lkmc v2-rc

Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it
breaks bisects at several points. All bugs will not bisect to this
humongous change.

It all started with a conversion of the Bash scripts to Python, mainly
because I couldn't stand not being able to properly use --options for
run which has a million options.

Then since that required a full testing, I decided to do all the
refactorings that I had in mind at once, and so I did and it became
v2-rc.

This is the largest patch I have ever done! OMG a few weeks of extra time.
I'm never writing a Bash script for anything that starts getting big again.

Some of the features are:

* separate build-qemu and build-gem5 commands
* common: convert scripts to python. Add --option for everything
* rename build to build-buildroot now that we are splitting all the build
  commands, Linux kernel to follow
* move all git submodules to submodules/ and all buildroot packages to
  packages/
* refactor the out/ structure. Keep projects on toplevel, because guest
  projects separate archs and host ones don't, making a toplevel arch wrong
* do-release: rename to just release
  https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it
* run: add --terminal and explain gem5 pdb
* just track the lvimrc
* store CLI kernel config fragment inside buildlroot to avoid conflicts
* gem5: document m5 initparam
* readme: make a bunch of things awesomer
* readme: fix broken refs
* parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c
  Could not fetch otherwise.
* gem5: M5_OVERRIDE_PY_SOURCE

packages/kernel_modules/user/sched_getaffinity_threads.c

@@ -0,0 +1,51 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#gdb-step-debug-multicore */
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <pthread.h>
+#include <sched.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void* main_thread_0(void *arg) {
+	int i;
+    cpu_set_t mask;
+    CPU_ZERO(&mask);
+    CPU_SET(*((int*)arg), &mask);
+    sched_setaffinity(0, sizeof(cpu_set_t), &mask);
+    i = 0;
+    while (true) {
+    	printf("0 %d\n", i);
+    	sleep(1);
+    	i++;
+    }
+    return NULL;
+}
+
+void* main_thread_1(void *arg) {
+	int i;
+    cpu_set_t mask;
+    CPU_ZERO(&mask);
+    CPU_SET(*((int*)arg), &mask);
+    sched_setaffinity(1, sizeof(cpu_set_t), &mask);
+    i = 0;
+    while (true) {
+    	printf("1 %d\n", i);
+    	sleep(1);
+    	i++;
+    }
+    return NULL;
+}
+
+int main(void) {
+    enum NUM_THREADS {NUM_THREADS = 2};
+    pthread_t threads[NUM_THREADS];
+    int thread_args[NUM_THREADS];
+	pthread_create(&threads[0], NULL, main_thread_0, (void*)&thread_args[0]);
+	pthread_create(&threads[1], NULL, main_thread_1, (void*)&thread_args[1]);
+    pthread_join(threads[0], NULL);
+    pthread_join(threads[1], NULL);
+    return EXIT_SUCCESS;
+}