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cgroup: try to set clone_children

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Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Serge Hallyn 2013-03-12 20:21:42 -05:00
parent 251d0d2a8b
commit fc7de5616f
1 changed files with 26 additions and 0 deletions
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26
src/lxc/cgroup.c
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@ -557,6 +557,31 @@ out:
free(parentpath);
}
/*
* If first creating the /sys/fs/cgroup/$subsys/lxc container, then
* try to set clone_children to 1. Some kernels don't support
* clone_children, and cgroup maintainer wants to deprecate it. So
* XXX TODO we should instead after each cgroup mkdir (here and in
* hooks/mountcgroup) check if cpuset is in the subsystems, and if so
* manually copy over mems and cpus.
*/
static void set_clone_children(const char *mntdir, const char *init)
{
char path[MAXPATHLEN];
FILE *fout;
int ret;
ret = snprintf(path, MAXPATHLEN, "%s%s/cgroup.clone_children", mntdir, init);
INFO("writing to %s\n", path);
if (ret < 0 || ret > MAXPATHLEN)
return;
fout = fopen(path, "w");
if (!fout)
return;
fprintf(fout, "1\n");
fclose(fout);
}
/*
* Make sure the 'cgroup group' exists, so that we don't have to worry about
* that later.
@ -597,6 +622,7 @@ static int create_lxcgroups(const char *lxcgroup)
if (ret < 0 || ret >= MAXPATHLEN)
goto fail;
if (access(path, F_OK)) {
set_clone_children(mntent->mnt_dir, init);
ret = mkdir(path, 0755);
if (ret == -1 && errno != EEXIST) {
SYSERROR("failed to create '%s' directory", path);