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Chad Austin 3ac3738140 stop prefetching blobs on every open() 
Summary:
When a file's contents are not cached by the kernel, open(), read(),
and close() are all piped into the FUSE daemon. But when a file's
contents ARE cached by the kernel, only open() and close() are. Thus,
in the common case, the kernel will notify us that a file is being
opened, but read() will be served out of cache.

In that case, prefetching the blob is not beneficial, because it will
be dropped anyway upon close().

In situations where the VFS cache is hot but eden's own caches are
cold, this is probably a win.

Reviewed By: strager

Differential Revision: D10044546

fbshipit-source-id: eeb0854dbff021b2c73f1a42f31a94dd9fcf0837
2018-09-26 11:39:56 -07:00
CMake Rename generated client source file 2018-08-07 17:22:13 -07:00
common add more APIs to common/stats stubs 2018-07-27 14:36:42 -07:00
eden stop prefetching blobs on every open() 2018-09-26 11:39:56 -07:00
.gitignore ignore the entire external/ directory 2018-04-27 13:05:53 -07:00
CMakeLists.txt do not require SELinux in GitHub build 2018-07-27 13:22:57 -07:00
CONTRIBUTING.md Initial commit 2016-05-12 14:09:13 -07:00
getdeps.py enable rocksdb snappy support in GitHub build 2018-07-27 14:36:42 -07:00
LICENSE Initial commit 2016-05-12 14:09:13 -07:00
PATENTS Initial commit 2016-05-12 14:09:13 -07:00
README.md Fix a typo in Eden's README.md. 2016-05-13 09:32:03 -07:00

README.md

Eden

Eden is a project with several components, the most prominent of which is a virtual filesystem built using FUSE.

Caveat Emptor

Eden is still in early stages of development. We are making it available now because we plan to start making references to it from our other open source projects, such as Buck, Watchman, and Nuclide.

The version that we provide on GitHub does not build yet.

This is because the code is exported verbatim from an internal repository at Facebook, and not all of the scaffolding from our internal repository can be easily extracted. The key areas where we need to shore things up are:

  • The reinterpretations of build macros in DEFS.
  • A process for including third-party dependencies (presumably via Git submodules) and wiring up the external_deps argument in the build macros to point to them.
  • Providing the toolchain needed to power the [undocumented] thrift_library() rule in Buck.

The goal is to get Eden building on both Linux and OS X, though Linux support is expected to come first.