From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 725D2C48BE8 for ; Tue, 15 Jun 2021 13:14:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5640F61465 for ; Tue, 15 Jun 2021 13:14:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230187AbhFONQW (ORCPT ); Tue, 15 Jun 2021 09:16:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230012AbhFONQW (ORCPT ); Tue, 15 Jun 2021 09:16:22 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30B03C061574; Tue, 15 Jun 2021 06:14:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=gAw+EDJapOH99CiLXwhTpHsII+/WeUYXvhWh+ymJSpQ=; b=fE2431uQ0PQ9viz/cOBwY0PrjN ks6P7qyrkv1LNvZpcWXOpRZKca3Mxx0paPyzwKMwRfnZ7uI/8cIZVRsdjScgjVNN7pS8op/ufmUVq joclDJNzlITVS0SbpludUS30uhNp1JHV32pVWdltUGn/kG9z9Bg/Vdlnlsh/yKuoppUprZSU03YR6 YZEj+zfgt1YoF4ulGpf9NMs/VrsuhxjppI9kKZI35fGvWKfURueH8O38zCMTkETBL97eyBrFG2IZV hbsBMaQgst63NGQputk/S5qrjINQxdePumTqwF6KEQRbpBDIE59jXEgAO7P7CwtUnol4NkZ0FhOZ5 rtI5GfRw==; Received: from [2001:4bb8:19b:fdce:9045:1e63:20f0:ca9] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1lt8sy-006nNp-Cz; Tue, 15 Jun 2021 13:13:47 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Jeffle Xu , Ming Lei , Damien Le Moal , Keith Busch , Sagi Grimberg , "Wunderlich, Mark" , "Vasudevan, Anil" , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nvme@lists.infradead.org Subject: [PATCH 11/16] block: use SLAB_TYPESAFE_BY_RCU for the bio slab Date: Tue, 15 Jun 2021 15:10:29 +0200 Message-Id: <20210615131034.752623-12-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210615131034.752623-1-hch@lst.de> References: <20210615131034.752623-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org This flags ensures that the pages will not be reused for non-bio allocations before the end of an RCU grace period. With that we can safely use a RCU lookup for bio polling as long as we are fine with occasionally polling the wrong device. Signed-off-by: Christoph Hellwig Tested-by: Mark Wunderlich --- block/bio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index 44205dfb6b60..de5505d7018e 100644 --- a/block/bio.c +++ b/block/bio.c @@ -82,7 +82,8 @@ static struct bio_slab *create_bio_slab(unsigned int size) snprintf(bslab->name, sizeof(bslab->name), "bio-%d", size); bslab->slab = kmem_cache_create(bslab->name, size, - ARCH_KMALLOC_MINALIGN, SLAB_HWCACHE_ALIGN, NULL); + ARCH_KMALLOC_MINALIGN, + SLAB_HWCACHE_ALIGN | SLAB_TYPESAFE_BY_RCU, NULL); if (!bslab->slab) goto fail_alloc_slab; -- 2.30.2