- 10 Apr, 2002 6 commits
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Andrew Morton authored
page->buffers is a bit of a layering violation. Not all address_spaces have pages which are backed by buffers. The exclusive use of page->buffers for buffers means that a piece of prime real estate in struct page is unavailable to other forms of address_space. This patch turns page->buffers into `unsigned long page->private' and sets in place all the infrastructure which is needed to allow other address_spaces to use this storage. This change alows the multipage-bio-writeout patches to use page->private to cache the results of an earlier get_block(), so repeated calls into the filesystem are not needed in the case of file overwriting. Devlopers should think carefully before calling try_to_free_buffers() or block_flushpage() or writeout_one_page() or waitfor_one_page() against a page. It's only legal to do this if you *know* that the page is buffer-backed. And only the address_space knows that. Arguably, we need new a_ops for writeout_one_page() and waitfor_one_page(). But I have more patches on the boil which obsolete these functions in favour of ->writepage() and wait_on_page(). The new PG_private page bit is used to indicate that there is something at page->private. The core kernel does not know what that object actually is, just that it's there. The kernel must call a_ops->releasepage() to try to make page->private go away. And a_ops->flushpage() at truncate time.
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Andrew Morton authored
I'd like to be able to claim amazing speedups, but the best benchmark I could find was diffing two 256 megabyte files, which is about 10% quicker. And that is probably due to the window size being effectively 50% larger. Fact is, any disk worth owning nowadays has a segmented 2-megabyte cache, and OS-level readahead mainly seems to save on CPU cycles rather than overall throughput. Once you start reading more streams than there are segments in the disk cache we start to win. Still. The main motivation for this work is to clean the code up, and to create a central point at which many pages are marshalled together so that they can all be encapsulated into the smallest possible number of BIOs, and injected into the request layer. A number of filesystems were poking around inside the readahead state variables. I'm not really sure what they were up to, but I took all that out. The readahead code manages its own state autonomously and should not need any hints. - Unifies the current three readahead functions (mmap reads, read(2) and sys_readhead) into a single implementation. - More aggressive in building up the readahead windows. - More conservative in tearing them down. - Special start-of-file heuristics. - Preallocates the readahead pages, to avoid the (never demonstrated, but potentially catastrophic) scenario where allocation of readahead pages causes the allocator to perform VM writeout. - Gets all the readahead pages gathered together in one spot, so they can be marshalled into big BIOs. - reinstates the readahead ioctls, so hdparm(8) and blockdev(8) are working again. The readahead settings are now per-request-queue, and the drivers never have to know about it. I use blockdev(8). It works in units of 512 bytes. - Identifies readahead thrashing. Also attempts to handle it. Certainly the changes here delay the onset of catastrophic readahead thrashing by quite a lot, and decrease it seriousness as we get more deeply into it, but it's still pretty bad.
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Andrew Morton authored
Before the mempool was added, the VM was getting many, many 0-order allocation failures due to the atomic ratnode allocations inside swap_out. That monster mempool is doing its job - drove a 256meg machine a gigabyte into swap with no ratnode allocation failures at all. So we do need to trim that pool a bit, and also handle the case where swap_out fails, and not just keep pointlessly calling it.
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Rusty Russell authored
This changes everything arch specific PPC and i386 which should have been unsigned long (it doesn't *matter*, but bad habits get copied to where it does matter). No object code changes
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Rusty Russell authored
This removes gratuitous & operators in front of tty->process_char_map and tty->read_flags. No object code changes
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Rusty Russell authored
This changes over some bogus casts, and converts the ext2, hfs and minix set-bit macros. Also changes pte and open_fds to hand the actual bitfield rather than whole structure. No object code changes
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- 09 Apr, 2002 7 commits
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Robert Love authored
This patch implements the following calls to set and retrieve a task's CPU affinity: int sched_setaffinity(pid_t pid, unsigned int len, unsigned long *new_mask_ptr) int ched_getaffinity(pid_t pid, unsigned int len, unsigned long *user_mask_ptr)
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Linus Torvalds authored
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Alexander Viro authored
a) part of open_namei() done after we'd found vfsmount/dentry of the object we want to open had been split into a helper - may_open(). b) do_open() in fs/nfsctl.c didn't do any permission checks on the nfsd file it was opening - sudden idiocy attack on my part (I missed the fact that dentry_open() doesn't do permission checks - open_namei() does). Fixed by adding obvious may_open() calls.
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Rusty Russell authored
As per David Mosberger's request, splits into per-arch files (solves the #include mess), and fixes my "was not an lvalue" bug.
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Linus Torvalds authored
Cosmetic change: x86_capability. Makes it an unsigned long, and removes the gratuitous & operators (it is already an array). These produce warnings when set_bit() etc. takes an unsigned long * instead of a void *. Originally from Rusty Russell
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Linus Torvalds authored
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Linus Torvalds authored
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- 10 Apr, 2002 1 commit
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Wim Van Sebroeck authored
i810_rng: add support for other i8xx chipsets to the Random Number Generator module. This is being done by adding the detection of the 82801BA(M) and 82801CA(M) I/O Controller Hub's.
