Belated out of swap kill on rpi3 at r359216

[Mark Millard]

On 2020-Mar-26, at 16:24, Mark Millard <marklmi at yahoo.com> wrote:

> On 2020-Mar-26, at 15:06, bob prohaska <fbsd at www.zefox.net> wrote:
> 
>> . . .
> 
> Anyway, I may, for a time, have one context that is
> more like yours than is normal for me. As stands, the
> RPi3 is doing a from-scratch buildworld buildkernel .
> (Reconstructing the head -r358966 that it is already
> running.) It is not splitting the I/O load but is
> using a USB SSD (via a powered hub), not the microsd
> card. No extra logging. vm.pfault_oom_attempts=-1
> and vm.pageout_oom_seq=120 for this attempt. 3072
> MiBytes of page/swap space. It is a -j4 build attempt.
> 

("No extra logging" meant: beyond my normal typescript
recording of the build output. That file ended up at
7741518 Bytes for size.)


The build completed without any /var/log/message or
console output during the build. My modified version
of top reported (details copied from a ssh window) . . .

For Mem: 738512Ki MaxObsActive, 190608Ki MaxObsWired, 906372Ki MaxObs(Act+Wir)
For Swap:  1927Mi MaxObsUsed

(top was started before the build. "MaxObs" is short
for "Maximum Observed".)

The build took a few minutes under 31 hrs.
(Ending:   2010-03-27:18:54:03
 Starting: 2020-03-26:12:02:47).

Because it was rebuilding -r358966 that it was already
running, no bootstrap compiler or linker was built,
despite it being a from-scratch build: The system
compiler and linker were sufficient.



For reference: the details of what was specified for
building (contributes to "how long it took"). . .

# more ~/src.configs/src.conf.cortexA53-clang-bootstrap.aarch64-host 
TO_TYPE=aarch64
#
KERNCONF=GENERIC-NODBG
TARGET=arm64
.if ${.MAKE.LEVEL} == 0
TARGET_ARCH=${TO_TYPE}
.export TARGET_ARCH
.endif
#
WITH_SYSTEM_COMPILER=
WITH_SYSTEM_LINKER=
#
WITH_LIBCPLUSPLUS=
WITHOUT_BINUTILS_BOOTSTRAP=
WITH_ELFTOOLCHAIN_BOOTSTRAP=
#Disables avoiding bootstrap: WITHOUT_LLVM_TARGET_ALL=
WITH_LLVM_TARGET_AARCH64=
WITH_LLVM_TARGET_ARM=
WITHOUT_LLVM_TARGET_MIPS=
WITHOUT_LLVM_TARGET_POWERPC=
WITHOUT_LLVM_TARGET_RISCV=
WITHOUT_LLVM_TARGET_X86=
WITH_CLANG=
WITH_CLANG_IS_CC=
WITH_CLANG_FULL=
WITH_CLANG_EXTRAS=
WITH_LLD=
WITH_LLD_IS_LD=
WITHOUT_BINUTILS=
WITH_LLDB=
#
WITH_BOOT=
WITHOUT_LIB32=
#
#
NO_WERROR=
#WERROR=
MALLOC_PRODUCTION=
#
# Avoid stripping but do not control host -g status as well:
DEBUG_FLAGS+=
#
WITH_DEBUG_FILES=
#
# Use of the .clang 's here avoids
# interfering with other C<?>FLAGS
# usage, such as ?= usage.
CFLAGS.clang+= -mcpu=cortex-a53
CXXFLAGS.clang+= -mcpu=cortex-a53
CPPFLAGS.clang+= -mcpu=cortex-a53
ACFLAGS.arm64cpuid.S+=  -mcpu=cortex-a53+crypto
ACFLAGS.aesv8-armx.S+=  -mcpu=cortex-a53+crypto
ACFLAGS.ghashv8-armx.S+=        -mcpu=cortex-a53+crypto

# more /usr/src/sys/arm64/conf/GENERIC-NODBG 
#
# GENERIC -- Custom configuration for the arm64/aarch64
#

include "GENERIC"

ident   GENERIC-NODBG

makeoptions     DEBUG=-g                # Build kernel with gdb(1) debug symbols

options         ALT_BREAK_TO_DEBUGGER

options         KDB                     # Enable kernel debugger support

# For minimum debugger support (stable branch) use:
#options        KDB_TRACE               # Print a stack trace for a panic
options         DDB                     # Enable the kernel debugger

# Extra stuff:
#options        VERBOSE_SYSINIT=0       # Enable verbose sysinit messages
#options        BOOTVERBOSE=1
#options        BOOTHOWTO=RB_VERBOSE
#options        KTR
#options        KTR_MASK=KTR_TRAP
##options       KTR_CPUMASK=0xF
#options        KTR_VERBOSE

# Disable any extra checking for. . .
nooptions       DEADLKRES               # Enable the deadlock resolver
nooptions       INVARIANTS              # Enable calls of extra sanity checking
nooptions       INVARIANT_SUPPORT       # Extra sanity checks of internal structures, required by INVARIANTS
nooptions       WITNESS                 # Enable checks to detect deadlocks and cycles
nooptions       WITNESS_SKIPSPIN        # Don't run witness on spinlocks for speed
nooptions       DIAGNOSTIC
nooptions       MALLOC_DEBUG_MAXZONES   # Separate malloc(9) zones
nooptions       BUF_TRACKING
nooptions       FULL_BUF_TRACKING


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)