1. 09 12月, 2006 3 次提交
  2. 08 12月, 2006 1 次提交
  3. 05 10月, 2006 1 次提交
    • D
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      David Howells 提交于
      Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
      of passing regs around manually through all ~1800 interrupt handlers in the
      Linux kernel.
      
      The regs pointer is used in few places, but it potentially costs both stack
      space and code to pass it around.  On the FRV arch, removing the regs parameter
      from all the genirq function results in a 20% speed up of the IRQ exit path
      (ie: from leaving timer_interrupt() to leaving do_IRQ()).
      
      Where appropriate, an arch may override the generic storage facility and do
      something different with the variable.  On FRV, for instance, the address is
      maintained in GR28 at all times inside the kernel as part of general exception
      handling.
      
      Having looked over the code, it appears that the parameter may be handed down
      through up to twenty or so layers of functions.  Consider a USB character
      device attached to a USB hub, attached to a USB controller that posts its
      interrupts through a cascaded auxiliary interrupt controller.  A character
      device driver may want to pass regs to the sysrq handler through the input
      layer which adds another few layers of parameter passing.
      
      I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
      main part of the code on FRV and i386, though I can't test most of the drivers.
      I've also done partial conversion for powerpc and MIPS - these at least compile
      with minimal configurations.
      
      This will affect all archs.  Mostly the changes should be relatively easy.
      Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
      
      	struct pt_regs *old_regs = set_irq_regs(regs);
      
      And put the old one back at the end:
      
      	set_irq_regs(old_regs);
      
      Don't pass regs through to generic_handle_irq() or __do_IRQ().
      
      In timer_interrupt(), this sort of change will be necessary:
      
      	-	update_process_times(user_mode(regs));
      	-	profile_tick(CPU_PROFILING, regs);
      	+	update_process_times(user_mode(get_irq_regs()));
      	+	profile_tick(CPU_PROFILING);
      
      I'd like to move update_process_times()'s use of get_irq_regs() into itself,
      except that i386, alone of the archs, uses something other than user_mode().
      
      Some notes on the interrupt handling in the drivers:
      
       (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
           the input_dev struct.
      
       (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
           something different depending on whether it's been supplied with a regs
           pointer or not.
      
       (*) Various IRQ handler function pointers have been moved to type
           irq_handler_t.
      Signed-Off-By: NDavid Howells <dhowells@redhat.com>
      (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  4. 02 10月, 2006 1 次提交
  5. 01 10月, 2006 1 次提交
    • D
      [PATCH] BLOCK: Make it possible to disable the block layer [try #6] · 9361401e
      David Howells 提交于
      Make it possible to disable the block layer.  Not all embedded devices require
      it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
      the block layer to be present.
      
      This patch does the following:
      
       (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
           support.
      
       (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
           an item that uses the block layer.  This includes:
      
           (*) Block I/O tracing.
      
           (*) Disk partition code.
      
           (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
      
           (*) The SCSI layer.  As far as I can tell, even SCSI chardevs use the
           	 block layer to do scheduling.  Some drivers that use SCSI facilities -
           	 such as USB storage - end up disabled indirectly from this.
      
           (*) Various block-based device drivers, such as IDE and the old CDROM
           	 drivers.
      
           (*) MTD blockdev handling and FTL.
      
           (*) JFFS - which uses set_bdev_super(), something it could avoid doing by
           	 taking a leaf out of JFFS2's book.
      
       (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
           linux/elevator.h contingent on CONFIG_BLOCK being set.  sector_div() is,
           however, still used in places, and so is still available.
      
       (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
           parts of linux/fs.h.
      
       (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
      
       (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
      
       (*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
           is not enabled.
      
       (*) fs/no-block.c is created to hold out-of-line stubs and things that are
           required when CONFIG_BLOCK is not set:
      
           (*) Default blockdev file operations (to give error ENODEV on opening).
      
       (*) Makes some /proc changes:
      
           (*) /proc/devices does not list any blockdevs.
      
           (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
      
       (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
      
       (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
           given command other than Q_SYNC or if a special device is specified.
      
       (*) In init/do_mounts.c, no reference is made to the blockdev routines if
           CONFIG_BLOCK is not defined.  This does not prohibit NFS roots or JFFS2.
      
       (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
           error ENOSYS by way of cond_syscall if so).
      
