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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#define _GNU_SOURCE#ifdef HAVE_LIBCPUPOWER_SUPPORT#include <cpuidle.h>#endif /* HAVE_LIBCPUPOWER_SUPPORT */#include <dirent.h>#include <stdarg.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <ctype.h>#include <errno.h>#include <fcntl.h>#include <sched.h>#include <stdio.h>#include <limits.h>
#include "common.h"
#define MAX_MSG_LENGTH 1024bool config_debug;
/* * err_msg - print an error message to the stderr */void err_msg(const char *fmt, ...){ char message[MAX_MSG_LENGTH]; va_list ap;
va_start(ap, fmt); vsnprintf(message, sizeof(message), fmt, ap); va_end(ap);
fprintf(stderr, "%s", message);}
/* * debug_msg - print a debug message to stderr if debug is set */void debug_msg(const char *fmt, ...){ char message[MAX_MSG_LENGTH]; va_list ap;
if (!config_debug) return;
va_start(ap, fmt); vsnprintf(message, sizeof(message), fmt, ap); va_end(ap);
fprintf(stderr, "%s", message);}
/* * fatal - print an error message and EOL to stderr and exit with ERROR */void fatal(const char *fmt, ...){ va_list ap;
va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fprintf(stderr, "\n");
exit(ERROR);}
/* * get_llong_from_str - get a long long int from a string */long long get_llong_from_str(char *start){ long long value; char *end;
errno = 0; value = strtoll(start, &end, 10); if (errno || start == end) return -1;
return value;}
/* * get_duration - fill output with a human readable duration since start_time */void get_duration(time_t start_time, char *output, int output_size){ time_t now = time(NULL); struct tm *tm_info; time_t duration;
duration = difftime(now, start_time); tm_info = gmtime(&duration);
snprintf(output, output_size, "%3d %02d:%02d:%02d", tm_info->tm_yday, tm_info->tm_hour, tm_info->tm_min, tm_info->tm_sec);}
/* * parse_cpu_set - parse a cpu_list filling cpu_set_t argument * * Receives a cpu list, like 1-3,5 (cpus 1, 2, 3, 5), and then set * filling cpu_set_t argument. * * Returns 0 on success, 1 otherwise. */int parse_cpu_set(char *cpu_list, cpu_set_t *set){ const char *p; int end_cpu; int cpu; int i;
CPU_ZERO(set);
for (p = cpu_list; *p; ) { cpu = atoi(p); if (cpu < 0 || (!cpu && *p != '0') || cpu >= nr_cpus) goto err;
while (isdigit(*p)) p++; if (*p == '-') { p++; end_cpu = atoi(p); if (end_cpu < cpu || (!end_cpu && *p != '0') || end_cpu >= nr_cpus) goto err; while (isdigit(*p)) p++; } else end_cpu = cpu;
if (cpu == end_cpu) { debug_msg("cpu_set: adding cpu %d\n", cpu); CPU_SET(cpu, set); } else { for (i = cpu; i <= end_cpu; i++) { debug_msg("cpu_set: adding cpu %d\n", i); CPU_SET(i, set); } }
if (*p == ',') p++; }
return 0;err: debug_msg("Error parsing the cpu set %s\n", cpu_list); return 1;}
/* * parse_stack_format - parse the stack format * * Return: the stack format on success, -1 otherwise. */int parse_stack_format(char *arg){ if (!strcmp(arg, "truncate")) return STACK_FORMAT_TRUNCATE; if (!strcmp(arg, "skip")) return STACK_FORMAT_SKIP; if (!strcmp(arg, "full")) return STACK_FORMAT_FULL;
debug_msg("Error parsing the stack format %s\n", arg); return -1;}
/* * parse_duration - parse duration with s/m/h/d suffix converting it to seconds */long parse_seconds_duration(char *val){ char *end; long t;
t = strtol(val, &end, 10);
if (end) { switch (*end) { case 's': case 'S': break; case 'm': case 'M': t *= 60; break; case 'h': case 'H': t *= 60 * 60; break;
case 'd': case 'D': t *= 24 * 60 * 60; break; } }
return t;}
