From f86699a94bdde7d973ba5d6fa3e7ca4ab2f234fb Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Fri, 8 May 2026 19:43:33 +0300
Subject: add duration metric, tolerate missing tracepoints, ship el8 build

- Bubbles, treemap, icicle, and the live flamegraph 'b' cycle now include
  syscall duration (sum) as a third metric alongside events and bytes.
  Statsengine snapshots expose TotalLatencyNs to support this.
- AttachAll takes an optional warn callback. Production passes one so older
  kernels that lack newer tracepoints log a warning and keep going instead
  of aborting startup.
- Dockerfile.el8 + scripts/build-with-docker-el8.sh + mage buildDockerEl8
  produce ior.el8, a static binary built against Rocky Linux 8 glibc for
  RHEL/Rocky/Alma 8 hosts.
- README.md documents installing mage and the new el8 target.
---
 scripts/build-with-docker-el8.sh | 56 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100755 scripts/build-with-docker-el8.sh

(limited to 'scripts')

diff --git a/scripts/build-with-docker-el8.sh b/scripts/build-with-docker-el8.sh
new file mode 100755
index 0000000..9ee35ba
--- /dev/null
+++ b/scripts/build-with-docker-el8.sh
@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+# Build the ior binary inside a Rocky Linux 8 container and write it as
+# ior.el8 to the repo root.  The container image is built once and reused on
+# subsequent runs.  Mirrors scripts/build-with-docker.sh but targets Rocky 8
+# so the produced binary runs on hosts with the older glibc shipped there.
+#
+# Usage:
+#   ./build-with-docker-el8.sh          # build image + compile ior.el8
+#   ./build-with-docker-el8.sh --build  # force rebuild of the Docker image
+#   ./build-with-docker-el8.sh --run    # skip image build, only compile ior.el8
+set -euo pipefail
+
+IMAGE="ior-builder:rocky8"
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+DOCKERFILE="${REPO_ROOT}/Dockerfile.el8"
+
+# Derive the Go version from go.mod so the Docker image always matches the
+# minimum toolchain declared by the project.
+GO_VERSION="$(grep '^go ' "${REPO_ROOT}/go.mod" | awk '{print $2}')"
+
+BUILD_IMAGE=true
+RUN_BUILD=true
+
+for arg in "$@"; do
+    case "$arg" in
+        --build) BUILD_IMAGE=true; RUN_BUILD=false ;;
+        --run)   BUILD_IMAGE=false; RUN_BUILD=true  ;;
+    esac
+done
+
+if $BUILD_IMAGE; then
+    echo "==> Building Docker image ${IMAGE} (this takes ~15-20 min on first run)..."
+    docker build --platform=linux/amd64 \
+        --build-arg "GO_VERSION=${GO_VERSION}" \
+        -f "${DOCKERFILE}" \
+        -t "${IMAGE}" \
+        "${REPO_ROOT}"
+    echo "==> Image build complete."
+fi
+
+if $RUN_BUILD; then
+    echo "==> Compiling ior.el8 inside the container..."
+    # --privileged gives full host capabilities.
+    # tracefs (/sys/kernel/tracing) and BTF (/sys/kernel/btf) are not auto-mounted
+    # by Docker even with --privileged, so they are mounted explicitly:
+    #   - /sys/kernel/tracing  : mage generate reads available syscall tracepoints
+    #   - /sys/kernel/btf      : mage bpfBuild reads vmlinux BTF for vmlinux.h
+    docker run --rm \
+        --platform=linux/amd64 \
+        --privileged \
+        -v /sys/kernel/tracing:/sys/kernel/tracing \
+        -v /sys/kernel/btf:/sys/kernel/btf \
+        -v "${REPO_ROOT}:/git/ior" \
+        "${IMAGE}"
+    echo "==> Done. Binary written to ${REPO_ROOT}/ior.el8"
+fi
-- 
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