mirror of
https://github.com/troglobit/finit.git
synced 2026-10-10 16:52:39 +07:00
Joachim Wiberg
6a6f3a8291
Since the cgroups support in Finit is not yet officially released, we
decided to change the back-end to use cgroups v2 instead of the aging
and rather clumsy cgroups v1. Even this initial refactor is a lot
easier to read and understand, more can still be done since there's
a lot of concepts, data values and the ilk that can now be shared
between different controllers.
Still ToDo: inotify for cgroup.events to clean up leaf nodes, which
in cgroups v1 was handled by cgreaper.sh. This is fixed
in the next commit in the series.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/* Finit control group support functions
|
|
*
|
|
* Copyright (c) 2019-2021 Joachim Wiberg <troglobit@gmail.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <lite/lite.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/sysinfo.h> /* get_nprocs_conf() */
|
|
|
|
#include "finit.h"
|
|
#include "log.h"
|
|
#include "util.h"
|
|
|
|
static char controllers[256];
|
|
|
|
static void group_init(char *path, int leaf, int weight)
|
|
{
|
|
char file[strlen(path) + 64];
|
|
|
|
if (mkdir(path, 0755) && EEXIST != errno) {
|
|
_pe("Failed creating cgroup %s", path);
|
|
return;
|
|
}
|
|
|
|
/* enable detected controllers on domain groups */
|
|
if (!leaf) {
|
|
paste(file, sizeof(file), path, "cgroup.subtree_control");
|
|
echo(file, 0, controllers);
|
|
}
|
|
|
|
/* set initial group weight */
|
|
if (weight) {
|
|
paste(file, sizeof(file), path, "cpu.weight");
|
|
echo(file, 0, "%d", weight);
|
|
}
|
|
}
|
|
|
|
static int cgroup_leaf_init(char *group, char *name, int pid)
|
|
{
|
|
char path[256];
|
|
|
|
if (pid <= 1) {
|
|
errno = EINVAL;
|
|
return 1;
|
|
}
|
|
|
|
snprintf(path, sizeof(path), "/sys/fs/cgroup/%s/%s", group, name);
|
|
group_init(path, 1, 0);
|
|
|
|
strlcat(path, "/cgroup.procs", sizeof(path));
|
|
|
|
return echo(path, 0, "%d", pid);
|
|
}
|
|
|
|
int cgroup_user(char *name, int pid)
|
|
{
|
|
return cgroup_leaf_init("user", name, pid);
|
|
}
|
|
|
|
int cgroup_service(char *name, int pid)
|
|
{
|
|
return cgroup_leaf_init("system", name, pid);
|
|
}
|
|
|
|
static void append_ctrl(char *ctrl)
|
|
{
|
|
if (controllers[0])
|
|
strlcat(controllers, " ", sizeof(controllers));
|
|
|
|
strlcat(controllers, "+", sizeof(controllers));
|
|
strlcat(controllers, ctrl, sizeof(controllers));
|
|
}
|
|
|
|
/*
|
|
* Called by Finit at early boot to mount initial cgroups
|
|
*/
|
|
void cgroup_init(void)
|
|
{
|
|
int opts = MS_NODEV | MS_NOEXEC | MS_NOSUID;
|
|
char buf[80];
|
|
FILE *fp;
|
|
|
|
if (mount("none", FINIT_CGPATH, "cgroup2", opts, NULL)) {
|
|
_pe("Failed mounting cgroup v2");
|
|
return;
|
|
}
|
|
|
|
/* Find available controllers */
|
|
fp = fopen(FINIT_CGPATH "/cgroup.controllers", "r");
|
|
if (!fp) {
|
|
_pe("Failed opening %s", FINIT_CGPATH "/cgroup.controllers");
|
|
return;
|
|
}
|
|
|
|
if (fgets(buf, sizeof(buf), fp)) {
|
|
char *cgroup;
|
|
|
|
cgroup = strtok(chomp(buf), "\t ");
|
|
while (cgroup) {
|
|
append_ctrl(cgroup);
|
|
cgroup = strtok(NULL, "\t ");
|
|
}
|
|
}
|
|
|
|
fclose(fp);
|
|
|
|
/* Enable all controllers */
|
|
echo(FINIT_CGPATH "/cgroup.subtree_control", 0, controllers);
|
|
|
|
/* Default groups, PID 1, services, and user/login processes */
|
|
group_init(FINIT_CGPATH "/init", 1, 100);
|
|
group_init(FINIT_CGPATH "/user", 0, 100);
|
|
group_init(FINIT_CGPATH "/system", 0, 9800);
|
|
|
|
/* Move ourselves to init */
|
|
echo(FINIT_CGPATH "/init/cgroup.procs", 0, "1");
|
|
}
|
|
|
|
/**
|
|
* Local Variables:
|
|
* indent-tabs-mode: t
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|