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Mateusz Guzik 4093e719b4 amd64 pmap: batch chunk removal in pmap_remove_pages 
pv list lock is the main bottleneck during poudriere -j 104 and
pmap_remove_pages is the most impactful consumer. It frees chunks with the lock
held even though it plays no role in correctness. Moreover chunks are often
freed in groups, sample counts during buildkernel (0-sized frees removed):

    value  ------------- Distribution ------------- count
          0 |                                         0
          1 |                                         8
          2 |@@@@@@@                                  19329
          4 |@@@@@@@@@@@@@@@@@@@@@@                   58517
          8 |                                         1085
         16 |                                         71
         32 |@@@@@@@@@@                               24919
         64 |                                         899
        128 |                                         7
        256 |                                         2
        512 |                                         0

Thus:
1. batch freeing
2. move it past unlocking pv list

Reviewed by:	alc (previous version), markj (previous version), kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21832
2019-09-29 20:44:13 +00:00
..
acpica Merge ACPICA 20190329. 2019-03-29 20:21:28 +00:00
amd64 amd64 pmap: batch chunk removal in pmap_remove_pages 2019-09-29 20:44:13 +00:00
cloudabi32 Remove sv_pagesize, originally introduced with r100384. 2019-03-01 16:16:38 +00:00
cloudabi64 Remove sv_pagesize, originally introduced with r100384. 2019-03-01 16:16:38 +00:00
conf Start to split out the really x86 specific NOTES from the global notes file. 2019-08-12 22:58:13 +00:00
ia32 Don't pass error from syscallenter() to syscallret(). 2019-07-15 21:25:16 +00:00
include Revert r352406, which contained changes I didn't intend to commit. 2019-09-16 15:04:45 +00:00
linux sysent: regenerate after r352693 2019-09-25 17:30:28 +00:00
linux32 sysent: regenerate after r352693 2019-09-25 17:30:28 +00:00
pci pci_cfgreg.c: Use io port config access for early boot time. 2019-04-09 18:07:17 +00:00
sgx Change synchonization rules for vm_page reference counting. 2019-09-09 21:32:42 +00:00
vmm Correct the scope of several global variables. 2019-09-27 21:04:33 +00:00
Makefile Bring the tags and links entries for amd64 up to date. 2015-10-27 22:59:24 +00:00