Handling page faults using userfaultfd for all the time after vmm-swap
is enabled originally has overhead. By disabling swapping, we can use
crosvm without the overhead when the crosvm become used heavily again.
This also refactor PageHandler and extract register logic to lib.rs.
BUG=b:215093219
TEST=cargo test -p swap
Change-Id: Id81d84ebe40067b4f19b212f6b81cbaf249c0c3c
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4005474
Reviewed-by: David Stevens <stevensd@chromium.org>
Commit-Queue: Shin Kawamura <kawasin@google.com>
userfaultfd returns ENOMEM on register if the corresponding process is
obsolete (e.g. the process dies, memory space is refleshed by execve).
BUG=b:253555760
TEST=cargo test -p swap
Change-Id: I9a6a7f0ed45cdc91bdf17e5d29e4c215b7f575a5
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4025736
Reviewed-by: David Stevens <stevensd@chromium.org>
Commit-Queue: Shin Kawamura <kawasin@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Directories from TempDir::into_path() are not automatically deleted.
We should use TempDir::path() instead.
BUG=b:253555760
TEST=cargo test -p swap
Change-Id: I9f0c5398a7eaa16317f9e40f16231f9b7df0a3a5
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4033426
Reviewed-by: David Stevens <stevensd@chromium.org>
Commit-Queue: Shin Kawamura <kawasin@google.com>
origin:
https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3944711
PageHandler handles events from userfaultfd using SwapFile.
tests are placed as integration tests since they rely on userfaultfd(2).
design document: go/tanooki-phase1-dd
BUG=b:215093219
TEST=cargo test -p swap page_handler
Change-Id: I64d213d27174d75ee618c4675ea52dbac58bfe59
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4016144
Reviewed-by: David Stevens <stevensd@chromium.org>
Commit-Queue: Shin Kawamura <kawasin@google.com>
