On Thu, 2022-12-08 at 15:31 +0000, Jarkko Sakkinen wrote:
> On Fri, Dec 02, 2022 at 10:36:39AM -0800, Kristen Carlson Accardi
> wrote:
> > Introduce a data structure to wrap the existing reclaimable list
> > and its spinlock in a struct to minimize the code changes needed
> > to handle multiple LRUs as well as reclaimable and non-reclaimable
> > lists, both of which will be introduced and used by SGX EPC
> > cgroups.
> >
> > Signed-off-by: Sean Christopherson
> > <sean.j.christopherson@xxxxxxxxx>
> > Signed-off-by: Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx>
> > Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
> > ---
> > arch/x86/kernel/cpu/sgx/sgx.h | 65
> > +++++++++++++++++++++++++++++++++++
> > 1 file changed, 65 insertions(+)
> >
> > diff --git a/arch/x86/kernel/cpu/sgx/sgx.h
> > b/arch/x86/kernel/cpu/sgx/sgx.h
> > index 39cb15a8abcb..5e6d88438fae 100644
> > --- a/arch/x86/kernel/cpu/sgx/sgx.h
> > +++ b/arch/x86/kernel/cpu/sgx/sgx.h
> > @@ -90,6 +90,71 @@ static inline void *sgx_get_epc_virt_addr(struct
> > sgx_epc_page *page)
> > return section->virt_addr + index * PAGE_SIZE;
> > }
> >
> > +/*
> > + * This data structure wraps a list of reclaimable EPC pages, and
> > a list of
> > + * non-reclaimable EPC pages and is used to implement a LRU policy
> > during
> > + * reclamation.
> > + */
> > +struct sgx_epc_lru_lists {
> > + spinlock_t lock;
> > + struct list_head reclaimable;
> > + struct list_head unreclaimable;
> > +};
>
> Why this is named like this, and not sgx_epc_global_rcu? Are there
> any other use cases?
>
> BR, Jarkko
Yes, there are other use cases that are introduced in the other
patches. This structure is used to in the cgroup struct to hold cgroup
specific LRUs.
