From: Michal Hocko <mhocko@kernel.org> To: Minchan Kim <minchan@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org>, "Kirill A. Shutemov" <kirill@shutemov.name>, Johannes Weiner <hannes@cmpxchg.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: memcg uncharge page counter mismatch Date: Thu, 3 Dec 2015 16:47:29 +0100 [thread overview] Message-ID: <20151203154729.GI9264@dhcp22.suse.cz> (raw) In-Reply-To: <20151203145850.GH9264@dhcp22.suse.cz> On Thu 03-12-15 15:58:50, Michal Hocko wrote: [....] > Warning, this looks ugly as hell. I was thinking about it some more and it seems that we should rather not bother with partial thp at all and keep it in the original memcg instead. It is way much less code and I do not think this will be too disruptive. Somebody should be holding the thp head, right? Minchan, does this fix the issue you are seeing. --- diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 79a29d564bff..143c933f0b81 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4895,6 +4895,14 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, switch (get_mctgt_type(vma, addr, ptent, &target)) { case MC_TARGET_PAGE: page = target.page; + /* + * We can have a part of the split pmd here. Moving it + * can be done but it would be too convoluted so simply + * ignore such a partial THP and keep it in original + * memcg. There should be somebody mapping the head. + */ + if (PageCompound(page)) + goto put; if (isolate_lru_page(page)) goto put; if (!mem_cgroup_move_account(page, false, -- Michal Hocko SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org> To: Minchan Kim <minchan@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org>, "Kirill A. Shutemov" <kirill@shutemov.name>, Johannes Weiner <hannes@cmpxchg.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: memcg uncharge page counter mismatch Date: Thu, 3 Dec 2015 16:47:29 +0100 [thread overview] Message-ID: <20151203154729.GI9264@dhcp22.suse.cz> (raw) In-Reply-To: <20151203145850.GH9264@dhcp22.suse.cz> On Thu 03-12-15 15:58:50, Michal Hocko wrote: [....] > Warning, this looks ugly as hell. I was thinking about it some more and it seems that we should rather not bother with partial thp at all and keep it in the original memcg instead. It is way much less code and I do not think this will be too disruptive. Somebody should be holding the thp head, right? Minchan, does this fix the issue you are seeing. --- diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 79a29d564bff..143c933f0b81 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4895,6 +4895,14 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, switch (get_mctgt_type(vma, addr, ptent, &target)) { case MC_TARGET_PAGE: page = target.page; + /* + * We can have a part of the split pmd here. Moving it + * can be done but it would be too convoluted so simply + * ignore such a partial THP and keep it in original + * memcg. There should be somebody mapping the head. + */ + if (PageCompound(page)) + goto put; if (isolate_lru_page(page)) goto put; if (!mem_cgroup_move_account(page, false, -- 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:[~2015-12-03 15:47 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-12-01 13:34 memcg uncharge page counter mismatch Minchan Kim 2015-12-01 13:34 ` Minchan Kim 2015-12-02 10:16 ` Michal Hocko 2015-12-02 10:16 ` Michal Hocko 2015-12-03 1:34 ` Minchan Kim 2015-12-03 1:34 ` Minchan Kim 2015-12-03 2:10 ` Minchan Kim 2015-12-03 2:10 ` Minchan Kim 2015-12-03 8:54 ` Michal Hocko 2015-12-03 8:54 ` Michal Hocko 2015-12-03 12:59 ` Minchan Kim 2015-12-03 12:59 ` Minchan Kim 2015-12-03 13:37 ` Michal Hocko 2015-12-03 13:37 ` Michal Hocko 2015-12-03 13:43 ` Michal Hocko 2015-12-03 13:43 ` Michal Hocko 2015-12-03 14:58 ` Michal Hocko 2015-12-03 14:58 ` Michal Hocko 2015-12-03 15:47 ` Michal Hocko [this message] 2015-12-03 15:47 ` Michal Hocko 2015-12-04 5:35 ` Minchan Kim 2015-12-04 5:35 ` Minchan Kim 2015-12-04 8:52 ` Michal Hocko 2015-12-04 8:52 ` Michal Hocko 2015-12-04 9:16 ` Minchan Kim 2015-12-04 9:16 ` Minchan Kim 2015-12-04 9:58 ` Michal Hocko 2015-12-04 9:58 ` Michal Hocko 2015-12-04 13:35 ` Minchan Kim 2015-12-04 13:35 ` Minchan Kim 2015-12-04 16:01 ` Johannes Weiner 2015-12-04 16:01 ` Johannes Weiner
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