From: Vasily Tarasov <[email protected]>
Registers the cfqio_subsys subsystem in the CGroups framework.
Signed-off-by: Vasily Tarasov <[email protected]>
---
--- /dev/null 2008-02-14 08:57:49.255923728 -0500
+++ linux-2.6.25-rc5-mm1/include/linux/cfqio-cgroup.h 2008-02-15 01:06:40.000000000 -0500
@@ -0,0 +1,26 @@
+/*
+ * include/linux/cfqio-cgroup.h
+ *
+ * cfqio_subsys: CGroup subsystem that allows CFQ recognize
+ * cgroups and perform scheduling according to this.
+ *
+ * Copyright (C) 2008 OpenVZ http://openvz.org
+ *
+ * Author: Vasily Tarasov <[email protected]>
+ *
+ */
+
+#ifndef _LINUX_CFQIO_CGROUP_H
+#define _LINUX_CFQIO_CGROUP_H
+
+#define CFQIO_SS_IOPRIO_DEF 4
+#define CFQIO_SS_IOPRIO_MAX 7
+#define CFQIO_SS_IOPRIO_MIN 0
+
+/* cfqio_subsys's per cgroup state holder */
+struct cfqio_ss_css {
+ struct cgroup_subsys_state css;
+ unsigned int ioprio;
+};
+
+#endif /* _LINUX_CFQIO_CGROUP_H */
--- linux-2.6.25-rc5-mm1/include/linux/cgroup_subsys.h.subsys 2008-02-15 00:49:56.000000000 -0500
+++ linux-2.6.25-rc5-mm1/include/linux/cgroup_subsys.h 2008-02-15 01:06:40.000000000 -0500
@@ -42,3 +42,9 @@ SUBSYS(mem_cgroup)
#endif
/* */
+
+#ifdef CONFIG_CGROUP_CFQIO
+SUBSYS(cfqio)
+#endif
+
+/* */
--- linux-2.6.25-rc5-mm1/block/Makefile.subsys 2008-02-15 00:49:11.000000000 -0500
+++ linux-2.6.25-rc5-mm1/block/Makefile 2008-02-15 01:06:40.000000000 -0500
@@ -11,6 +11,7 @@ obj-$(CONFIG_IOSCHED_NOOP) += noop-iosch
obj-$(CONFIG_IOSCHED_AS) += as-iosched.o
obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
+obj-$(CONFIG_CGROUP_CFQIO) += cfqio-cgroup.o
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
--- /dev/null 2008-02-14 08:57:49.255923728 -0500
+++ linux-2.6.25-rc5-mm1/block/cfqio-cgroup.c 2008-02-15 01:06:40.000000000 -0500
@@ -0,0 +1,97 @@
+/*
+ * block/cfqio-cgroup.c
+ *
+ * cfqio_cgroup: CGroup subsystem that allows CFQ recognize
+ * cgroups and perform scheduling according to this.
+ *
+ * Copyright (C) 2008 OpenVZ http://openvz.org
+ *
+ * Author: Vasily Tarasov <[email protected]>
+ *
+ */
+
+#include <linux/cgroup.h>
+#include <linux/cfqio-cgroup.h>
+#include <linux/err.h>
+
+static void cfqio_ss_fini(struct cfqio_ss_css *cfqio_css)
+{
+}
+
+static void cfqio_ss_init(struct cfqio_ss_css *cfqio_css)
+{
+ cfqio_css->ioprio = CFQIO_SS_IOPRIO_DEF;
+}
+
+static struct cgroup_subsys_state *
+cfqio_ss_cgrp_create(struct cgroup_subsys *subsys, struct cgroup *cgrp)
+{
+ struct cfqio_ss_css *cfqio_css;
+
+ cfqio_css = kmalloc(sizeof(*cfqio_css), GFP_KERNEL);
+ if (!cfqio_css)
+ return ERR_PTR(-ENOMEM);
+
+ cfqio_ss_init(cfqio_css);
+
+ return &cfqio_css->css;
+}
+
+static inline struct cfqio_ss_css *
+cfqio_ss_cgrp_css(struct cgroup *cgrp)
+{
+ return container_of(cgrp->subsys[cfqio_subsys_id],
+ struct cfqio_ss_css, css);
+}
+
+static void
+cfqio_ss_cgrp_destroy(struct cgroup_subsys *subsys, struct cgroup *cgrp)
+{
+ struct cfqio_ss_css *cfqio_css;
+
+ cfqio_css = cfqio_ss_cgrp_css(cgrp);
+ cfqio_ss_fini(cfqio_css);
+ kfree(cfqio_css);
+ return;
+}
+
+static u64
+cfqio_ss_ioprio_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ return (u64)cfqio_ss_cgrp_css(cgrp)->ioprio;
+}
+
+static int
+cfqio_ss_ioprio_write(struct cgroup *cgrp, struct cftype *cft, u64 val)
+{
+ if (val > CFQIO_SS_IOPRIO_MAX || val < CFQIO_SS_IOPRIO_MIN)
+ return -EINVAL;
+
+ cfqio_ss_cgrp_css(cgrp)->ioprio = val;
+
+ return 0;
+}
+
+/* array since more then one file are expected in the future */
+static struct cftype cfqio_ss_files[] = {
+ {
+ .name = "ioprio",
+ .read_uint = cfqio_ss_ioprio_read,
+ .write_uint = cfqio_ss_ioprio_write,
+ },
+};
+
+static int
+cfqio_ss_populate_dir(struct cgroup_subsys *ss, struct cgroup *cgrp)
+{
+ return cgroup_add_files(cgrp, ss, cfqio_ss_files,
+ ARRAY_SIZE(cfqio_ss_files));
+}
+
+struct cgroup_subsys cfqio_subsys = {
+ .name = "cfqio_subsys",
+ .subsys_id = cfqio_subsys_id,
+ .create = cfqio_ss_cgrp_create,
+ .destroy = cfqio_ss_cgrp_destroy,
+ .populate = cfqio_ss_populate_dir,
+};