linux-kernel - Re: [PATCH v7 12/15] x86/sgx: Expose sgx_epc_cgroup_reclaim

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Date: Mon, 22 Jan 2024 22:31:53 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Haitao Huang" <haitao.huang@...ux.intel.com>,
 <dave.hansen@...ux.intel.com>, <tj@...nel.org>, <mkoutny@...e.com>,
 <linux-kernel@...r.kernel.org>, <linux-sgx@...r.kernel.org>,
 <x86@...nel.org>, <cgroups@...r.kernel.org>, <tglx@...utronix.de>,
 <mingo@...hat.com>, <bp@...en8.de>, <hpa@...or.com>,
 <sohil.mehta@...el.com>
Cc: <zhiquan1.li@...el.com>, <kristen@...ux.intel.com>, <seanjc@...gle.com>,
 <zhanb@...rosoft.com>, <anakrish@...rosoft.com>,
 <mikko.ylinen@...ux.intel.com>, <yangjie@...rosoft.com>
Subject: Re: [PATCH v7 12/15] x86/sgx: Expose sgx_epc_cgroup_reclaim_pages()
 for global reclaimer

On Mon Jan 22, 2024 at 7:20 PM EET, Haitao Huang wrote:
> From: Kristen Carlson Accardi <kristen@...ux.intel.com>
>
> When cgroup is enabled, all reclaimable pages will be tracked in cgroup
> LRUs. The global reclaimer needs to start reclamation from the root
> cgroup. Expose the top level cgroup reclamation function so the global
> reclaimer can reuse it.
>
> Co-developed-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
> Co-developed-by: Haitao Huang <haitao.huang@...ux.intel.com>
> Signed-off-by: Haitao Huang <haitao.huang@...ux.intel.com>
> ---
> V7:
> - Split this out from the big patch, #10 in V6. (Dave, Kai)
> ---
>  arch/x86/kernel/cpu/sgx/epc_cgroup.c | 2 +-
>  arch/x86/kernel/cpu/sgx/epc_cgroup.h | 9 +++++++++
>  2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/cpu/sgx/epc_cgroup.c b/arch/x86/kernel/cpu/sgx/epc_cgroup.c
> index c28ed12ff864..fdf1417d9ade 100644
> --- a/arch/x86/kernel/cpu/sgx/epc_cgroup.c
> +++ b/arch/x86/kernel/cpu/sgx/epc_cgroup.c
> @@ -88,7 +88,7 @@ bool sgx_epc_cgroup_lru_empty(struct misc_cg *root)
>   * @indirect:   In ksgxd or EPC cgroup work queue context.
>   * Return:	Number of pages reclaimed.
>   */
> -static unsigned int sgx_epc_cgroup_reclaim_pages(struct misc_cg *root, bool indirect)
> +unsigned int sgx_epc_cgroup_reclaim_pages(struct misc_cg *root, bool indirect)
>  {
>  	/*
>  	 * Attempting to reclaim only a few pages will often fail and is inefficient, while
> diff --git a/arch/x86/kernel/cpu/sgx/epc_cgroup.h b/arch/x86/kernel/cpu/sgx/epc_cgroup.h
> index 6e156de5f7ff..05a4de9f7024 100644
> --- a/arch/x86/kernel/cpu/sgx/epc_cgroup.h
> +++ b/arch/x86/kernel/cpu/sgx/epc_cgroup.h
> @@ -31,6 +31,12 @@ static inline int sgx_epc_cgroup_try_charge(struct sgx_epc_cgroup *epc_cg, bool
>  static inline void sgx_epc_cgroup_uncharge(struct sgx_epc_cgroup *epc_cg) { }
>  
>  static inline void sgx_epc_cgroup_init(void) { }
> +
> +static inline unsigned int sgx_epc_cgroup_reclaim_pages(struct misc_cg *root,
> +							bool indirect)
> +{
> +	return 0;
> +}
>  #else
>  struct sgx_epc_cgroup {
>  	struct misc_cg			*cg;
> @@ -69,6 +75,9 @@ static inline void sgx_put_epc_cg(struct sgx_epc_cgroup *epc_cg)
>  int sgx_epc_cgroup_try_charge(struct sgx_epc_cgroup *epc_cg, bool reclaim);
>  void sgx_epc_cgroup_uncharge(struct sgx_epc_cgroup *epc_cg);
>  bool sgx_epc_cgroup_lru_empty(struct misc_cg *root);
> +unsigned int sgx_epc_cgroup_reclaim_pages(struct misc_cg *root,
> +					  bool indirect);

Here, on the other hand, you could put the whole declaration to single
line.

> +
>  void sgx_epc_cgroup_init(void);
>  
>  #endif

BR, Jarkko