From patchwork Wed Aug 21 01:54:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haitao Huang X-Patchwork-Id: 13770707 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 31BC614F13D; Wed, 21 Aug 2024 01:54:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724205272; cv=none; b=eYnfD6iLP7bJB+2btiH9t413PrGPgMvR0HXPW1DKddus5iYdBL+R/6XOa9FTGh+md5KeArUin4TdtMVZMdNUXNCQRxfucDlTJpqBeh6fk4UPj2MhkmcYnxqNqe3nK3VRSA2bq8kVnFLjlBOHfCeLCb5fSCxI78z/GTyK8Pl0/TM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724205272; c=relaxed/simple; bh=ZdDKXWLL6fJHykCIgSD/hWSzJVp4jZ7dPn4jVPHmnK0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jsFOHgdq5dpi+PnbNTuNEFoPFH02UDr8ufyoFFVr1D2XsRQ6038F5HSFbuU+TDXqg7pUBpE2e5IqEUbfi7Yp1eNRo3hNUWN9QGBMclJ4HFTWpFIL2dHQyckh3QfgFEpCG+6LHcrbsIaItlZcn6UqF/y/nGzd9qpAU31/xosQsYM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Q1WJlzsA; arc=none smtp.client-ip=198.175.65.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Q1WJlzsA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724205270; x=1755741270; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ZdDKXWLL6fJHykCIgSD/hWSzJVp4jZ7dPn4jVPHmnK0=; b=Q1WJlzsAKQevoZWjrYBe2d8zLGcqnetb1t8Gy9xdYesH3pXWxYX0y5u9 530+4HDASmR8hhp/KzsTYDv6LeXYUHnnLfqBPn7qMIaoNKCc06UFlvXFA sWMKoS4A8YkWoWWakUJZWC8GzDYZ16bb0PSFAwGCoj1SIOhT0K0+1ViKt BGbAiTefvid88yMfszWo9dYsAMvxfwvYgDvb6JJaL9QoDP60ziNzOV21e 0pYhlzB/MVaLyYvdiI1Xk5TcV2/lbqzunXQLtRwTVVOfokVzBOBlRt8nt xpMeQR2ghh5LYntuF4G3A5aU8gZX34mvSLJ4YeGEOp6YEgMOyr2Jjc4Qj Q==; X-CSE-ConnectionGUID: guk49F9DT1OJZ0+NyQkH4A== X-CSE-MsgGUID: PB9PIKh1T6CHPX9gPQHtPA== X-IronPort-AV: E=McAfee;i="6700,10204,11170"; a="33107968" X-IronPort-AV: E=Sophos;i="6.10,163,1719903600"; d="scan'208";a="33107968" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2024 18:54:23 -0700 X-CSE-ConnectionGUID: RyifEbjKSqeAcFhoN7bWjA== X-CSE-MsgGUID: BPCC5zURQuW9oVZQoacxeg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,163,1719903600"; d="scan'208";a="61078623" Received: from b4969164b36c.jf.intel.com ([10.165.59.5]) by fmviesa010.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2024 18:54:22 -0700 From: Haitao Huang To: jarkko@kernel.org, dave.hansen@linux.intel.com, kai.huang@intel.com, tj@kernel.org, mkoutny@suse.com, chenridong@huawei.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 Subject: [PATCH v16 14/16] x86/sgx: Turn on per-cgroup EPC reclamation Date: Tue, 20 Aug 2024 18:54:02 -0700 Message-ID: <20240821015404.6038-15-haitao.huang@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240821015404.6038-1-haitao.huang@linux.intel.com> References: <20240821015404.6038-1-haitao.huang@linux.intel.com> Precedence: bulk X-Mailing-List: linux-sgx@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Kristen Carlson Accardi Previous patches have implemented all infrastructure needed for per-cgroup EPC page tracking and reclaiming. But all reclaimable EPC pages are still tracked in the global LRU as sgx_epc_page_lru() always returns reference to the global LRU. Change sgx_epc_page_lru() to return the LRU of the cgroup in which the given EPC page is allocated. Update sgx_can_reclaim_global(), to check emptiness of LRUs of all cgroups, and update sgx_reclaim_pages_global(), to utilize sgx_cgroup_reclaim_pages_global(), when EPC cgroup is enabled. With these changes, the global reclamation and per-cgroup reclamation both work properly with all pages tracked in per-cgroup LRUs. Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson Signed-off-by: Kristen Carlson Accardi Co-developed-by: Haitao Huang Signed-off-by: Haitao Huang Reviewed-by: Jarkko Sakkinen Reviewed-by: Kai Huang --- V16: - Separated out the global and direct reclamation to earlier patch.(Kai) V14: - Update global reclamation to use the new sgx_cgroup_reclaim_pages() to iterate cgroups at lower level if the top cgroups are too busy. V13: - Use IS_ENABLED(CONFIG_CGROUP_MISC) in sgx_can_reclaim_global(). (Kai) V12: - Remove CONFIG_CGROUP_SGX_EPC, conditional compile SGX Cgroup for CONFIGCONFIG_CGROUPMISC. (Jarkko) V11: - Reword the comments for global reclamation for allocation failure after passing cgroup charging. (Kai) - Add stub functions to remove ifdefs in c file (Kai) - Add more detailed comments to clarify each page belongs to one cgroup, or the root. (Kai) V10: - Add comment to clarify each page belongs to one cgroup, or the root by default. (Kai) - Merge the changes that expose sgx_cgroup_* functions to this patch. - Add changes for sgx_reclaim_direct() that was missed previously. 