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linux: Allow running without chromeos-low_mem

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Keep desktop builds running by making the cros-specific low memory
device optional.

BUG=none
TEST=Boot a kernel with crosvm on ubuntu desktop

Change-Id: I3c90a40e877fee8ed6763de027b0e25deec36373
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1157198
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
This commit is contained in:
Dylan Reid 2018-07-31 10:24:06 -07:00 committed by chrome-bot
parent 658357638c
commit f11e6ed8e8
1 changed files with 41 additions and 27 deletions
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68
src/linux.rs
View file

@ -74,7 +74,6 @@ pub enum Error {
NetDeviceNew(devices::virtio::NetError),
NoVarEmpty,
OpenKernel(PathBuf, io::Error),
OpenLowMem(io::Error),
PollContextAdd(sys_util::Error),
PollContextDelete(sys_util::Error),
QcowDeviceCreate(qcow::Error),
@ -140,7 +139,6 @@ impl fmt::Display for Error {
&Error::OpenKernel(ref p, ref e) => {
write!(f, "failed to open kernel image {:?}: {}", p, e)
}
&Error::OpenLowMem(ref e) => write!(f, "failed to open /dev/chromeos-low-mem: {}", e),
&Error::PollContextAdd(ref e) => write!(f, "failed to add fd to poll context: {:?}", e),
&Error::PollContextDelete(ref e) => {
write!(f, "failed to remove fd from poll context: {:?}", e)
@ -789,8 +787,12 @@ fn run_control(mut linux: RunnableLinuxVm) -> Result<()> {
}
// Watch for low memory notifications and take memory back from the VM.
let low_mem = File::open("/dev/chromeos-low-mem").map_err(Error::OpenLowMem)?;
poll_ctx.add(&low_mem, Token::LowMemory).map_err(Error::PollContextAdd)?;
let low_mem = File::open("/dev/chromeos-low-mem").ok();
if let Some(ref low_mem) = low_mem {
poll_ctx.add(low_mem, Token::LowMemory).map_err(Error::PollContextAdd)?;
} else {
warn!("Unable to open low mem indicator, maybe not a chrome os kernel");
}
// Used to rate limit balloon requests.
let mut lowmem_timer = TimerFd::new().map_err(Error::CreateTimerFd)?;
@ -890,36 +892,48 @@ fn run_control(mut linux: RunnableLinuxVm) -> Result<()> {
}
}
Token::LowMemory => {
let old_balloon_memory = current_balloon_memory;
current_balloon_memory = min(current_balloon_memory + balloon_memory_increment, max_balloon_memory);
if current_balloon_memory != old_balloon_memory {
let mut buf = [0u8; mem::size_of::<u64>()];
LittleEndian::write_u64(&mut buf, current_balloon_memory);
if let Err(e) = linux.balloon_host_socket.send(&buf) {
warn!("failed to send memory value to balloon device: {}", e);
if let Some(ref low_mem) = low_mem {
let old_balloon_memory = current_balloon_memory;
current_balloon_memory =
min(current_balloon_memory + balloon_memory_increment,
max_balloon_memory);
if current_balloon_memory != old_balloon_memory {
let mut buf = [0u8; mem::size_of::<u64>()];
LittleEndian::write_u64(&mut buf, current_balloon_memory);
if let Err(e) = linux.balloon_host_socket.send(&buf) {
warn!("failed to send memory value to balloon device: {}", e);
}
}
// Stop polling the lowmem device until the timer fires.
poll_ctx.delete(low_mem).map_err(Error::PollContextDelete)?;
// Add some jitter to the timer so that if there are multiple VMs running
// they don't all start ballooning at exactly the same time.
let lowmem_dur =
Duration::from_millis(1000 + lowmem_jitter_ms.ind_sample(&mut rng));
lowmem_timer.reset(lowmem_dur, None).map_err(Error::ResetTimerFd)?;
// Also start a timer to check when we can start giving memory back. Do the
// first check after a minute (with jitter) and subsequent checks after
// every 30 seconds (with jitter).
let freemem_dur =
Duration::from_secs(60 + freemem_jitter_secs.ind_sample(&mut rng));
let freemem_int =
Duration::from_secs(30 + interval_jitter_secs.ind_sample(&mut rng));
freemem_timer
.reset(freemem_dur, Some(freemem_int))
.map_err(Error::ResetTimerFd)?;
}
// Stop polling the lowmem device until the timer fires.
poll_ctx.delete(&low_mem).map_err(Error::PollContextDelete)?;
// Add some jitter to the timer so that if there are multiple VMs running they don't
// all start ballooning at exactly the same time.
let lowmem_dur = Duration::from_millis(1000 + lowmem_jitter_ms.ind_sample(&mut rng));
lowmem_timer.reset(lowmem_dur, None).map_err(Error::ResetTimerFd)?;
// Also start a timer to check when we can start giving memory back. Do the first check
// after a minute (with jitter) and subsequent checks after every 30 seconds (with jitter).
let freemem_dur = Duration::from_secs(60 + freemem_jitter_secs.ind_sample(&mut rng));
let freemem_int = Duration::from_secs(30 + interval_jitter_secs.ind_sample(&mut rng));
freemem_timer.reset(freemem_dur, Some(freemem_int)).map_err(Error::ResetTimerFd)?;
}
Token::LowmemTimer => {
// Acknowledge the timer.
lowmem_timer.wait().map_err(Error::TimerFd)?;
// Start polling the lowmem device again.
poll_ctx.add(&low_mem, Token::LowMemory).map_err(Error::PollContextAdd)?;
if let Some(ref low_mem) = low_mem {
// Start polling the lowmem device again.
poll_ctx.add(low_mem, Token::LowMemory).map_err(Error::PollContextAdd)?;
}
}
Token::VmControl { index } => {
if let Some(socket) = linux.control_sockets.get(index as usize) {