registers are accessed through sleeping I/O calls. Previous support for these "cansleep" calls was just stubs. (One example: the widely used pcf8574 I2C chips, with 8 GPIOs each.) * Including a non-stub implementation of the gpio_{request,free}() calls, making those calls much more useful. The diagnostic labels are also recorded given DEBUG_FS, so /sys/kernel/debug/gpio can show a snapshot of all GPIOs known to this infrastructure. The driver programming interfaces introduced in 2.6.21 do not change at all; this infrastructure is entirely below those covers. Signed-off-by: -
David Brownell authored
Add an empty drivers/gpio directory for gpiolib infrastructure and GPIO expanders. It will be populated by later patches. This won't be the only place to hold such gpio_chip code. Many external chips add a few GPIOs as secondary functionality (such as MFD drivers) and platform code frequently needs to closely integrate GPIO and IRQ support. This is placed *early* in the build/link sequence since it's common for other drivers to depend on GPIOs to do their work, so they must be initialized early in the device_initcall() sequence. Signed-off-by:
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FUJITA Tomonori authored
This is a one-line patch to add the following to __scsi_alloc_queue(): dma_set_seg_boundary(dev, shost->dma_boundary); This is the simplest approach but the result looks odd, __scsi_alloc_queue() does: blk_queue_segment_boundary(q, shost->dma_boundary); dma_set_seg_boundary(dev, shost->dma_boundary); blk_queue_max_segment_size(q, dma_get_max_seg_size(dev)); I think that it would be better to set up segment boundary in the same way as we did for the maximum segment size. That is, removing shost->dma_boundary and LLDs call pci_set_dma_seg_boundary (or its friends). Then __scsi_alloc_queue() can set up both limits in the same way: blk_queue_segment_boundary(q, dma_get_seg_boundary(dev)); blk_queue_max_segment_size(q, dma_get_max_seg_size(dev)); killing dma_boundary in scsi_host_template needs a large patch for libata (dma_boundary is used by only libata and sym53c8xx). I'll send a patch to do that if it is acceptable. James and Jeff? Signed-off-by:
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Greg KH <greg@kroah.com> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by:
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FUJITA Tomonori authored
This patch makes swiotlb not allocate a memory area spanning LLD's segment boundary. is_span_boundary() judges whether a memory area spans LLD's segment boundary. If map_single finds such a area, map_single tries to find the next available memory area. Signed-off-by:
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FUJITA Tomonori authored
This adds PCI's accessor for segment_boundary_mask in device_dma_parameters. The default segment_boundary is set to 0xffffffff, same to the block layer's default value (and the scsi mid layer uses the same value). Signed-off-by:
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FUJITA Tomonori authored
This adds new accessors for segment_boundary_mask in device_dma_parameters structure in the same way I did for max_segment_size. So we can easily change where to place struct device_dma_parameters in the future. dma_get_segment boundary returns 0xffffffff if dma_parms in struct device isn't set up properly. 0xffffffff is the default value used in the block layer and the scsi mid layer. Signed-off-by:
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FUJITA Tomonori authored
This kills unused __clear_bit_string and find_next_zero_string (they were used by only gart and calgary IOMMUs). Signed-off-by:
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FUJITA Tomonori authored
This patch converts gart IOMMU to use the IOMMU helper functions. The IOMMU doesn't allocate a memory area spanning LLD's segment boundary anymore. Signed-off-by:
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FUJITA Tomonori authored
This patch converts calgary IOMMU to use the IOMMU helper functions. The IOMMU doesn't allocate a memory area spanning LLD's segment boundary anymore. Signed-off-by:
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FUJITA Tomonori authored
Previously, during initialization of the IOMMU tables, the last entry at each 4GB boundary is marked as used since there are many adapters which cannot handle DMAing across any 4GB boundary. The IOMMU doesn't allocate a memory area spanning LLD's segment boundary anymore. The segment boundary of devices are set to 4GB by default. So we can remove 4GB boundary protection now. Signed-off-by:
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FUJITA Tomonori authored
This patch converts PPC's IOMMU to use the IOMMU helper functions. The IOMMU doesn't allocate a memory area spanning LLD's segment boundary anymore. iseries_hv_alloc and iseries_hv_map don't have proper device struct. 4GB boundary is used for them. Signed-off-by:
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FUJITA Tomonori authored
This adds IOMMU helper functions for the free area management. These functions take care of LLD's segment boundary limit for IOMMUs. They would be useful for IOMMUs that use bitmap for the free area management. Signed-off-by:
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FUJITA Tomonori authored
This sets the segment size limit properly via pci_set_dma_max_seg_size and remove blk_queue_max_segment_size because scsi-ml calls it. Signed-off-by:
Jens Axboe <jens.axboe@oracle.com> Acked-by:
"Salyzyn, Mark" <mark_salyzyn@adaptec.com> Signed-off-by:
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FUJITA Tomonori authored
This sets the segment size limit properly via pci_set_dma_max_seg_size and remove blk_queue_max_segment_size because scsi-ml calls it. Signed-off-by:
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FUJITA Tomonori authored
request_queue and device struct must have the same value of a segment size limit. This patch adds blk_queue_segment_boundary in __scsi_alloc_queue so LLDs don't need to call both blk_queue_segment_boundary and set_dma_max_seg_size. A LLD can change the default value (64KB) can call device_dma_parameters accessors like pci_set_dma_max_seg_size when allocating scsi_host. Signed-off-by:
Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Acked-by:
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FUJITA Tomonori authored
This patch makes iommu respect segment size limits when merging sg lists. Signed-off-by:
Grant Grundler <grundler@parisc-linux.org> Cc: Matthew Wilcox <willy@debian.org> Signed-off-by:
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