From patchwork Tue Apr 9 19:23:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13623172 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 C555A1586F8 for ; Tue, 9 Apr 2024 19:26:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712690820; cv=none; b=CjLPHc1TdVpbPjUUxFudGTRynJ3GirHQHqsHD+WhVNqv2RMKKfGKYig+oWAWl+EQQu08QeZfB/Wkr0dbofJiFElz7jrfbUNdbbrlbw7AjSXYoz8hdwK5u/VXc0qJ2aGlY8RseCBvg643L7hQukoYQ7eoZsbPlvt7USBss5XfnkY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712690820; c=relaxed/simple; bh=sYeMlPL5beHAUJA6nbySpZ8t2Qp6YBalKzijeijJLW4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sOOQVHtSeLoqN9yJGqrOrN/1vR3wp2/le3luoLYqs20h7CJvDRt9g72lW1ptQfw94waUM3zpYGNhTtlAnZstXuqBFAhvrE4fylyqyewS2vriJxdOHJa/LM8+wK6CI/2uym/A1TdbHE7QVbSQLbP100zkswbpEcZiU/afQCPvEWU= 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=W6KVD8lt; arc=none smtp.client-ip=170.10.129.124 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="W6KVD8lt" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1712690817; 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=9BvBZKQ0eVCGMopeE4n6MDTyBxCnbPUcn/eYDU7e+Xc=; b=W6KVD8ltNPQZnCc0hqsQNI5IfVf7VaX4jrTqB0CIB1zKSgOf9oCL7w4vnKIIv7s1mjxIAv N05jKeisJIEVoYPQsfMPJ+ppjxF6eyjXErVLriVeUWNQSkCGOBuSc9fmSXHU0Mx++JhWCU EMHbG3W72i4WeHIEMqGZNa8bXqvmVPI= 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-183-3faOSIxmOvCIGn74HLebCA-1; Tue, 09 Apr 2024 15:26:53 -0400 X-MC-Unique: 3faOSIxmOvCIGn74HLebCA-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 76CA5188ACAA; Tue, 9 Apr 2024 19:26:52 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.39.192.106]) by smtp.corp.redhat.com (Postfix) with ESMTP id C430140B497A; Tue, 9 Apr 2024 19:26:40 +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 17/18] mm/debug: print only page mapcount (excluding folio entire mapcount) in __dump_folio() Date: Tue, 9 Apr 2024 21:23:00 +0200 Message-ID: <20240409192301.907377-18-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-trace-kernel@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 simplify and only print the page mapcount: we already print the large folio mapcount and the entire folio mapcount for large folios separately; that should be sufficient to figure out what's happening. While at it, print the page mapcount also if it had an underflow, filtering out only typed pages. Signed-off-by: David Hildenbrand --- mm/debug.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/mm/debug.c b/mm/debug.c index d064db42af54..69e524c3e601 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -55,15 +55,10 @@ static void __dump_folio(struct folio *folio, struct page *page, unsigned long pfn, unsigned long idx) { struct address_space *mapping = folio_mapping(folio); - int mapcount = atomic_read(&page->_mapcount) + 1; + int mapcount = atomic_read(&page->_mapcount); char *type = ""; - /* Open-code page_mapcount() to avoid looking up a stale folio */ - if (mapcount < 0) - mapcount = 0; - if (folio_test_large(folio)) - mapcount += folio_entire_mapcount(folio); - + mapcount = page_type_has_type(mapcount) ? 0 : mapcount + 1; pr_warn("page: refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n", folio_ref_count(folio), mapcount, mapping, folio->index + idx, pfn);