From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 8B6C92BEC36 for ; Tue, 22 Apr 2025 20:25:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745353550; cv=none; b=afWAbGBqiBMopbNmCbnt5O8wORh6IjRGBxfIcW7dEEe0+Eqctbf978biSg5iGXfZcvLag2Jyj9VKHtQ2Pu4J2kCo6J8cBaq8pG00Nhn5Hb6tKyAVZ1fNcWlUAnj5IdqoQSdhzRrjjzM6H2EnUBcj0lBwrJfeX2/jiA9XE5GxKl4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745353550; c=relaxed/simple; bh=M7oppvkdl8yV9cMfkLqvfVrLIgJLs9EPl5iJ/I1jFEQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=RhhhJS2IbC4uTcXW+7QOcmDRqMuyNOMiajAYEZcjR+k+vaT+EMYjIN7GD2OP1tVzKTA7hXOZwa20mXA3N0GJw8A1Is6ArUeCKFi9K21ouLGXfwFC62fznz5QA9AipvzTq1nYRfmESCSEHx6dUhIW/9zTN2UN35JmV2azPRS3DgE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=XjTtSHkD; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="XjTtSHkD" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=WSOQ4dvTzeJfWv+IHK711vYfV4BEChTnKQrUs0MLM7U=; b=XjTtSHkDIaJQ+L9K79iHL6xRJb A2Nn8a1HHxbuIvPAn4blztQ/HP89k+BIkLUuy0h54w9fJ469fxFUNT+OcngKN6aDeUrh06Ir/gTkF vH3CyDe9+fs1rX0fR8xSQg8bZDclSzepyefsAMxmfqUQF8+NiA8FQckWlWAOGmM/OxsnKOUbb5V0e 0b/sDnTeHa9GX3bbgsMu4Jw5e8Udt3NoznfyKmdiS07roE11v4NXsOH5t/xcairbppuCr72J+eXZk 46VB/7JK7OxEaBFJLnTIkoYKl4ybhdJujOC+3n1bRJBrINI/oHY31BPUZvOFXBxZYZKWhd5vGBazP l1bt5ptQ==; Received: from [172.31.31.140] (helo=u09cd745991455d.lumleys.internal) by desiato.infradead.org with esmtpsa (Exim 4.98.1 #2 (Red Hat Linux)) id 1u7KBL-0000000BK89-20MK; Tue, 22 Apr 2025 20:25:29 +0000 Message-ID: <1cf8ff5dd37054c8430c0a7578e84b7eec3f2a05.camel@infradead.org> Subject: Re: [PATCH v2] mm/mm_init: Don't iterate pages below ARCH_PFN_OFFSET From: David Woodhouse To: Andrew Morton , Ruihan Li Cc: Mike Rapoport , linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Tue, 22 Apr 2025 21:25:27 +0100 In-Reply-To: <20250422132047.22c6cd3a00893bdfd6766df4@linux-foundation.org> References: <20250419122801.1752234-1-lrh2000@pku.edu.cn> <20250422132047.22c6cd3a00893bdfd6766df4@linux-foundation.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Ur9cZciEJ7G6ugZkCBza" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-Ur9cZciEJ7G6ugZkCBza Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2025-04-22 at 13:20 -0700, Andrew Morton wrote: > On Tue, 22 Apr 2025 17:08:06 +0800 Ruihan Li wrote: >=20 > > Hi Mike, > >=20 > > Thanks for your review! > >=20 > > On Mon, Apr 21, 2025 at 07:41:43PM +0300, Mike Rapoport wrote: > > > On Sat, Apr 19, 2025 at 08:28:01PM +0800, Ruihan Li wrote: > > > > Currently, memmap_init initializes pfn_hole with 0 instead of > > > > ARCH_PFN_OFFSET. Then init_unavailable_range will start iterating e= ach > > > > page from the page at address zero to the first available page, but= it > > > > won't do anything for pages below ARCH_PFN_OFFSET because pfn_valid > > > > won't pass. > > > >=20 > > > > If ARCH_PFN_OFFSET is very large (e.g., something like 2^64-2GiB if= the > > > > kernel is used as a library and loaded at a very high address), the > > > > pointless iteration for pages below ARCH_PFN_OFFSET will take a ver= y > > > > long time, and the kernel will look stuck at boot time. > > > >=20 > > > > This commit sets the initial value of pfn_hole to ARCH_PFN_OFFSET, = which > > > > avoids the problematic and useless iteration mentioned above. > > > >=20 > > > > This problem has existed since commit 907ec5fca3dc ("mm: zero remai= ning > > > > unavailable struct pages"). > > > >=20 > > > > Signed-off-by: Ruihan Li > > > > --- > > > > Link to v1: > > > > =C2=A0 - https://lore.kernel.org/linux-mm/20250418162727.1535335-1-= lrh2000@pku.edu.cn/ > > > > Changes since v1: > > > > =C2=A0 - Removed the unnecessary Fixes tag. > > > > =C2=A0 - Fixed the build issue for CONFIG_SPARSEMEM. > > > >=20 > > > > =C2=A0 mm/mm_init.c | 9 +++++++++ > > > > =C2=A0 1 file changed, 9 insertions(+) > > > >=20 > > > > diff --git a/mm/mm_init.c b/mm/mm_init.c > > > > index 84f14fa12..a697a83ff 100644 > > > > --- a/mm/mm_init.c > > > > +++ b/mm/mm_init.c > > > > @@ -969,6 +969,15 @@ static void __init memmap_init(void) > > > > =C2=A0=C2=A0 unsigned long hole_pfn =3D 0; > > > > =C2=A0=C2=A0 int i, j, zone_id =3D 0, nid; > > > > =C2=A0=20 > > > > +#ifdef CONFIG_FLATMEM > > > > + /* > > > > + * Pages below ARCH_PFN_OFFSET are invalid as far as pfn_valid is > > > > + * concerned, so don't waste time iterating on them when looking > > > > + * for holes. > > > > + */ > > > > + hole_pfn =3D ARCH_PFN_OFFSET; > > > > +#endif > > > > + > > >=20 > > > I'd prefer a solution for both FLATMEM and SPARSMEM.=20 > > >=20 > > > David Woodhouse proposed a for_each_valid_pfn() a while ago: > > >=20 > > > https://lore.kernel.org/all/20250404155959.3442111-1-dwmw2@infradead.= org > > >=20 > > > It can be used in init_unavailable_range() and will essentially skip = the > > > unpopulated memory map. > >=20 > > for_each_valid_pfn sounds much better. Thanks for your input. > >=20 > > However, the problem is that David's patch is not showing up in the > > mainline, so what can I do to move forward with my patch? > >=20 > > Perhaps you mean that I should wait until David's patch is merged and > > send another patch to fix the problem? >=20 > (cc David) Want to add a patch on top of my tree at https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/for_eac= h_valid_pfn and I'll send it on with the rest? --=-Ur9cZciEJ7G6ugZkCBza Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx 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