From fe6934354f8e287275500cd6ec73826d4d6ad457 Mon Sep 17 00:00:00 2001 From: Paul Menage Date: Wed, 23 Sep 2009 15:56:20 -0700 Subject: [PATCH] cgroups: move the cgroup debug subsys into cgroup.c to access internal state While it's architecturally clean to have the cgroup debug subsystem be completely independent of the cgroups framework, it limits its usefulness for debugging the contents of internal data structures. Move the debug subsystem code into the scope of all the cgroups data structures to make more detailed debugging possible. Signed-off-by: Paul Menage Reviewed-by: Li Zefan Reviewed-by: KAMEZAWA Hiroyuki Cc: Balbir Singh Cc: Dhaval Giani Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/Makefile | 1 - kernel/cgroup.c | 88 +++++++++++++++++++++++++++++++++++ kernel/cgroup_debug.c | 105 ------------------------------------------ 3 files changed, 88 insertions(+), 106 deletions(-) delete mode 100644 kernel/cgroup_debug.c diff --git a/kernel/Makefile b/kernel/Makefile index 187c89b4783d..b8d4cd8ac0b9 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -58,7 +58,6 @@ obj-$(CONFIG_KEXEC) += kexec.o obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o obj-$(CONFIG_COMPAT) += compat.o obj-$(CONFIG_CGROUPS) += cgroup.o -obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o obj-$(CONFIG_CPUSETS) += cpuset.o obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 03204044622f..ccec722213a4 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -3781,3 +3781,91 @@ css_get_next(struct cgroup_subsys *ss, int id, return ret; } +#ifdef CONFIG_CGROUP_DEBUG +static struct cgroup_subsys_state *debug_create(struct cgroup_subsys *ss, + struct cgroup *cont) +{ + struct cgroup_subsys_state *css = kzalloc(sizeof(*css), GFP_KERNEL); + + if (!css) + return ERR_PTR(-ENOMEM); + + return css; +} + +static void debug_destroy(struct cgroup_subsys *ss, struct cgroup *cont) +{ + kfree(cont->subsys[debug_subsys_id]); +} + +static u64 cgroup_refcount_read(struct cgroup *cont, struct cftype *cft) +{ + return atomic_read(&cont->count); +} + +static u64 debug_taskcount_read(struct cgroup *cont, struct cftype *cft) +{ + return cgroup_task_count(cont); +} + +static u64 current_css_set_read(struct cgroup *cont, struct cftype *cft) +{ + return (u64)(unsigned long)current->cgroups; +} + +static u64 current_css_set_refcount_read(struct cgroup *cont, + struct cftype *cft) +{ + u64 count; + + rcu_read_lock(); + count = atomic_read(¤t->cgroups->refcount); + rcu_read_unlock(); + return count; +} + +static u64 releasable_read(struct cgroup *cgrp, struct cftype *cft) +{ + return test_bit(CGRP_RELEASABLE, &cgrp->flags); +} + +static struct cftype debug_files[] = { + { + .name = "cgroup_refcount", + .read_u64 = cgroup_refcount_read, + }, + { + .name = "taskcount", + .read_u64 = debug_taskcount_read, + }, + + { + .name = "current_css_set", + .read_u64 = current_css_set_read, + }, + + { + .name = "current_css_set_refcount", + .read_u64 = current_css_set_refcount_read, + }, + + { + .name = "releasable", + .read_u64 = releasable_read, + }, +}; + +static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont) +{ + return cgroup_add_files(cont, ss, debug_files, + ARRAY_SIZE(debug_files)); +} + +struct cgroup_subsys debug_subsys = { + .name = "debug", + .create = debug_create, + .destroy = debug_destroy, + .populate = debug_populate, + .subsys_id = debug_subsys_id, +}; +#endif /* CONFIG_CGROUP_DEBUG */ diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c deleted file mode 100644 index 0c92d797baa6..000000000000 --- a/kernel/cgroup_debug.c +++ /dev/null @@ -1,105 +0,0 @@ -/* - * kernel/cgroup_debug.c - Example cgroup subsystem that - * exposes debug info - * - * Copyright (C) Google Inc, 2007 - * - * Developed by Paul Menage (menage@google.com) - * - */ - -#include -#include -#include -#include - -#include - -static struct cgroup_subsys_state *debug_create(struct cgroup_subsys *ss, - struct cgroup *cont) -{ - struct cgroup_subsys_state *css = kzalloc(sizeof(*css), GFP_KERNEL); - - if (!css) - return ERR_PTR(-ENOMEM); - - return css; -} - -static void debug_destroy(struct cgroup_subsys *ss, struct cgroup *cont) -{ - kfree(cont->subsys[debug_subsys_id]); -} - -static u64 cgroup_refcount_read(struct cgroup *cont, struct cftype *cft) -{ - return atomic_read(&cont->count); -} - -static u64 taskcount_read(struct cgroup *cont, struct cftype *cft) -{ - u64 count; - - count = cgroup_task_count(cont); - return count; -} - -static u64 current_css_set_read(struct cgroup *cont, struct cftype *cft) -{ - return (u64)(long)current->cgroups; -} - -static u64 current_css_set_refcount_read(struct cgroup *cont, - struct cftype *cft) -{ - u64 count; - - rcu_read_lock(); - count = atomic_read(¤t->cgroups->refcount); - rcu_read_unlock(); - return count; -} - -static u64 releasable_read(struct cgroup *cgrp, struct cftype *cft) -{ - return test_bit(CGRP_RELEASABLE, &cgrp->flags); -} - -static struct cftype files[] = { - { - .name = "cgroup_refcount", - .read_u64 = cgroup_refcount_read, - }, - { - .name = "taskcount", - .read_u64 = taskcount_read, - }, - - { - .name = "current_css_set", - .read_u64 = current_css_set_read, - }, - - { - .name = "current_css_set_refcount", - .read_u64 = current_css_set_refcount_read, - }, - - { - .name = "releasable", - .read_u64 = releasable_read, - }, -}; - -static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont) -{ - return cgroup_add_files(cont, ss, files, ARRAY_SIZE(files)); -} - -struct cgroup_subsys debug_subsys = { - .name = "debug", - .create = debug_create, - .destroy = debug_destroy, - .populate = debug_populate, - .subsys_id = debug_subsys_id, -}; -- 2.20.1