From nobody Sun Feb 8 21:27:08 2026 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 8685917109F for ; Mon, 25 Mar 2024 14:57:35 +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=1711378657; cv=none; b=lYSZo2ng1XCs67cAHldQjiwo5wzCpSXYfBp/K5HelwqsMucjhzMU2i05Poa7MzcT7wGyUHd2NMFG3vvAa4Xk1EBBvPZ2SvHFOVIpgvfqUbFgOHTgkrnBT8K7WgV0ud0Pg8iNt+pXtdEQX8XIWXV2Z0uiVOFUzHZNonZ7E1vicxs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711378657; c=relaxed/simple; bh=/3x9uU4JEdnWRIIFRxv/hyPYL+QmN9SSLlG04ZxhdSE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=megqExISB07lKsCQ6JSEKVTa33MbweX7M+cfOnxeOacP2Mw1rz9mDCW/NdOD2w4ZxKPrAoEcsB2cUGo6R1IKlNo1MsxGp7MamCBKtqZpMYGoHHnD+JlNox1u3DFXFhuy91a94h6I+1CYQ57XGZAMjSTX+tbTQ5QfRnKL2AJdmw4= 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=hw+Qp2dM; 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="hw+Qp2dM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1711378654; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1Ez2QF5MYw9LVg300C2Oo4I1YSujmhzgBkyBgmFJgxw=; b=hw+Qp2dMi7HmOojomJZsRKBA9DhnmnPQA+9V2E1lx7xabFlm1bzATin5QAR4IIoTT/kNYJ fpx4NCW2hP6Wsw5+fDwdbvZDOUOUNtxS4B8JPW8la+H8f+yqQJW68ytu7cpbxAQOYYmhBh iRYzzkRfpI2WJ/BVF1yjZt2rGRsR1zY= 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-556-UPy8WchcPpKKNZJqlR81mg-1; Mon, 25 Mar 2024 10:57:29 -0400 X-MC-Unique: UPy8WchcPpKKNZJqlR81mg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (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 0BBCA800267; Mon, 25 Mar 2024 14:57:29 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.116.12]) by smtp.corp.redhat.com (Postfix) with ESMTP id D78C43C22; Mon, 25 Mar 2024 14:57:25 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org, rppt@kernel.org, Baoquan He Subject: [PATCH v2 3/6] mm/mm_init.c: add new function calc_nr_all_pages() Date: Mon, 25 Mar 2024 22:56:43 +0800 Message-ID: <20240325145646.1044760-4-bhe@redhat.com> In-Reply-To: <20240325145646.1044760-1-bhe@redhat.com> References: <20240325145646.1044760-1-bhe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 Content-Type: text/plain; charset="utf-8" This is a preparation to calculate nr_kernel_pages and nr_all_pages, both of which will be used later in alloc_large_system_hash(). nr_all_pages counts up all free but not reserved memory in memblock allocator, including HIGHMEM memory. While nr_kernel_pages counts up all free but not reserved low memory in memblock allocator, excluding HIGHMEM memory. Signed-off-by: Baoquan He Reviewed-by: Mike Rapoport (IBM) --- mm/mm_init.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/mm/mm_init.c b/mm/mm_init.c index 153fb2dc666f..c57a7fc97a16 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1264,6 +1264,30 @@ static void __init reset_memoryless_node_totalpages(= struct pglist_data *pgdat) pr_debug("On node %d totalpages: 0\n", pgdat->node_id); } =20 +static void __init calc_nr_kernel_pages(void) +{ + unsigned long start_pfn, end_pfn; + phys_addr_t start_addr, end_addr; + u64 u; +#ifdef CONFIG_HIGHMEM + unsigned long high_zone_low =3D arch_zone_lowest_possible_pfn[ZONE_HIGHME= M]; +#endif + + for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start_addr, &end= _addr, NULL) { + start_pfn =3D PFN_UP(start_addr); + end_pfn =3D PFN_DOWN(end_addr); + + if (start_pfn < end_pfn) { + nr_all_pages +=3D end_pfn - start_pfn; +#ifdef CONFIG_HIGHMEM + start_pfn =3D clamp(start_pfn, 0, high_zone_low); + end_pfn =3D clamp(end_pfn, 0, high_zone_low); +#endif + nr_kernel_pages +=3D end_pfn - start_pfn; + } + } +} + static void __init calculate_node_totalpages(struct pglist_data *pgdat, unsigned long node_start_pfn, unsigned long node_end_pfn) --=20 2.41.0