init survives stray signals; commands are 4-34x faster
Two bugs reported from actual use, plus a test harness that had stopped testing. init could be killed by Ctrl-C, taking the machine with it. SIGINT goes to the foreground process group, init is pgid 1, and any window where tty_fg_pgrp is 1 -- before a shell claims the terminal, after one exits, or between the two while the key is held -- lands it on init. init has no handler, so killed was set, exit() ran, and exit() panics outright on initproc. Spamming Ctrl-C at a frozen program is exactly the input that finds that window. POSIX and Linux both discard a default-action signal for pid 1; init_ignores() now does the same, SIGKILL included, because init is not killable from userspace on any Unix. Everything was slow because BSIZE was 1024 while a SchFS block is 4096, so every block cost four IDE requests, each with its own interrupt and sleep/wakeup. exec() of the 800 KB toybox binary meant ~800 round trips. The giveaway: `seq 1 200`, which touches no file and prints nothing, cost the same 2.0s as `cat /bin/toybox`, and `ls | wc -l` cost exactly double -- both dominated by loading the same binary twice. BSIZE is 4096 now, one request per SchFS block, and NBUF is 256 blocks (1 MB) rather than 90 KB -- smaller than the binary every command execs, so nothing was ever still resident. ideinit() issues SET MULTIPLE MODE, which is what makes a 4096-byte transfer legal: READ/WRITE MULTIPLE move the drive's multiple count per interrupt and nothing had ever set it, which is the real reason idestart() carried a sector_per_block > 7 panic. seq 1 200 2.02s -> 0.06s ls /bin 2.76s -> 0.68s ls /bin | wc -l 4.68s -> 0.73s And the harness. bootcheck called Find-Qemu from a param() default, which is bound before any function in the body exists -- so it died on its first line and printed an error containing neither "FAIL" nor "Exception", the two things being grepped for. It had not run since it was made host-portable. Worse, an earlier index-based edit had deleted the Expect blocks for -Tty, -Usb, -Sock, -Ps and -Evdev, so five of the seven modes asserted nothing at all. Restored, and the USB run gets its own 16 MB build/usbstick.img: it had been pointed at build/fs.img, which nothing builds since SchFS became root, so QEMU refused to start. 242 checks across seven modes, all passing, and make schfs-check green.
This commit is contained in:
Nexoniarz
parent
66340e720e
commit
686d5cf006
13 changed files with 220 additions and 13 deletions
21
Makefile
21
Makefile
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@ -711,6 +711,27 @@ $(BUILD)/sysroot.stamp: sysroot-install
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@cmp -s $@.new $@ || mv -f $@.new $@
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@rm -f $@.new
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# A small block device for the USB test to read.
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#
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# bootcheck -Usb attaches this as a usb-storage device and has the driver read
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# block 1 off it, which is the only check that separates "a device answered
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# INQUIRY" from "the driver can actually transfer data".
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#
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# Its own image, not the root volume and not build/fs.img:
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# - attaching the root volume twice (once as hdb, once over USB) broke the
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# xHCI interrupt check as well as the storage ones;
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# - build/fs.img is no longer built by anything, since SchFS became the root,
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# so pointing at it meant QEMU refused to start at all;
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# - at FSSIZE blocks it would now be ~600 MB, because BSIZE went from 1024 to
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# 4096. 16 MB is plenty to read one block from.
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USBSTICK = $(BUILD)/usbstick.img
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$(USBSTICK): $(MKFS) $(BUILD)/sysroot.stamp
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@mkdir -p $(BUILD)
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@rm -f $@
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$(MKFS) $@ --size 4096 --sysroot $(SYSROOT)
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usbstick: $(USBSTICK)
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$(BUILD)/fs.img: $(MKFS) $(BUILD)/sysroot.stamp
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@mkdir -p $(BUILD)
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@echo "Creating SchOS File System Image..."
