On Thu 01-04-21 21:59:13, Muchun Song wrote:
> On Thu, Apr 1, 2021 at 6:26 PM Michal Hocko wrote:
[...]
> > Even if the css ref count is not really necessary it shouldn't cause any
> > harm and it makes the code easier to understand. At least a comment
> > explaining why that is not necessary
On Thu, Apr 1, 2021 at 10:37 PM Michal Hocko wrote:
>
> On Thu 01-04-21 21:59:13, Muchun Song wrote:
> > On Thu, Apr 1, 2021 at 6:26 PM Michal Hocko wrote:
> [...]
> > > Even if the css ref count is not really necessary it shouldn't cause any
> > > harm and it makes the code easier to
On Thu, Apr 1, 2021 at 6:26 PM Michal Hocko wrote:
>
> On Thu 01-04-21 17:33:43, Muchun Song wrote:
> > The caller of wb_get_create() should pin the memcg, because
> > wb_get_create() relies on this guarantee. The rcu read lock
> > only can guarantee that the memcg css returned by css_from_id()
>
On Thu 01-04-21 17:33:43, Muchun Song wrote:
> The caller of wb_get_create() should pin the memcg, because
> wb_get_create() relies on this guarantee. The rcu read lock
> only can guarantee that the memcg css returned by css_from_id()
> cannot be released, but the reference of the memcg can be
The caller of wb_get_create() should pin the memcg, because
wb_get_create() relies on this guarantee. The rcu read lock
only can guarantee that the memcg css returned by css_from_id()
cannot be released, but the reference of the memcg can be zero.
Fix it by holding a reference to the css before
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