git: kernel - Vastly improve zalloc/zfree

[Matthew Dillon]

commit dcdf6bfdd71b8aae241f8a825bb32f3eea86f518
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Fri Dec 19 19:20:33 2025 -0800

    kernel - Vastly improve zalloc/zfree
    
    * Vastly improve zalloc/zfree by shifting items from the zone pool
      to the zone's pcpu pool or back again opportunistically, and in
      smaller chunks.
    
      The opportunistic mechanism uses spin_trylock(), and so does not
      contend at all.  The regular spin_lock() is onl used when the counts
      exceed the opportunistic limits.
    
    * Should improve regular kernel performance under heavy loads.
    
    * Vastly improves vkernel performance under multi-cpu loads due to pvzone
      operation.  However, note that the host still has strong contention on
      the vkp->token that we need to address.

Summary of changes:
 sys/vm/vm_zone.c | 131 ++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 87 insertions(+), 44 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/dcdf6bfdd71b8aae241f8a825bb32f3eea86f518


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