Split base/ into base/ and tools/

Signed-off-by: Riyaz Faizullabhoy <riyaz.faizullabhoy@docker.com>

tools/perf/Dockerfile

@@ -0,0 +1,35 @@
+FROM alpine:3.4
+
+RUN \
+  apk update && apk upgrade && \
+  apk add \
+  argp-standalone \
+  automake \
+  bc \
+  binutils-dev \
+  bison \
+  build-base \
+  curl \
+  flex \
+  libelf-dev \
+  linux-headers \
+  sed \
+  tar \
+  util-linux-dev \
+  xz \
+  && true
+
+ARG KERNEL_VERSION=4.9.3
+
+# get kernel source and extract it under /linux
+ENV KERNEL_SOURCE=https://www.kernel.org/pub/linux/kernel/v4.x/linux-${KERNEL_VERSION}.tar.xz
+RUN curl -fsSL -o linux-${KERNEL_VERSION}.tar.xz ${KERNEL_SOURCE}
+RUN cat linux-${KERNEL_VERSION}.tar.xz | tar --absolute-names -xJ &&  mv /linux-${KERNEL_VERSION} /linux
+
+RUN mkdir -p /build/perf && \
+    make -C /linux/tools/perf O=/build/perf LDFLAGS=-static
+
+WORKDIR /build/perf
+CMD ["tar", "cf", "-", "perf"]
+    
+