diff options
| author | Scott Soule Cheloha <cheloha@cvs.openbsd.org> | 2023-06-20 16:30:31 +0000 |
|---|---|---|
| committer | Scott Soule Cheloha <cheloha@cvs.openbsd.org> | 2023-06-20 16:30:31 +0000 |
| commit | 237f5b65791baccc19d9b706a42e06d5b9574cb9 (patch) | |
| tree | c5807d7fe5384765dc1830460fb35a1b08c814ec /share/man/man9 | |
| parent | 2484dfccb69ff5f1e12b2b83bf99a5af729f1d35 (diff) | |
schedcpu, uvm_meter(9): make uvm_meter() an independent timeout
uvm_meter(9) should not base its periodic uvm_loadav() call on the UTC
clock. It also no longer needs to periodically wake up proc0 because
proc0 doesn't do any work. schedcpu() itself may change or go away,
but as kettenis@ notes we probably can't completely remove the concept
of a "load average" from OpenBSD, given its long Unix heritage.
So, (1) remove the uvm_meter() call from schedcpu(), (2) make
uvm_meter() an independent timeout started alongside schedcpu() during
scheduler_start(), and (3) delete the vestigial periodic proc0 wakeup.
With input from deraadt@, kettenis@, and claudio@. deraadt@ cautions
that this change may confuse administrators who hold the load average
in high regard.
Thread: https://marc.info/?l=openbsd-tech&m=168710929409153&w=2
general agreement with this direction from kettenis@
ok claudio@
Diffstat (limited to 'share/man/man9')
| -rw-r--r-- | share/man/man9/uvm_init.9 | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/share/man/man9/uvm_init.9 b/share/man/man9/uvm_init.9 index 2ef1769b091..636a16a13b3 100644 --- a/share/man/man9/uvm_init.9 +++ b/share/man/man9/uvm_init.9 @@ -1,4 +1,4 @@ -.\" $OpenBSD: uvm_init.9,v 1.5 2023/05/21 05:11:38 jmc Exp $ +.\" $OpenBSD: uvm_init.9,v 1.6 2023/06/20 16:30:30 cheloha Exp $ .\" $NetBSD: uvm.9,v 1.14 2000/06/29 06:08:44 mrg Exp $ .\" .\" Copyright (c) 1998 Matthew R. Green @@ -28,7 +28,7 @@ .\" XXX this manual sets nS to 1 or 0 in the description, to obtain .\" synopsis-like function prototypes. any better way? .\" -.Dd $Mdocdate: May 21 2023 $ +.Dd $Mdocdate: June 20 2023 $ .Dt UVM_INIT 9 .Os .Sh NAME @@ -168,7 +168,7 @@ argument is ignored. .Ft void .Fn uvm_kernacc "caddr_t addr" "size_t len" "int rw" .Ft void -.Fn uvm_meter +.Fn uvm_meter "void *" .Ft int .Fn uvm_sysctl "int *name" "u_int namelen" "void *oldp" "size_t *oldlenp" "void *newp " "size_t newlen" "struct proc *p" .Ft int @@ -212,7 +212,7 @@ access, in the kernel address space. .Pp The .Fn uvm_meter -function calculates the load average and wakes up the swapper if necessary. +function periodically recomputes the load average. .Pp The .Fn uvm_sysctl |