/* * match_time_unit - check if str starts with unit followed by end-of-string or ':' * * This allows the time unit parser to work both in standalone duration strings * like "100ms" and in colon-delimited SCHED_DEADLINE specifications like * "d:10ms:100ms", while still rejecting malformed input like "100msx". */static bool match_time_unit(const char *str, const char *unit){ size_t len = strlen(unit);
return strncmp(str, unit, len) == 0 && (str[len] == '\0' || str[len] == ':');}
/* * parse_ns_duration - parse duration with ns/us/ms/s converting it to nanoseconds */long parse_ns_duration(char *val){ char *end; long t;
t = strtol(val, &end, 10);
if (end) { if (match_time_unit(end, "ns")) { return t; } else if (match_time_unit(end, "us")) { t *= 1000; return t; } else if (match_time_unit(end, "ms")) { t *= 1000 * 1000; return t; } else if (match_time_unit(end, "s")) { t *= 1000 * 1000 * 1000; return t; } return -1; }
return t;}
/* * This is a set of helper functions to use SCHED_DEADLINE. */#ifndef __NR_sched_setattr# ifdef __x86_64__# define __NR_sched_setattr 314# elif __i386__# define __NR_sched_setattr 351# elif __arm__# define __NR_sched_setattr 380# elif __aarch64__ || __riscv# define __NR_sched_setattr 274# elif __powerpc__# define __NR_sched_setattr 355# elif __s390x__# define __NR_sched_setattr 345# elif __loongarch__# define __NR_sched_setattr 274# endif#endif
#define SCHED_DEADLINE 6
static inline int syscall_sched_setattr(pid_t pid, const struct sched_attr *attr, unsigned int flags) { return syscall(__NR_sched_setattr, pid, attr, flags);}
int __set_sched_attr(int pid, struct sched_attr *attr){ int flags = 0; int retval;
retval = syscall_sched_setattr(pid, attr, flags); if (retval < 0) { err_msg("Failed to set sched attributes to the pid %d: %s\n", pid, strerror(errno)); return 1; }
return 0;}
/* * procfs_is_workload_pid - check if a procfs entry contains a comm_prefix* comm * * Check if the procfs entry is a directory of a process, and then check if the * process has a comm with the prefix set in char *comm_prefix. As the * current users of this function only check for kernel threads, there is no * need to check for the threads for the process. * * Return: True if the proc_entry contains a comm file with comm_prefix*. * Otherwise returns false. */static int procfs_is_workload_pid(const char *comm_prefix, struct dirent *proc_entry){ char buffer[MAX_PATH]; int comm_fd, retval; char *t_name;
if (proc_entry->d_type != DT_DIR) return 0;
if (*proc_entry->d_name == '.') return 0;
/* check if the string is a pid */ for (t_name = proc_entry->d_name; *t_name; t_name++) { if (!isdigit(*t_name)) break; }
if (*t_name != '\0') return 0;
snprintf(buffer, MAX_PATH, "/proc/%s/comm", proc_entry->d_name); comm_fd = open(buffer, O_RDONLY); if (comm_fd < 0) return 0;
memset(buffer, 0, MAX_PATH); retval = read(comm_fd, buffer, MAX_PATH);
close(comm_fd);
if (retval <= 0) return 0;
buffer[MAX_PATH-1] = '\0'; if (!str_has_prefix(buffer, comm_prefix)) return 0;
/* comm already have \n */ debug_msg("Found workload pid:%s comm:%s", proc_entry->d_name, buffer);
return 1;}
/* * set_comm_sched_attr - set sched params to threads starting with char *comm_prefix * * This function uses procfs to list the currently running threads and then set the * sched_attr *attr to the threads that start with char *comm_prefix. It is * mainly used to set the priority to the kernel threads created by the * tracers. */int set_comm_sched_attr(const char *comm_prefix, struct sched_attr *attr){ struct dirent *proc_entry; DIR *procfs; int retval; int pid;
