Messages in this thread | | | Date | Sun, 24 May 2015 17:24:40 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH 11/51] memcg: implement mem_cgroup_css_from_page() |
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Hello,
On Fri, May 22, 2015 at 07:28:31PM -0400, Johannes Weiner wrote: > replace_page_cache() can clear page->mem_cgroup even when the page > still has references, so unfortunately you must hold the page lock > when calling this function. > > I haven't checked how you use this - chances are you always have the > page locked anyways - but it probably needs a comment.
Hmmm... as replace_page_cache_page() is used only by fuse and fuse's bdi doesn't go through the usual writeback accounting which is necessary for cgroup writeback support anyway, so I don't think this presents an actual problem. I'll add a warning in replace_page_cache_page() which triggers when it's used on a bdi which has cgroup writeback enabled and add comments explaining what's going on.
Thanks.
-- tejun
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