       (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
           CONFIG_BLOCK is not set, since they can't then happen.
      Signed-Off-By: NDavid Howells <dhowells@redhat.com>
      Signed-off-by: NJens Axboe <axboe@kernel.dk>
      9361401e
  6. 26 9月, 2006 2 次提交
  7. 28 8月, 2006 1 次提交
  8. 01 7月, 2006 10 次提交
  9. 01 4月, 2006 1 次提交
  10. 29 3月, 2006 2 次提交
  11. 26 3月, 2006 1 次提交
    • A
      [PATCH] slab: implement /proc/slab_allocators · 871751e2
      Al Viro 提交于
      Implement /proc/slab_allocators.   It produces output like:
      
      idr_layer_cache: 80 idr_pre_get+0x33/0x4e
      buffer_head: 2555 alloc_buffer_head+0x20/0x75
      mm_struct: 9 mm_alloc+0x1e/0x42
      mm_struct: 20 dup_mm+0x36/0x370
      vm_area_struct: 384 dup_mm+0x18f/0x370
      vm_area_struct: 151 do_mmap_pgoff+0x2e0/0x7c3
      vm_area_struct: 1 split_vma+0x5a/0x10e
      vm_area_struct: 11 do_brk+0x206/0x2e2
      vm_area_struct: 2 copy_vma+0xda/0x142
      vm_area_struct: 9 setup_arg_pages+0x99/0x214
      fs_cache: 8 copy_fs_struct+0x21/0x133
      fs_cache: 29 copy_process+0xf38/0x10e3
      files_cache: 30 alloc_files+0x1b/0xcf
      signal_cache: 81 copy_process+0xbaa/0x10e3
      sighand_cache: 77 copy_process+0xe65/0x10e3
      sighand_cache: 1 de_thread+0x4d/0x5f8
      anon_vma: 241 anon_vma_prepare+0xd9/0xf3
      size-2048: 1 add_sect_attrs+0x5f/0x145
      size-2048: 2 journal_init_revoke+0x99/0x302
      size-2048: 2 journal_init_revoke+0x137/0x302
      size-2048: 2 journal_init_inode+0xf9/0x1c4
      
      Cc: Manfred Spraul <manfred@colorfullife.com>
      Cc: Alexander Nyberg <alexn@telia.com>
      Cc: Pekka Enberg <penberg@cs.helsinki.fi>
      Cc: Christoph Lameter <clameter@engr.sgi.com>
      Cc: Ravikiran Thirumalai <kiran@scalex86.org>
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      DESC
      slab-leaks3-locking-fix
      EDESC
      From: Andrew Morton <akpm@osdl.org>
      
      Update for slab-remove-cachep-spinlock.patch
      
      Cc: Al Viro <viro@ftp.linux.org.uk>
      Cc: Manfred Spraul <manfred@colorfullife.com>
      Cc: Alexander Nyberg <alexn@telia.com>
      Cc: Pekka Enberg <penberg@cs.helsinki.fi>
      Cc: Christoph Lameter <clameter@engr.sgi.com>
      Cc: Ravikiran Thirumalai <kiran@scalex86.org>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      871751e2
  12. 23 3月, 2006 1 次提交
  13. 04 2月, 2006 1 次提交
  14. 15 1月, 2006 1 次提交
  15. 09 1月, 2006 1 次提交
    • M
      [PATCH] slob: introduce the SLOB allocator · 10cef602
      Matt Mackall 提交于
      configurable replacement for slab allocator
      
      This adds a CONFIG_SLAB option under CONFIG_EMBEDDED.  When CONFIG_SLAB is
      disabled, the kernel falls back to using the 'SLOB' allocator.
      
      SLOB is a traditional K&R/UNIX allocator with a SLAB emulation layer,
      similar to the original Linux kmalloc allocator that SLAB replaced.  It's
      signicantly smaller code and is more memory efficient.  But like all
      similar allocators, it scales poorly and suffers from fragmentation more
      than SLAB, so it's only appropriate for small systems.
      
      It's been tested extensively in the Linux-tiny tree.  I've also
      stress-tested it with make -j 8 compiles on a 3G SMP+PREEMPT box (not
      recommended).
      
