From patchwork Wed Sep 8 02:53:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12479795 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD0E0C433F5 for ; Wed, 8 Sep 2021 02:53:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8BDEF61102 for ; Wed, 8 Sep 2021 02:53:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 8BDEF61102 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 2DFD9940009; Tue, 7 Sep 2021 22:53:08 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 29080940008; Tue, 7 Sep 2021 22:53:08 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 17EB0940009; Tue, 7 Sep 2021 22:53:08 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0171.hostedemail.com [216.40.44.171]) by kanga.kvack.org (Postfix) with ESMTP id 0ADED940008 for ; Tue, 7 Sep 2021 22:53:08 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id B6DC9181F9336 for ; Wed, 8 Sep 2021 02:53:07 +0000 (UTC) X-FDA: 78562884414.13.0F48223 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf13.hostedemail.com (Postfix) with ESMTP id 5F128102B4BB for ; Wed, 8 Sep 2021 02:53:07 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 17B6D610C9; Wed, 8 Sep 2021 02:53:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1631069586; bh=Ga4Couddr396dCEe/4wWVWoAX+tGISvaf0iNFUsO1Bg=; h=Date:From:To:Subject:In-Reply-To:From; b=fs+ebpVAyH/hbjRcbvM3nDG5KWW3ZhKiTxM/w0eWs9NEMJ5NzKQNAoiST4wqb4C0e 59UD6ykQElypWhXzrgyZrMHkgLgki+zE6mqAq34M/BXvpcvdZytKkEle+KFBNTvv6g Cc9ILeVc1bR5g626tHMbK9202VY9fivFwndFWOO0= Date: Tue, 07 Sep 2021 19:53:05 -0700 From: Andrew Morton To: akpm@linux-foundation.org, bigeasy@linutronix.de, brouer@redhat.com, cl@linux.com, efault@gmx.de, iamjoonsoo.kim@lge.com, jannh@google.com, linux-mm@kvack.org, mgorman@techsingularity.net, mm-commits@vger.kernel.org, penberg@kernel.org, quic_qiancai@quicinc.com, rientjes@google.com, tglx@linutronix.de, torvalds@linux-foundation.org, vbabka@suse.cz Subject: [patch 003/147] mm, slub: allocate private object map for validate_slab_cache() Message-ID: <20210908025305.gswNP7HrX%akpm@linux-foundation.org> In-Reply-To: <20210907195226.14b1d22a07c085b22968b933@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 5F128102B4BB Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=fs+ebpVA; dmarc=none; spf=pass (imf13.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Rspamd-Server: rspam01 X-Stat-Signature: 6jmi8r8dqbqke38npwdjy5931e4xe6gc X-HE-Tag: 1631069587-129319 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Vlastimil Babka Subject: mm, slub: allocate private object map for validate_slab_cache() validate_slab_cache() is called either to handle a sysfs write, or from a self-test context. In both situations it's straightforward to preallocate a private object bitmap instead of grabbing the shared static one meant for critical sections, so let's do that. Link: https://lkml.kernel.org/r/20210904105003.11688-4-vbabka@suse.cz Signed-off-by: Vlastimil Babka Acked-by: Christoph Lameter Acked-by: Mel Gorman Cc: David Rientjes Cc: Jann Horn Cc: Jesper Dangaard Brouer Cc: Joonsoo Kim Cc: Mike Galbraith Cc: Pekka Enberg Cc: Qian Cai Cc: Sebastian Andrzej Siewior Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- mm/slub.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) --- a/mm/slub.c~mm-slub-allocate-private-object-map-for-validate_slab_cache +++ a/mm/slub.c @@ -4679,11 +4679,11 @@ static int count_total(struct page *page #endif #ifdef CONFIG_SLUB_DEBUG -static void validate_slab(struct kmem_cache *s, struct page *page) +static void validate_slab(struct kmem_cache *s, struct page *page, + unsigned long *obj_map) { void *p; void *addr = page_address(page); - unsigned long *map; slab_lock(page); @@ -4691,21 +4691,20 @@ static void validate_slab(struct kmem_ca goto unlock; /* Now we know that a valid freelist exists */ - map = get_map(s, page); + __fill_map(obj_map, s, page); for_each_object(p, s, addr, page->objects) { - u8 val = test_bit(__obj_to_index(s, addr, p), map) ? + u8 val = test_bit(__obj_to_index(s, addr, p), obj_map) ? SLUB_RED_INACTIVE : SLUB_RED_ACTIVE; if (!check_object(s, page, p, val)) break; } - put_map(map); unlock: slab_unlock(page); } static int validate_slab_node(struct kmem_cache *s, - struct kmem_cache_node *n) + struct kmem_cache_node *n, unsigned long *obj_map) { unsigned long count = 0; struct page *page; @@ -4714,7 +4713,7 @@ static int validate_slab_node(struct kme spin_lock_irqsave(&n->list_lock, flags); list_for_each_entry(page, &n->partial, slab_list) { - validate_slab(s, page); + validate_slab(s, page, obj_map); count++; } if (count != n->nr_partial) { @@ -4727,7 +4726,7 @@ static int validate_slab_node(struct kme goto out; list_for_each_entry(page, &n->full, slab_list) { - validate_slab(s, page); + validate_slab(s, page, obj_map); count++; } if (count != atomic_long_read(&n->nr_slabs)) { @@ -4746,10 +4745,17 @@ long validate_slab_cache(struct kmem_cac int node; unsigned long count = 0; struct kmem_cache_node *n; + unsigned long *obj_map; + + obj_map = bitmap_alloc(oo_objects(s->oo), GFP_KERNEL); + if (!obj_map) + return -ENOMEM; flush_all(s); for_each_kmem_cache_node(s, node, n) - count += validate_slab_node(s, n); + count += validate_slab_node(s, n, obj_map); + + bitmap_free(obj_map); return count; }