QubesOS/qubes-linux-utils
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Merge remote-tracking branch 'origin/pr/1'

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* origin/pr/1:
  use 64-bit integers for memory sizes to support > 2 TB RAM
  Report Xen balloon current size instead of Linux total memory

Fixes QubesOS/qubes-issues#1136
This commit is contained in:
Marek Marczykowski-Górecki 2015-10-10 02:53:23 +02:00
commit c9335ddc5c
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GPG Key ID: 063938BA42CFA724
1 changed files with 69 additions and 33 deletions
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102
qmemman/meminfo-writer.c
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@ -16,21 +16,21 @@ int used_mem_change_threshold;
int delay;
int usr1_received;
const char *parse(const char *buf)
const char *parse(const char *meminfo_buf, const char* dom_current_buf)
{
const char *ptr = buf;
const char *ptr = meminfo_buf;
static char outbuf[4096];
int val;
long long val;
int len;
int ret;
int MemTotal = 0, MemFree = 0, Buffers = 0, Cached = 0, SwapTotal =
long long MemTotal = 0, MemFree = 0, Buffers = 0, Cached = 0, SwapTotal =
0, SwapFree = 0;
unsigned long long key;
long used_mem, used_mem_diff;
long long used_mem, used_mem_diff;
int nitems = 0;
while (nitems != (1<<6)-1 || !*ptr) {
ret = sscanf(ptr, "%*s %d kB\n%n", &val, &len);
ret = sscanf(ptr, "%*s %lld kB\n%n", &val, &len);
if (ret < 1 || len < (int)sizeof (unsigned long long)) {
ptr += len;
continue;
@ -59,6 +59,12 @@ const char *parse(const char *buf)
ptr += len;
}
if(dom_current_buf) {
long long DomTotal = strtoll(dom_current_buf, 0, 10);
if(DomTotal)
MemTotal = DomTotal;
}
used_mem =
MemTotal - Buffers - Cached - MemFree + SwapTotal - SwapFree;
if (used_mem < 0)
@ -73,8 +79,8 @@ const char *parse(const char *buf)
&& 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,
"MemTotal: %lld kB\nMemFree: %lld kB\nBuffers: %lld kB\nCached: %lld kB\n"
"SwapTotal: %lld kB\nSwapFree: %lld kB\n", MemTotal,
MemFree, Buffers, Cached, SwapTotal, SwapFree);
return outbuf;
}
@ -103,13 +109,50 @@ void usr1_handler(int sig __attribute__((__unused__))) {
usr1_received = 1;
}
static inline void pread0_string(int fd, char* buf, size_t buf_size)
{
int n = pread(fd, buf, buf_size - 1, 0);
if (n < 0) {
perror("pread");
exit(1);
}
buf[n] = 0;
}
static void update(struct xs_handle *xs, int meminfo_fd, int dom_current_fd)
{
char dom_current_buf[32];
char dom_current_buf2[32];
char meminfo_buf[4096];
const char *meminfo_data;
pread0_string(dom_current_fd, dom_current_buf, sizeof(dom_current_buf));
/* check until the dom current reading is stable to avoid races */
for(;;) {
pread0_string(meminfo_fd, meminfo_buf, sizeof(meminfo_buf));
pread0_string(dom_current_fd, dom_current_buf2, sizeof(dom_current_buf2));
if(!strcmp(dom_current_buf, dom_current_buf2))
break;
pread0_string(meminfo_fd, meminfo_buf, sizeof(meminfo_buf));
pread0_string(dom_current_fd, dom_current_buf, sizeof(dom_current_buf));
if(!strcmp(dom_current_buf, dom_current_buf2))
break;
}
meminfo_data = parse(meminfo_buf, dom_current_buf);
if (meminfo_data)
send_to_qmemman(xs, meminfo_data);
}
int main(int argc, char **argv)
{
char buf[4096];
int n;
const char *meminfo_data;
int fd;
int meminfo_fd, dom_current_fd;
struct xs_handle *xs;
int n;
if (argc != 3 && argc != 4)
usage();
@ -121,6 +164,8 @@ int main(int argc, char **argv)
if (argc == 4) {
pid_t pid;
sigset_t mask, oldmask;
int fd;
char buf[32];
switch (pid = fork()) {
case -1:
@ -155,9 +200,14 @@ int main(int argc, char **argv)
}
}
fd = open("/proc/meminfo", O_RDONLY);
if (fd < 0) {
perror("open meminfo");
meminfo_fd = open("/proc/meminfo", O_RDONLY);
if (meminfo_fd < 0) {
perror("open /proc/meminfo");
exit(1);
}
dom_current_fd = open("/sys/devices/system/xen_memory/xen_memory0/info/current_kb", O_RDONLY);
if (dom_current_fd < 0) {
perror("open /sys/devices/system/xen_memory/xen_memory0/info/current_kb");
exit(1);
}
xs = xs_domain_open();
@ -167,15 +217,8 @@ int main(int argc, char **argv)
}
if (argc == 3) {
/* if not waiting for signal, fork after first info written to xenstore */
n = pread(fd, buf, sizeof(buf)-1, 0);
if (n < 0) {
perror("pread");
exit(1);
}
buf[n] = 0;
meminfo_data = parse(buf);
if (meminfo_data)
send_to_qmemman(xs, meminfo_data);
update(xs, meminfo_fd, dom_current_fd);
n = fork();
if (n < 0) {
perror("fork");
@ -187,15 +230,8 @@ int main(int argc, char **argv)
}
for (;;) {
n = pread(fd, buf, sizeof(buf)-1, 0);
if (n < 0) {
perror("pread");
exit(1);
}
buf[n] = 0;
meminfo_data = parse(buf);
if (meminfo_data)
send_to_qmemman(xs, meminfo_data);
update(xs, meminfo_fd, dom_current_fd);
usleep(delay);
}
}