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[RHEL8][CONTAINER] Runtime check when creating pThreads

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It looks like :
  - when running on a Fedora-host
  - with generic kernel
  - in a container
  - even in privileged mode

That is not enough and priority/schedule settings is not allowed.

So at runtime, we check and in case, we don't set up priorities.

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>
This commit is contained in:
Raphael Defosseux
2021-05-25 14:41:30 +02:00
parent c19ba39eaa
commit aa6b36a60f
4 changed files with 125 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files
common/utils/system.c
+70 -16
View File
@@ -96,6 +96,51 @@ static void read_pipe(int p, char *b, int size) {
}
}
static int baseRunTimeCommand(char* cmd) {
FILE *fp;
size_t retSize = 0;
fp = popen(cmd, "r");
memset(cmd, 1, 200);
retSize = fread(cmd, 1, 200, fp);
fclose(fp);
if (retSize == 0) {
return 0;
}
return atoi(cmd);
}
int checkIfFedoraDistribution(void) {
char cmd[200];
memset(cmd, 1, 200);
sprintf(cmd, "cat /etc/os-release | grep ID_LIKE | grep -ic fedora || true");
return baseRunTimeCommand(cmd);
}
int checkIfGenericKernelOnFedora(void) {
char cmd[200];
memset(cmd, 1, 200);
sprintf(cmd, "uname -a | grep -c rt || true");
return (1 - baseRunTimeCommand(cmd));
}
int checkIfInsideContainer(void) {
char cmd[200];
int res = 0;
memset(cmd, 1, 200);
sprintf(cmd, "cat /proc/self/cgroup | egrep -c 'libpod|podman|kubepods' || true");
res = baseRunTimeCommand(cmd);
if (res > 0)
return 1;
else
return 0;
}
/********************************************************************/
/* background process */
/********************************************************************/
@@ -200,29 +245,38 @@ void start_background_system(void) {
void threadCreate(pthread_t* t, void * (*func)(void*), void * param, char* name, int affinity, int priority){
pthread_attr_t attr;
int ret;
int settingPriority = 1;
ret=pthread_attr_init(&attr);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
ret=pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
ret=pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
ret=pthread_attr_setschedpolicy(&attr, SCHED_OAI);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
if(priority<sched_get_priority_min(SCHED_OAI) || priority>sched_get_priority_max(SCHED_FIFO)) {
LOG_E(TMR,"Prio not possible: %d, min is %d, max: %d, forced in the range\n",
priority,
sched_get_priority_min(SCHED_OAI),
sched_get_priority_max(SCHED_OAI));
if(priority<sched_get_priority_min(SCHED_OAI))
priority=sched_get_priority_min(SCHED_OAI);
if(priority>sched_get_priority_max(SCHED_OAI))
priority=sched_get_priority_max(SCHED_OAI);
if (checkIfFedoraDistribution())
if (checkIfGenericKernelOnFedora())
if (checkIfInsideContainer())
settingPriority = 0;
if (settingPriority) {
ret=pthread_attr_setschedpolicy(&attr, SCHED_OAI);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
if(priority<sched_get_priority_min(SCHED_OAI) || priority>sched_get_priority_max(SCHED_FIFO)) {
LOG_E(TMR,"Prio not possible: %d, min is %d, max: %d, forced in the range\n",
priority,
sched_get_priority_min(SCHED_OAI),
sched_get_priority_max(SCHED_OAI));
if(priority<sched_get_priority_min(SCHED_OAI))
priority=sched_get_priority_min(SCHED_OAI);
if(priority>sched_get_priority_max(SCHED_OAI))
priority=sched_get_priority_max(SCHED_OAI);
}
AssertFatal(priority<=sched_get_priority_max(SCHED_OAI),"");
struct sched_param sparam={0};
sparam.sched_priority = priority;
ret=pthread_attr_setschedparam(&attr, &sparam);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
}
AssertFatal(priority<=sched_get_priority_max(SCHED_OAI),"");
struct sched_param sparam={0};
sparam.sched_priority = priority;
ret=pthread_attr_setschedparam(&attr, &sparam);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
ret=pthread_create(t, &attr, func, param);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);