From patchwork Tue Aug 30 21:49:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 12959963 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E4F2ECAAA1 for ; Tue, 30 Aug 2022 21:51:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231958AbiH3Vvy (ORCPT ); Tue, 30 Aug 2022 17:51:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231959AbiH3VvI (ORCPT ); Tue, 30 Aug 2022 17:51:08 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9578186FA for ; Tue, 30 Aug 2022 14:50:00 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-33dbfb6d2a3so188944177b3.11 for ; Tue, 30 Aug 2022 14:50:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc; bh=lEzLHp5EUALGBDR080eL/ZTXye/B6ScLofp8WoGZutw=; b=b1R/0Nzef/8svLYP03pWrgs7vVHFpmq4XPsUT6SPRcEERNTFUBKXL3gF3rV3lAxbCu zXGaLab/bgugeQVtB6fQn7BhC15GHiYy8yfVXRL4GYXQsnil0/qsZR4erD7n1daSxUT/ hbKk1xyU9Ykc1njB28pQzjTGt5yf81XdbMvnJj3jJrZZVKL0FDy5ZPsMSVZCq6qj2GNq 5xqR3jFoEpuD7VZT5PIkQzsQQ7XeVpMK6yxsDE98VmdfDUzKzdP+i7iVBsy7CZO0ECYl ds6ZVkTkDhj6OOx/cOiCWsxrgV2NyVoWxYPRsclO00W2nRWfmYoOg0iJH72Y79yCTeat 6jXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc; bh=lEzLHp5EUALGBDR080eL/ZTXye/B6ScLofp8WoGZutw=; b=VZ179Duc94PXpdbga89jLkuZ4PiTBV29bwg0p+sUhJI3UymeKiUuf2bDpA1qdKVp3b EYaz+bAM0l7iNFOc4o5POu5zchpVFWog5GEGawRNJxAy5Il0i5RkmU7a02VmTnBIHh62 ONpOnFvxYoOr/b1XN7prEgNS2W/eu/QItpRtMmDcl08zLb7PBK4YrHMlsCLM46QZIrGg z61kEOFiHjLXvCCX8xuMCNkPSQM5/vDDqTyeYyjOAoaii6/CzZThe3nNRlenvFUH+eO8 ByceiIO4zQeje07qcMGRL6nhvKzCs29x3u+OduPe012wE0Hy/HXyK6tirx3bSEwwya2c DKPA== X-Gm-Message-State: ACgBeo3k401sdZBPKEzjF1W+5smy9ms6+33oNPTuKVYaMN+6BsUk138m rqECtX+jvKmC89x7tn0A28nKtHVmKjg= X-Google-Smtp-Source: AA6agR5aFDFTV93gABXVtI6sO2HuTqIfM7XjbTB1z4Gt/hzYUN7LO58jr4g2RITDfY5OEI/Zy7OiK9gpPj0= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:a005:55b3:6c26:b3e4]) (user=surenb job=sendgmr) by 2002:a05:6902:89:b0:695:7ed0:d8cb with SMTP id h9-20020a056902008900b006957ed0d8cbmr13360099ybs.77.1661896198026; Tue, 30 Aug 2022 14:49:58 -0700 (PDT) Date: Tue, 30 Aug 2022 14:49:02 -0700 In-Reply-To: <20220830214919.53220-1-surenb@google.com> Mime-Version: 1.0 References: <20220830214919.53220-1-surenb@google.com> X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220830214919.53220-14-surenb@google.com> Subject: [RFC PATCH 13/30] mm/slab: introduce SLAB_NO_OBJ_EXT to avoid obj_ext creation From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, ldufour@linux.ibm.com, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, changbin.du@intel.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, arnd@arndb.de, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, surenb@google.com, kernel-team@android.com, linux-mm@kvack.org, iommu@lists.linux.dev, kasan-dev@googlegroups.com, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org Precedence: bulk List-ID: Slab extension objects can't be allocated before slab infrastructure is initialized. Some caches, like kmem_cache and kmem_cache_node, are created before slab infrastructure is initialized. Objects from these caches can't have extension objects. Introduce SLAB_NO_OBJ_EXT slab flag to mark these caches and avoid creating extensions for objects allocated from these slabs. Signed-off-by: Suren Baghdasaryan --- include/linux/slab.h | 7 +++++++ mm/slab.c | 2 +- mm/slub.c | 5 +++-- 3 files changed, 11 insertions(+), 3 deletions(-) diff --git a/include/linux/slab.h b/include/linux/slab.h index 0fefdf528e0d..55ae3ea864a4 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -124,6 +124,13 @@ #define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0x00020000U) #define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */ +#ifdef CONFIG_SLAB_OBJ_EXT +/* Slab created using create_boot_cache */ +#define SLAB_NO_OBJ_EXT ((slab_flags_t __force)0x20000000U) +#else +#define SLAB_NO_OBJ_EXT 0 +#endif + /* * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests. * diff --git a/mm/slab.c b/mm/slab.c index 10e96137b44f..ba97aeef7ec1 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1233,7 +1233,7 @@ void __init kmem_cache_init(void) create_boot_cache(kmem_cache, "kmem_cache", offsetof(struct kmem_cache, node) + nr_node_ids * sizeof(struct kmem_cache_node *), - SLAB_HWCACHE_ALIGN, 0, 0); + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); list_add(&kmem_cache->list, &slab_caches); slab_state = PARTIAL; diff --git a/mm/slub.c b/mm/slub.c index 862dbd9af4f5..80199d5ac7c9 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4825,7 +4825,8 @@ void __init kmem_cache_init(void) node_set(node, slab_nodes); create_boot_cache(kmem_cache_node, "kmem_cache_node", - sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN, 0, 0); + sizeof(struct kmem_cache_node), + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); register_hotmemory_notifier(&slab_memory_callback_nb); @@ -4835,7 +4836,7 @@ void __init kmem_cache_init(void) create_boot_cache(kmem_cache, "kmem_cache", offsetof(struct kmem_cache, node) + nr_node_ids * sizeof(struct kmem_cache_node *), - SLAB_HWCACHE_ALIGN, 0, 0); + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); kmem_cache = bootstrap(&boot_kmem_cache); kmem_cache_node = bootstrap(&boot_kmem_cache_node);