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13
include/fs.h
13
include/fs.h
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@ -13,7 +13,18 @@
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#define FS_H
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#define ROOTINO 1 // root i-number
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#define BSIZE 1024 // block size
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// Buffer-cache block size. Matches SCHFS_BLKSIZE deliberately.
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//
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// This was 1024, inherited from xv6, while a SchFS block is 4096 -- so every
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// SchFS block cost *four* bread() calls, and each bread() is one IDE request
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// with its own interrupt, sleep and wakeup. Loading the 800 KB toybox binary
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// meant ~800 round-trips, which is why every command took about two seconds:
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// `seq 1 200`, which touches no file and prints nothing, cost the same 2.0s as
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// `cat /bin/toybox`, because both are dominated by exec() reading the same
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// binary. `ls | wc -l` cost exactly double, loading it twice.
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//
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// At 4096 a SchFS block is one request. Keep the two equal.
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#define BSIZE 4096 // block size
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// Permission mode bits (rwmode field)
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#define RW 3 // 11 read+write
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@ -24,5 +24,16 @@
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#define MAXPATH 128 // max path
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#define MAXOPBLOCKS 30 // max # of blocks any FS op writes
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#define LOGSIZE (MAXOPBLOCKS*3) // max data blocks in on-disk log
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#define NBUF (MAXOPBLOCKS*3) // size of disk block cache
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// Disk block cache, in blocks. 256 * BSIZE = 1 MB.
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//
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// Was MAXOPBLOCKS*3 = 90 blocks, and at the old 1 KB BSIZE that is a 90 KB
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// cache -- smaller than the toybox binary that every single command execs. So
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// nothing was ever still resident on the next command and each one paid the
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// full read again. 1 MB holds toybox with room to spare, which is what makes
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// the *second* command fast rather than just the first.
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//
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// Sized rather than maximised: these are statically allocated in bio.c, so
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// this is memory the system always spends. 1 MB is affordable on a machine
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// with tens of megabytes; 8 MB would not be.
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#define NBUF 256
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#define FSSIZE 150000 // size of file system in blocks
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@ -23,6 +23,7 @@
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#define IDE_CMD_READ 0x20
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#define IDE_CMD_WRITE 0x30
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#define IDE_CMD_RDMUL 0xc4
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#define IDE_CMD_SETMULT 0xc6
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#define IDE_CMD_WRMUL 0xc5
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// idequeue points to the buf now being read/written to the disk.
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@ -69,6 +70,28 @@ ide_irq(void *arg)
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ideintr();
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}
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// SET MULTIPLE MODE: how many sectors the drive moves per interrupt during
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// READ/WRITE MULTIPLE. Must equal BSIZE/SECTOR_SIZE or idestart()'s single
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// insl/outsl of a whole block does not line up with the drive's bursts.
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//
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// A drive may refuse a count it cannot do (IDENTIFY word 47 carries its
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// maximum; QEMU allows 16). If it does, say so rather than continue: the
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// transfers would silently desynchronise, which reads as filesystem
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// corruption rather than as a driver problem.
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static void
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ide_set_multiple(int dev)
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{
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int spb = BSIZE / SECTOR_SIZE;
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outb(0x1f6, 0xe0 | ((dev & 1) << 4));
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if(idewait(0) < 0)
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return;
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outb(0x1f2, spb);
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outb(0x1f7, IDE_CMD_SETMULT);
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if(idewait(1) < 0)
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cprintf("ide%d: SET MULTIPLE MODE %d rejected; expect trouble\n", dev, spb);
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}
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void
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ideinit(void)
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{
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@ -95,6 +118,23 @@ ideinit(void)
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}
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}
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// Tell each drive how many sectors to move per interrupt.
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//
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// READ/WRITE MULTIPLE transfer the drive's *multiple count* of sectors
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// between interrupts, and that count is whatever SET MULTIPLE MODE last
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// established -- it is not taken from the sector-count register. Nothing
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// ever issued it here, so the count was undefined, which is the real reason
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// idestart() carried a `sector_per_block > 7` panic: BSIZE was 1024, two
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// sectors, and nobody had tested further.
