Age | Commit message (Collapse) | Author |
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PiperOrigin-RevId: 272522508
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Right now, we can find more than one process with the 1 PID in /proc.
$ for i in `seq 10`; do
> unshare -fp sleep 1000 &
> done
$ ls /proc
1 1 1 1 12 18 24 29 6 loadavg net sys version
1 1 1 1 16 20 26 32 cpuinfo meminfo self thread-self
1 1 1 1 17 21 28 36 filesystems mounts stat uptime
PiperOrigin-RevId: 272506593
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Kernel.cpuClockTicker increments kernel.cpuClock, which tasks use as a clock to
track their CPU usage. This improves latency in the syscall path by avoid
expensive monotonic clock calls on every syscall entry/exit.
However, this timer fires every 10ms. Thus, when all tasks are idle (i.e.,
blocked or stopped), this forces a sentry wakeup every 10ms, when we may
otherwise be able to sleep until the next app-relevant event. These wakeups
cause the sentry to utilize approximately 2% CPU when the application is
otherwise idle.
Updates to clock are not strictly necessary when the app is idle, as there are
no readers of cpuClock. This commit reduces idle CPU by disabling the timer
when tasks are completely idle, and computing its effects at the next wakeup.
Rather than disabling the timer as soon as the app goes idle, we wait until the
next tick, which provides a window for short sleeps to sleep and wakeup without
doing the (relatively) expensive work of disabling and enabling the timer.
PiperOrigin-RevId: 272265822
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Reported-by: syzbot+bb5ed342be51d39b0cbb@syzkaller.appspotmail.com
PiperOrigin-RevId: 272110815
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The gofer's CachingInodeOperations implementation contains an optimization for
the common open-read-close pattern when we have a host FD. In this case, the
host kernel will update the timestamp for us to a reasonably close time, so we
don't need an extra RPC to the gofer.
However, when the app explicitly sets the timestamps (via futimes or similar)
then we actually DO need to update the timestamps, because the host kernel
won't do it for us.
To fix this, a new boolean `forceSetTimestamps` was added to
CachineInodeOperations.SetMaskedAttributes. It is only set by
gofer.InodeOperations.SetTimestamps.
PiperOrigin-RevId: 272048146
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How to reproduce:
$ echo "timeout 10 ls" > foo.sh
$ chmod +x foo.sh
$ ./foo.sh
(will hang here for 10 secs, and the output of ls does not show)
When "ls" process writes to stdout, it receives SIGTTOU signal, and
hangs there. Until "timeout" process timeouts, and kills "ls" process.
The expected result is: "ls" writes its output into tty, and terminates
immdedately, then "timeout" process receives SIGCHLD and terminates.
The reason for this failure is that we missed the check for TOSTOP (if
set, background processes will receive the SIGTTOU signal when they do
write).
We use drivers/tty/n_tty.c:n_tty_write() as a reference.
Fixes: #862
Reported-by: chris.zn <chris.zn@antfin.com>
Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>
Signed-off-by: chenglang.hy <chenglang.hy@antfin.com>
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Fixes: #829
Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>
Signed-off-by: Jielong Zhou <jielong.zjl@antfin.com>
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Adresses a deadlock with the rolled back change:
https://github.com/google/gvisor/commit/b6a5b950d28e0b474fdad160b88bc15314cf9259
Creating a session from an orphaned process group was causing a lock to be
acquired twice by a single goroutine. This behavior is addressed, and a test
(OrphanRegression) has been added to pty.cc.
Implemented the following ioctls:
- TIOCSCTTY - set controlling TTY
- TIOCNOTTY - remove controlling tty, maybe signal some other processes
- TIOCGPGRP - get foreground process group. Also enables tcgetpgrp().
- TIOCSPGRP - set foreground process group. Also enabled tcsetpgrp().
Next steps are to actually turn terminal-generated control characters (e.g. C^c)
into signals to the proper process groups, and to send SIGTTOU and SIGTTIN when
appropriate.
PiperOrigin-RevId: 270088599
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ENOTDIR has to be returned when a component used as a directory in
pathname is not, in fact, a directory.
PiperOrigin-RevId: 269037893
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This also allows the tee(2) implementation to be enabled, since dup can now be
properly supported via WriteTo.
Note that this change necessitated some minor restructoring with the
fs.FileOperations splice methods. If the *fs.File is passed through directly,
then only public API methods are accessible, which will deadlock immediately
since the locking is already done by fs.Splice. Instead, we pass through an
abstract io.Reader or io.Writer, which elide locks and use the underlying
fs.FileOperations directly.
PiperOrigin-RevId: 268805207
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They are no-ops, so the standard rule works fine.
PiperOrigin-RevId: 268776264
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PiperOrigin-RevId: 266496644
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PiperOrigin-RevId: 266491264
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PiperOrigin-RevId: 266229756
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PiperOrigin-RevId: 266177409
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This used to be the case, but regressed after a recent change.
Also made a few fixes around it and clean up the code a bit.
Closes #720
PiperOrigin-RevId: 265717496
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This is in accordance with newer parts of the standard library.
