From patchwork Tue Apr 9 19:22:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13623139 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 51158157A7F for ; Tue, 9 Apr 2024 19:24:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712690654; cv=none; b=Beto+vSQuaGmZ/CP9ttZi5BXIg9AL2xOCuR5UeRKrEKCPHa1hfw59lLJ1yiniaJc/Ylz0qrWSZTM6ZZ5DmRiu2YBHBVSOenhXepkHGwp/q4Go92DhuT0a2n0zVu/hvG2CCFV5Cci+Rsh5YJuaKAsXeklx7GbLru5uxnOJoeGJfs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712690654; c=relaxed/simple; bh=A67TbDz2qCguWtpXjavdA9CUCuXT3t/vnWxh8asQyzo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YClXwgmiTjjXgWlBKq6LB2qNsHHMvhCpmZOWomI9A77Nzu7fqFiWM+h9bQ5BRopumLKhG9OqEy0zsVOlbMTC7ClZHc/6g9hiUCWP7EfWWahGS8G3CGpU0RBgHRcxClAhpqAdSLp8O7rdo2o6Zjgl2LXwI3XvMTS++iju18mmxjQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=IsM27sPf; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="IsM27sPf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1712690652; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DanfdMkK2y8X/5UQWi5wxydKuxMzBBZcoNekt2NzNQo=; b=IsM27sPf8gQiP6NDMLiNYeGmmIxoB5Qd5LSPV5itCR3qxnNesKaWH+2ljs24zWQU2Oo/ue jGEa+0t8/LAWlNT4enPgkqnNu8Q0QOygKOZ1hrPP4xlMUlXdArcVeCtgu6cnhq3sN2/anH aulCHMU5TS0xjKGk+yYExFqUkc//UAM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-140-eJSj8LVjMUGt1dEE8jgGSA-1; Tue, 09 Apr 2024 15:24:08 -0400 X-MC-Unique: eJSj8LVjMUGt1dEE8jgGSA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E743E806604; Tue, 9 Apr 2024 19:24:06 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.39.192.106]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3CAAC40B4982; Tue, 9 Apr 2024 19:24:00 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, cgroups@vger.kernel.org, linux-sh@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, David Hildenbrand , Andrew Morton , "Matthew Wilcox (Oracle)" , Peter Xu , Ryan Roberts , Yin Fengwei , Yang Shi , Zi Yan , Jonathan Corbet , Hugh Dickins , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Chris Zankel , Max Filippov , Muchun Song , Miaohe Lin , Naoya Horiguchi , Richard Chang Subject: [PATCH v1 03/18] mm/rmap: add fast-path for small folios when adding/removing/duplicating Date: Tue, 9 Apr 2024 21:22:46 +0200 Message-ID: <20240409192301.907377-4-david@redhat.com> In-Reply-To: <20240409192301.907377-1-david@redhat.com> References: <20240409192301.907377-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 Let's add a fast-path for small folios to all relevant rmap functions. Note that only RMAP_LEVEL_PTE applies. This is a preparation for tracking the mapcount of large folios in a single value. Signed-off-by: David Hildenbrand Reviewed-by: Yin Fengwei --- include/linux/rmap.h | 13 +++++++++++++ mm/rmap.c | 26 ++++++++++++++++---------- 2 files changed, 29 insertions(+), 10 deletions(-) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 9549d78928bb..327f1ca5a487 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -322,6 +322,11 @@ static __always_inline void __folio_dup_file_rmap(struct folio *folio, switch (level) { case RMAP_LEVEL_PTE: + if (!folio_test_large(folio)) { + atomic_inc(&page->_mapcount); + break; + } + do { atomic_inc(&page->_mapcount); } while (page++, --nr_pages > 0); @@ -405,6 +410,14 @@ static __always_inline int __folio_try_dup_anon_rmap(struct folio *folio, if (PageAnonExclusive(page + i)) return -EBUSY; } + + if (!folio_test_large(folio)) { + if (PageAnonExclusive(page)) + ClearPageAnonExclusive(page); + atomic_inc(&page->_mapcount); + break; + } + do { if (PageAnonExclusive(page)) ClearPageAnonExclusive(page); diff --git a/mm/rmap.c b/mm/rmap.c index 56b313aa2ebf..4bde6d60db6c 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1172,15 +1172,18 @@ static __always_inline unsigned int __folio_add_rmap(struct folio *folio, switch (level) { case RMAP_LEVEL_PTE: + if (!folio_test_large(folio)) { + nr = atomic_inc_and_test(&page->_mapcount); + break; + } + do { first = atomic_inc_and_test(&page->_mapcount); - if (first && folio_test_large(folio)) { + if (first) { first = atomic_inc_return_relaxed(mapped); - first = (first < ENTIRELY_MAPPED); + if (first < ENTIRELY_MAPPED) + nr++; } - - if (first) - nr++; } while (page++, --nr_pages > 0); break; case RMAP_LEVEL_PMD: @@ -1514,15 +1517,18 @@ static __always_inline void __folio_remove_rmap(struct folio *folio, switch (level) { case RMAP_LEVEL_PTE: + if (!folio_test_large(folio)) { + nr = atomic_add_negative(-1, &page->_mapcount); + break; + } + do { last = atomic_add_negative(-1, &page->_mapcount); - if (last && folio_test_large(folio)) { + if (last) { last = atomic_dec_return_relaxed(mapped); - last = (last < ENTIRELY_MAPPED); + if (last < ENTIRELY_MAPPED) + nr++; } - - if (last) - nr++; } while (page++, --nr_pages > 0); break; case RMAP_LEVEL_PMD: