diff --git a/utils/bazel/.bazelrc b/utils/bazel/.bazelrc
--- a/utils/bazel/.bazelrc
+++ b/utils/bazel/.bazelrc
@@ -168,9 +168,10 @@
 # Speedup bazel using a ramdisk.
 build:ci --sandbox_base=/dev/shm
 
-# Use system's mpfr instead of building it from source.
+# Use system's mpfr and pfm instead of building it from source.
 # This is non hermetic but helps with compile time.
 build:ci --@llvm-project//libc:mpfr=system
+build:ci --@llvm-project//llvm:pfm=system
 
 # Don't build/test targets tagged with "nobuildkite".
 build:ci --build_tag_filters=-nobuildkite
diff --git a/utils/bazel/WORKSPACE b/utils/bazel/WORKSPACE
--- a/utils/bazel/WORKSPACE
+++ b/utils/bazel/WORKSPACE
@@ -4,7 +4,7 @@
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
-load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository", "new_git_repository")
 
 SKYLIB_VERSION = "1.3.0"
 
@@ -19,8 +19,8 @@
 
 new_local_repository(
     name = "llvm-raw",
-    path = "../../",
     build_file_content = "# empty",
+    path = "../../",
 )
 
 load("@llvm-raw//utils/bazel:configure.bzl", "llvm_configure")
@@ -81,11 +81,12 @@
 
 git_repository(
     name = "rules_foreign_cc",
+    remote = "https://github.com/bazelbuild/rules_foreign_cc.git",
     tag = "0.9.0",
-    remote = "https://github.com/bazelbuild/rules_foreign_cc.git"
 )
 
 load("@rules_foreign_cc//foreign_cc:repositories.bzl", "rules_foreign_cc_dependencies")
+
 rules_foreign_cc_dependencies()
 
 maybe(
@@ -110,3 +111,10 @@
     urls = ["https://www.mpfr.org/mpfr-current/mpfr-4.1.1.tar.gz"],
 )
 
+maybe(
+    new_git_repository,
+    name = "pfm",
+    build_file = "@llvm-raw//utils/bazel/third_party_build:pfm.BUILD",
+    remote = "https://git.code.sf.net/p/perfmon2/libpfm4",
+    tag = "v4.12.1",
+)
diff --git a/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel b/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
--- a/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
@@ -2,6 +2,7 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
 load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
 load(":tblgen.bzl", "gentbl")
 load(":config.bzl", "llvm_config_defines")
@@ -2722,6 +2723,50 @@
     ],
 )
 
+# A flag to pick which `pfm` to use for Exegesis.
+# Usage: `--@llvm-project//llvm:pfm=<disable|external|system>`.
+# Flag documentation: https://bazel.build/extending/config
+string_flag(
+    name = "pfm",
+    build_setting_default = "external",
+    values = [
+        "disable",  # Don't include pfm at all
+        "external",  # Build pfm from source
+        "system",  # Use system pfm (non hermetic)
+    ],
+)
+
+config_setting(
+    name = "pfm_disable",
+    flag_values = {":pfm": "disable"},
+)
+
+config_setting(
+    name = "pfm_external",
+    flag_values = {":pfm": "external"},
+)
+
+config_setting(
+    name = "pfm_system",
+    flag_values = {":pfm": "system"},
+)
+
+cc_library(
+    name = "maybe_pfm",
+    # We want dependencies of this library to have -DHAVE_LIBPFM conditionally
+    # defined, so we set `defines` instead of `copts`.
+    defines = select({
+        ":pfm_external": ["HAVE_LIBPFM=1"],
+        ":pfm_system": ["HAVE_LIBPFM=1"],
+        "//conditions:default": [],
+    }),
+    deps = select({
+        ":pfm_external": ["@pfm//:pfm_external"],
+        ":pfm_system": ["@pfm//:pfm_system"],
+        "//conditions:default": [],
+    }),
+)
+
 cc_library(
     name = "Exegesis",
     srcs = glob([
@@ -2758,6 +2803,7 @@
         ":Support",
         ":Target",
         ":config",
+        ":maybe_pfm",
     ],
 )
 
diff --git a/utils/bazel/third_party_build/pfm.BUILD b/utils/bazel/third_party_build/pfm.BUILD
new file mode 100644
--- /dev/null
+++ b/utils/bazel/third_party_build/pfm.BUILD
@@ -0,0 +1,31 @@
+# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+load("@rules_foreign_cc//foreign_cc:defs.bzl", "make_variant")
+
+filegroup(
+    name = "sources",
+    srcs = glob(["**"]),
+)
+
+make_variant(
+    name = "pfm",
+    copts = ["-w"],
+    lib_name = "libpfm",
+    lib_source = ":sources",
+    toolchain = "@rules_foreign_cc//toolchains:preinstalled_autoconf_toolchain",
+    visibility = ["//visibility:public"],
+)
+
+alias(
+    name = "pfm_external",
+    actual = "@pfm//:pfm_",
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "pfm_system",
+    linkopts = ["-lpfm"],
+    visibility = ["//visibility:public"],
+)