cvs commit: src/sys/alpha/alpha vm_machdep.c src/sys/amd64/amd64 vm_machdep.c src/sys/i386/i386 vm_machdep.c src/sys/ia64/ia64 vm_machdep.c src/sys/kern uipc_syscalls.c src/sys/powerpc/powerpc vm_machdep.c src/sys/sparc64/sparc64 vm_machdep.c

[Alan Cox]

alc         2003/08/29 13:04:10 PDT

  FreeBSD src repository

  Modified files:
    sys/alpha/alpha      vm_machdep.c 
    sys/amd64/amd64      vm_machdep.c 
    sys/i386/i386        vm_machdep.c 
    sys/ia64/ia64        vm_machdep.c 
    sys/kern             uipc_syscalls.c 
    sys/powerpc/powerpc  vm_machdep.c 
    sys/sparc64/sparc64  vm_machdep.c 
  Log:
  Migrate the sf_buf allocator that is used by sendfile(2) and zero-copy
  sockets into machine-dependent files.  The rationale for this
  migration is illustrated by the modified amd64 allocator.  It uses the
  amd64's direct map to avoid emphemeral mappings in the kernel's
  address space.  On an SMP, the emphemeral mappings result in an IPI
  for TLB shootdown for each transmitted page.  Yuck.
  
  Maintainers of other 64-bit platforms with direct maps should be able
  to use the amd64 allocator as a reference implementation.
  
  Revision  Changes    Path
  1.94      +101 -0    src/sys/alpha/alpha/vm_machdep.c
  1.217     +95 -0     src/sys/amd64/amd64/vm_machdep.c
  1.215     +101 -0    src/sys/i386/i386/vm_machdep.c
  1.70      +101 -0    src/sys/ia64/ia64/vm_machdep.c
  1.156     +0 -99     src/sys/kern/uipc_syscalls.c
  1.91      +101 -0    src/sys/powerpc/powerpc/vm_machdep.c
  1.51      +104 -0    src/sys/sparc64/sparc64/vm_machdep.c