Move meminfo-writer to linux-utils repo

It is common for both dom0 and VM, and also quite linux-specific
(other OSes will need other implementation). So move to linux-specific
repo (not dom0-specific).

linux/systemd/qubes-meminfo-writer.service

@@ -1,12 +0,0 @@
-[Unit]
-Description=Qubes memory information reporter
-After=qubes-core.service
-
-[Service]
-Type=simple
-ExecStart=/usr/lib/qubes/meminfo-writer 30000 100000
-StandardOutput=syslog
-RemainAfterExit=yes
-
-[Install]
-WantedBy=multi-user.target

qmemman/Makefile

@@ -1,7 +1,4 @@
-all: meminfo-writer
-
-meminfo-writer: meminfo-writer.o
-	$(CC) -g -o meminfo-writer meminfo-writer.o -lxenstore
+all:
 
 clean:
 	rm -f *.pyo 

qmemman/meminfo-writer.c

@@ -1,176 +0,0 @@
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <xs.h>
-#include <syslog.h>
-#include <string.h>
-#include <signal.h>
-
-unsigned long prev_used_mem;
-int used_mem_change_threshold;
-int delay;
-int usr1_received;
-
-char *parse(char *buf)
-{
-	char *ptr = buf;
-	char name[256];
-	static char outbuf[4096];
-	int val;
-	int len;
-	int MemTotal = 0, MemFree = 0, Buffers = 0, Cached = 0, SwapTotal =
-	    0, SwapFree = 0;
-	unsigned long long key;
-	long used_mem, used_mem_diff;
-	int nitems = 0;
-
-	while (nitems != 6) {
-		sscanf(ptr, "%s %d kB\n%n", name, &val, &len);
-		key = *(unsigned long long *) ptr;
-		if (key == *(unsigned long long *) "MemTotal:") {
-			MemTotal = val;
-			nitems++;
-		} else if (key == *(unsigned long long *) "MemFree:") {
-			MemFree = val;
-			nitems++;
-		} else if (key == *(unsigned long long *) "Buffers:") {
-			Buffers = val;
-			nitems++;
-		} else if (key == *(unsigned long long *) "Cached:  ") {
-			Cached = val;
-			nitems++;
-		} else if (key == *(unsigned long long *) "SwapTotal:") {
-			SwapTotal = val;
-			nitems++;
-		} else if (key == *(unsigned long long *) "SwapFree:") {
-			SwapFree = val;
-			nitems++;
-		}
-
-		ptr += len;
-	}
-
-	used_mem =
-	    MemTotal - Buffers - Cached - MemFree + SwapTotal - SwapFree;
-	if (used_mem < 0)
-		return NULL;
-
-	used_mem_diff = used_mem - prev_used_mem;
-	if (used_mem_diff < 0)
-		used_mem_diff = -used_mem_diff;
-	if (used_mem_diff > used_mem_change_threshold
-	    || (used_mem > prev_used_mem && used_mem * 13 / 10 > MemTotal
-		&& used_mem_diff > used_mem_change_threshold/2)) {
-		prev_used_mem = used_mem;
-		sprintf(outbuf,
-			"MemTotal: %d kB\nMemFree: %d kB\nBuffers: %d kB\nCached: %d kB\n"
-			"SwapTotal: %d kB\nSwapFree: %d kB\n", MemTotal,
-			MemFree, Buffers, Cached, SwapTotal, SwapFree);
-		return outbuf;
-	}
-	return NULL;
-}
-
-void usage()
-{
-	fprintf(stderr,
-		"usage: meminfo_writer threshold_in_kb delay_in_us [pidfile]\n");
-	fprintf(stderr, "  When pidfile set, meminfo-writer will:\n");
-    fprintf(stderr, "   - fork into background\n");
-	fprintf(stderr, "   - wait for SIGURS1 (in background) before starting main work\n");
-	exit(1);
-}
-
-void send_to_qmemman(struct xs_handle *xs, char *data)
-{
-	if (!xs_write(xs, XBT_NULL, "memory/meminfo", data, strlen(data))) {
-		syslog(LOG_DAEMON | LOG_ERR, "error writing xenstore ?");
-		exit(1);
-	}
-}
-
-void usr1_handler(int sig) {
-	usr1_received = 1;
-}
-
-int main(int argc, char **argv)
-{
-	char buf[4096];
-	int n;
-	char *meminfo_data;
-	int fd;
-	struct xs_handle *xs;
-
-	if (argc != 3 && argc != 4)
-		usage();
-	used_mem_change_threshold = atoi(argv[1]);
-	delay = atoi(argv[2]);
-	if (!used_mem_change_threshold || !delay)
-		usage();
-
-	if (argc == 4) {
-		pid_t pid;
-		sigset_t mask, oldmask;
-
-		switch (pid = fork()) {
-			case -1:
-				perror("fork");
-				exit(1);
-			case 0:
-				sigemptyset (&mask); 
-				sigaddset (&mask, SIGUSR1);
-				/* Wait for a signal to arrive. */
-				sigprocmask (SIG_BLOCK, &mask, &oldmask);
-				usr1_received = 0;
-				signal(SIGUSR1, usr1_handler);
-				while (!usr1_received)
-					  sigsuspend (&oldmask);
-				sigprocmask (SIG_UNBLOCK, &mask, NULL);
-				break;
-			default:
-				fd = open(argv[3], O_CREAT | O_TRUNC | O_WRONLY, 0666);
-				if (fd < 0) {
-					perror("open pidfile");
-					exit(1);
-				}
-				n = sprintf(buf, "%d\n", pid);
-				if (write(fd, buf, n) != n) {
-					perror("write pid");
-					exit(1);
-				}
-				close(fd);
-				exit(0);
-		}
-	}
-
-	fd = open("/proc/meminfo", O_RDONLY);
-	if (fd < 0) {
-		perror("open meminfo");
-		exit(1);
-	}
-	xs = xs_domain_open();
-	if (!xs) {
-		perror("xs_domain_open");
-		exit(1);
-	}
-	if (argc == 3) {
-		/* if not waiting for signal, fork after first info written to xenstore */
-		n = pread(fd, buf, sizeof(buf), 0);
-		buf[n] = 0;
-		meminfo_data = parse(buf);
-		if (meminfo_data)
-			send_to_qmemman(xs, meminfo_data);
-		if (fork() > 0)
-			exit(0);
-	}
-
-	for (;;) {
-		n = pread(fd, buf, sizeof(buf), 0);
-		buf[n] = 0;
-		meminfo_data = parse(buf);
-		if (meminfo_data)
-			send_to_qmemman(xs, meminfo_data);
-		usleep(delay);
-	}
-}

