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Junichi Uekawa 9e1fae2a8b device: virtio: cache_symlinks in virtio-fs 
Symlink destination is not by default cached in FUSE. However every
binary fork/exec will try to load the same symlink over and over due to
jemalloc symlinks on ARCVM. It was costing approx 1ms on every app start
up on brya. Turn on the symlink caching behavior so that jemalloc
symlink does not cost as much.

Before, every guest side fork exec used to cause a read/readlinkat/write on the
pcivirtio-fs jemalloc mount point on ARCVM.

1690885281.169417 read(11, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000118>
1690885281.169780 readlinkat(20, "", "narenas:12,tcache:true,lg_tcache"..., 4096) = 39 <0.000103>
1690885281.170075 write(6, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000180>

BUG=b:294008709
TEST=on ARCVM strace pcivirtio-fs process threads for jemalloc:0 and
  jemalloc:1 and observe syscalls.  # none after being cached.

Pair: keiichiw@chromium.org
Change-Id: I832fb61c7b917f218697cb5807519af81794dc33
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4753629
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Commit-Queue: Junichi Uekawa <uekawa@chromium.org>
2023-08-25 09:09:11 +00:00
.cargo clippy: Disallow len_without_is_empty and len_zero 2023-05-22 21:27:21 +00:00
.config Enable test retries in nextest 2023-06-07 17:43:18 +00:00
.devcontainer dev_container: Replace better toml extension 2023-07-27 23:37:15 +00:00
.github Cleanup: Remove old, deprecated and no longer used files 2022-09-20 21:05:57 +00:00
.vscode Document feature flags and introduce new feature sets 2022-10-14 20:31:19 +00:00
aarch64 acpi: x86: add support for ACPI Notify() forwarding 2023-07-27 11:30:18 +00:00
acpi_tables acpi: aml: make the BufferData public 2023-05-05 22:26:02 +00:00
arch devices: fw_cfg: add --enable-fw-cfg argument 2023-08-24 16:45:37 +00:00
argh_helpers Update all copyright headers to match new style 2022-09-13 18:41:29 +00:00
audio_streams_conformance_test audio_streams_conformance_test: fix incorrect usage of argh 2023-08-21 06:44:26 +00:00
audio_util tree-wide: apply nightly rustfmt 2023-03-27 21:30:45 +00:00
base Cargo.toml: add version to chrono dependencies 2023-08-11 21:02:25 +00:00
bit_field bit_field: suppress clippy cast warnings 2023-04-10 23:41:28 +00:00
broker_ipc crash_report: refactor product specific code 2023-06-09 23:10:04 +00:00
common Replace internal p9 with crates.io versio 2023-08-14 18:34:51 +00:00
cros_async cros_async: epoll: dup FD once per source, instead of per op 2023-08-15 22:13:29 +00:00
cros_fdt clippy fixes for Rust 1.70 and 1.71 2023-07-13 20:29:05 +00:00
cros_tracing devices: replace usb_debug macro with cros_tracing 2023-07-04 04:52:24 +00:00
cros_tracing_types Upstream cros_tracing_types. 2023-05-11 18:08:00 +00:00
crosvm_cli devices: pci: remove AC97 codes 2023-08-11 03:29:31 +00:00
crosvm_control balloon: add optional response to adjust 2023-08-16 04:44:01 +00:00
crosvm_plugin Remove target_arch = "x86" checks 2023-08-18 23:36:47 +00:00
devices device: virtio: cache_symlinks in virtio-fs 2023-08-25 09:09:11 +00:00
disk crosvm: Rename to open_file_or_duplicate. 2023-07-24 01:30:27 +00:00
docs/book docs: add gfxstream release links, also FFI description 2023-08-23 23:31:37 +00:00
e2e_tests e2e_tests: Allow rootfs to be compressed and/or rw 2023-08-15 23:03:19 +00:00
fuse crosvm: Deprecate DataInit 2023-07-12 21:34:20 +00:00
fuzz devices: virtio: block: Implement Default for DiskOption 2023-08-22 21:03:40 +00:00
gpu_display gpu_display: delete unused field and method GpuDisplay::is_x 2023-08-18 18:23:25 +00:00
hypervisor Remove target_arch = "x86" checks 2023-08-18 23:36:47 +00:00
infra Roll recipe dependencies (trivial). 2023-08-25 01:27:12 +00:00
io_uring io_uring: update submission metadata after EINTR 2023-06-08 05:42:59 +00:00
jail seccomp: Add faccessat for aarch64 2023-08-25 01:52:43 +00:00
kernel_cmdline Rust 1.65: Fix clippy derive_partial_eq_without_eq lints 2022-12-01 01:32:30 +00:00
kernel_loader kernel_loader: Use Linux UAPI header for bindings 2023-05-30 12:21:18 +00:00
kvm Remove target_arch = "x86" checks 2023-08-18 23:36:47 +00:00
kvm_sys Remove target_arch = "x86" checks 2023-08-18 23:36:47 +00:00
libcras_stub devices: snd: Use PCM device client_type and stream_type for CRAS 2023-03-02 06:22:40 +00:00
linux_input_sys linux_input_sys: Move event code constants from virtio_input (devices 2023-08-17 21:31:24 +00:00
logo README: Use PNG logo image 2021-10-29 01:56:23 +00:00
media clippy fixes for Rust 1.70 and 1.71 2023-07-13 20:29:05 +00:00
metrics Cargo.toml: add version to chrono dependencies 2023-08-11 21:02:25 +00:00
net_sys Fix remaining Chrome/Chromium OS instances 2023-01-03 22:14:30 +00:00
