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Date: Mon, 12 Feb 2024 21:58:57 +0200
Message-Id: <CZ3D7JMQC1PK.3PRW2YCMLE3G5@kernel.org>
Subject: Re: [PATCH v9 12/15] x86/sgx: Expose sgx_epc_cgroup_reclaim_pages()
 for global reclaimer
From: "Jarkko Sakkinen" <jarkko@kernel.org>
To: "Haitao Huang" <haitao.huang@linux.intel.com>,
 <dave.hansen@linux.intel.com>, <tj@kernel.org>, <mkoutny@suse.com>,
 <linux-kernel@vger.kernel.org>, <linux-sgx@vger.kernel.org>,
 <x86@kernel.org>, <cgroups@vger.kernel.org>, <tglx@linutronix.de>,
 <mingo@redhat.com>, <bp@alien8.de>, <hpa@zytor.com>,
 <sohil.mehta@intel.com>, <tim.c.chen@linux.intel.com>
Cc: <zhiquan1.li@intel.com>, <kristen@linux.intel.com>, <seanjc@google.com>,
 <zhanb@microsoft.com>, <anakrish@microsoft.com>,
 <mikko.ylinen@linux.intel.com>, <yangjie@microsoft.com>,
 <chrisyan@microsoft.com>
References: <20240205210638.157741-1-haitao.huang@linux.intel.com>
 <20240205210638.157741-13-haitao.huang@linux.intel.com>
In-Reply-To: <20240205210638.157741-13-haitao.huang@linux.intel.com>

On Mon Feb 5, 2024 at 11:06 PM EET, Haitao Huang wrote:
> From: Kristen Carlson Accardi <kristen@linux.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@intel.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
> Co-developed-by: Haitao Huang <haitao.huang@linux.intel.com>
> Signed-off-by: Haitao Huang <haitao.huang@linux.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/s=
gx/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, b=
ool indirect)
> +unsigned int sgx_epc_cgroup_reclaim_pages(struct misc_cg *root, bool ind=
irect)

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