rpm_spec/core-dom0.spec

@@ -88,7 +88,6 @@ mkdir -p $RPM_BUILD_ROOT/usr/lib/systemd/system
 cp linux/systemd/qubes-block-cleaner.service $RPM_BUILD_ROOT%{_unitdir}
 cp linux/systemd/qubes-core.service $RPM_BUILD_ROOT%{_unitdir}
 cp linux/systemd/qubes-setupdvm.service $RPM_BUILD_ROOT%{_unitdir}
-cp linux/systemd/qubes-meminfo-writer.service $RPM_BUILD_ROOT%{_unitdir}
 cp linux/systemd/qubes-netvm.service $RPM_BUILD_ROOT%{_unitdir}
 cp linux/systemd/qubes-qmemman.service $RPM_BUILD_ROOT%{_unitdir}
 cp linux/systemd/qubes-vm@.service $RPM_BUILD_ROOT%{_unitdir}
@@ -132,7 +131,6 @@ cp linux/aux-tools/startup-dvm.sh $RPM_BUILD_ROOT/usr/lib/qubes
 cp linux/aux-tools/startup-misc.sh $RPM_BUILD_ROOT/usr/lib/qubes
 cp linux/aux-tools/prepare-volatile-img.sh $RPM_BUILD_ROOT/usr/lib/qubes
 cp qmemman/server.py $RPM_BUILD_ROOT/usr/lib/qubes/qmemman_daemon.py
-cp qmemman/meminfo-writer $RPM_BUILD_ROOT/usr/lib/qubes/
 cp qubes-rpc/qubes-notify-tools $RPM_BUILD_ROOT/usr/lib/qubes/
 cp qubes-rpc/qubes-notify-updates $RPM_BUILD_ROOT/usr/lib/qubes/
 cp linux/aux-tools/vusb-ctl.py $RPM_BUILD_ROOT/usr/lib/qubes/
@@ -287,7 +285,6 @@ fi
 /usr/lib/qubes/unbind-pci-device.sh
 /usr/lib/qubes/cleanup-dispvms
 /usr/lib/qubes/qmemman_daemon.py*
-/usr/lib/qubes/meminfo-writer
 /usr/lib/qubes/qfile-daemon-dvm*
 /usr/lib/qubes/qubes-notify-tools
 /usr/lib/qubes/qubes-notify-updates
@@ -302,7 +299,6 @@ fi
 %{_unitdir}/qubes-block-cleaner.service
 %{_unitdir}/qubes-core.service
 %{_unitdir}/qubes-setupdvm.service
-%{_unitdir}/qubes-meminfo-writer.service
 %{_unitdir}/qubes-netvm.service
 %{_unitdir}/qubes-qmemman.service
 %{_unitdir}/qubes-vm@.service