diff --git a/src/bootstrap/src/core/build_steps/dist.rs b/src/bootstrap/src/core/build_steps/dist.rs
index 91039d0c8dcc1..60b1ff3e4413e 100644
--- a/src/bootstrap/src/core/build_steps/dist.rs
+++ b/src/bootstrap/src/core/build_steps/dist.rs
@@ -1041,6 +1041,21 @@ impl Step for PlainSourceTarball {
                 .env("RUSTC_BOOTSTRAP", "1")
                 .current_dir(plain_dst_src);
 
+            // Vendor packages that are required by opt-dist to collect PGO profiles.
+            let pkgs_for_pgo_training = build_helper::LLVM_PGO_CRATES
+                .iter()
+                .chain(build_helper::RUSTC_PGO_CRATES)
+                .map(|pkg| {
+                    let mut manifest_path =
+                        builder.src.join("./src/tools/rustc-perf/collector/compile-benchmarks");
+                    manifest_path.push(pkg);
+                    manifest_path.push("Cargo.toml");
+                    manifest_path
+                });
+            for manifest_path in pkgs_for_pgo_training {
+                cmd.arg("--sync").arg(manifest_path);
+            }
+
             let config = if !builder.config.dry_run() {
                 t!(String::from_utf8(t!(cmd.output()).stdout))
             } else {
diff --git a/src/tools/build_helper/README.md b/src/tools/build_helper/README.md
new file mode 100644
index 0000000000000..f81b631c3fdbf
--- /dev/null
+++ b/src/tools/build_helper/README.md
@@ -0,0 +1 @@
+Types and functions shared across tools in this workspace.
diff --git a/src/tools/build_helper/src/lib.rs b/src/tools/build_helper/src/lib.rs
index 2abda5d3ebf27..15807d1c0d8f8 100644
--- a/src/tools/build_helper/src/lib.rs
+++ b/src/tools/build_helper/src/lib.rs
@@ -1,5 +1,30 @@
+//! Types and functions shared across tools in this workspace.
+
 pub mod ci;
 pub mod git;
 pub mod metrics;
 pub mod stage0_parser;
 pub mod util;
+
+/// The default set of crates for opt-dist to collect LLVM profiles.
+pub const LLVM_PGO_CRATES: &[&str] = &[
+    "syn-1.0.89",
+    "cargo-0.60.0",
+    "serde-1.0.136",
+    "ripgrep-13.0.0",
+    "regex-1.5.5",
+    "clap-3.1.6",
+    "hyper-0.14.18",
+];
+
+/// The default set of crates for opt-dist to collect rustc profiles.
+pub const RUSTC_PGO_CRATES: &[&str] = &[
+    "externs",
+    "ctfe-stress-5",
+    "cargo-0.60.0",
+    "token-stream-stress",
+    "match-stress",
+    "tuple-stress",
+    "diesel-1.4.8",
+    "bitmaps-3.1.0",
+];
diff --git a/src/tools/opt-dist/src/training.rs b/src/tools/opt-dist/src/training.rs
index 09263dc645e2d..89f4d8957c8bf 100644
--- a/src/tools/opt-dist/src/training.rs
+++ b/src/tools/opt-dist/src/training.rs
@@ -3,30 +3,10 @@ use crate::exec::{cmd, CmdBuilder};
 use crate::utils::io::{count_files, delete_directory};
 use crate::utils::with_log_group;
 use anyhow::Context;
+use build_helper::{LLVM_PGO_CRATES, RUSTC_PGO_CRATES};
 use camino::{Utf8Path, Utf8PathBuf};
 use humansize::BINARY;
 
-const LLVM_PGO_CRATES: &[&str] = &[
-    "syn-1.0.89",
-    "cargo-0.60.0",
-    "serde-1.0.136",
-    "ripgrep-13.0.0",
-    "regex-1.5.5",
-    "clap-3.1.6",
-    "hyper-0.14.18",
-];
-
-const RUSTC_PGO_CRATES: &[&str] = &[
-    "externs",
-    "ctfe-stress-5",
-    "cargo-0.60.0",
-    "token-stream-stress",
-    "match-stress",
-    "tuple-stress",
-    "diesel-1.4.8",
-    "bitmaps-3.1.0",
-];
-
 fn init_compiler_benchmarks(
     env: &Environment,
     profiles: &[&str],
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index efcd2a181ffa2..7b93b09dda24b 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -67,6 +67,7 @@ pub(crate) const WORKSPACES: &[(&str, ExceptionList, Option<(&[&str], &[&str])>)
     //("src/tools/miri/test-cargo-miri", &[], None), // FIXME uncomment once all deps are vendored
     //("src/tools/miri/test_dependencies", &[], None), // FIXME uncomment once all deps are vendored
     ("src/tools/rust-analyzer", EXCEPTIONS_RUST_ANALYZER, None),
+    ("src/tools/rustc-perf", EXCEPTIONS_RUSTC_PERF, None),
     ("src/tools/x", &[], None),
     // tidy-alphabetical-end
 ];
@@ -142,6 +143,22 @@ const EXCEPTIONS_RUST_ANALYZER: ExceptionList = &[
     // tidy-alphabetical-end
 ];
 
