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bh=jHSce+q5MjsDAgQbyi7uaNk3h/+HF3xzKrNAxfo4btM=; b=J/rebweo0izsGCO/aghdtHTB2h42ZI6mRGY+GWnkfNYif56a+Kvau6+P sl2mpogGoo/uRBD65+v94G1/Y4UKOaGHLj5kfrsdLyKOvTMqVP+UW59Z4 W5WETM0/JFpEroBdyS1S1hPrMmdAALzxErsLhrrWRMY74J/3e70Sq5yeS WiiVP0KE48zJ1vcpIFD9sQQ0lII601RLW59vwRmdbnm76jEACW73u97gl mWNo17OckNjAidU8mv4Mxk9xB2IrxoSI6JiyRmOj2N7Dk2MHDuLTVB/En FpSQcJwA/cD9YJPOEdaiKbj5j7gq/V1Gm+VKyLkrZ0Y9xZNX+wmchrW8+ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10995"; a="3789553" X-IronPort-AV: E=Sophos;i="6.06,185,1705392000"; d="scan'208";a="3789553" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2024 06:04:56 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,185,1705392000"; d="scan'208";a="37468062" Received: from dukhanki-mobl.amr.corp.intel.com (HELO [10.209.30.102]) ([10.209.30.102]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2024 06:04:54 -0800 Message-ID: Date: Mon, 26 Feb 2024 06:04:54 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 10/15] x86/sgx: Add EPC reclamation in cgroup try_charge() Content-Language: en-US To: "Huang, Kai" , "tj@kernel.org" , "jarkko@kernel.org" , "x86@kernel.org" , "dave.hansen@linux.intel.com" , "cgroups@vger.kernel.org" , "hpa@zytor.com" , "mingo@redhat.com" , "tim.c.chen@linux.intel.com" , "mkoutny@suse.com" , "Mehta, Sohil" , "haitao.huang@linux.intel.com" , "linux-sgx@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "bp@alien8.de" Cc: "mikko.ylinen@linux.intel.com" , "seanjc@google.com" , "anakrish@microsoft.com" , "Zhang, Bo" , "kristen@linux.intel.com" , "yangjie@microsoft.com" , "Li, Zhiquan1" , "chrisyan@microsoft.com" References: <20240205210638.157741-1-haitao.huang@linux.intel.com> <20240205210638.157741-11-haitao.huang@linux.intel.com> <4db8493b-35a2-474f-997c-5e6ac1b8bd11@intel.com> <7b53e155-2622-4acb-b7c9-d22e623e4cb3@intel.com> <48faaea8b24f032baa6a858a2909a5b4ace769c6.camel@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/26/24 03:36, Huang, Kai wrote: >> In case of overcomitting, even if we always reclaim from the same cgroup >> for each fault, one group may still interfere the other: e.g., consider an >> extreme case in that group A used up almost all EPC at the time group B >> has a fault, B has to fail allocation and kill enclaves. > If the admin allows group A to use almost all EPC, to me it's fair to say he/she > doesn't want to run anything inside B at all and it is acceptable enclaves in B > to be killed. Folks, I'm having a really hard time following this thread. It sounds like there's disagreement about when to do system-wide reclaim. Could someone remind me of the choices that we have? (A proposed patch would go a _long_ way to helping me understand) Also, what does the core mm memcg code do? Last, what is the simplest (least amount of code) thing that the SGX cgroup controller could implement here?