From: Michal Hocko <mhocko@suse.cz>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [patch 4/8] mm: memcg: push !mm handling out to page cache charge function
Date: Wed, 12 Mar 2014 14:11:52 +0100 [thread overview]
Message-ID: <20140312131152.GC11831@dhcp22.suse.cz> (raw)
In-Reply-To: <1394587714-6966-5-git-send-email-hannes@cmpxchg.org>
On Tue 11-03-14 21:28:30, Johannes Weiner wrote:
[...]
> @@ -4070,6 +4061,12 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
> return 0;
>
> if (!PageSwapCache(page)) {
> + /*
> + * Page cache insertions can happen without an actual
> + * task context, e.g. during disk probing on boot.
We read a page cache during disk probing? I have tried to find such a
code path but failed. Could you point me to such a path, please?
I thought that such probing is done from udev context but I am not
familiar with this area TBH.
Thanks!
> + */
> + if (!mm)
> + memcg = root_mem_cgroup;
> ret = __mem_cgroup_try_charge(mm, gfp_mask, 1, &memcg, true);
> if (ret != -ENOMEM)
> __mem_cgroup_commit_charge(memcg, page, 1, type, false);
> --
> 1.9.0
>
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2014-03-12 13:11 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-12 1:28 [patch 0/8] memcg: charge path cleanups Johannes Weiner
2014-03-12 1:28 ` [patch 1/8] mm: memcg: remove unnecessary preemption disabling Johannes Weiner
2014-03-12 1:28 ` [patch 2/8] mm: memcg: remove mem_cgroup_move_account_page_stat() Johannes Weiner
2014-03-12 1:28 ` [patch 3/8] mm: memcg: inline mem_cgroup_charge_common() Johannes Weiner
2014-03-12 12:52 ` Michal Hocko
2014-03-12 14:53 ` Johannes Weiner
2014-03-12 15:19 ` Michal Hocko
2014-03-12 15:20 ` [PATCH] memcg: rename high level charging functions Michal Hocko
2014-03-12 1:28 ` [patch 4/8] mm: memcg: push !mm handling out to page cache charge function Johannes Weiner
2014-03-12 13:11 ` Michal Hocko [this message]
2014-03-12 14:56 ` Johannes Weiner
2014-03-12 15:01 ` Michal Hocko
2014-03-12 1:28 ` [patch 5/8] memcg: remove unnecessary !mm check from try_get_mem_cgroup_from_mm() Johannes Weiner
2014-03-12 1:28 ` [patch 6/8] memcg: get_mem_cgroup_from_mm() Johannes Weiner
2014-03-12 1:28 ` [patch 7/8] memcg: do not replicate get_mem_cgroup_from_mm in __mem_cgroup_try_charge Johannes Weiner
2014-03-12 1:28 ` [patch 8/8] memcg: sanitize __mem_cgroup_try_charge() call protocol Johannes Weiner
2014-03-12 14:01 ` Michal Hocko
2014-03-12 14:05 ` Michal Hocko
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