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 | 6 ++++ arch/x86/kernel/cpu/sgx/main.c | 45 ++++++++++++++++++---------- 3 files changed, 36 insertions(+), 17 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/epc_cgroup.c b/arch/x86/kernel/cpu/sgx/epc_cgroup.c index b7d60b2d878d..c3f0c7bc13c6 100644 --- a/arch/x86/kernel/cpu/sgx/epc_cgroup.c +++ b/arch/x86/kernel/cpu/sgx/epc_cgroup.c @@ -162,7 +162,7 @@ static inline u64 sgx_cgroup_max_pages_to_root(struct sgx_cgroup *sgx_cg) * * Return: %true if all cgroups under the specified root have empty LRU lists. */ -static bool sgx_cgroup_lru_empty(struct misc_cg *root) +bool sgx_cgroup_lru_empty(struct misc_cg *root) { struct cgroup_subsys_state *css_root; struct cgroup_subsys_state *pos; diff --git a/arch/x86/kernel/cpu/sgx/epc_cgroup.h b/arch/x86/kernel/cpu/sgx/epc_cgroup.h index cf2b946d993e..cd957cf38204 100644 --- a/arch/x86/kernel/cpu/sgx/epc_cgroup.h +++ b/arch/x86/kernel/cpu/sgx/epc_cgroup.h @@ -27,6 +27,11 @@ static inline int sgx_cgroup_try_charge(struct sgx_cgroup *sgx_cg, enum sgx_recl static inline void sgx_cgroup_uncharge(struct sgx_cgroup *sgx_cg) { } +static inline bool sgx_cgroup_lru_empty(struct misc_cg *root) +{ + return true; +} + static inline int __init sgx_cgroup_init(void) { return 0; @@ -91,6 +96,7 @@ static inline void sgx_put_cg(struct sgx_cgroup *sgx_cg) int sgx_cgroup_try_charge(struct sgx_cgroup *sgx_cg, enum sgx_reclaim reclaim); void sgx_cgroup_uncharge(struct sgx_cgroup *sgx_cg); +bool sgx_cgroup_lru_empty(struct misc_cg *root); void sgx_cgroup_reclaim_pages_global(struct mm_struct *charge_mm); void sgx_cgroup_reclaim_direct(void); int __init sgx_cgroup_init(void); diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 9a8f91ebd21b..2a23a10d882e 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -32,9 +32,30 @@ static DEFINE_XARRAY(sgx_epc_address_space); */ static struct sgx_epc_lru_list sgx_global_lru; +/* + * Get the per-cgroup or global LRU list that tracks the given reclaimable page. + */ static inline struct sgx_epc_lru_list *sgx_epc_page_lru(struct sgx_epc_page *epc_page) { +#ifdef CONFIG_CGROUP_MISC + /* + * epc_page->sgx_cg here is never NULL during a reclaimable epc_page's + * life between sgx_alloc_epc_page() and sgx_free_epc_page(): + * + * In sgx_alloc_epc_page(), epc_page->sgx_cg is set to the return from + * sgx_get_current_cg() which is the misc cgroup of the current task, or + * the root by default even if the misc cgroup is disabled by kernel + * command line. + * + * epc_page->sgx_cg is only unset by sgx_free_epc_page(). + * + * This function is never used before sgx_alloc_epc_page() or after + * sgx_free_epc_page(). + */ + return &epc_page->sgx_cg->lru; +#else return &sgx_global_lru; +#endif } /* @@ -42,14 +63,10 @@ static inline struct sgx_epc_lru_list *sgx_epc_page_lru(struct sgx_epc_page *epc */ static inline bool sgx_can_reclaim_global(void) { - /* - * Now all EPC pages are still tracked in the @sgx_global_lru, so only - * check @sgx_global_lru. - * - * When EPC pages are tracked in the actual per-cgroup LRUs, - * replace with sgx_cgroup_lru_empty(misc_cg_root()). - */ - return !list_empty(&sgx_global_lru.reclaimable); + if (IS_ENABLED(CONFIG_CGROUP_MISC)) + return !sgx_cgroup_lru_empty(misc_cg_root()); + else + return !list_empty(&sgx_global_lru.reclaimable); } static atomic_long_t sgx_nr_free_pages = ATOMIC_LONG_INIT(0); @@ -411,14 +428,10 @@ static bool sgx_should_reclaim_global(unsigned long watermark) static void sgx_reclaim_pages_global(struct mm_struct *charge_mm) { - /* - * Now all EPC pages are still tracked in the @sgx_global_lru. - * Still reclaim from it. - * - * When EPC pages are tracked in the actual per-cgroup LRUs, - * sgx_cgroup_reclaim_pages_global() will be called. - */ - sgx_reclaim_pages(&sgx_global_lru, charge_mm); + if (IS_ENABLED(CONFIG_CGROUP_MISC)) + sgx_cgroup_reclaim_pages_global(charge_mm); + else + sgx_reclaim_pages(&sgx_global_lru, charge_mm); } /*