Review comments now inlined
On 07/23/2014 03:17 PM, Ivana Hutarova Varekova wrote:
> This patch adds the possibility to use meta character "*" as a shortcut
> for all mounted controllers. This meta character can be used in "-g" option.
> For example:
> $ cgcreate -g *:first -g cpu:second
> $ lssubsys
> cpuset:/
> cpuset:/first
> cpu,cpuacct:/
> cpu,cpuacct:/first
> cpu,cpuacct:/second
> memory:/
> memory:/first
> devices:/
> devices:/first
> freezer:/
> freezer:/first
> net_cls,net_prio:/
> net_cls,net_prio:/first
> blkio:/
> blkio:/first
> perf_event:/
> perf_event:/first
> hugetlb:/
> hugetlb:/first
>
>
> Signed-off-by: Ivana Hutarova Varekova <varek...@redhat.com>
> ---
> doc/man/cgcreate.1 | 3 +-
> src/tools/cgcreate.c | 82
> +++++++++++++++++++++++++++++++++++++++++++++-----
> 2 files changed, 75 insertions(+), 10 deletions(-)
>
> diff --git a/doc/man/cgcreate.1 b/doc/man/cgcreate.1
> index 7068073..557b5ae 100644
> --- a/doc/man/cgcreate.1
> +++ b/doc/man/cgcreate.1
> @@ -38,7 +38,8 @@ others permissions to the owners permissions).
> .TP
> .B -g <controllers>:<path>
> defines control groups to be added.
> -\fBcontrollers\fR is a list of controllers and
> +\fBcontrollers\fR is a list of controllers. Character "*" can be used
> +as a shortcut for "all mounted controllers".
> \fBpath\fR is the relative path to control groups
> in the given controllers list. This option can be specified
> multiple times.
> diff --git a/src/tools/cgcreate.c b/src/tools/cgcreate.c
> index 73abd91..b9c9b9d 100644
> --- a/src/tools/cgcreate.c
> +++ b/src/tools/cgcreate.c
> @@ -54,6 +54,57 @@ static void usage(int status, const char *program_name)
> printf(" -t <tuid>:<tgid> Owner of the tasks file\n");
> }
>
> +/* add all controllers to control cgroup structure */
> +int cgcreate_add_all_controllers(struct cgroup *cgroup)
"cgcreate_add_all_controllers" function should be placed in
wrapper.c as there are cgroup_add_controller and other functions working
with controllers.
> +{
> + int ret;
> + void *handle;
> + struct controller_data info;
> + struct cgroup_controller *cgc;
> +
> + /* go through the controller list */
> + ret = cgroup_get_all_controller_begin(&handle, &info);
> + if ((ret != 0) && (ret != ECGEOF)) {
> + fprintf(stderr, "cannot read controller data: %s\n",
> + cgroup_strerror(ret));
> + return ret;
> + }
> +
> + while (ret == 0) {
> + if (info.hierarchy == 0) {
> + /* the controller is not attached to any hierarchy
> + skip it */
> + goto next;
> + }
> +
> + /* add mounted controller to cgroup structure */
> + cgc = cgroup_add_controller(cgroup, info.name);
> + if (!cgc) {
> + ret = ECGINVAL;
> + fprintf(stderr, "controller %s can't be add\n",
> + info.name);
> + }
> +
> +next:
can be replaced with
/* the controller is attached to at least one hierarchy */
if (info.hierarchy != 0) {
/* add mounted controller to cgroup structure */
cgc = cgroup_add_controller(cgroup, info.name);
if (!cgc) {
ret = ECGINVAL;
fprintf(stderr, "controller %s can't be add\n",
info.name);
}
}
> + ret = cgroup_get_all_controller_next(&handle, &info);
> + if (ret && ret != ECGEOF)
> + goto end;
"goto end" can be replaced with break
> + }
> +
> +end:
> + cgroup_get_all_controller_end(&handle);
> +
> + if (ret == ECGEOF)
> + ret = 0;
> +
> + if (ret)
> + fprintf(stderr,
> + "cgroup_get_controller_begin/next failed (%s)\n",
> + cgroup_strerror(ret));
> +
> + return ret;
> +}
> +
>
> int main(int argc, char *argv[])
> {
> @@ -195,16 +246,29 @@ int main(int argc, char *argv[])
> /* add controllers to the new cgroup */
> j = 0;
> while (cgroup_list[i]->controllers[j]) {
> - cgc = cgroup_add_controller(cgroup,
> - cgroup_list[i]->controllers[j]);
> - if (!cgc) {
> - ret = ECGINVAL;
> - fprintf(stderr, "%s: "
> - "controller %s can't be add\n",
> - argv[0],
> + if (strcmp(cgroup_list[i]->controllers[j], "*") == 0) {
> + /* itis meta character -> add all controllers */
> + ret = cgcreate_add_all_controllers(cgroup);
> + if (ret != 0) {
> + ret = ECGINVAL;
> + fprintf(stderr, "%s: can't add ",
> + argv[0]);
> + fprintf(stderr, "all controllers\n");
> + cgroup_free(&cgroup);
> + goto err;
> + }
> + } else {
> + cgc = cgroup_add_controller(cgroup,
> cgroup_list[i]->controllers[j]);
> - cgroup_free(&cgroup);
> - goto err;
> + if (!cgc) {
> + ret = ECGINVAL;
> + fprintf(stderr, "%s: ", argv[0]);
> + fprintf(stderr, "controller %s",
> + cgroup_list[i]->controllers[j]);
> + fprintf(stderr, "can't be add\n");
> + cgroup_free(&cgroup);
> + goto err;
> + }
> }
> j++;
> }
>
>
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