[BOLT][docs] Add merge-fdata to Linux optimization guide #97659
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maksfb
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aaupov,
rafaelauler,
ayermolo and
dcci
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@llvm/pr-subscribers-bolt Author: Maksim Panchenko (maksfb) ChangesFull diff: https://github.com/llvm/llvm-project/pull/97659.diff 1 Files Affected:
diff --git a/bolt/docs/OptimizingLinux.md b/bolt/docs/OptimizingLinux.md
index 1fffcf2252906..0045f0ead9fd0 100644
--- a/bolt/docs/OptimizingLinux.md
+++ b/bolt/docs/OptimizingLinux.md
@@ -44,6 +44,11 @@ $ perf2bolt -p perf.data -o perf.fdata vmlinux
Under a high load, `perf.data` should be several gigabytes in size and you should expect the converted `perf.fdata` not to exceed 100 MB.
+Profiles collected from multiple workloads could be joined into a single profile using `merge-fdata` utility:
+```bash
+$ merge-fdata perf.1.fdata perf.2.fdata ... perf.<N>.fdata > perf.merged.fdata
+```
+
Two changes are required for the kernel build. The first one is optional but highly recommended. It introduces a BOLT-reserved space into `vmlinux` code section:
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kbluck
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Jul 6, 2024
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