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//
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// Establishing it explicitly is what lets BSIZE be a whole SchFS block. At
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// 1024 every 4096-byte SchFS block cost four IDE requests, each with its own
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// interrupt and sleep/wakeup, and exec() of the 800 KB toybox binary meant
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// ~800 round trips -- about two seconds, on every command.
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ide_set_multiple(0);
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if(havedisk1)
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ide_set_multiple(1);
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// Switch back to disk 0.
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outb(0x1f6, 0xe0 | (0<<4));
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}
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@ -121,7 +161,10 @@ idestart(struct buf *b)
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int read_cmd = (sector_per_block == 1) ? IDE_CMD_READ : IDE_CMD_RDMUL;
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int write_cmd = (sector_per_block == 1) ? IDE_CMD_WRITE : IDE_CMD_WRMUL;
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if (sector_per_block > 7) panic("idestart");
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// No `sector_per_block > 7` panic here any more. That limit existed because
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// nothing had set the drive's multiple count, so anything past the tested
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// two sectors was a guess; ideinit() issues SET MULTIPLE MODE now, and the
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// count is whatever BSIZE says.
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idewait(0);
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outb(0x3f6, 0); // generate interrupt
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@ -551,6 +551,26 @@ wakeup(void *chan)
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// mksh depends on kill(getpid(), SIGCHLD) genuinely re-raising SIGCHLD
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// (its held_sigchld recovery in j_startjob); the previous sys_kill
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// silently discarded every non-fatal signal.
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// PID 1 does not die from a signal it never asked to handle.
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//
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// POSIX, and Linux in sig_task_ignored(): a signal whose disposition is the
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// default action is discarded for init rather than delivered. Without this the
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// system has a single keystroke that kills it -- Ctrl-C sends SIGINT to the
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// foreground process group, init is pgid 1, and any moment where tty_fg_pgrp
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// is 1 (before a shell claims the terminal, after one exits, or in the window
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// between the two while the key is held down) lands SIGINT on init. init has
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// no handler, so killed is set, exit() runs, and exit() panics outright on
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// initproc: "init exiting". Spamming Ctrl-C at a frozen program is exactly the
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// input that finds that window.
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//
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// Applies to SIGKILL too, which is the point: init is not killable from
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// userspace on any Unix. A handler it did install is still delivered.
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static int
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init_ignores(struct proc *p, int sig)
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{
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return p == initproc && p->sig_handler[sig] == 0;
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}
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int
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sigsend(int pid, int sig)
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{
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@ -562,6 +582,10 @@ sigsend(int pid, int sig)
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acquire(&ptable.lock);
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for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
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if(p->pid == pid && p->state != UNUSED && p->state != ZOMBIE){
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if(init_ignores(p, sig)){
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release(&ptable.lock);
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return 0; // silently dropped, as POSIX requires
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}
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p->pending_signals |= 1ULL << sig;
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if(p->sig_handler[sig] == 0 &&
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(sig == SIGKILL || sig == SIGTERM || sig == SIGABRT ||
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@ -607,6 +631,8 @@ sigsend_pgrp(int pgid, int sig)
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found = 1;
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if(sig == 0)
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continue; // signal 0 is an existence probe only
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if(init_ignores(p, sig))
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continue; // see init_ignores(): this is the Ctrl-C case
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p->pending_signals |= 1ULL << sig;
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if(p->sig_handler[sig] == 0 &&
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(sig == SIGKILL || sig == SIGTERM || sig == SIGABRT ||
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@ -49,7 +49,7 @@ param(
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# else in this suite touches.
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[switch]$Ps,
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[int]$BootSeconds = 20,
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[string]$Qemu = (Find-Qemu)
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[string]$Qemu
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)
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# QEMU, on whichever host this is.
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@ -75,6 +75,8 @@ function Find-Qemu {
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throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
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}
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if (-not $Qemu) { $Qemu = Find-Qemu }
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$ErrorActionPreference = 'Stop'
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# Repo root is two levels up: this script lives in tools/windows/.
