From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 83200C36010 for ; Tue, 1 Apr 2025 11:57:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:Content-Type: References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ePyej/S/qrnOLGG9wR7D8lEckZUVZHmbvvNqD3ktJlk=; b=HzQaAN2UvEOyrhrZg7zLjZO5kn 0toBRSsQ7X2OBVwNkvr+gyLAjVTFKwf53qbaT1DZV5hguN1Oco2v/ekpqAJz1Fa4Nj0XiDnxNvez2 stTBuxm153VsLp6mvFpg0OFCX02mCV8ez3a3BSwzZPrl9wsfu4XTfVNcAATjoJNtG1Dy181FNfOqZ m0Xn5khYNxYI5MMCZ67TSMlBx/pbI1o0eSZsVMbQDJwXaWK12Tb02FXCjh5Ah9imc4gL2f3HWOzXo jyoAWUzfwU4xxzIy9Ceyw9w9mBUixeUQ6I8kjwRite2RL467p3HhN5E1fLmVpc7TSTqq+qV+Ty15M FSVBmzCA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.1 #2 (Red Hat Linux)) id 1tzaFX-00000002rS2-4Ap9; Tue, 01 Apr 2025 11:57:48 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98.1 #2 (Red Hat Linux)) id 1tza8b-00000002qRJ-1KpJ for linux-arm-kernel@bombadil.infradead.org; Tue, 01 Apr 2025 11:50:37 +0000 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=ePyej/S/qrnOLGG9wR7D8lEckZUVZHmbvvNqD3ktJlk=; b=fs/1Y7q+FXJyt5iuRwPh/skSFB 1N0Ww6DjmWuf8N3lx64js7zNSbq+hIYC7HPK3a7QpeagDf3ikIBzBX8AlquUZ5irLRT4Wh/GIDAw8 d48XLg0C/jxjyHYiDSDIl+KbYzPz2TDzLDcYo+s+xj5pN53tFF3VnrvCsxsENMxUMIEdsPJKn/zFd WrQyEi7DN0yARLSCznxbr1ZCgGyGPKzbD7j7nTezKlP0q+swIsSO6hY3ISs3Q6G1EUrihjvsK+F/f slvtadLc8/hXtdfxH8N5V8A6ZfIHG3OljS15RsmA8cx/1cPzJsq/eg4vtXYUDQC+GWtgT2l3PwxZs p/Hi2Z5A==; Received: from [172.31.31.145] (helo=u09cd745991455d.lumleys.internal) by desiato.infradead.org with esmtpsa (Exim 4.98.1 #2 (Red Hat Linux)) id 1tza8X-00000006oJQ-39Vw; Tue, 01 Apr 2025 11:50:34 +0000 Message-ID: <1787b97c267b53127c60a61419d99751f8a66b1a.camel@infradead.org> Subject: Re: [PATCH v4 2/4] memblock: update initialization of reserved pages From: David Woodhouse To: Mike Rapoport Cc: Andrew Morton , "Sauerwein, David" , Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , David Hildenbrand , Marc Zyngier , Mark Rutland , Mike Rapoport , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Date: Tue, 01 Apr 2025 12:50:33 +0100 In-Reply-To: References: <20210511100550.28178-1-rppt@kernel.org> <20210511100550.28178-3-rppt@kernel.org> <9f33c0b4517eaf5f36c515b92bdcb6170a4a576a.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-nnwfBxLTG/70tL6apTXw" User-Agent: Evolution 3.52.3-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --=-nnwfBxLTG/70tL6apTXw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2025-04-01 at 14:33 +0300, Mike Rapoport wrote: > On Mon, Mar 31, 2025 at 04:13:56PM +0100, David Woodhouse wrote: > > On Mon, 2025-03-31 at 17:50 +0300, Mike Rapoport wrote: > > > On Mon, Mar 31, 2025 at 01:50:33PM +0100, David Woodhouse wrote: > > > > On Tue, 2021-05-11 at 13:05 +0300, Mike Rapoport wrote: > > > >=20 > > > > On platforms with large NOMAP regions (e.g. which are actually rese= rved > > > > for guest memory to keep it out of the Linux address map and allow = for > > > > kexec-based live update of the hypervisor), this pointless loop end= s up > > > > taking a significant amount of time which is visible as guest steal > > > > time during the live update. > > > >=20 > > > > Can reserve_bootmem_region() skip the loop *completely* if no PFN i= n > > > > the range from start to end is valid? Or tweak the loop itself to h= ave > > > > an 'else' case which skips to the next valid PFN? Something like > > > >=20 > > > > =C2=A0for(...) { > > > > =C2=A0=C2=A0=C2=A0 if (pfn_valid(start_pfn)) { > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ... > > > > =C2=A0=C2=A0=C2=A0 } else { > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 start_pfn =3D next_valid_pfn(s= tart_pfn); > > > > =C2=A0=C2=A0=C2=A0 } > > > > =C2=A0} > > >=20 > > > My understanding is that you have large reserved NOMAP ranges that do= n't > > > appear as memory at all, so no memory map for them is created and so > > > pfn_valid() is false for pfns in those ranges. > > >=20 > > > If this is the case one way indeed would be to make > > > reserve_bootmem_region() skip ranges with no valid pfns. > > >=20 > > > Another way could be to memblock_reserved_mark_noinit() such ranges a= nd > > > then reserve_bootmem_region() won't even get called, but that would r= equire > > > firmware to pass that information somehow. > >=20 > > I was thinking along these lines (not even build tested)... > >=20 > > I don't much like the (unsigned long)-1 part. I might make the helper > > 'static inline bool first_valid_pfn (unsigned long *pfn)' and return > > success or failure. But that's an implementation detail. > >=20 > > index 6d1fb6162ac1..edd27ba3e908 100644 > > --- a/include/asm-generic/memory_model.h > > +++ b/include/asm-generic/memory_model.h > > @@ -29,8 +29,43 @@ static inline int pfn_valid(unsigned long pfn) > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return pfn >=3D pfn_offset &= & (pfn - pfn_offset) < max_mapnr; > > =C2=A0} > > =C2=A0#define pfn_valid pfn_valid > > + > > +static inline unsigned long first_valid_pfn(unsigned long pfn) > > +{ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* avoid include hel= l */ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 extern unsigned long max_mapnr; > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unsigned long pfn_offset =3D ARCH= _PFN_OFFSET; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (pfn < pfn_offset) > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 return pfn_offset; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if ((pfn - pfn_offset) < max_mapn= r) > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 return pfn; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return (unsigned long)(-1); > > +} >=20 > This seems about right for FLATMEM. For SPARSEMEM it would be something > along these lines (I kept dubious -1): Thanks. Is that right even with CONFIG_SPARSEMEM_VMEMMAP? It seems that it's possible for pfn_valid() to be false for a given *page*, but there may still be valid pages in the remainder of the same section in that case?=20 I think it should only skip to the next section if the current section doesn't exist at all, not just when pfn_section_valid() return false? I also wasn't sure how to cope with the rcu_read_lock_sched() that happens in pfn_valid(). What's that protecting against? Does it mean that by the time pfn_valid() returns true, that might not be the correct answer any more? > static inline unsigned long first_valid_pfn(unsigned long pfn) > { > unsigned long nr =3D pfn_to_section_nr(pfn); >=20 > do { > if (pfn_valid(pfn)) > return pfn; > pfn =3D section_nr_to_pfn(nr++); > } while (nr < NR_MEM_SECTIONS); >=20 > return (unsigned long)-1; > } >=20 --=-nnwfBxLTG/70tL6apTXw Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv 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