net_util net: Make slirp capture optional even if feature is on 2023-08-14 23:24:19 +00:00
perfetto crosvm: Remove DataInit from windows components 2023-06-15 21:30:12 +00:00
power_monitor Cargo.toml: upgrade protobuf 2.x -> 3.x 2023-04-28 19:32:01 +00:00
prebuilts prebuilds/testvm: Retry downloads 2023-03-09 23:04:20 +00:00
proto_build_tools Cargo.toml: upgrade protobuf 2.x -> 3.x 2023-04-28 19:32:01 +00:00
protos Remove target_arch = "x86" checks 2023-08-18 23:36:47 +00:00
qcow_utils qcow_utils: Enable disk/qcow feature 2023-05-11 16:30:19 +00:00
resources resource: system_allocator: introduce GPE allocator 2023-02-06 22:02:37 +00:00
riscv64 riscv64: update generate_pci_root return value 2023-08-01 20:22:56 +00:00
rutabaga_gfx docs: add gfxstream release links, also FFI description 2023-08-23 23:31:37 +00:00
sandbox vhost-user: snd: Implement Windows broker & device setup 2023-02-28 21:34:01 +00:00
serde_keyvalue serde_keyvalue: add tests for outer-braces in arguments 2023-06-09 04:59:54 +00:00
src devices: fw_cfg: add --enable-fw-cfg argument 2023-08-24 16:45:37 +00:00
swap swap: count resident pages even while vmm-swap is disabled 2023-07-26 01:23:18 +00:00
system_api system_api: Remove UserDataAuth 2023-08-15 11:08:04 +00:00
tests Enable parallel execution of plugin and e2e tests 2023-01-26 20:38:57 +00:00
third_party vmm_vhost: renumber SHARED_MEMORY_REGIONS 2023-08-07 17:41:47 +00:00
tools tools: contrib: Add memstats_chart 2023-08-10 02:17:22 +00:00
tpm2 Add conditional compilation for unix-only crates 2023-01-19 21:21:59 +00:00
tpm2-sys Uprev the libtpm2 to 96017dcdb110 2023-03-07 04:05:49 +00:00
tube_transporter crosvm: Uprev rust toolchain and dev container 2023-02-08 20:26:30 +00:00
usb_sys devices: usb: Support Bulk Streams 2023-08-07 08:39:35 +00:00
usb_util devices: usb: Support Bulk Streams 2023-08-07 08:39:35 +00:00
vendor crash_report: refactor product specific code 2023-06-09 23:10:04 +00:00
vfio_sys acpi: x86: add support for ACPI Notify() forwarding 2023-07-27 11:30:18 +00:00
vhost crosvm: Add vhost scmi support 2023-06-22 23:25:03 +00:00
virtio_sys virtio: vsock: send TRANSPORT_RESET event on restore 2023-07-14 21:27:23 +00:00
vm_control Remove target_arch = "x86" checks 2023-08-18 23:36:47 +00:00
vm_memory clippy fixes for Rust 1.70 and 1.71 2023-07-13 20:29:05 +00:00
win_audio net_util/win_audio: Do not use cfg conditional compilation in build.rs 2023-05-09 20:27:26 +00:00
win_util metrics: upstream local metrics related changes 2023-06-13 21:57:14 +00:00
x86_64 devices: fw_cfg: add --enable-fw-cfg argument 2023-08-24 16:45:37 +00:00
.dockerignore add docker supported builds and tests 2019-05-15 13:36:19 -07:00
.envrc Automatically register tools/ on PATH 2023-03-03 00:33:15 +00:00
.gitignore Automatically register tools/ on PATH 2023-03-03 00:33:15 +00:00
.gitmodules third_party: Add crosvm/perfetto submodule 2023-07-21 05:01:47 +00:00
.rustfmt.toml rustfmt, win_util: update to 2021 edition 2022-05-31 23:35:02 +00:00
ARCHITECTURE.md docs: book: update architecture docs 2023-06-01 22:37:17 +00:00
Cargo.lock rutabaga_gfx: release commit 0.1.2 2023-08-23 01:02:33 +00:00
Cargo.toml Replace internal p9 with crates.io versio 2023-08-14 18:34:51 +00:00
CONTRIBUTING.md CONTRIBUTION.md : update incorrect command in docs 2023-08-03 19:36:52 +00:00
DIR_METADATA DIR_METADATA: Add public buganizer component 2022-09-21 17:43:59 +00:00
LICENSE Update all copyright headers to match new style 2022-09-13 18:41:29 +00:00
mypy.ini Add python configs for consistency between IDE and CI 2022-08-16 18:33:23 +00:00
OWNERS OWNERS: Add takayas@ to OWNERS 2023-04-24 11:15:25 +00:00
OWNERS_COUNCIL Require council review for changes to Cargo.lock 2022-12-01 18:50:48 +00:00
PRESUBMIT.cfg Cleanup: Remove old, deprecated and no longer used files 2022-09-20 21:05:57 +00:00
pyproject.toml Add python configs for consistency between IDE and CI 2022-08-16 18:33:23 +00:00
README.chromeos.md crosvm: update book and doc links to crosvm.dev 2022-07-29 22:54:01 +00:00
README.md Fix remaining Chrome/Chromium OS instances 2023-01-03 22:14:30 +00:00
rust-toolchain Upgrade to 1.68.2: Set default version and rebuild container 2023-05-25 18:30:55 +00:00

README.md

crosvm - The ChromeOS Virtual Machine Monitor

crosvm is a virtual machine monitor (VMM) based on Linux’s KVM hypervisor, with a focus on simplicity, security, and speed. crosvm is intended to run Linux guests, originally as a security boundary for running native applications on the ChromeOS platform. Compared to QEMU, crosvm doesn’t emulate architectures or real hardware, instead concentrating on paravirtualized devices, such as the virtio standard.

crosvm is currently used to run Linux/Android guests on ChromeOS devices.

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