lxcfs/0012-limit-cpuinfo-by-quota-period-setting.patch

diff -uprN a/bindings.c b/bindings.c
--- a/bindings.c	2019-01-07 15:52:33.206519758 +0800
+++ b/bindings.c	2019-01-07 16:11:20.021464817 +0800
@@ -15,6 +15,7 @@
 #include <fuse.h>
 #include <inttypes.h>
 #include <libgen.h>
+#include <math.h>
 #include <pthread.h>
 #include <sched.h>
 #include <stdbool.h>
@@ -3369,6 +3370,37 @@ static bool cpuline_in_cpuset(const char
 	return cpu_in_cpuset(cpu, cpuset);
 }
 
+static long get_cpulimit(const char *cgroup, const char *file)
+{
+        char *cpulimit_str = NULL;
+        long cpulimit = -1;
+
+        if (cgfs_get_value("cpu", cgroup, file, &cpulimit_str))
+                cpulimit = strtol(cpulimit_str, NULL, 10);
+
+        free(cpulimit_str);
+
+        return cpulimit;
+}
+
+static long get_cpu_count(const char *cgroup)
+{
+	char *copy = strdupa(cgroup);
+	long double count = -1;
+	int period, quota;
+
+	period = get_cpulimit(copy, "cpu.cfs_period_us");
+	quota = get_cpulimit(copy, "cpu.cfs_quota_us");
+
+	if (quota != -1)
+		count = quota / period;
+
+	if (quota > 0) {
+		return ceil(count);
+	}
+
+	return -1;
+}
 /*
  * check whether this is a '^processor" line in /proc/cpuinfo
  */
@@ -3387,11 +3419,13 @@ static int proc_cpuinfo_read(char *buf,
 	struct fuse_context *fc = fuse_get_context();
 	struct file_info *d = (struct file_info *)fi->fh;
 	char *cg = NULL;
+	char *ccg = NULL;
 	char *cpuset = NULL;
 	char *line = NULL;
 	size_t linelen = 0, total_len = 0, rv = 0;
 	bool am_printing = false, firstline = true, is_s390x = false;
 	int curcpu = -1, cpu;
+	long total_cpus = -1;
 	char *cache = d->buf;
 	size_t cache_size = d->buflen;
 	FILE *f = NULL;
@@ -3419,6 +3453,12 @@ static int proc_cpuinfo_read(char *buf,
 	if (!cpuset)
 		goto err;
 
+	ccg = get_pid_cgroup(initpid, "cpu");
+	if (ccg) {
+		prune_init_slice(ccg);
+		total_cpus = get_cpu_count(ccg);
+	}
+
 	f = fopen("/proc/cpuinfo", "r");
 	if (!f)
 		goto err;
@@ -3436,6 +3476,9 @@ static int proc_cpuinfo_read(char *buf,
 		if (strncmp(line, "# processors:", 12) == 0)
 			continue;
 		if (is_processor_line(line)) {
+			if (total_cpus > 0 && curcpu >= (total_cpus-1)) {
+				break;
+			}
 			am_printing = cpuline_in_cpuset(line, cpuset);
 			if (am_printing) {
 				curcpu ++;
@@ -3457,6 +3500,10 @@ static int proc_cpuinfo_read(char *buf,
 			continue;
 		} else if (is_s390x && sscanf(line, "processor %d:", &cpu) == 1) {
 			char *p = NULL;
+
+			if (total_cpus > 0 && curcpu >= (total_cpus-1)) {
+				break;
+			}
 			if (!cpu_in_cpuset(cpu, cpuset))
 				continue;
 			curcpu ++;
@@ -3509,7 +3556,7 @@ static int proc_cpuinfo_read(char *buf,
 		}
 	}
 
-	if (is_s390x) {
+	if ((is_s390x) && ((total_cpus < 0) || (total_cpus > 0 && curcpu < (total_cpus-1)))) {
 		char *origcache = d->buf;
 		ssize_t l;
 		do {
diff -uprN a/Makefile.am b/Makefile.am
--- a/Makefile.am	2019-01-07 15:52:33.211519758 +0800
+++ b/Makefile.am	2019-01-07 16:09:21.713470585 +0800
@@ -13,7 +13,7 @@ AM_CFLAGS += -DRUNTIME_PATH=\"$(RUNTIME_
 
 liblxcfs_la_SOURCES = macro.h bindings.c cpuset.c bindings.h
 liblxcfs_la_CFLAGS = $(AM_CFLAGS)
-liblxcfs_la_LDFLAGS = $(AM_CFLAGS) -module -avoid-version -shared
+liblxcfs_la_LDFLAGS = $(AM_CFLAGS) -module -avoid-version -shared -lm
 
 liblxcfstest_la_SOURCES = bindings.c cpuset.c bindings.h macro.h
 liblxcfstest_la_CFLAGS = $(AM_CFLAGS) -DRELOADTEST
diff -uprN a/Makefile.in b/Makefile.in
--- a/Makefile.in	2019-01-07 15:52:33.204519758 +0800
+++ b/Makefile.in	2019-01-07 16:09:21.714470585 +0800
@@ -427,7 +427,7 @@ AM_CFLAGS = -Wall -ggdb -D_GNU_SOURCE -D
 AM_LDFLAGS = $(FUSE_LIBS) -pthread
 liblxcfs_la_SOURCES = macro.h bindings.c cpuset.c bindings.h
 liblxcfs_la_CFLAGS = $(AM_CFLAGS)
-liblxcfs_la_LDFLAGS = $(AM_CFLAGS) -module -avoid-version -shared
+liblxcfs_la_LDFLAGS = $(AM_CFLAGS) -module -avoid-version -shared -lm
 liblxcfstest_la_SOURCES = bindings.c cpuset.c bindings.h macro.h
 liblxcfstest_la_CFLAGS = $(AM_CFLAGS) -DRELOADTEST
 liblxcfstest_la_LDFLAGS = $(AM_CFLAGS) -module -avoid-version -shared