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docs: Update instructions to point to new profiling target

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This removes the need for the user to manually change the Cargo.toml
file for profiling.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2023-01-17 12:53:13 +00:00
parent c6d3f61a42
commit e2886a4b1f
1 changed files with 2 additions and 10 deletions
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12
docs/profiling.md
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@ -4,20 +4,12 @@
## Building a suitable binary
Modify the `Cargo.toml` file to add `debug = 1` to the `[profile.release]` block. It should look like this:
```
[profile.release]
lto = true
debug = 1
```
This adds the symbol information to the release binary but does not otherwise affect the performance.
The binary must also be built with frame pointers included so that the call graph can be captured by the profiler.
```
$ cargo clean && RUSTFLAGS='-C force-frame-pointers=y' cargo build --release
$ cargo clean && RUSTFLAGS='-C force-frame-pointers=y' cargo build --profile profiling
```
## Profiling
@ -27,7 +19,7 @@ $ cargo clean && RUSTFLAGS='-C force-frame-pointers=y' cargo build --release
e.g.
```
$ perf record -g target/release/cloud-hypervisor \
$ perf record -g target/profiling/cloud-hypervisor \
--kernel ~/src/linux/vmlinux \
--pmem file=~/workloads/focal.raw \
--cpus boot=1 --memory size=1G \