#include <stdio.h>
#include <stdlib.h>
#include "fio.h"
+#include "flist.h"
#include "cgroup.h"
+#include "smalloc.h"
+
+static struct flist_head *cgroup_list;
+static struct fio_mutex *lock;
+
+struct cgroup_member {
+ struct flist_head list;
+ char *root;
+};
+
+static void add_cgroup(const char *name)
+{
+ struct cgroup_member *cm;
+
+ cm = smalloc(sizeof(*cm));
+ INIT_FLIST_HEAD(&cm->list);
+ cm->root = smalloc_strdup(name);
+
+ fio_mutex_down(lock);
+
+ if (!cgroup_list) {
+ cgroup_list = smalloc(sizeof(struct flist_head));
+ INIT_FLIST_HEAD(cgroup_list);
+ }
+
+ flist_add_tail(&cm->list, cgroup_list);
+ fio_mutex_up(lock);
+}
+
+void cgroup_kill(void)
+{
+ struct flist_head *n, *tmp;
+ struct cgroup_member *cm;
+
+ fio_mutex_down(lock);
+ if (!cgroup_list)
+ goto out;
+
+ flist_for_each_safe(n, tmp, cgroup_list) {
+ cm = flist_entry(n, struct cgroup_member, list);
+ rmdir(cm->root);
+ flist_del(&cm->list);
+ sfree(cm->root);
+ sfree(cm);
+ }
+
+ sfree(cgroup_list);
+ cgroup_list = NULL;
+out:
+ fio_mutex_up(lock);
+}
+
+/*
+ * Check if the given root appears valid
+ */
+static int cgroup_check_fs(struct thread_data *td)
+{
+ struct stat sb;
+ char tmp[256];
+
+ sprintf(tmp, "%s/tasks", td->o.cgroup_root);
+ return stat(tmp, &sb);
+}
static char *get_cgroup_root(struct thread_data *td)
{
return str;
}
-/*
- * Add pid to given class
- */
-static int cgroup_add_pid(struct thread_data *td)
+static int cgroup_write_pid(struct thread_data *td, const char *root)
{
- char *root, tmp[256];
+ char tmp[256];
FILE *f;
-
- root = get_cgroup_root(td);
+
sprintf(tmp, "%s/tasks", root);
-
f = fopen(tmp, "w");
if (!f) {
td_verror(td, errno, "cgroup open tasks");
fprintf(f, "%d", td->pid);
fclose(f);
- free(root);
return 0;
+
}
/*
- * Move pid to root class
+ * Add pid to given class
*/
-static int cgroup_del_pid(struct thread_data *td)
+static int cgroup_add_pid(struct thread_data *td)
{
- char tmp[256];
- FILE *f;
-
- sprintf(tmp, "%s/tasks", td->o.cgroup_root);
- f = fopen(tmp, "w");
- if (!f) {
- td_verror(td, errno, "cgroup open tasks");
- return 1;
- }
+ char *root;
+ int ret;
- fprintf(f, "%d", td->pid);
- fclose(f);
- return 0;
+ root = get_cgroup_root(td);
+ ret = cgroup_write_pid(td, root);
+ free(root);
+ return ret;
}
+/*
+ * Move pid to root class
+ */
+static int cgroup_del_pid(struct thread_data *td)
+{
+ return cgroup_write_pid(td, td->o.cgroup_root);
+}
int cgroup_setup(struct thread_data *td)
{
char *root, tmp[256];
FILE *f;
+ if (cgroup_check_fs(td)) {
+ log_err("fio: blkio cgroup mount point %s not valid\n",
+ td->o.cgroup_root);
+ return 1;
+ }
+
/*
* Create container, if it doesn't exist
*/
if (__e != EEXIST) {
td_verror(td, __e, "cgroup mkdir");
- return 1;
+ goto err;
}
} else
- td->o.cgroup_was_created = 1;
+ add_cgroup(root);
+
+ if (td->o.cgroup_weight) {
+ sprintf(tmp, "%s/blkio.weight", root);
+ f = fopen(tmp, "w");
+ if (!f) {
+ td_verror(td, errno, "cgroup open weight");
+ goto err;
+ }
- sprintf(tmp, "%s/blkio.weight", root);
- f = fopen(tmp, "w");
- if (!f) {
- td_verror(td, errno, "cgroup open weight");
- return 1;
+ fprintf(f, "%d", td->o.cgroup_weight);
+ fclose(f);
}
- fprintf(f, "%d", td->o.cgroup_weight);
- fclose(f);
free(root);
if (cgroup_add_pid(td))
return 1;
return 0;
+err:
+ free(root);
+ return 1;
}
void cgroup_shutdown(struct thread_data *td)
{
- if (!td->o.cgroup_weight)
+ if (cgroup_check_fs(td))
+ return;
+ if (!td->o.cgroup_weight && td->o.cgroup)
return;
cgroup_del_pid(td);
+}
- if (td->o.cgroup_was_created) {
- char *root;
- root = get_cgroup_root(td);
- rmdir(root);
- free(root);
- }
+static void fio_init cgroup_init(void)
+{
+ lock = fio_mutex_init(1);
+}
+
+static void fio_exit cgroup_exit(void)
+{
+ fio_mutex_remove(lock);
}