*/
#include <stdio.h>
#include <stdlib.h>
+#include <mntent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
#include "fio.h"
+#include "flist.h"
#include "cgroup.h"
+#include "smalloc.h"
-/*
- * Check if the given root appears valid
- */
-static int cgroup_check_fs(struct thread_data *td)
+static struct fio_mutex *lock;
+
+struct cgroup_member {
+ struct flist_head list;
+ char *root;
+ unsigned int cgroup_nodelete;
+};
+
+static char *find_cgroup_mnt(struct thread_data *td)
{
- struct stat sb;
- char tmp[256];
+ char *mntpoint = NULL;
+ struct mntent *mnt, dummy;
+ char buf[256] = {0};
+ FILE *f;
+
+ f = setmntent("/proc/mounts", "r");
+ if (!f) {
+ td_verror(td, errno, "setmntent /proc/mounts");
+ return NULL;
+ }
+
+ while ((mnt = getmntent_r(f, &dummy, buf, sizeof(buf))) != NULL) {
+ if (!strcmp(mnt->mnt_type, "cgroup") &&
+ strstr(mnt->mnt_opts, "blkio"))
+ break;
+ }
+
+ if (mnt)
+ mntpoint = smalloc_strdup(mnt->mnt_dir);
+ else
+ log_err("fio: cgroup blkio does not appear to be mounted\n");
+
+ endmntent(f);
+ return mntpoint;
+}
+
+static void add_cgroup(struct thread_data *td, const char *name,
+ struct flist_head *clist)
+{
+ struct cgroup_member *cm;
+
+ cm = smalloc(sizeof(*cm));
+ INIT_FLIST_HEAD(&cm->list);
+ cm->root = smalloc_strdup(name);
+ if (td->o.cgroup_nodelete)
+ cm->cgroup_nodelete = 1;
+ fio_mutex_down(lock);
+ flist_add_tail(&cm->list, clist);
+ fio_mutex_up(lock);
+}
+
+void cgroup_kill(struct flist_head *clist)
+{
+ struct flist_head *n, *tmp;
+ struct cgroup_member *cm;
+
+ fio_mutex_down(lock);
+
+ flist_for_each_safe(n, tmp, clist) {
+ cm = flist_entry(n, struct cgroup_member, list);
+ if (!cm->cgroup_nodelete)
+ rmdir(cm->root);
+ flist_del(&cm->list);
+ sfree(cm->root);
+ sfree(cm);
+ }
- sprintf(tmp, "%s/tasks", td->o.cgroup_root);
- return stat(tmp, &sb);
+ fio_mutex_up(lock);
}
-static char *get_cgroup_root(struct thread_data *td)
+static char *get_cgroup_root(struct thread_data *td, char *mnt)
{
char *str = malloc(64);
if (td->o.cgroup)
- sprintf(str, "%s/%s", td->o.cgroup_root, td->o.cgroup);
+ sprintf(str, "%s%s%s", mnt, FIO_OS_PATH_SEPARATOR, td->o.cgroup);
else
- sprintf(str, "%s/%s", td->o.cgroup_root, td->o.name);
+ sprintf(str, "%s%s%s", mnt, FIO_OS_PATH_SEPARATOR, td->o.name);
return str;
}
-/*
- * Add pid to given class
- */
-static int cgroup_add_pid(struct thread_data *td)
+static int write_int_to_file(struct thread_data *td, const char *path,
+ const char *filename, unsigned int val,
+ const char *onerr)
{
- char *root, tmp[256];
+ char tmp[256];
FILE *f;
- root = get_cgroup_root(td);
- sprintf(tmp, "%s/tasks", root);
-
+ sprintf(tmp, "%s%s%s", path, FIO_OS_PATH_SEPARATOR, filename);
f = fopen(tmp, "w");
if (!f) {
- td_verror(td, errno, "cgroup open tasks");
+ td_verror(td, errno, onerr);
return 1;
}
- fprintf(f, "%d", td->pid);
+ fprintf(f, "%u", val);
fclose(f);
- free(root);
return 0;
+
+}
+
+static int cgroup_write_pid(struct thread_data *td, const char *root)
+{
+ unsigned int val = td->pid;
+
+ return write_int_to_file(td, root, "tasks", val, "cgroup write pid");
}
/*
* Move pid to root class
*/
-static int cgroup_del_pid(struct thread_data *td)
+static int cgroup_del_pid(struct thread_data *td, char *mnt)
{
- 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;
- }
-
- fprintf(f, "%d", td->pid);
- fclose(f);
- return 0;
+ return cgroup_write_pid(td, mnt);
}
-
-int cgroup_setup(struct thread_data *td)
+int cgroup_setup(struct thread_data *td, struct flist_head *clist, char **mnt)
{
- char *root, tmp[256];
- FILE *f;
+ char *root;
- if (cgroup_check_fs(td)) {
- log_err("fio: blkio cgroup mount point %s not valid\n",
- td->o.cgroup_root);
- return 1;
+ if (!*mnt) {
+ *mnt = find_cgroup_mnt(td);
+ if (!*mnt)
+ return 1;
}
/*
* Create container, if it doesn't exist
*/
- root = get_cgroup_root(td);
+ root = get_cgroup_root(td, *mnt);
if (mkdir(root, 0755) < 0) {
int __e = errno;
if (__e != EEXIST) {
td_verror(td, __e, "cgroup mkdir");
- return 1;
+ log_err("fio: path %s\n", root);
+ goto err;
}
} else
- td->o.cgroup_was_created = 1;
+ add_cgroup(td, root, clist);
- sprintf(tmp, "%s/blkio.weight", root);
- f = fopen(tmp, "w");
- if (!f) {
- td_verror(td, errno, "cgroup open weight");
- return 1;
+ if (td->o.cgroup_weight) {
+ if (write_int_to_file(td, root, "blkio.weight",
+ td->o.cgroup_weight,
+ "cgroup open weight"))
+ goto err;
}
- fprintf(f, "%d", td->o.cgroup_weight);
- fclose(f);
- free(root);
-
- if (cgroup_add_pid(td))
- return 1;
+ if (!cgroup_write_pid(td, root)) {
+ free(root);
+ return 0;
+ }
- return 0;
+err:
+ free(root);
+ return 1;
}
-void cgroup_shutdown(struct thread_data *td)
+void cgroup_shutdown(struct thread_data *td, char **mnt)
{
- if (cgroup_check_fs(td))
+ if (*mnt == NULL)
return;
- if (!td->o.cgroup_weight)
+ if (!td->o.cgroup_weight && !td->o.cgroup)
return;
- cgroup_del_pid(td);
+ cgroup_del_pid(td, *mnt);
+}
- if (td->o.cgroup_was_created) {
- char *root;
+static void fio_init cgroup_init(void)
+{
+ lock = fio_mutex_init(1);
+}
- root = get_cgroup_root(td);
- rmdir(root);
- free(root);
- }
+static void fio_exit cgroup_exit(void)
+{
+ fio_mutex_remove(lock);
}
projects / fio.git / blobdiff