PiperOrigin-RevId: 263449916
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PiperOrigin-RevId: 263203441
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fsimpl is the keeper of all filesystem implementations in VFS2.
PiperOrigin-RevId: 262617869
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Added benchmark tests which emulate memfs benchmarks.
Stat benchmarks
BenchmarkVFS2Ext4fsStat/1-12 10000000 145 ns/op
BenchmarkVFS2Ext4fsStat/2-12 10000000 170 ns/op
BenchmarkVFS2Ext4fsStat/3-12 10000000 202 ns/op
BenchmarkVFS2Ext4fsStat/8-12 3000000 374 ns/op
BenchmarkVFS2Ext4fsStat/64-12 500000 2159 ns/op
BenchmarkVFS2Ext4fsStat/100-12 300000 3459 ns/op
BenchmarkVFS1TmpfsStat/1-12 5000000 348 ns/op
BenchmarkVFS1TmpfsStat/2-12 3000000 487 ns/op
BenchmarkVFS1TmpfsStat/3-12 2000000 655 ns/op
BenchmarkVFS1TmpfsStat/8-12 1000000 1365 ns/op
BenchmarkVFS1TmpfsStat/64-12 200000 9565 ns/op
BenchmarkVFS1TmpfsStat/100-12 100000 15158 ns/op
BenchmarkVFS2MemfsStat/1-12 10000000 133 ns/op
BenchmarkVFS2MemfsStat/2-12 10000000 155 ns/op
BenchmarkVFS2MemfsStat/3-12 10000000 182 ns/op
BenchmarkVFS2MemfsStat/8-12 5000000 310 ns/op
BenchmarkVFS2MemfsStat/64-12 1000000 1659 ns/op
BenchmarkVFS2MemfsStat/100-12 500000 2787 ns/op
Mount Stat benchmarks
BenchmarkVFS2ExtfsMountStat/1-12 5000000 245 ns/op
BenchmarkVFS2ExtfsMountStat/2-12 5000000 266 ns/op
BenchmarkVFS2ExtfsMountStat/3-12 5000000 304 ns/op
BenchmarkVFS2ExtfsMountStat/8-12 3000000 456 ns/op
BenchmarkVFS2ExtfsMountStat/64-12 500000 2308 ns/op
BenchmarkVFS2ExtfsMountStat/100-12 300000 3482 ns/op
BenchmarkVFS1TmpfsMountStat/1-12 3000000 488 ns/op
BenchmarkVFS1TmpfsMountStat/2-12 2000000 658 ns/op
BenchmarkVFS1TmpfsMountStat/3-12 2000000 806 ns/op
BenchmarkVFS1TmpfsMountStat/8-12 1000000 1514 ns/op
BenchmarkVFS1TmpfsMountStat/64-12 100000 10037 ns/op
BenchmarkVFS1TmpfsMountStat/100-12 100000 15280 ns/op
BenchmarkVFS2MemfsMountStat/1-12 10000000 212 ns/op
BenchmarkVFS2MemfsMountStat/2-12 5000000 232 ns/op
BenchmarkVFS2MemfsMountStat/3-12 5000000 264 ns/op
BenchmarkVFS2MemfsMountStat/8-12 3000000 390 ns/op
BenchmarkVFS2MemfsMountStat/64-12 1000000 1813 ns/op
BenchmarkVFS2MemfsMountStat/100-12 500000 2812 ns/op
PiperOrigin-RevId: 262477158
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Previously we were representing socket addresses as an interface{},
which allowed any type which could be binary.Marshal()ed to be used as
a socket address. This is fine when the address is passed to userspace
via the linux ABI, but is problematic when used from within the sentry
such as by networking procfs files.
PiperOrigin-RevId: 262460640
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PiperOrigin-RevId: 262264674
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PiperOrigin-RevId: 262249166
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PiperOrigin-RevId: 262242410
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PiperOrigin-RevId: 262226761
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- This also gets rid of pipes for now because pipe does not have vfs2 specific
support yet.
- Added file path resolution logic.
- Fixes testing infrastructure.
- Does not include unit tests yet.
PiperOrigin-RevId: 262213950
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(Don't worry, this is mostly tests.)
Implemented the following ioctls:
- TIOCSCTTY - set controlling TTY
- TIOCNOTTY - remove controlling tty, maybe signal some other processes
- TIOCGPGRP - get foreground process group. Also enables tcgetpgrp().
- TIOCSPGRP - set foreground process group. Also enabled tcsetpgrp().
Next steps are to actually turn terminal-generated control characters (e.g. C^c)
into signals to the proper process groups, and to send SIGTTOU and SIGTTIN when
appropriate.
PiperOrigin-RevId: 261387276
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We can get the mount namespace from the CreateProcessArgs in all cases where we
need it. This also gets rid of kernel.Destroy method, since the only thing it
was doing was DecRefing the mounts.
Removing the need to call kernel.SetRootMountNamespace also allowed for some
more simplifications in the container fs setup code.
PiperOrigin-RevId: 261357060
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This is the source of many warnings like:
AtomicRefCount 0x7f5ff84e3500 owned by "fs.Inode" garbage collected with ref count of 1 (want 0)
PiperOrigin-RevId: 261197093
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