if (strlen(comm_prefix) >= MAX_PATH) { err_msg("Command prefix is too long: %d < strlen(%s)\n", MAX_PATH, comm_prefix); return 1; }
procfs = opendir("/proc"); if (!procfs) { err_msg("Could not open procfs\n"); return 1; }
while ((proc_entry = readdir(procfs))) {
retval = procfs_is_workload_pid(comm_prefix, proc_entry); if (!retval) continue;
if (strtoi(proc_entry->d_name, &pid)) { err_msg("'%s' is not a valid pid", proc_entry->d_name); retval = 1; goto out; } /* procfs_is_workload_pid confirmed it is a pid */ retval = __set_sched_attr(pid, attr); if (retval) { err_msg("Error setting sched attributes for pid:%s\n", proc_entry->d_name); goto out; }
debug_msg("Set sched attributes for pid:%s\n", proc_entry->d_name); }
retval = 0;out: closedir(procfs); return retval;}
#define INVALID_VAL (~0L)static long get_long_ns_after_colon(char *start){ long val = INVALID_VAL;
/* find the ":" */ start = strstr(start, ":"); if (!start) return -1;
/* skip ":" */ start++; val = parse_ns_duration(start);
return val;}
static long get_long_after_colon(char *start){ long val = INVALID_VAL;
/* find the ":" */ start = strstr(start, ":"); if (!start) return -1;
/* skip ":" */ start++; val = get_llong_from_str(start);
return val;}
/* * parse priority in the format: * SCHED_OTHER: * o:<prio> * O:<prio> * SCHED_RR: * r:<prio> * R:<prio> * SCHED_FIFO: * f:<prio> * F:<prio> * SCHED_DEADLINE: * d:runtime:period * D:runtime:period */int parse_prio(char *arg, struct sched_attr *sched_param){ long prio; long runtime; long period;
memset(sched_param, 0, sizeof(*sched_param)); sched_param->size = sizeof(*sched_param);
switch (arg[0]) { case 'd': case 'D': /* d:runtime:period */ if (strlen(arg) < 4) return -1;
runtime = get_long_ns_after_colon(arg); if (runtime == INVALID_VAL) return -1;
period = get_long_ns_after_colon(&arg[2]); if (period == INVALID_VAL) return -1;
if (runtime > period) return -1;
sched_param->sched_policy = SCHED_DEADLINE; sched_param->sched_runtime = runtime; sched_param->sched_deadline = period; sched_param->sched_period = period; break; case 'f': case 'F': /* f:prio */ prio = get_long_after_colon(arg); if (prio == INVALID_VAL) return -1;
if (prio < sched_get_priority_min(SCHED_FIFO)) return -1; if (prio > sched_get_priority_max(SCHED_FIFO)) return -1;
sched_param->sched_policy = SCHED_FIFO; sched_param->sched_priority = prio; break; case 'r': case 'R': /* r:prio */ prio = get_long_after_colon(arg); if (prio == INVALID_VAL) return -1;
if (prio < sched_get_priority_min(SCHED_RR)) return -1; if (prio > sched_get_priority_max(SCHED_RR)) return -1;
sched_param->sched_policy = SCHED_RR; sched_param->sched_priority = prio; break; case 'o': case 'O': /* o:prio */ prio = get_long_after_colon(arg); if (prio == INVALID_VAL) return -1;
if (prio < MIN_NICE) return -1; if (prio > MAX_NICE) return -1;
sched_param->sched_policy = SCHED_OTHER; sched_param->sched_nice = prio; break; default: return -1; } return 0;}
/* * set_cpu_dma_latency - set the /dev/cpu_dma_latecy * * This is used to reduce the exit from idle latency. The value * will be reset once the file descriptor of /dev/cpu_dma_latecy * is closed. * * Return: the /dev/cpu_dma_latecy file descriptor */int set_cpu_dma_latency(int32_t latency){ int retval; int fd;
fd = open("/dev/cpu_dma_latency", O_RDWR); if (fd < 0) { err_msg("Error opening /dev/cpu_dma_latency\n"); return -1; }
retval = write(fd, &latency, 4); if (retval < 1) { err_msg("Error setting /dev/cpu_dma_latency\n"); close(fd); return -1; }
