From: Michal Hocko <mhocko@suse.cz> To: Johannes Weiner <hannes@cmpxchg.org> Cc: Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com>, Tejun Heo <tj@kernel.org>, Vladimir Davydov <vdavydov@parallels.com>, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [patch 13/13] mm: memcontrol: rewrite uncharge API Date: Tue, 15 Jul 2014 14:19:35 +0200 [thread overview] Message-ID: <20140715121935.GB9366@dhcp22.suse.cz> (raw) In-Reply-To: <20140715082545.GA9366@dhcp22.suse.cz> [...] > +/** > + * mem_cgroup_migrate - migrate a charge to another page > + * @oldpage: currently charged page > + * @newpage: page to transfer the charge to > + * @lrucare: page might be on LRU already which one? I guess the newpage? > + * > + * Migrate the charge from @oldpage to @newpage. > + * > + * Both pages must be locked, @newpage->mapping must be set up. > + */ > +void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, > + bool lrucare) > +{ > + unsigned int nr_pages = 1; > + struct page_cgroup *pc; > + > + VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage); > + VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); > + VM_BUG_ON_PAGE(PageLRU(oldpage), oldpage); > + VM_BUG_ON_PAGE(PageLRU(newpage), newpage); VM_BUG_ON_PAGE(PageLRU(newpage) && !lruvec, newpage); > + VM_BUG_ON_PAGE(PageAnon(oldpage) != PageAnon(newpage), newpage); > + > + if (mem_cgroup_disabled()) > + return; > + > + pc = lookup_page_cgroup(oldpage); > + if (!PageCgroupUsed(pc)) > + return; > + > + /* Already migrated */ > + if (!(pc->flags & PCG_MEM)) > + return; > + > + VM_BUG_ON_PAGE(do_swap_account && !(pc->flags & PCG_MEMSW), oldpage); > + pc->flags &= ~(PCG_MEM | PCG_MEMSW); What about PCG_USED? Wouldn't we uncharge the currently transfered charge when oldpage does its last put_page when the migration is done? On a not directly related note. I was quite surprised to see that __unmap_and_move calls putback_lru_page on oldpage even when migration succeeded. So it goes through mem_cgroup_page_lruvec which checks PCG_USED and resets pc->mem_cgroup to root for !PCG_USED. > + > + if (PageTransHuge(oldpage)) { > + nr_pages <<= compound_order(oldpage); > + VM_BUG_ON_PAGE(!PageTransHuge(oldpage), oldpage); > + VM_BUG_ON_PAGE(!PageTransHuge(newpage), newpage); > + } > + > + commit_charge(newpage, pc->mem_cgroup, nr_pages, lrucare); > +} -- Michal Hocko SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@suse.cz> To: Johannes Weiner <hannes@cmpxchg.org> Cc: Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com>, Tejun Heo <tj@kernel.org>, Vladimir Davydov <vdavydov@parallels.com>, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [patch 13/13] mm: memcontrol: rewrite uncharge API Date: Tue, 15 Jul 2014 14:19:35 +0200 [thread overview] Message-ID: <20140715121935.GB9366@dhcp22.suse.cz> (raw) In-Reply-To: <20140715082545.GA9366@dhcp22.suse.cz> [...] > +/** > + * mem_cgroup_migrate - migrate a charge to another page > + * @oldpage: currently charged page > + * @newpage: page to transfer the charge to > + * @lrucare: page might be on LRU already which one? I guess the newpage? > + * > + * Migrate the charge from @oldpage to @newpage. > + * > + * Both pages must be locked, @newpage->mapping must be set up. > + */ > +void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, > + bool lrucare) > +{ > + unsigned int nr_pages = 1; > + struct page_cgroup *pc; > + > + VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage); > + VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); > + VM_BUG_ON_PAGE(PageLRU(oldpage), oldpage); > + VM_BUG_ON_PAGE(PageLRU(newpage), newpage); VM_BUG_ON_PAGE(PageLRU(newpage) && !lruvec, newpage); > + VM_BUG_ON_PAGE(PageAnon(oldpage) != PageAnon(newpage), newpage); > + > + if (mem_cgroup_disabled()) > + return; > + > + pc = lookup_page_cgroup(oldpage); > + if (!PageCgroupUsed(pc)) > + return; > + > + /* Already migrated */ > + if (!