linux-kernel - Re: [PATCH v9 12/15] x86/sgx: Expose sgx_epc_cgroup_reclaim

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Message-Id: <CZ3D7JMQC1PK.3PRW2YCMLE3G5@kernel.org>
Date: Mon, 12 Feb 2024 21:58:57 +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>, <tim.c.chen@...ux.intel.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>,
 <chrisyan@...rosoft.com>
Subject: Re: [PATCH v9 12/15] x86/sgx: Expose sgx_epc_cgroup_reclaim_pages()
 for global reclaimer

On Mon Feb 5, 2024 at 11:06 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>
> ---
> V8:
> - Remove unneeded breaks in function declarations. (Jarkko)
>
> 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 | 7 +++++++
>  2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/cpu/sgx/epc_cgroup.c b/arch/x86/kernel/cpu/sgx/epc_cgroup.c
> index abf74fdb12b4..6e31f8727b8a 100644
> --- a/arch/x86/kernel/cpu/sgx/epc_cgroup.c
> +++ b/arch/x86/kernel/cpu/sgx/epc_cgroup.c
> @@ -96,7 +96,7 @@ 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)

Now that is an ugly function name...

IMHO, be would not lost a lot of information if these would be shortened
as sgx_cgroup_reclaim_pages() and such and so forth.

No risk for amiguity and much much more digestable code to read.

BR, Jarkko