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Date: Wed, 16 Jul 2014 11:44:49 +0200
From: Michal Hocko <mhocko@...e.cz>
To: Tejun Heo <tj@...nel.org>
Cc: lizefan@...wei.com, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
Vivek Goyal <vgoyal@...hat.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Aristeu Rozanski <aris@...hat.com>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 2/6] cgroup: rename cgroup_subsys->base_cftypes to
->legacy_cftypes
On Mon 14-07-14 11:44:04, Tejun Heo wrote:
> Currently, cgroup_subsys->base_cftypes is used for both the unified
> default hierarchy and legacy ones and subsystems can mark each file
> with either CFTYPE_ONLY_ON_DFL or CFTYPE_INSANE if it has to appear
> only on one of them. This is quite hairy and error-prone. Also, we
> may end up exposing interface files to the default hierarchy without
> thinking it through.
>
> cgroup_subsys will grow two separate cftype arrays and apply each only
> on the hierarchies of the matching type. This will allow organizing
> cftypes in a lot clearer way and encourage subsystems to scrutinize
> the interface which is being exposed in the new default hierarchy.
>
> In preparation, this patch renames cgroup_subsys->base_cftypes to
> cgroup_subsys->legacy_cftypes. This patch is pure rename.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Acked-by: Neil Horman <nhorman@...driver.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: Li Zefan <lizefan@...wei.com>
> Cc: Vivek Goyal <vgoyal@...hat.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Aristeu Rozanski <aris@...hat.com>
> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
OK so the transition to the default hierarchy will be opt-in rather than
opt-out which I originally expected. Will have a look and prepare the
core files which should stay and post the patch soon hopefully.
Acked-by: Michal Hocko <mhocko@...e.cz>
> ---
> block/blk-cgroup.c | 2 +-
> include/linux/cgroup.h | 2 +-
> kernel/cgroup.c | 4 ++--
> kernel/cgroup_freezer.c | 2 +-
> kernel/cpuset.c | 2 +-
> kernel/sched/core.c | 2 +-
> kernel/sched/cpuacct.c | 2 +-
> mm/memcontrol.c | 2 +-
> net/core/netclassid_cgroup.c | 2 +-
> net/core/netprio_cgroup.c | 2 +-
> security/device_cgroup.c | 2 +-
> 11 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
> index 63c3cd4..5cfbc72 100644
> --- a/block/blk-cgroup.c
> +++ b/block/blk-cgroup.c
> @@ -924,7 +924,7 @@ struct cgroup_subsys blkio_cgrp_subsys = {
> .css_offline = blkcg_css_offline,
> .css_free = blkcg_css_free,
> .can_attach = blkcg_can_attach,
> - .base_cftypes = blkcg_files,
> + .legacy_cftypes = blkcg_files,
> #ifdef CONFIG_MEMCG
> /*
> * This ensures that, if available, memcg is automatically enabled
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index 7bb2744..a6e9c2e 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -672,7 +672,7 @@ struct cgroup_subsys {
> struct list_head cfts;
>
> /* base cftypes, automatically registered with subsys itself */
> - struct cftype *base_cftypes;
> + struct cftype *legacy_cftypes; /* used on the legacy hierarchies */
>
> /*
> * A subsystem may depend on other subsystems. When such subsystem
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 7e5fee5..6496a83 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -4890,7 +4890,7 @@ int __init cgroup_init(void)
> */
> if (!ss->disabled) {
> cgrp_dfl_root.subsys_mask |= 1 << ss->id;
> - WARN_ON(cgroup_add_cftypes(ss, ss->base_cftypes));
> + WARN_ON(cgroup_add_cftypes(ss, ss->legacy_cftypes));
> }
> }
>
> @@ -5480,6 +5480,6 @@ static struct cftype debug_files[] = {