debug_msg("Set /dev/cpu_dma_latency to %d\n", latency);
return fd;}
#ifdef HAVE_LIBCPUPOWER_SUPPORTstatic unsigned int **saved_cpu_idle_disable_state;static size_t saved_cpu_idle_disable_state_alloc_ctr;
/* * save_cpu_idle_state_disable - save disable for all idle states of a cpu * * Saves the current disable of all idle states of a cpu, to be subsequently * restored via restore_cpu_idle_disable_state. * * Return: idle state count on success, negative on error */int save_cpu_idle_disable_state(unsigned int cpu){ unsigned int nr_states; unsigned int state; int disabled;
nr_states = cpuidle_state_count(cpu);
if (nr_states == 0) return 0;
if (saved_cpu_idle_disable_state == NULL) { saved_cpu_idle_disable_state = calloc(nr_cpus, sizeof(unsigned int *)); if (!saved_cpu_idle_disable_state) return -1; }
saved_cpu_idle_disable_state[cpu] = calloc(nr_states, sizeof(unsigned int)); if (!saved_cpu_idle_disable_state[cpu]) return -1; saved_cpu_idle_disable_state_alloc_ctr++;
for (state = 0; state < nr_states; state++) { disabled = cpuidle_is_state_disabled(cpu, state); if (disabled < 0) return disabled; saved_cpu_idle_disable_state[cpu][state] = disabled; }
return nr_states;}
/* * restore_cpu_idle_disable_state - restore disable for all idle states of a cpu * * Restores the current disable state of all idle states of a cpu that was * previously saved by save_cpu_idle_disable_state. * * Return: idle state count on success, negative on error */int restore_cpu_idle_disable_state(unsigned int cpu){ unsigned int nr_states; unsigned int state; int disabled; int result;
nr_states = cpuidle_state_count(cpu);
if (nr_states == 0) return 0;
if (!saved_cpu_idle_disable_state) return -1;
for (state = 0; state < nr_states; state++) { if (!saved_cpu_idle_disable_state[cpu]) return -1; disabled = saved_cpu_idle_disable_state[cpu][state]; result = cpuidle_state_disable(cpu, state, disabled); if (result < 0) return result; }
free(saved_cpu_idle_disable_state[cpu]); saved_cpu_idle_disable_state[cpu] = NULL; saved_cpu_idle_disable_state_alloc_ctr--; if (saved_cpu_idle_disable_state_alloc_ctr == 0) { free(saved_cpu_idle_disable_state); saved_cpu_idle_disable_state = NULL; }
return nr_states;}
/* * free_cpu_idle_disable_states - free saved idle state disable for all cpus * * Frees the memory used for storing cpu idle state disable for all cpus * and states. * * Normally, the memory is freed automatically in * restore_cpu_idle_disable_state; this is mostly for cleaning up after an * error. */void free_cpu_idle_disable_states(void){ int cpu;
if (!saved_cpu_idle_disable_state) return;
for (cpu = 0; cpu < nr_cpus; cpu++) { free(saved_cpu_idle_disable_state[cpu]); saved_cpu_idle_disable_state[cpu] = NULL; }
free(saved_cpu_idle_disable_state); saved_cpu_idle_disable_state = NULL;}
/* * set_deepest_cpu_idle_state - limit idle state of cpu * * Disables all idle states deeper than the one given in * deepest_state (assuming states with higher number are deeper). * * This is used to reduce the exit from idle latency. Unlike * set_cpu_dma_latency, it can disable idle states per cpu. * * Return: idle state count on success, negative on error */int set_deepest_cpu_idle_state(unsigned int cpu, unsigned int deepest_state){ unsigned int nr_states; unsigned int state; int result;
nr_states = cpuidle_state_count(cpu);
for (state = deepest_state + 1; state < nr_states; state++) { result = cpuidle_state_disable(cpu, state, 1); if (result < 0) return result; }
return nr_states;}#endif /* HAVE_LIBCPUPOWER_SUPPORT */