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$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
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@ -132,6 +134,22 @@ $commands += 'wc -l /etc/motd'
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# above and fail here.
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$commands += 'cat /proc/schfs'
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# init must survive signals it has no handler for.
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#
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# This is a crash-the-whole-machine bug, not a nicety: Ctrl-C sends SIGINT to
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# the foreground process group, init is pgid 1, and any window where
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# tty_fg_pgrp is 1 lands it on init -- which had no handler, so killed was set,
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# exit() ran, and exit() panics outright on initproc. Spamming Ctrl-C at a
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# frozen program is what finds that window.
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#
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# SIGKILL is in here deliberately: init is not killable from userspace on any
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# Unix, and a guard that covers SIGINT but not SIGKILL is half a fix.
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$commands += 'kill -INT 1'
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$commands += 'kill -KILL 1'
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$commands += 'kill -TERM 1'
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$commands += 'echo INIT-SURVIVED'
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$commands += 'ps | head -3'
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if ($Fb) {
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# /dev/fb0. The geometry has to come back from the mode the bootloader
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# actually programmed -- three places in the kernel used to assume
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@ -213,14 +231,14 @@ $usbDevices = if ($Usb) {
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# the hub sits on port 2 and the mouse on port 2.1 of the same bus.
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'-device usb-hub,id=hub,bus=xhci.0,port=2'
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'-device usb-mouse,bus=xhci.0,port=2.1'
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# Always the v1 image, never $hdb. The checks below read a v1 superblock
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# Its own small image, never $hdb. The checks below read a v1 superblock
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# off this stick and assert on its sector count and size field, so the
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# stick has to be a v1 image whatever the root filesystem is -- under
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# the root $hdb is a SchFS volume and those fields are simply not
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# there, which failed three USB checks that had nothing wrong with USB.
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# It also stops the same file being attached twice, once as the root
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# disk and once as a USB device.
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"-drive id=usbstick,file=`"$(Join-Path $root 'build/fs.img')`",format=raw,if=none"
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"-drive id=usbstick,file=`"$(Join-Path $root 'build/usbstick.img')`",format=raw,if=none"
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'-device usb-storage,bus=xhci.0,drive=usbstick')
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} else { @() }
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@ -419,6 +437,12 @@ Expect '00:01\.1 8086:7010 IDE' 'the IDE controller was identified by class'
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Expect '\[vga\]' 'a driver bound itself to the display controller'
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Expect 'vga: display controller' 'the display driver found its aperture'
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# If init had died the machine would have panicked and nothing below this
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# point would appear at all -- but check explicitly, so a failure names the
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# cause instead of showing up as "the shell stopped answering".
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Expect 'INIT-SURVIVED' 'init survives SIGINT, SIGKILL and SIGTERM'
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Expect '(?m)^\s*1\s' 'pid 1 is still in the process table afterwards'
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Expect 'schfs: mounted' 'the kernel mounted SchFS as the root filesystem'
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Expect 'init: ready' 'init came up on a SchFS root'
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Expect 'label:\s*schos' '/proc/schfs reports the volume label'
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@ -457,5 +481,62 @@ if ($Fb) {
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Expect 'gradient drawn' 'mmap of /dev/fb0 maps the real framebuffer'
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}
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if ($Tty) {
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# Each of these is a bug that once looked like a broken *command*.
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# `ls | wc -l` reported 48 rather than the real count because ioctl
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# answered TIOCGWINSZ on a pipe with success, so ls formatted in columns.
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# Anything in the hundreds means it printed one name per line.
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Expect '(?m)^\s*[2-9][0-9]{2}\s*$' 'ls into a pipe prints one name per line'
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# writev capped iovcnt at 16; toybox builds 256 of them, so `yes` failed
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# outright.
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Expect '(?ms)yes \| head -2\s*\n\s*y\s*\n\s*y' 'yes writes through a pipe'
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# 0x7F E L F. Four bytes, not three -- the leading byte is invisible.