      Here's a comparison for otherwise identical builds, showing SLOB saving
      nearly half a megabyte of RAM:
      
      $ size vmlinux*
         text    data     bss     dec     hex filename
      3336372  529360  190812 4056544  3de5e0 vmlinux-slab
      3323208  527948  190684 4041840  3dac70 vmlinux-slob
      
      $ size mm/{slab,slob}.o
         text    data     bss     dec     hex filename
        13221     752      48   14021    36c5 mm/slab.o
         1896      52       8    1956     7a4 mm/slob.o
      
      /proc/meminfo:
                        SLAB          SLOB      delta
      MemTotal:        27964 kB      27980 kB     +16 kB
      MemFree:         24596 kB      25092 kB    +496 kB
      Buffers:            36 kB         36 kB       0 kB
      Cached:           1188 kB       1188 kB       0 kB
      SwapCached:          0 kB          0 kB       0 kB
      Active:            608 kB        600 kB      -8 kB
      Inactive:          808 kB        812 kB      +4 kB
      HighTotal:           0 kB          0 kB       0 kB
      HighFree:            0 kB          0 kB       0 kB
      LowTotal:        27964 kB      27980 kB     +16 kB
      LowFree:         24596 kB      25092 kB    +496 kB
      SwapTotal:           0 kB          0 kB       0 kB
      SwapFree:            0 kB          0 kB       0 kB
      Dirty:               4 kB         12 kB      +8 kB
      Writeback:           0 kB          0 kB       0 kB
      Mapped:            560 kB        556 kB      -4 kB
      Slab:             1756 kB          0 kB   -1756 kB
      CommitLimit:     13980 kB      13988 kB      +8 kB
      Committed_AS:     4208 kB       4208 kB       0 kB
      PageTables:         28 kB         28 kB       0 kB
      VmallocTotal:  1007312 kB    1007312 kB       0 kB
      VmallocUsed:        48 kB         48 kB       0 kB
      VmallocChunk:  1007264 kB    1007264 kB       0 kB
      
      (this work has been sponsored in part by CELF)
      
      From: Ingo Molnar <mingo@elte.hu>
      
         Fix 32-bitness bugs in mm/slob.c.
      Signed-off-by: NMatt Mackall <mpm@selenic.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      10cef602
  16. 26 9月, 2005 1 次提交
    • P
      powerpc: Merge enough to start building in arch/powerpc. · 14cf11af
      Paul Mackerras 提交于
      This creates the directory structure under arch/powerpc and a bunch
      of Kconfig files.  It does a first-cut merge of arch/powerpc/mm,
      arch/powerpc/lib and arch/powerpc/platforms/powermac.  This is enough
      to build a 32-bit powermac kernel with ARCH=powerpc.
      
      For now we are getting some unmerged files from arch/ppc/kernel and
      arch/ppc/syslib, or arch/ppc64/kernel.  This makes some minor changes
      to files in those directories and files outside arch/powerpc.
      
      The boot directory is still not merged.  That's going to be interesting.
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      14cf11af
  17. 26 6月, 2005 1 次提交
    • V
      [PATCH] kdump: Access dump file in elf format (/proc/vmcore) · 666bfddb
      Vivek Goyal 提交于
      From: "Vivek Goyal" <vgoyal@in.ibm.com>
      
      o Support for /proc/vmcore interface. This interface exports elf core image
        either in ELF32 or ELF64 format, depending on the format in which elf headers
        have been stored by crashed kernel.
      o Added support for CONFIG_VMCORE config option.
      o Removed the dependency on /proc/kcore.
      
      From: "Eric W. Biederman" <ebiederm@xmission.com>
      
      This patch has been refactored to more closely match the prevailing style in
      the affected files.  And to clearly indicate the dependency between
      /proc/kcore and proc/vmcore.c
      
      From: Hariprasad Nellitheertha <hari@in.ibm.com>
      
      This patch contains the code that provides an ELF format interface to the
      previous kernel's memory post kexec reboot.
      
      Signed off by Hariprasad Nellitheertha <hari@in.ibm.com>
      Signed-off-by: NEric Biederman <ebiederm@xmission.com>
      Signed-off-by: NVivek Goyal <vgoyal@in.ibm.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      666bfddb
  18. 24 6月, 2005 1 次提交
  19. 22 6月, 2005 1 次提交
  20. 17 4月, 2005 2 次提交
    • M
      [PATCH] meminfo: add Cached underflow check · 4c4c402d
      Martin Hicks 提交于
      Working on some code lately I've been getting huge values for "Cached".
      The cause is that get_page_cache_size() is an approximate value, and for a
      sufficiently small returned value of get_page_cache_size() the value
      underflows.
      Signed-off-by: NMartin Hicks <mort@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      4c4c402d
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4