#define _STR(x) #x#define STR(x) _STR(x)
/* * find_mount - find a the mount point of a given fs * * Returns 0 if mount is not found, otherwise return 1 and fill mp * with the mount point. */static const int find_mount(const char *fs, char *mp, int sizeof_mp){ char mount_point[MAX_PATH+1]; char type[100]; int found = 0; FILE *fp;
fp = fopen("/proc/mounts", "r"); if (!fp) return 0;
while (fscanf(fp, "%*s %" STR(MAX_PATH) "s %99s %*s %*d %*d\n", mount_point, type) == 2) { if (strcmp(type, fs) == 0) { found = 1; break; } } fclose(fp);
if (!found) return 0;
memset(mp, 0, sizeof_mp); strncpy(mp, mount_point, sizeof_mp - 1);
debug_msg("Fs %s found at %s\n", fs, mp); return 1;}
/* * get_self_cgroup - get the current thread cgroup path * * Parse /proc/$$/cgroup file to get the thread's cgroup. As an example of line to parse: * * 0::/user.slice/user-0.slice/session-3.scope'\n' * * This function is interested in the content after the second : and before the '\n'. * * Returns 1 if a string was found, 0 otherwise. */static int get_self_cgroup(char *self_cg, int sizeof_self_cg){ char path[MAX_PATH], *start; int fd, retval;
snprintf(path, MAX_PATH, "/proc/%d/cgroup", getpid());
fd = open(path, O_RDONLY); if (fd < 0) return 0;
memset(path, 0, sizeof(path)); retval = read(fd, path, MAX_PATH);
close(fd);
if (retval <= 0) return 0;
path[MAX_PATH-1] = '\0'; start = path;
start = strstr(start, ":"); if (!start) return 0;
/* skip ":" */ start++;
start = strstr(start, ":"); if (!start) return 0;
/* skip ":" */ start++;
if (strlen(start) >= sizeof_self_cg) return 0;
snprintf(self_cg, sizeof_self_cg, "%s", start);
/* Swap '\n' with '\0' */ start = strstr(self_cg, "\n");
/* there must be '\n' */ if (!start) return 0;
/* ok, it found a string after the second : and before the \n */ *start = '\0';
return 1;}
/* * open_cgroup_procs - Open the cgroup.procs file for the given cgroup * * If cgroup argument is not NULL, the cgroup.procs file for that cgroup * will be opened. Otherwise, the cgroup of the calling, i.e., rtla, thread * will be used. * * Supports cgroup v2. * * Returns the file descriptor on success, -1 otherwise. */static int open_cgroup_procs(const char *cgroup){ char cgroup_path[MAX_PATH - strlen("/cgroup.procs")]; char cgroup_procs[MAX_PATH]; int retval; int cg_fd; size_t cg_path_len;
retval = find_mount("cgroup2", cgroup_path, sizeof(cgroup_path)); if (!retval) { err_msg("Did not find cgroupv2 mount point\n"); return -1; }
cg_path_len = strlen(cgroup_path);
if (!cgroup) { retval = get_self_cgroup(&cgroup_path[cg_path_len], sizeof(cgroup_path) - cg_path_len); if (!retval) { err_msg("Did not find self cgroup\n"); return -1; } } else { snprintf(&cgroup_path[cg_path_len], sizeof(cgroup_path) - cg_path_len, "%s/", cgroup); }
snprintf(cgroup_procs, MAX_PATH, "%s/cgroup.procs", cgroup_path);
debug_msg("Using cgroup path at: %s\n", cgroup_procs);
cg_fd = open(cgroup_procs, O_RDWR); if (cg_fd < 0) return -1;
return cg_fd;}
/* * set_pid_cgroup - Set cgroup to pid_t pid * * If cgroup argument is not NULL, the threads will move to the given cgroup. * Otherwise, the cgroup of the calling, i.e., rtla, thread will be used. * * Supports cgroup v2. * * Returns 1 on success, 0 otherwise. */int set_pid_cgroup(pid_t pid, const char *cgroup){ char pid_str[24]; int retval; int cg_fd;
cg_fd = open_cgroup_procs(cgroup); if (cg_fd < 0) return 0;
snprintf(pid_str, sizeof(pid_str), "%d\n", pid);
