v3 Add TrIO support in EROFS · Pull Request !15218 · openEuler/kernel

PR sync from: Hongbo Li <lihongbo22@huawei.com>
https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/OQTRMP26BQBJRTVX25IQ77LC7FC6BHGI/ 
TrIO can accelerate the cold start of containers during on-demand loading.
It aggregates the read I/O operations required for container runtime
during the first container launch. In the following startups, TrIO pulls
the necessary I/O data to the container node in a single large I/O
operation and uses this I/O information to construct the runtime rootfs.
By improving the efficiency of network I/O, TrIO speeds up container
startup in on-demand loading scenarios.

TrIO consists of both kernel-space and user-space code. The kernel-space
code has been adapted at the overlayfs layer, introducing the
CONFIG_EROFS_TRIO configuration to provide isolation. The user-space
code requires adaptation by the user, and detailed usage methods are
introduced in the tools/trio/README.md section. Patches 1~2 correspond
to the kernel adaptations, while patches 3~4 are the scripts and best
practices that TrIO relies on for its operation.

v3:
  - Obtain and keep the trio_object in open.
  - Only close readahead in trio case.

Hongbo Li (4):
  erofs:trio: Add trio_manager in erofs
  erofs: trio: Support TrIO feature in erofs
  TrIO: Add tools for using TrIO
  TrIO: Add README.md

https://gitee.com/openeuler/release-management/issues/IBK2MJ

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