+const EXCEPTIONS_RUSTC_PERF: ExceptionList = &[
+    // tidy-alphabetical-start
+    ("alloc-no-stdlib", "BSD-3-Clause"),
+    ("alloc-stdlib", "BSD-3-Clause"),
+    ("brotli", "BSD-3-Clause/MIT"),
+    ("brotli-decompressor", "BSD-3-Clause/MIT"),
+    ("encoding_rs", "(Apache-2.0 OR MIT) AND BSD-3-Clause"),
+    ("inferno", "CDDL-1.0"),
+    ("instant", "BSD-3-Clause"),
+    ("ring", NON_STANDARD_LICENSE), // see EXCEPTIONS_NON_STANDARD_LICENSE_DEPS for more.
+    ("ryu", "Apache-2.0 OR BSL-1.0"),
+    ("snap", "BSD-3-Clause"),
+    ("subtle", "BSD-3-Clause"),
+    // tidy-alphabetical-end
+];
+
 const EXCEPTIONS_CRANELIFT: ExceptionList = &[
     // tidy-alphabetical-start
     ("cranelift-bforest", "Apache-2.0 WITH LLVM-exception"),
@@ -178,6 +195,20 @@ const EXCEPTIONS_UEFI_QEMU_TEST: ExceptionList = &[
     ("r-efi", "MIT OR Apache-2.0 OR LGPL-2.1-or-later"), // LGPL is not acceptible, but we use it under MIT OR Apache-2.0
 ];
 
+/// Placeholder for non-standard license file.
+const NON_STANDARD_LICENSE: &str = "NON_STANDARD_LICENSE";
+
+/// These dependencies have non-standard licenses but are genenrally permitted.
+const EXCEPTIONS_NON_STANDARD_LICENSE_DEPS: &[&str] = &[
+    // `ring` is included because it is an optional dependency of `hyper`,
+    // which is a training data in rustc-perf for optimized build.
+    // The license of it is generally `ISC AND MIT AND OpenSSL`,
+    // though the `package.license` field is not set.
+    //
+    // See https://github.com/briansmith/ring/issues/902
+    "ring",
+];
+
 /// These are the root crates that are part of the runtime. The licenses for
 /// these and all their dependencies *must not* be in the exception list.
 const RUNTIME_CRATES: &[&str] = &["std", "core", "alloc", "test", "panic_abort", "panic_unwind"];
@@ -610,6 +641,11 @@ fn check_license_exceptions(metadata: &Metadata, exceptions: &[(&str, &str)], ba
         for pkg in metadata.packages.iter().filter(|p| p.name == *name) {
             match &pkg.license {
                 None => {
+                    if *license == NON_STANDARD_LICENSE
+                        && EXCEPTIONS_NON_STANDARD_LICENSE_DEPS.contains(&pkg.name.as_str())
+                    {
+                        continue;
+                    }
                     tidy_error!(
                         bad,
                         "dependency exception `{}` does not declare a license expression",
diff --git a/src/tools/tidy/src/extdeps.rs b/src/tools/tidy/src/extdeps.rs
index ff71ca537256f..2118de5f20411 100644
--- a/src/tools/tidy/src/extdeps.rs
+++ b/src/tools/tidy/src/extdeps.rs
@@ -4,7 +4,11 @@ use std::fs;
 use std::path::Path;
 
 /// List of allowed sources for packages.
-const ALLOWED_SOURCES: &[&str] = &["\"registry+https://github.com/rust-lang/crates.io-index\""];
+const ALLOWED_SOURCES: &[&str] = &[
+    r#""registry+https://github.com/rust-lang/crates.io-index""#,
+    // This is `rust_team_data` used by `site` in src/tools/rustc-perf,
+    r#""git+https://github.com/rust-lang/team#a5260e76d3aa894c64c56e6ddc8545b9a98043ec""#,
+];
 
 /// Checks for external package sources. `root` is the path to the directory that contains the
 /// workspace `Cargo.toml`.