git: kernel - Implement td_limit reflection of p_limit

[Matthew Dillon]

commit 384ee8f01ebd5f89d81412517d1f5aca8bcdaba8
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu Apr 19 17:52:53 2018 -0700

    kernel - Implement td_limit reflection of p_limit
    
    * Reflect proc->p_limit onto thread->td_limit to allow lockless
      rlimits testing.
    
    * Significantly improves performance for rlimits-testing-centric
      operations such as for dup() and dup2().
    
    * Also fixes performance issues across processes when the plimit
      structure is shared across many processes.  In this situation,
      unnecessary locking conflicts developed due to the high level
      of sharing across what would normally be considered distinct
      processes.
    
    Suggested-by: mjg

Summary of changes:
 sys/kern/kern_descrip.c | 47 ++++++++++++++++++++++++++++++++---------------
 sys/kern/kern_exit.c    |  9 ++++++++-
 sys/kern/kern_plimit.c  | 31 +++++++++++++++++++++++++++----
 sys/kern/kern_synch.c   |  2 +-
 sys/sys/resourcevar.h   |  9 +++++----
 sys/sys/thread.h        |  4 ++--
 6 files changed, 75 insertions(+), 27 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/384ee8f01ebd5f89d81412517d1f5aca8bcdaba8


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