retval = write(cg_fd, pid_str, strlen(pid_str)); if (retval < 0) err_msg("Error setting cgroup attributes for pid:%s - %s\n", pid_str, strerror(errno)); else debug_msg("Set cgroup attributes for pid:%s\n", pid_str);
close(cg_fd);
return (retval >= 0);}
/** * set_comm_cgroup - Set cgroup to threads starting with char *comm_prefix * * If cgroup argument is not NULL, the threads will move to the given cgroup. * Otherwise, the cgroup of the calling, i.e., rtla, thread will be used. * * Supports cgroup v2. * * Returns 1 on success, 0 otherwise. */int set_comm_cgroup(const char *comm_prefix, const char *cgroup){ struct dirent *proc_entry; DIR *procfs; int retval; int cg_fd;
if (strlen(comm_prefix) >= MAX_PATH) { err_msg("Command prefix is too long: %d < strlen(%s)\n", MAX_PATH, comm_prefix); return 0; }
cg_fd = open_cgroup_procs(cgroup); if (cg_fd < 0) return 0;
procfs = opendir("/proc"); if (!procfs) { err_msg("Could not open procfs\n"); goto out_cg; }
while ((proc_entry = readdir(procfs))) {
retval = procfs_is_workload_pid(comm_prefix, proc_entry); if (!retval) continue;
retval = write(cg_fd, proc_entry->d_name, strlen(proc_entry->d_name)); if (retval < 0) { err_msg("Error setting cgroup attributes for pid:%s - %s\n", proc_entry->d_name, strerror(errno)); goto out_procfs; }
debug_msg("Set cgroup attributes for pid:%s\n", proc_entry->d_name); }
closedir(procfs); close(cg_fd); return 1;
out_procfs: closedir(procfs);out_cg: close(cg_fd); return 0;}
/** * auto_house_keeping - Automatically move rtla out of measurement threads * * Try to move rtla away from the tracer, if possible. * * Returns 1 on success, 0 otherwise. */int auto_house_keeping(cpu_set_t *monitored_cpus){ cpu_set_t rtla_cpus, house_keeping_cpus; int retval;
/* first get the CPUs in which rtla can actually run. */ retval = sched_getaffinity(getpid(), sizeof(rtla_cpus), &rtla_cpus); if (retval == -1) { debug_msg("Could not get rtla affinity, rtla might run with the threads!\n"); return 0; }
/* then check if the existing setup is already good. */ CPU_AND(&house_keeping_cpus, &rtla_cpus, monitored_cpus); if (!CPU_COUNT(&house_keeping_cpus)) { debug_msg("rtla and the monitored CPUs do not share CPUs."); debug_msg("Skipping auto house-keeping\n"); return 1; }
/* remove the intersection */ CPU_XOR(&house_keeping_cpus, &rtla_cpus, monitored_cpus);
/* get only those that rtla can run */ CPU_AND(&house_keeping_cpus, &house_keeping_cpus, &rtla_cpus);
/* is there any cpu left? */ if (!CPU_COUNT(&house_keeping_cpus)) { debug_msg("Could not find any CPU for auto house-keeping\n"); return 0; }
retval = sched_setaffinity(getpid(), sizeof(house_keeping_cpus), &house_keeping_cpus); if (retval == -1) { debug_msg("Could not set affinity for auto house-keeping\n"); return 0; }
debug_msg("rtla automatically moved to an auto house-keeping cpu set\n");
return 1;}
/* * strtoi - convert string to integer with error checking * * Returns 0 on success, -1 if conversion fails or result is out of int range. */int strtoi(const char *s, int *res){ char *end_ptr; long lres;
if (!*s) return -1;
errno = 0; lres = strtol(s, &end_ptr, 0); if (errno || *end_ptr || lres > INT_MAX || lres < INT_MIN) return -1;
*res = (int) lres; return 0;}
static inline void fatal_alloc(void){ fatal("Error allocating memory\n");}
void *calloc_fatal(size_t n, size_t size){ void *p = calloc(n, size);
if (!p) fatal_alloc();
return p;}
void *reallocarray_fatal(void *p, size_t n, size_t size){ p = reallocarray(p, n, size);
if (!p) fatal_alloc();
return p;}
char *strdup_fatal(const char *s){ char *p = strdup(s);
if (!p) fatal_alloc();
return p;}