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Expect 'ELF' 'a binary reads back through a pipe intact'
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Expect 'caf.*-.*-' 'UTF-8 survives the terminal unmangled'
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# SIG_IGN is handler value 1, and signal delivery once jumped to address 1,
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# which killed the shell rather than the pipeline.
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Expect 'TTY-SURVIVED' 'the shell is still alive after all of that'
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Expect 'shmtest: all checks passed' 'shared memory and file-backed mmap work'
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}
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if ($Usb) {
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# A registered handler that never fires looks exactly like a working one
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# from userspace. A non-zero count on the xhci line is the difference.
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# Not anchored to the start of the line: xHCI shares IRQ 11 with the e1000
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# here, so the line reads "11: 28 e1000, 28 xhci level" and the xhci
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# entry is the second one on it.
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Expect '[1-9]\d*\s+xhci' 'the xHCI interrupt is actually delivered'
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# build/usbstick.img is 16 MB = 32768 sectors of 512 bytes. READ CAPACITY
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# returning the true geometry is what separates a driver that parsed the
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# reply from one that assumed a size.
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Expect 'usb-storage: 32768 sectors of 512 bytes' 'READ CAPACITY returned the true size'
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# And then an actual transfer: block 1 of a v1 image is its superblock.
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Expect 'block 1 magic 10203040' 'a real block came back off the USB disk'
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Expect 'size 4096' 'the superblock read over USB is the right one'
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}
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if ($Sock) {
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Expect 'socktest: ALL CHECKS PASSED' 'every socket check passed'
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}
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if ($Ps) {
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# /proc is synthetic, so a per-process directory is the thing to prove.
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# `ls /proc` prints in columns, so pid 1 is a token on a line rather than a
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# line of its own.
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Expect '(?m)^1\s+\d' '/proc has a directory for pid 1'
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Expect '(?m)^1 \(' '/proc/1/stat starts with the pid and comm'
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Expect 'sinit|init' 'ps names pid 1'
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Expect '(?m)PID.*PPID.*COMM' 'ps honours -o with the requested columns'
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Expect 'load average|Mem|CPU' 'top produces a report rather than an error'
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}
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if ($Evdev) {
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# A key has to be *pressed* for this to say anything: characters typed at
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# the serial port never reach the keyboard controller, which is why this
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# run drives the QEMU monitor's sendkey instead.
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Expect 'inputtest: done|event limit reached' 'the input layer delivered events'
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Expect 'value' 'events carry a value, not just a type'
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}
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if ($script:fail) { exit 1 }
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Write-Host 'boot check passed' -ForegroundColor Green
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|
|
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@ -14,7 +14,7 @@
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param(
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[int]$BootSeconds = 20,
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[string]$Out = "build/crashscreen.ppm",
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[string]$Qemu = (Find-Qemu)
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[string]$Qemu
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)
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# QEMU, on whichever host this is.
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|
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@ -40,6 +40,8 @@ function Find-Qemu {
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throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
|
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}
|
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|
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if (-not $Qemu) { $Qemu = Find-Qemu }
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|
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$ErrorActionPreference = 'Stop'
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# Repo root is two levels up: this script lives in tools/windows/.
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$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
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||||
|
|
|
|||
|
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@ -19,7 +19,7 @@
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|||
param(
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[int]$BootSeconds = 20,
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[string]$Out = "build/dispshot.ppm",
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[string]$Qemu = (Find-Qemu)
|
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[string]$Qemu
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)
|
||||
|
||||
# QEMU, on whichever host this is.
|
||||
|
|
@ -45,6 +45,8 @@ function Find-Qemu {
|
|||
throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
|
||||
}
|
||||
|
||||
if (-not $Qemu) { $Qemu = Find-Qemu }
|
||||
|
||||
$ErrorActionPreference = 'Stop'
