From: "Huang, Kai" <kai.huang@intel.com>
To: Haitao Huang <haitao.huang@linux.intel.com>,
"jarkko@kernel.org" <jarkko@kernel.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"tj@kernel.org" <tj@kernel.org>,
"mkoutny@suse.com" <mkoutny@suse.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-sgx@vger.kernel.org" <linux-sgx@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"cgroups@vger.kernel.org" <cgroups@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"bp@alien8.de" <bp@alien8.de>, "hpa@zytor.com" <hpa@zytor.com>,
"Mehta, Sohil" <sohil.mehta@intel.com>
Cc: "Li, Zhiquan1" <zhiquan1.li@intel.com>,
"kristen@linux.intel.com" <kristen@linux.intel.com>,
"seanjc@google.com" <seanjc@google.com>,
"Zhang, Bo" <zhanb@microsoft.com>,
"anakrish@microsoft.com" <anakrish@microsoft.com>,
"mikko.ylinen@linux.intel.com" <mikko.ylinen@linux.intel.com>,
"yangjie@microsoft.com" <yangjie@microsoft.com>,
"chrisyan@microsoft.com" <chrisyan@microsoft.com>
Subject: RE: [PATCH v8 07/15] x86/sgx: Expose sgx_reclaim_pages() for cgroup
Date: Tue, 30 Jan 2024 15:39:44 +0000 [thread overview]
Message-ID: <BL1PR11MB5978A8E4B6E1DC4CC0159FD0F77D2@BL1PR11MB5978.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20240130020938.10025-8-haitao.huang@linux.intel.com>
> + * @lru: The LRU from which pages are reclaimed.
> + * @nr_to_scan: Pointer to the target number of pages to scan, must be less
> than
> + * SGX_NR_TO_SCAN.
> + * Return: Number of pages reclaimed.
> */
> -static void sgx_reclaim_pages(void)
> +unsigned int sgx_reclaim_pages(struct sgx_epc_lru_list *lru, unsigned
> +int *nr_to_scan)
Since the function is now returning the number of reclaimed pages, why do you need to make the @nr_to_scan as pointer?
Cannot the caller just adjust @nr_to_scan when calling this function based on how many pages have reclaimed?
I am not even sure whether you need @nr_to_scan at all because as we discussed I think it's just extremely rare you need to pass "< SGX_NR_TO_SCAN" to this function.
Even if you need, you can always choose to try to reclaim SGX_NR_TO_SCAN pages.
[...]
>
> +static void sgx_reclaim_pages_global(void) {
> + unsigned int nr_to_scan = SGX_NR_TO_SCAN;
> +
> + sgx_reclaim_pages(&sgx_global_lru, &nr_to_scan); }
> +
I think this function doesn't look sane at all when you have @nr_to_scan being a pointer?
I am also not sure whether this function is needed -- if we don't add @nr_to_scan to sgx_reclaim_pages(), then this function is basically:
sgx_reclaim_pages(&sgx_global_lru);
next prev parent reply other threads:[~2024-01-30 15:39 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-30 2:09 [PATCH v8 00/15] Add Cgroup support for SGX EPC memory Haitao Huang
2024-01-30 2:09 ` [PATCH v8 01/15] cgroup/misc: Add per resource callbacks for CSS events Haitao Huang
2024-02-01 23:24 ` Jarkko Sakkinen
2024-02-02 16:34 ` Haitao Huang
2024-02-02 17:02 ` Tejun Heo
2024-02-12 19:31 ` Jarkko Sakkinen
2024-01-30 2:09 ` [PATCH v8 02/15] cgroup/misc: Export APIs for SGX driver Haitao Huang
2024-01-30 2:09 ` [PATCH v8 03/15] cgroup/misc: Add SGX EPC resource type Haitao Huang
2024-01-30 2:09 ` [PATCH v8 04/15] x86/sgx: Implement basic EPC misc cgroup functionality Haitao Huang
2024-01-30 15:22 ` Huang, Kai
2024-01-31 1:59 ` Haitao Huang
2024-02-01 23:27 ` Jarkko Sakkinen
2024-01-30 2:09 ` [PATCH v8 05/15] x86/sgx: Add sgx_epc_lru_list to encapsulate LRU list Haitao Huang
2024-02-01 23:28 ` Jarkko Sakkinen
2024-02-02 16:52 ` Haitao Huang
2024-01-30 2:09 ` [PATCH v8 06/15] x86/sgx: Abstract tracking reclaimable pages in LRU Haitao Huang
2024-02-01 23:29 ` Jarkko Sakkinen
2024-01-30 2:09 ` [PATCH v8 07/15] x86/sgx: Expose sgx_reclaim_pages() for cgroup Haitao Huang
2024-01-30 15:39 ` Huang, Kai [this message]
2024-01-31 1:35 ` Haitao Huang
2024-02-01 23:37 ` Jarkko Sakkinen
2024-01-30 2:09 ` [PATCH v8 08/15] x86/sgx: Implement EPC reclamation flows " Haitao Huang
2024-02-01 23:39 ` Jarkko Sakkinen
2024-01-30 2:09 ` [PATCH v8 09/15] x86/sgx: Charge mem_cgroup for per-cgroup reclamation Haitao Huang
2024-01-30 2:09 ` [PATCH v8 10/15] x86/sgx: Add EPC reclamation in cgroup try_charge() Haitao Huang
2024-01-30 2:09 ` [PATCH v8 11/15] x86/sgx: Abstract check for global reclaimable pages Haitao Huang
2024-01-30 2:09 ` [PATCH v8 12/15] x86/sgx: Expose sgx_epc_cgroup_reclaim_pages() for global reclaimer Haitao Huang
2024-01-30 2:09 ` [PATCH v8 13/15] x86/sgx: Turn on per-cgroup EPC reclamation Haitao Huang
2024-01-30 2:09 ` [PATCH v8 14/15] Docs/x86/sgx: Add description for cgroup support Haitao Huang
2024-01-30 2:09 ` [PATCH v8 15/15] selftests/sgx: Add scripts for EPC cgroup testing Haitao Huang
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