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- 09 Apr, 2002 3 commits
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Martin Dalecki authored
- Eliminate the mate member of the ata_channel structure. The information provided by it is already present. This patch may have undesirable effects on the ns87415.c and trm290.c host chip drivers, but it's worth for structural reasons to have it. - Kill unused code, which was "fixing" interrupt routing from ide-pci.c Don't pass any "mate" between the functions there. - Don't define SUPPORT_VLB_SYNC unconditionally in ide-taskfile.c - Apply Vojtech Pavliks fix for piix host-chip driver crashes. - Add linux/types.h to ide-pnp.c. - Apply latest sis5513 host chip driver patch from by Lionel Bouton by hand. - Apply patch by Paul Macerras for power-mac. - Try to make the ns87415 driver a bit more reentrant.
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Linus Torvalds authored
into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux
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bk://linuxusb.bkbits.net/linus-2.5Linus Torvalds authored
into home.transmeta.com:/home/torvalds/v2.5/linux
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- 08 Apr, 2002 14 commits
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Greg Kroah-Hartman authored
cleaned up the comments to put them in proper docbook format.
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David Brownell authored
sanity checking and cleanup on device disconnect. - Splits apart usb_dec_dev_use(), for driver use, and usb_free_dev(), for hub/hcd use. Both now have kerneldoc, and will BUG() if the refcount and the device tree get out of sync. (Except for cleanup of root hub init errors, refcount must go to zero only at the instant disconnect processing completes.) - More usbcore-internal function declarations are now moved out of <linux/usb.h> into hcd.h - Driver-accessible refcounting is now inlined; minor code shrinkage, it's using atomic inc/dec instructions not function calls. <note from greg k-h, there is still some work to be done with USB device reference counting, but this patch is a step in the right direction.>
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David Brownell authored
This fixes some kerneldoc bugs for USB. It catches up with the recent rename, and includes a couple minor tweaks/fixes I happened to notice.
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Richard Gooch authored
- Documentation updates - BKL removal (devfs doesn't need the BKL) - Changed <devfs_rmdir> to allow later additions if not yet empty - Added calls to <devfs_register_partitions> in drivers/block/blkpc.c <add_partition> and <del_partition> - Bug fixes in unique number and devnum allocators.
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Brian Gerst authored
This patch moves the generation of the asm interrupt entry stubs from i8259.c to entry.S. This allows it to be done with less code and without needing duplicate definitions of SAVE_ALL, GET_CURRENT, etc.
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Andries E. Brouwer authored
It is a step on the road to removal of the arrays. It also solves other things, like the fact that Linux is unable to read the last sector of a disk or partition with an odd number of sectors.
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Anton Blanchard authored
Unfortunately the proc filesystem has a limit on the number of dynamic proc entries it can create. On large systems we can exhaust the default (4096) very quickly. The following patch increases the default to something more reasonable.
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Anton Blanchard authored
We forgot to include linux/init.h in fs/nfsd/nfsctl.c.
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Anton Blanchard authored
Since we do not set the task state to TASK_INTERRUPTIBLE, we busy loop. On larger SMP this can actually result in a lockup due to the way migration thread initalisation is done (nr_cpus threads are created and they all busy loop until the scheduler evenly distributes them, one on each cpu. With this rogue thread busy looping things can become unbalanced and the migration threads never distribute themselves onto all cpus).
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Anton Blanchard authored
include/linux/seq_file.h uses memcpy and struct semaphore and so should include the relevant files.
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Greg Kroah-Hartman authored
renamed the bluetooth.c file to bluettty.c to help prevent user confusion between this driver and the bluez bluetooth stack in the kernel.
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Dan Streetman authored
This was originally created by David many months ago and posted to the list, but not put into the kernel. I modified the original patch to: -patch against the 2.5.7 kernel -use the 'real' interface number, not position (to do this I added 2 methods in usb.c)
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Chris Hanson authored
Here is an updated patch using kmalloc that removes the page limit on bulk transfers in usbfs. I've tested it and it seems to work OK.
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Linus Torvalds authored
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- 09 Apr, 2002 1 commit
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Anton Blanchard authored
(eg ppc64) where foo points to a function descriptor and .foo is the address of the actual function.
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- 08 Apr, 2002 1 commit
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Linus Torvalds authored
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- 09 Apr, 2002 7 commits
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Anton Blanchard authored
optimisations on some architectures.
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Anton Blanchard authored
ppc64: remove local_flush_* functions, just define them directly
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Anton Blanchard authored
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Anton Blanchard authored
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Anton Blanchard authored
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Anton Blanchard authored
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Anton Blanchard authored
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