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mcexec: --disable-sched-yield: avoid kernel/user switch

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This commit is contained in:
Balazs Gerofi
2017-03-05 14:36:56 +09:00
parent a256280118
commit e554f4e2f9
6 changed files with 89 additions and 5 deletions
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35
executer/user/mcexec.c
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@ -152,6 +152,7 @@ static int fd;
static char *exec_path = NULL;
static char *altroot;
static const char rlimit_stack_envname[] = "MCKERNEL_RLIMIT_STACK";
static const char ld_preload_envname[] = "MCKERNEL_LD_PRELOAD";
static int ischild;
static int enable_vdso = 1;
static int mpol_no_heap = 0;
@ -160,6 +161,7 @@ static int mpol_no_bss = 0;
static int no_bind_ikc_map = 0;
static unsigned long mpol_threshold = 0;
static int profile = 0;
static int disable_sched_yield = 0;
/* Partitioned execution (e.g., for MPI) */
static int nr_processes = 0;
@ -1321,6 +1323,12 @@ static struct option mcexec_options[] = {
.flag = NULL,
.val = 'm',
},
{
.name = "disable-sched-yield",
.has_arg = no_argument,
.flag = &disable_sched_yield,
.val = 1,
},
/* end */
{ NULL, 0, NULL, 0, },
};
@ -1361,10 +1369,6 @@ int main(int argc, char **argv)
altroot = "/usr/linux-k1om-4.7/linux-k1om";
}
/* Collect environment variables */
envs_len = flatten_strings(-1, NULL, environ, &envs);
envs = envs;
rlim_stack.rlim_cur = MCEXEC_DEF_CUR_STACK_SIZE;
rlim_stack.rlim_max = MCEXEC_DEF_MAX_STACK_SIZE;
@ -1436,6 +1440,29 @@ int main(int argc, char **argv)
return 1;
}
if (disable_sched_yield) {
char sched_yield_lib_path[PATH_MAX];
sprintf(sched_yield_lib_path, "%s/libsched_yield.so.1.0.0",
MCKERNEL_LIBDIR);
__dprintf("%s: %s\n", __FUNCTION__, sched_yield_lib_path);
if (setenv("LD_PRELOAD", sched_yield_lib_path, 1) < 0) {
printf("%s: warning: failed to set LD_PRELOAD for sched_yield\n",
__FUNCTION__);
}
}
/* Set LD_PRELOAD to McKernel specific value */
else if (getenv(ld_preload_envname)) {
if (setenv("LD_PRELOAD", getenv(ld_preload_envname), 1) < 0) {
printf("%s: warning: failed to set LD_PRELOAD environment variable\n",
__FUNCTION__);
}
unsetenv(ld_preload_envname);
}
/* Collect environment variables */
envs_len = flatten_strings(-1, NULL, environ, &envs);
envs = envs;
#ifdef ENABLE_MCOVERLAYFS
__dprintf("mcoverlay enable\n");
char mcos_procdir[PATH_MAX];