> struct cgroup_subsys debug_cgrp_subsys = {
> .css_alloc = debug_css_alloc,
> .css_free = debug_css_free,
> - .base_cftypes = debug_files,
> + .legacy_cftypes = debug_files,
> };
> #endif /* CONFIG_CGROUP_DEBUG */
> diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
> index a79e40f..92b98cc 100644
> --- a/kernel/cgroup_freezer.c
> +++ b/kernel/cgroup_freezer.c
> @@ -480,5 +480,5 @@ struct cgroup_subsys freezer_cgrp_subsys = {
> .css_free = freezer_css_free,
> .attach = freezer_attach,
> .fork = freezer_fork,
> - .base_cftypes = files,
> + .legacy_cftypes = files,
> };
> diff --git a/kernel/cpuset.c b/kernel/cpuset.c
> index 53a9bbf..f337f42 100644
> --- a/kernel/cpuset.c
> +++ b/kernel/cpuset.c
> @@ -2036,7 +2036,7 @@ struct cgroup_subsys cpuset_cgrp_subsys = {
> .cancel_attach = cpuset_cancel_attach,
> .attach = cpuset_attach,
> .bind = cpuset_bind,
> - .base_cftypes = files,
> + .legacy_cftypes = files,
> .early_init = 1,
> };
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 3bdf01b..6628e80 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -8088,7 +8088,7 @@ struct cgroup_subsys cpu_cgrp_subsys = {
> .can_attach = cpu_cgroup_can_attach,
> .attach = cpu_cgroup_attach,
> .exit = cpu_cgroup_exit,
> - .base_cftypes = cpu_files,
> + .legacy_cftypes = cpu_files,
> .early_init = 1,
> };
>
> diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
> index 9cf350c..dd7cbb5 100644
> --- a/kernel/sched/cpuacct.c
> +++ b/kernel/sched/cpuacct.c
> @@ -278,6 +278,6 @@ void cpuacct_account_field(struct task_struct *p, int index, u64 val)
> struct cgroup_subsys cpuacct_cgrp_subsys = {
> .css_alloc = cpuacct_css_alloc,
> .css_free = cpuacct_css_free,
> - .base_cftypes = files,
> + .legacy_cftypes = files,
> .early_init = 1,
> };
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index a2a4bd6..8331f27 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -7048,7 +7048,7 @@ struct cgroup_subsys memory_cgrp_subsys = {
> .cancel_attach = mem_cgroup_cancel_attach,
> .attach = mem_cgroup_move_task,
> .bind = mem_cgroup_bind,
> - .base_cftypes = mem_cgroup_files,
> + .legacy_cftypes = mem_cgroup_files,
> .early_init = 0,
> };
>
> diff --git a/net/core/netclassid_cgroup.c b/net/core/netclassid_cgroup.c
> index 30d903b..1f2a126 100644
> --- a/net/core/netclassid_cgroup.c
> +++ b/net/core/netclassid_cgroup.c
> @@ -107,5 +107,5 @@ struct cgroup_subsys net_cls_cgrp_subsys = {
> .css_online = cgrp_css_online,
> .css_free = cgrp_css_free,
> .attach = cgrp_attach,
> - .base_cftypes = ss_files,
> + .legacy_cftypes = ss_files,
> };
> diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
> index 2f385b9..cbd0a19 100644
> --- a/net/core/netprio_cgroup.c
> +++ b/net/core/netprio_cgroup.c
> @@ -249,7 +249,7 @@ struct cgroup_subsys net_prio_cgrp_subsys = {
> .css_online = cgrp_css_online,
> .css_free = cgrp_css_free,
> .attach = net_prio_attach,
> - .base_cftypes = ss_files,
> + .legacy_cftypes = ss_files,
> };
>
> static int netprio_device_event(struct notifier_block *unused,
> diff --git a/security/device_cgroup.c b/security/device_cgroup.c
> index d9d69e6..188c1d2 100644
> --- a/security/device_cgroup.c
> +++ b/security/device_cgroup.c
> @@ -796,7 +796,7 @@ struct cgroup_subsys devices_cgrp_subsys = {
> .css_free = devcgroup_css_free,
> .css_online = devcgroup_online,
> .css_offline = devcgroup_offline,
> - .base_cftypes = dev_cgroup_files,
> + .legacy_cftypes = dev_cgroup_files,
> };
>
> /**
> --
> 1.9.3
>
--
Michal Hocko
SUSE Labs
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