Messages in this thread Patch in this message | | | From | "Satoshi UCHIDA" <> | Subject | [RFC][patch 3/11][CFQ-cgroup] Introduce cgroup subsystem | Date | Tue, 1 Apr 2008 18:32:29 +0900 |
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This patch introduces a simple cgroup subsystem. New cgroup subsystem is called cfq_cgroup.
Signed-off-by: Satoshi UCHIDA <uchida@ap.jp.nec.com>
diff --git a/block/Makefile b/block/Makefile index 5a43c7d..ea07b46 100644 --- a/block/Makefile +++ b/block/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o obj-$(CONFIG_IOSCHED_AS) += as-iosched.o obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o +obj-$(CONFIG_CGROUP_CFQ) += cfq-cgroup.o obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c new file mode 100644 index 0000000..cea2b92 --- /dev/null +++ b/block/cfq-cgroup.c @@ -0,0 +1,57 @@ +/* + * CFQ CGROUP disk scheduler. + * + * This program is a wrapper program that is + * extend CFQ disk scheduler for handling + * cgroup subsystem. + * + * This program is based on original CFQ code. + * + * Copyright (C) 2008 Satoshi UCHIDA <s-uchida@ap.jp.nec.com> + * and NEC Corp. + */ + +#include <linux/blkdev.h> +#include <linux/cgroup.h> +#include <linux/cfq-iosched.h> + +struct cfq_cgroup { + struct cgroup_subsys_state css; +}; + + +static inline struct cfq_cgroup *cgroup_to_cfq_cgroup(struct cgroup *cont) +{ + return container_of(cgroup_subsys_state(cont, cfq_cgroup_subsys_id), + struct cfq_cgroup, css); +} + +static struct cgroup_subsys_state * +cfq_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) +{ + struct cfq_cgroup *cfqc; + + if (!capable(CAP_SYS_ADMIN)) + return ERR_PTR(-EPERM); + + if (!cgroup_is_descendant(cont)) + return ERR_PTR(-EPERM); + + cfqc = kzalloc(sizeof(struct cfq_cgroup), GFP_KERNEL); + if (unlikely(!cfqc)) + return ERR_PTR(-ENOMEM); + + return &cfqc->css; +} + +static void cfq_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cont) +{ + kfree(cgroup_to_cfq_cgroup(cont)); +} + +struct cgroup_subsys cfq_cgroup_subsys = { + .name = "cfq_cgroup", + .create = cfq_cgroup_create, + .destroy = cfq_cgroup_destroy, + .subsys_id = cfq_cgroup_subsys_id, +}; diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h index 1ddebfc..5d2e991 100644 --- a/include/linux/cgroup_subsys.h +++ b/include/linux/cgroup_subsys.h @@ -42,3 +42,9 @@ SUBSYS(mem_cgroup) #endif /* */ + +#ifdef CONFIG_CGROUP_CFQ +SUBSYS(cfq_cgroup) +#endif + +/* */
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