From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-1817771-1527159680-2-12041241156567881619 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, MAILING_LIST_MULTI -1, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='cz', MailFrom='org' X-Spam-charsets: X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-api-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1527159680; b=Aq4O8zxXtzOLjU5i/9d8RgdaYcd079hMX5ez/ZmHCPfRV2oy8o /pG3uxP6aTvNmG+gvZGEaQs+oZdz+pOk5iO36KzTRPBO41/uqWmM8KRvaSu2w8bh z1JQmW5f8Ez9yyeILUSpc/PNuMrinYa/NZdNXwEeVZx/yyAZruOZzf56FV9It0tj 8p88zhlJTv7LvuYAkB0+Rbd/yCgK67jnF8jrjqXSwY1qk7F4eA/zohs51ZnYoPX7 ua1LETfID5X1wiUHqLlyToFlFbRCaXGzDvdKTyOP2ln2BxrvkMdFQHHa3bvAO8pe oVywzSZJB+D7o0GAx5PxPgpjmSZXti5bGenQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:sender:list-id; s=fm2; t=1527159680; bh= ZfCZ0fiBDjVUc9HFH8OspGsrRQOIOXT7x+ol+Jfa8X8=; b=nEZwxky5l3ROACf8 ApNi76LRgIRXuoiJ9o7HVPnc36ZfMM0CB+cucvyT6+87Eub5QcgFdF+7OSes0oNk 8mRORbNyi7MQr0Zdm9coSUjxNvpnEigBSlDhjB8NAPEnM8sia1NOrSrPLP2VzvwL d8CCgF95slP4h1mZ3+WZTc+6r5GCH2HX0p/x9OYISaw7rUyoopFJYdBQJvN/YTr8 ckqBQEopUmVk1Vfegrh9O1Lg0jYkyLOn0ZD/08EmjnwbdCHwZNfggUWBMSZwvLsd J0Epoz/dAxudDCuHXOGMCFBR2kpSkUf8Bpevo/w0fWAe9daZTK11CkLWpeFb5P3c NmaPlA== ARC-Authentication-Results: i=1; mx6.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=suse.cz; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=suse.cz header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx6.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=suse.cz; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=suse.cz header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfKc9RhEe+ju0iJZlh/xw6amEIE3ZaBGsd8hwjdrUhnC5Iq+BrsNgR8WNQqBoZCHT2RC7qM4jgckqi1y1NcYwBRVhmIaSncnDFqArXnvhowrZ+30fhYKE qtlpXAVsPzn5xbNXiJcl6TwHdEUTM+D1R3tPgMWnff6Y8fcbMDSbTumMcICGG4P5V2cJfq3A5YxFLtFMXHZWiDI51jpg2joFdOsp0qCWNiZxlDxvmt0zexX/ X-CM-Analysis: v=2.3 cv=FKU1Odgs c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=VUJBJC2UJ8kA:10 a=VwQbUJbxAAAA:8 a=71kHirqOESHJkAQGzHkA:9 a=x8gzFH9gYPwA:10 a=AjGcO6oz07-iQ99wixmX:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030261AbeEXLA0 (ORCPT ); Thu, 24 May 2018 07:00:26 -0400 Received: from mx2.suse.de ([195.135.220.15]:36143 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030243AbeEXLAY (ORCPT ); Thu, 24 May 2018 07:00:24 -0400 From: Vlastimil Babka To: linux-mm@kvack.org Cc: Roman Gushchin , Michal Hocko , Johannes Weiner , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Mel Gorman , Vijayanand Jitta , Vlastimil Babka Subject: [RFC PATCH 2/5] mm, slab: allocate off-slab freelists as reclaimable when appropriate Date: Thu, 24 May 2018 13:00:08 +0200 Message-Id: <20180524110011.1940-3-vbabka@suse.cz> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180524110011.1940-1-vbabka@suse.cz> References: <20180524110011.1940-1-vbabka@suse.cz> Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: In SLAB, OFF_SLAB caches allocate management structures (currently just the freelist) from kmalloc caches when placement in a slab page together with objects would lead to suboptimal memory usage. For SLAB_RECLAIM_ACCOUNT caches, we can allocate the freelists from the newly introduced reclaimable kmalloc caches, because shrinking the OFF_SLAB cache will in general result to freeing of the freelists as well. This should improve accounting and anti-fragmentation a bit. Signed-off-by: Vlastimil Babka --- mm/slab.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/slab.c b/mm/slab.c index 8d7e1f06127b..4dd7d73a1972 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2142,8 +2142,13 @@ int __kmem_cache_create(struct kmem_cache *cachep, slab_flags_t flags) #endif if (OFF_SLAB(cachep)) { + /* + * If this cache is reclaimable, allocate also freelists from + * a reclaimable kmalloc cache. + */ cachep->freelist_cache = - kmalloc_slab(cachep->freelist_size, 0u); + kmalloc_slab(cachep->freelist_size, + cachep->allocflags & __GFP_RECLAIMABLE); } err = setup_cpu_cache(cachep, gfp); -- 2.17.0