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Add raw memory visualization tool to redbean

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This change introduces a `-W /dev/pts/1` flag to redbean. What it does
is use the mincore() system call to create a dual-screen terminal
display that lets you troubleshoot the virtual address space. This is
useful since page faults are an important thing to consider when using a
forking web server. Now we have a colorful visualization of which pages
are going to fault and which ones are resident in memory.

The memory monitor, if enabled, spawns as a thread that just outputs
ANSI codes to the second terminal in a loop. In order to make this
happen using the new clone() polyfill, stdio is now thread safe.

This change also introduces some new demo pages to redbean. It also
polishes the demos we already have, to look a bit nicer and more
presentable for the upcoming release, with better explanations too.
This commit is contained in:
Justine Tunney 2022-05-14 04:33:58 -07:00
parent 578cb21591
commit 80b211e314
106 changed files with 1483 additions and 592 deletions
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2
libc/sysv/calls/mincore.s
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@ -1,2 +0,0 @@
.include "o/libc/sysv/macros.internal.inc"
.scall mincore,0x04e04e04e204e01b,globl

2
libc/sysv/calls/sys_mincore.s Normal file
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@ -0,0 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_mincore,0x04e04e04e204e01b,globl,hidden

2
libc/sysv/syscalls.sh
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@ -62,7 +62,7 @@ scall pselect 0x1b406e20a218afff globl
scall pselect6 0xfffffffffffff10e globl
scall sys_sched_yield 0x15e12a14b103c018 globl hidden # swtch() on xnu
scall __sys_mremap 0x19bffffffffff019 globl hidden
scall mincore 0x04e04e04e204e01b globl
scall sys_mincore 0x04e04e04e204e01b globl hidden
scall sys_madvise 0x04b04b04b204b01c globl hidden
scall shmget 0x0e71210e7210901d globl # consider mmap
scall shmat 0x0e40e40e4210601e globl # consider mmap