(pc->flags & PCG_MEM)) > + return; > + > + VM_BUG_ON_PAGE(do_swap_account && !(pc->flags & PCG_MEMSW), oldpage); > + pc->flags &= ~(PCG_MEM | PCG_MEMSW); What about PCG_USED? Wouldn't we uncharge the currently transfered charge when oldpage does its last put_page when the migration is done? On a not directly related note. I was quite surprised to see that __unmap_and_move calls putback_lru_page on oldpage even when migration succeeded. So it goes through mem_cgroup_page_lruvec which checks PCG_USED and resets pc->mem_cgroup to root for !PCG_USED. > + > + if (PageTransHuge(oldpage)) { > + nr_pages <<= compound_order(oldpage); > + VM_BUG_ON_PAGE(!PageTransHuge(oldpage), oldpage); > + VM_BUG_ON_PAGE(!PageTransHuge(newpage), newpage); > + } > + > + commit_charge(newpage, pc->mem_cgroup, nr_pages, lrucare); > +} -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2014-07-15 12:19 UTC|newest] Thread overview: 141+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-06-18 20:40 [patch 00/13] mm: memcontrol: naturalize charge lifetime v4 Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 01/13] mm: memcontrol: fold mem_cgroup_do_charge() Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 02/13] mm: memcontrol: rearrange charging fast path Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 03/13] mm: memcontrol: reclaim at least once for __GFP_NORETRY Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 04/13] mm: huge_memory: use GFP_TRANSHUGE when charging huge pages Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 05/13] mm: memcontrol: retry reclaim for oom-disabled and __GFP_NOFAIL charges Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 06/13] mm: memcontrol: remove explicit OOM parameter in charge path Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 07/13] mm: memcontrol: simplify move precharge function Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 08/13] mm: memcontrol: catch root bypass in move precharge Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 09/13] mm: memcontrol: use root_mem_cgroup res_counter Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 10/13] mm: memcontrol: remove ordering between pc->mem_cgroup and PageCgroupUsed Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 11/13] mm: memcontrol: do not acquire page_cgroup lock for kmem pages Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-18 20:40 ` [patch 12/13] mm: memcontrol: rewrite charge API Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-23 6:15 ` Uwe Kleine-König 2014-06-23 6:15 ` Uwe Kleine-König 2014-06-23 6:15 ` Uwe Kleine-König 2014-06-23 9:30 ` Michal Hocko 2014-06-23 9:30 ` Michal Hocko 2014-06-23 9:30 ` Michal Hocko 2014-06-23 9:42 ` Uwe Kleine-König 2014-06-23 9:42 ` Uwe Kleine-König 2014-06-23 9:42 ` Uwe Kleine-König 2014-07-14 15:04 ` Michal Hocko 2014-07-14 15:04 ` Michal Hocko 2014-07-14 15:04 ` Michal Hocko 2014-07-14 17:13 ` Johannes Weiner 2014-07-14 17:13 ` Johannes Weiner 2014-07-14 18:43 ` Michal Hocko 2014-07-14 18:43 ` Michal Hocko 2014-06-18 20:40 ` [patch 13/13] mm: memcontrol: rewrite