1. 09 10月, 2006 6 次提交
  2. 08 10月, 2006 4 次提交
  3. 07 10月, 2006 8 次提交
  4. 06 10月, 2006 15 次提交
  5. 05 10月, 2006 7 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
    • D
      IRQ: Typedef the IRQ handler function type · da482792
      David Howells 提交于
      Typedef the IRQ handler function type.
      Signed-Off-By: NDavid Howells <dhowells@redhat.com>
      (cherry picked from 1356d1e5fd256997e3d3dce0777ab787d0515c7a commit)
      da482792
    • D
      IRQ: Typedef the IRQ flow handler function type · 57a58a94
      David Howells 提交于
      Typedef the IRQ flow handler function type.
      Signed-Off-By: NDavid Howells <dhowells@redhat.com>
      (cherry picked from 8e973fbdf5716b93a0a8c0365be33a31ca0fa351 commit)
      57a58a94
    • A
      [POWERPC] spufs: add infrastructure for finding elf objects · 86767277
      Arnd Bergmann 提交于
      This adds an 'object-id' file that the spe library can
      use to store a pointer to its ELF object. This was
      originally meant for use by oprofile, but is now
      also used by the GNU debugger, if available.
      
      In order for oprofile to find the location in an spu-elf
      binary where an event counter triggered, we need a way
      to identify the binary in the first place.
      
      Unfortunately, that binary itself can be embedded in a
      powerpc ELF binary. Since we can assume it is mapped into
      the effective address space of the running process,
      have that one write the pointer value into a new spufs
      file.
      
      When a context switch occurs, pass the user value to
      the profiler so that can look at the mapped file (with
      some care).
      Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      86767277
    • A
      [POWERPC] spufs: Add infrastructure needed for gang scheduling · 6263203e
      Arnd Bergmann 提交于
      Add the concept of a gang to spufs as a new type of object.
      So far, this has no impact whatsover on scheduling, but makes
      it possible to add that later.
      
      A new type of object in spufs is now a spu_gang. It is created
      with the spu_create system call with the flags argument set
      to SPU_CREATE_GANG (0x2). Inside of a spu_gang, it
      is then possible to create spu_context objects, which until
      now was only possible at the root of spufs.
      
      There is a new member in struct spu_context pointing to
      the spu_gang it belongs to, if any. The spu_gang maintains
      a list of spu_context structures that are its children.
      This information can then be used in the scheduler in the
      future.
      
      There is still a bug that needs to be resolved in this
      basic infrastructure regarding the order in which objects
      are removed. When the spu_gang file descriptor is closed
      before the spu_context descriptors, we leak the dentry
      and inode for the gang. Any ideas how to cleanly solve
      this are appreciated.
      Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      6263203e
    • A
      [POWERPC] spufs: implement error event delivery to user space · 9add11da
      Arnd Bergmann 提交于
      This tries to fix spufs so we have an interface closer to what is
      specified in the man page for events returned in the third argument of
      spu_run.
      
      Fortunately, libspe has never been using the returned contents of that
      register, as they were the same as the return code of spu_run (duh!).
      
      Unlike the specification that we never implemented correctly, we now
      require a SPU_CREATE_EVENTS_ENABLED flag passed to spu_create, in
      order to get the new behavior. When this flag is not passed, spu_run
      will simply ignore the third argument now.
      Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      9add11da
    • M
      [POWERPC] spufs: scheduler support for NUMA. · a68cf983
      Mark Nutter 提交于
      This patch adds NUMA support to the the spufs scheduler.
      
      The new arch/powerpc/platforms/cell/spufs/sched.c is greatly
      simplified, in an attempt to reduce complexity while adding
      support for NUMA scheduler domains.  SPUs are allocated starting
      from the calling thread's node, moving to others as supported by
      current->cpus_allowed.  Preemption is gone as it was buggy, but
      should be re-enabled in another patch when stable.
      
      The new arch/powerpc/platforms/cell/spu_base.c maintains idle
      lists on a per-node basis, and allows caller to specify which
      node(s) an SPU should be allocated from, while passing -1 tells
      spu_alloc() that any node is allowed.
      
      Since the patch removes the currently implemented preemptive
      scheduling, it is technically a regression, but practically
      all users have since migrated to this version, as it is
      part of the IBM SDK and the yellowdog distribution, so there
      is not much point holding it back while the new preemptive
      scheduling patch gets delayed further.
      Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      a68cf983
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