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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