uncharge API Johannes Weiner 2014-06-18 20:40 ` Johannes Weiner 2014-06-20 16:36 ` [PATCH -mm] memcg: mem_cgroup_charge_statistics needs preempt_disable Michal Hocko 2014-06-20 16:36 ` Michal Hocko 2014-06-23 4:16 ` Johannes Weiner 2014-06-23 4:16 ` Johannes Weiner 2014-06-21 0:34 ` [patch 13/13] mm: memcontrol: rewrite uncharge API Sasha Levin 2014-06-21 0:34 ` Sasha Levin 2014-06-21 0:56 ` Andrew Morton 2014-06-21 0:56 ` Andrew Morton 2014-06-21 0:56 ` Andrew Morton 2014-06-21 1:03 ` Sasha Levin 2014-06-21 1:03 ` Sasha Levin 2014-07-15 8:25 ` Michal Hocko 2014-07-15 8:25 ` Michal Hocko 2014-07-15 8:25 ` Michal Hocko 2014-07-15 12:19 ` Michal Hocko [this message] 2014-07-15 12:19 ` Michal Hocko 2014-07-18 7:12 ` Michal Hocko 2014-07-18 7:12 ` Michal Hocko 2014-07-18 14:45 ` Johannes Weiner 2014-07-18 14:45 ` Johannes Weiner 2014-07-18 14:45 ` Johannes Weiner 2014-07-18 15:12 ` Miklos Szeredi 2014-07-18 15:12 ` Miklos Szeredi 2014-07-19 17:39 ` Johannes Weiner 2014-07-19 17:39 ` Johannes Weiner 2014-07-19 17:39 ` Johannes Weiner 2014-07-22 15:08 ` Michal Hocko 2014-07-22 15:08 ` Michal Hocko 2014-07-22 15:44 ` Miklos Szeredi 2014-07-22 15:44 ` Miklos Szeredi 2014-07-22 15:44 ` Miklos Szeredi 2014-07-23 14:38 ` Michal Hocko 2014-07-23 14:38 ` Michal Hocko 2014-07-23 14:38 ` Michal Hocko 2014-07-23 15:06 ` Johannes Weiner 2014-07-23 15:06 ` Johannes Weiner 2014-07-23 15:19 ` Michal Hocko 2014-07-23 15:19 ` Michal Hocko 2014-07-23 15:19 ` Michal Hocko 2014-07-23 15:36 ` Johannes Weiner 2014-07-23 15:36 ` Johannes Weiner 2014-07-23 18:08 ` Miklos Szeredi 2014-07-23 18:08 ` Miklos Szeredi 2014-07-23 21:02 ` Johannes Weiner 2014-07-23 21:02 ` Johannes Weiner 2014-07-23 21:02 ` Johannes Weiner 2014-07-24 8:46 ` Michal Hocko 2014-07-24 8:46 ` Michal Hocko 2014-07-24 9:02 ` Michal Hocko 2014-07-24 9:02 ` Michal Hocko 2014-07-24 9:02 ` Michal Hocko 2014-07-25 15:26 ` Johannes Weiner 2014-07-25 15:26 ` Johannes Weiner 2014-07-25 15:26 ` Johannes Weiner 2014-07-25 15:43 ` Michal Hocko 2014-07-25 15:43 ` Michal Hocko 2014-07-25 17:34 ` Johannes Weiner 2014-07-25 17:34 ` Johannes Weiner 2014-07-15 14:23 ` Michal Hocko 2014-07-15 14:23 ` Michal Hocko 2014-07-15 14:23 ` Michal Hocko 2014-07-15 15:09 ` Johannes Weiner 2014-07-15 15:09 ` Johannes Weiner 2014-07-15 15:18 ` Michal Hocko 2014-07-15 15:18 ` Michal Hocko 2014-07-15 15:46 ` Johannes Weiner 2014-07-15 15:46 ` Johannes Weiner 2014-07-15 15:56 ` Michal Hocko 2014-07-15 15:56 ` Michal Hocko 2014-07-15 15:55 ` Naoya Horiguchi 2014-07-15 15:55 ` Naoya Horiguchi 2014-07-15 16:07 ` Michal Hocko 2014-07-15 16:07 ` Michal Hocko 2014-07-15 17:34 ` Johannes Weiner 2014-07-15 17:34 ` Johannes Weiner 2014-07-15 17:34 ` Johannes Weiner 2014-07-15 18:21 ` Michal Hocko 2014-07-15 18:21 ` Michal Hocko 2014-07-15 18:21 ` Michal Hocko 2014-07-15 18:43 ` Naoya Horiguchi 2014-07-15 18:43 ` Naoya Horiguchi 2014-07-15 19:04 ` Johannes Weiner 2014-07-15 19:04 ` Johannes Weiner 2014-07-15 19:04 ` Johannes Weiner 2014-07-15 20:49 ` Naoya Horiguchi 2014-07-15 20:49 ` Naoya Horiguchi 2014-07-15 21:48 ` Johannes Weiner 2014-07-15 21:48 ` Johannes Weiner 2014-07-16 7:55 ` Michal Hocko 2014-07-16 7:55 ` Michal Hocko 2014-07-16 13:30 ` Naoya Horiguchi 2014-07-16 13:30 ` Naoya Horiguchi 2014-07-16 14:14 ` Johannes Weiner 2014-07-16 14:14 ` Johannes Weiner 2014-07-16 14:57 ` Naoya Horiguchi 2014-07-16 14:57 ` Naoya Horiguchi 2014-07-16 14:57 ` Naoya Horiguchi
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