git: kernel - Detune memory slab allocator pcpu caching a little

[Matthew Dillon]

commit 0186d1945bd435a81583a01a36eaa4256e364fb1
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Fri Apr 24 10:02:28 2020 -0700

    kernel - Detune memory slab allocator pcpu caching a little
    
    * The kernel tries to cache a lot of slab zones on a pcpu basis
      due to the high overhead of mapping and unmapping kernel memory.
      However, this can burn an excessive amount of physical memory on
      high-core-count cpus.
    
    * Reduce the pcpu cache hysteresis on systems with more than 32 cpu
      threads.  So on a 128-thread TR with 256GB of ram, this reduces
      the slab cache from a ridiculous 30GB to a more reasonable 10GB.

Summary of changes:
 sys/kern/kern_slaballoc.c | 15 ++++++++++++++-
 sys/kern/sys_pipe.c       | 11 +++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/0186d1945bd435a81583a01a36eaa4256e364fb1


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