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View Code? Open in Web Editor NEWthe price of overlayfs' copy up "visualized"
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the price of overlayfs' copy up "visualized"
Home Page: https://ops.tips/notes/practical-look-into-overlayfs/
create an overlay-based directory tree with a large file in the lower dir mkdir ./merged ./work ./upper ./lower dd if=/dev/zero of=./lower/a bs=$((1 << 12)) count=$((1 << 18)) 262144+0 records in 262144+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.804386 s, 1.3 GB/s sudo mount \ -t overlay \ overlay \ -o lowerdir=./lower,upperdir=./upper,workdir=./work \ ./merged tree . ├── lower │ └── a ├── merged │ └── a └── upper (this can be done with `make setup`) run the tracer, and then perform a `chown(2)` in `merged/a` to see the cost of a copy up sudo ./trace.bt PID COMM NAME LEN(B) ELAPSED (ms) 12752 a.out ./merged/a 1073741824 780 (for an example `chown(2)`ing thing, see `./main.c`) LICENSE - MIT
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