|
||||
# Repo root is two levels up: this script lives in tools/windows/.
|
||||
$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
|
||||
|
|
|
|||
|
|
@ -13,7 +13,7 @@ param(
|
|||
[ValidateSet('fill', 'bars')]
|
||||
[string]$Mode = 'fill',
|
||||
[int]$BootSeconds = 20,
|
||||
[string]$Qemu = (Find-Qemu)
|
||||
[string]$Qemu
|
||||
)
|
||||
|
||||
# QEMU, on whichever host this is.
|
||||
|
|
@ -39,6 +39,8 @@ function Find-Qemu {
|
|||
throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
|
||||
}
|
||||
|
||||
if (-not $Qemu) { $Qemu = Find-Qemu }
|
||||
|
||||
$ErrorActionPreference = 'Stop'
|
||||
# Repo root is two levels up: this script lives in tools/windows/.
|
||||
$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
|
||||
|
|
|
|||
|
|
@ -14,7 +14,7 @@
|
|||
param(
|
||||
[switch]$Run,
|
||||
[switch]$Clean,
|
||||
[string]$Qemu = (Find-Qemu)
|
||||
[string]$Qemu
|
||||
)
|
||||
|
||||
# QEMU, on whichever host this is.
|
||||
|
|
@ -40,6 +40,8 @@ function Find-Qemu {
|
|||
throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
|
||||
}
|
||||
|
||||
if (-not $Qemu) { $Qemu = Find-Qemu }
|
||||
|
||||
$ErrorActionPreference = 'Stop'
|
||||
# Repo root is two levels up: this script lives in tools/windows/.
|
||||
$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
|
||||
|
|
|
|||
|
|
@ -17,7 +17,7 @@ param(
|
|||
[int]$Every = 400, # milliseconds between frames
|
||||
[int]$For = 8, # seconds to keep capturing
|
||||
[string]$OutDir = "build/shots",
|
||||
[string]$Qemu = (Find-Qemu)
|
||||
[string]$Qemu
|
||||
)
|
||||
|
||||
# QEMU, on whichever host this is.
|
||||
|
|
@ -43,6 +43,8 @@ function Find-Qemu {
|
|||
throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
|
||||
}
|
||||
|
||||
if (-not $Qemu) { $Qemu = Find-Qemu }
|
||||
|
||||
$ErrorActionPreference = 'Stop'
|
||||
# Repo root is two levels up: this script lives in tools/windows/.
|
||||
$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
|
||||
|
|
|
|||
|
|
@ -19,7 +19,7 @@
|
|||
param(
|
||||
[int]$BootSeconds = 20,
|
||||
[string]$Out = "build/textshot.ppm",
|
||||
[string]$Qemu = (Find-Qemu)
|
||||
[string]$Qemu
|
||||
)
|
||||
|
||||
# QEMU, on whichever host this is.
|
||||
|
|
@ -45,6 +45,8 @@ function Find-Qemu {
|
|||
throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
|
||||
}
|
||||
|
||||
if (-not $Qemu) { $Qemu = Find-Qemu }
|
||||
|
||||
$ErrorActionPreference = 'Stop'
|
||||
# Repo root is two levels up: this script lives in tools/windows/.
|
||||
$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
|
||||
|
|
|
|||
|
|
@ -12,7 +12,7 @@
|
|||
param(
|
||||
[int]$BootSeconds = 22,
|
||||
[string]$Out = "build/ttyshot.ppm",
|
||||
[string]$Qemu = (Find-Qemu)
|
||||
[string]$Qemu
|
||||
)
|
||||
|
||||
# QEMU, on whichever host this is.
|
||||
|
|
@ -38,6 +38,8 @@ function Find-Qemu {
|
|||
throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
|
||||
}
|
||||
|
||||
if (-not $Qemu) { $Qemu = Find-Qemu }
|
||||
|
||||
$ErrorActionPreference = 'Stop'
|
||||
# Repo root is two levels up: this script lives in tools/windows/.
|
||||
$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
|
||||
|
|
|
|||
Loading…
Reference in a new issue