Implement get_cgroup_from_page() / put_cgroup_from_page() in the cgroup memory controller to retrieve the owner of a page during writes in submit_bio() processed asynchronously by kernel threads (i.e. pdflush).
Note: right now this is no more than a hack to keep the things simpler; in perspective this functionality could/should be provided by bio-cgroup [1], instead of directly use the memcg page-tracking functionality. [1] http://people.valinux.co.jp/~ryov/bio-cgroup/ Signed-off-by: Andrea Righi <[EMAIL PROTECTED]> --- include/linux/memcontrol.h | 3 +++ mm/memcontrol.c | 26 ++++++++++++++++++++++++++ 2 files changed, 29 insertions(+), 0 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index ee1b2fc..92dfd40 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -50,6 +50,9 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem); extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); +extern struct cgroup *get_cgroup_from_page(struct page *page); +extern void put_cgroup_from_page(struct page *page); + #define mm_match_cgroup(mm, cgroup) \ ((cgroup) == mem_cgroup_from_task((mm)->owner)) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 2979d22..5321b8b 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -279,6 +279,32 @@ static void unlock_page_cgroup(struct page *page) bit_spin_unlock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup); } +struct cgroup *get_cgroup_from_page(struct page *page) +{ + struct page_cgroup *pc; + struct cgroup *cgrp = NULL; + + lock_page_cgroup(page); + pc = page_get_page_cgroup(page); + if (pc) { + css_get(&pc->mem_cgroup->css); + cgrp = pc->mem_cgroup->css.cgroup; + } + unlock_page_cgroup(page); + return cgrp; +} + +void put_cgroup_from_page(struct page *page) +{ + struct page_cgroup *pc; + + lock_page_cgroup(page); + pc = page_get_page_cgroup(page); + if (pc) + css_put(&pc->mem_cgroup->css); + unlock_page_cgroup(page); +} + static void __mem_cgroup_remove_list(struct mem_cgroup_per_zone *mz, struct page_cgroup *pc) { -- 1.5.4.3 _______________________________________________ Containers mailing list [EMAIL PROTECTED] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list Devel@openvz.org https://openvz.org/mailman/listinfo/devel
