The new command "crosvm swap log_pagefault <socket>" starts logging
page fault events. The log file "page_fault.log" will be located under
the swap directory.
Pagefault event log help up debugging the vmm-swap feature and
understand the memory usage of the guest os.
design document: go/tanooki-phase1-dd
BUG=b:253555760
TEST=manually tested. this is debug feature.
Change-Id: I13e36cef873cd83179032fe8a289c8df71384644
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3954806
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-by: David Stevens <stevensd@chromium.org>
Commit-Queue: Shin Kawamura <kawasin@google.com>
Added new crosvm commands "crosvm swap enable" and "crosvm swap status".
swap crate exposes SwapController to control the vmm-swap feature.
When vmm-swap is enabled, all the pages on the GuestMemory are swapped
out to a file and are freed to give a lot of memory back to OS.
design document: go/tanooki-phase1-dd
BUG=b:215093219
TEST=manually tested
Change-Id: Ideb10b0119edd9f47b66c8ac61add21ac08181d4
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3871758
Reviewed-by: David Stevens <stevensd@chromium.org>
Commit-Queue: Shin Kawamura <kawasin@google.com>
origin:
https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3932497
ProcessesGuard stops all the crosvm processes except the caller process
using SIGSTOP signal because we must guarantee that no one changes the
guest memory contents while vmm-swap out.
This is a short term solution and will be replaced with device
suspension feature later.
See the "Write back atomicity" section in go/tanooki-phase1-dd
BUG=b:215093219
TEST=cargo build --features=swap
Change-Id: I34e528bf318e5ff9277048f3daf8608e7b09ddc7
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4016145
Reviewed-by: David Stevens <stevensd@chromium.org>
Commit-Queue: Shin Kawamura <kawasin@google.com>
ProcessesGuard stops all the crosvm processes except the caller process
using SIGSTOP signal because we must guarantee that no one changes the
guest memory contents while vmm-swap out.
This is a short term solution and will be replaced with device
suspension feature later.
See the "Write back atomicity" section in go/tanooki-phase1-dd
BUG=b:215093219
TEST=cargo build --features=swap
Change-Id: Ie62a0cf537a045128c0d298e7a73d222fea96ef0
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3932497
Reviewed-by: David Stevens <stevensd@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
SwapFile saves the active pages in the memory region to a file.
design document: go/tanooki-phase1-dd
BUG=b:215093219
TEST=cargo test -p swap
Change-Id: I4ce16eef36ace832d26622e44444f7549299c1e7
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3930082
Reviewed-by: David Stevens <stevensd@chromium.org>
userfaultfd enables applications to handle page faults on designated
memory area.
vmm-swap feature uses userfaultfd to catch page fault event and swap
in the guest memory from the swap file.
design document: go/tanooki-phase1-dd
BUG=b:215093219
TEST=cargo build --features=swap
Change-Id: I13ae09cd97e4215b00e5d834d4f97eb6b507b892
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3895235
Reviewed-by: David Stevens <stevensd@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
