git: kernel - syscall path optimizations

[Matthew Dillon]

commit 25dd4bb7f661ca3c242164001c613c3db9553a46
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Mon Mar 2 20:42:22 2020 -0800

    kernel - syscall path optimizations
    
    * Shortcut checks in dfly_acquire_curproc(), significantly reducing
      system call overhead.
    
    * Move one of the TDF_MP_BATCH_DEMARC test out of dfly_acquire_curproc()
      and into the scheduler clock.
    
    * Add appropriate __predict*() macros to various conditionals in the
      system call path and convert the terminal switch() for syscall to
      a sequence of if()'s.
    
    * Remove SYF_ARGMASK.

Summary of changes:
 sys/cpu/x86_64/include/cpu.h         |  5 +++++
 sys/kern/usched_dfly.c               | 30 +++++++++++++++++++-----------
 sys/platform/pc64/x86_64/trap.c      | 30 +++++++++++++++---------------
 sys/platform/vkernel64/x86_64/trap.c |  2 +-
 sys/sys/sysent.h                     |  2 --
 sys/sys/usched.h                     |  1 +
 6 files changed, 41 insertions(+), 29 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/25dd4bb7f661ca3c242164001c613c3db9553a46


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