Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932294Ab3HAVut (ORCPT ); Thu, 1 Aug 2013 17:50:49 -0400 Received: from mail-qa0-f54.google.com ([209.85.216.54]:57701 "EHLO mail-qa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932190Ab3HAVul (ORCPT ); Thu, 1 Aug 2013 17:50:41 -0400 From: Tejun Heo To: lizefan@huawei.com Cc: containers@lists.linux-foundation.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Tejun Heo , Johannes Weiner , Michal Hocko , Balbir Singh Subject: [PATCH 21/23] cgroup: make cftype->[un]register_event() deal with cgroup_subsys_state instead of cgroup Date: Thu, 1 Aug 2013 17:49:59 -0400 Message-Id: <1375393801-4817-22-git-send-email-tj@kernel.org> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1375393801-4817-1-git-send-email-tj@kernel.org> References: <1375393801-4817-1-git-send-email-tj@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10318 Lines: 265 cgroup is in the process of converting to css (cgroup_subsys_state) from cgroup as the principal subsystem interface handle. This is mostly to prepare for the unified hierarchy support where css's will be created and destroyed dynamically but also helps cleaning up subsystem implementations as css is usually what they are interested in anyway. cftype->[un]register_event() is among the remaining couple interfaces which still use struct cgroup. Convert it to cgroup_subsys_state. The conversion is mostly mechanical and removes the last users of mem_cgroup_from_cont() and cg_to_vmpressure(), which are removed. Signed-off-by: Tejun Heo Cc: Johannes Weiner Cc: Michal Hocko Cc: Balbir Singh --- include/linux/cgroup.h | 8 +++++--- include/linux/vmpressure.h | 6 ++++-- kernel/cgroup.c | 15 ++++++++------- mm/memcontrol.c | 21 ++++++++------------- mm/vmpressure.c | 21 +++++++++------------ 5 files changed, 34 insertions(+), 37 deletions(-) diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 6f6d87b..8f44411 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -506,15 +506,17 @@ struct cftype { * you want to provide this functionality. Use eventfd_signal() * on eventfd to send notification to userspace. */ - int (*register_event)(struct cgroup *cgrp, struct cftype *cft, - struct eventfd_ctx *eventfd, const char *args); + int (*register_event)(struct cgroup_subsys_state *css, + struct cftype *cft, struct eventfd_ctx *eventfd, + const char *args); /* * unregister_event() callback will be called when userspace * closes the eventfd or on cgroup removing. * This callback must be implemented, if you want provide * notification functionality. */ - void (*unregister_event)(struct cgroup *cgrp, struct cftype *cft, + void (*unregister_event)(struct cgroup_subsys_state *css, + struct cftype *cft, struct eventfd_ctx *eventfd); }; diff --git a/include/linux/vmpressure.h b/include/linux/vmpressure.h index 76be077..b239482 100644 --- a/include/linux/vmpressure.h +++ b/include/linux/vmpressure.h @@ -33,10 +33,12 @@ extern void vmpressure_init(struct vmpressure *vmpr); extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg); extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr); extern struct vmpressure *css_to_vmpressure(struct cgroup_subsys_state *css); -extern int vmpressure_register_event(struct cgroup *cg, struct cftype *cft, +extern int vmpressure_register_event(struct cgroup_subsys_state *css, + struct cftype *cft, struct eventfd_ctx *eventfd, const char *args); -extern void vmpressure_unregister_event(struct cgroup *cg, struct cftype *cft, +extern void vmpressure_unregister_event(struct cgroup_subsys_state *css, + struct cftype *cft, struct eventfd_ctx *eventfd); #else static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, diff --git a/kernel/cgroup.c b/kernel/cgroup.c index c61b24f..e0ef58e 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -159,9 +159,9 @@ struct css_id { */ struct cgroup_event { /* - * Cgroup which the event belongs to. + * css which the event belongs to. */ - struct cgroup *cgrp; + struct cgroup_subsys_state *css; /* * Control file which the event associated. */ @@ -3948,11 +3948,12 @@ static void cgroup_event_remove(struct work_struct *work) { struct cgroup_event *event = container_of(work, struct cgroup_event, remove); - struct cgroup *cgrp = event->cgrp; + struct cgroup_subsys_state *css = event->css; + struct cgroup *cgrp = css->cgroup; remove_wait_queue(event->wqh, &event->wait); - event->cft->unregister_event(cgrp, event->cft, event->eventfd); + event->cft->unregister_event(css, event->cft, event->eventfd); /* Notify userspace the event is going away. */ eventfd_signal(event->eventfd, 1); @@ -3972,7 +3973,7 @@ static int cgroup_event_wake(wait_queue_t *wait, unsigned mode, { struct cgroup_event *event = container_of(wait, struct cgroup_event, wait); - struct cgroup *cgrp = event->cgrp; + struct cgroup *cgrp = event->css->cgroup; unsigned long flags = (unsigned long)key; if (flags & POLLHUP) { @@ -4041,7 +4042,7 @@ static int cgroup_write_event_control(struct cgroup_subsys_state *css, event = kzalloc(sizeof(*event), GFP_KERNEL); if (!event) return -ENOMEM; - event->cgrp = cgrp; + event->css = css; INIT_LIST_HEAD(&event->list); init_poll_funcptr(&event->pt, cgroup_event_ptable_queue_proc); init_waitqueue_func_entry(&event->wait, cgroup_event_wake); @@ -4092,7 +4093,7 @@ static int cgroup_write_event_control(struct cgroup_subsys_state *css, goto out_put_cfile; } - ret = event->cft->register_event(cgrp, event->cft, + ret = event->cft->register_event(css, event->cft, event->eventfd, buffer); if (ret) goto out_put_cfile; diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 95106a9..2885e3e 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1034,11 +1034,6 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page) preempt_enable(); } -static inline struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) -{ - return mem_cgroup_from_css(cgroup_css(cont, mem_cgroup_subsys_id)); -} - struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) { /* @@ -5620,10 +5615,10 @@ static void mem_cgroup_oom_notify(struct mem_cgroup *memcg) mem_cgroup_oom_notify_cb(iter); } -static int mem_cgroup_usage_register_event(struct cgroup *cgrp, +static int mem_cgroup_usage_register_event(struct cgroup_subsys_state *css, struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) { - struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); + struct mem_cgroup *memcg = mem_cgroup_from_css(css); struct mem_cgroup_thresholds *thresholds; struct mem_cgroup_threshold_ary *new; enum res_type type = MEMFILE_TYPE(cft->private); @@ -5703,10 +5698,10 @@ unlock: return ret; } -static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp, +static void mem_cgroup_usage_unregister_event(struct cgroup_subsys_state *css, struct cftype *cft, struct eventfd_ctx *eventfd) { - struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); + struct mem_cgroup *memcg = mem_cgroup_from_css(css); struct mem_cgroup_thresholds *thresholds; struct mem_cgroup_threshold_ary *new; enum res_type type = MEMFILE_TYPE(cft->private); @@ -5782,10 +5777,10 @@ unlock: mutex_unlock(&memcg->thresholds_lock); } -static int mem_cgroup_oom_register_event(struct cgroup *cgrp, +static int mem_cgroup_oom_register_event(struct cgroup_subsys_state *css, struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) { - struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); + struct mem_cgroup *memcg = mem_cgroup_from_css(css); struct mem_cgroup_eventfd_list *event; enum res_type type = MEMFILE_TYPE(cft->private); @@ -5807,10 +5802,10 @@ static int mem_cgroup_oom_register_event(struct cgroup *cgrp, return 0; } -static void mem_cgroup_oom_unregister_event(struct cgroup *cgrp, +static void mem_cgroup_oom_unregister_event(struct cgroup_subsys_state *css, struct cftype *cft, struct eventfd_ctx *eventfd) { - struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); + struct mem_cgroup *memcg = mem_cgroup_from_css(css); struct mem_cgroup_eventfd_list *ev, *tmp; enum res_type type = MEMFILE_TYPE(cft->private); diff --git a/mm/vmpressure.c b/mm/vmpressure.c index 2a8a736..13489b1 100644 --- a/mm/vmpressure.c +++ b/mm/vmpressure.c @@ -74,11 +74,6 @@ static struct vmpressure *work_to_vmpressure(struct work_struct *work) return container_of(work, struct vmpressure, work); } -static struct vmpressure *cg_to_vmpressure(struct cgroup *cg) -{ - return css_to_vmpressure(cgroup_css(cg, mem_cgroup_subsys_id)); -} - static struct vmpressure *vmpressure_parent(struct vmpressure *vmpr) { struct cgroup_subsys_state *css = vmpressure_to_css(vmpr); @@ -283,7 +278,7 @@ void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio) /** * vmpressure_register_event() - Bind vmpressure notifications to an eventfd - * @cg: cgroup that is interested in vmpressure notifications + * @css: css that is interested in vmpressure notifications * @cft: cgroup control files handle * @eventfd: eventfd context to link notifications with * @args: event arguments (used to set up a pressure level threshold) @@ -298,10 +293,11 @@ void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio) * cftype).register_event, and then cgroup core will handle everything by * itself. */ -int vmpressure_register_event(struct cgroup *cg, struct cftype *cft, - struct eventfd_ctx *eventfd, const char *args) +int vmpressure_register_event(struct cgroup_subsys_state *css, + struct cftype *cft, struct eventfd_ctx *eventfd, + const char *args) { - struct vmpressure *vmpr = cg_to_vmpressure(cg); + struct vmpressure *vmpr = css_to_vmpressure(css); struct vmpressure_event *ev; int level; @@ -329,7 +325,7 @@ int vmpressure_register_event(struct cgroup *cg, struct cftype *cft, /** * vmpressure_unregister_event() - Unbind eventfd from vmpressure - * @cg: cgroup handle + * @css: css handle * @cft: cgroup control files handle * @eventfd: eventfd context that was used to link vmpressure with the @cg * @@ -341,10 +337,11 @@ int vmpressure_register_event(struct cgroup *cg, struct cftype *cft, * cftype).unregister_event, and then cgroup core will handle everything * by itself. */ -void vmpressure_unregister_event(struct cgroup *cg, struct cftype *cft, +void vmpressure_unregister_event(struct cgroup_subsys_state *css, + struct cftype *cft, struct eventfd_ctx *eventfd) { - struct vmpressure *vmpr = cg_to_vmpressure(cg); + struct vmpressure *vmpr = css_to_vmpressure(css); struct vmpressure_event *ev; mutex_lock(&vmpr->events_lock); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/