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 819D1C3600B for ; Mon, 31 Mar 2025 12:52:36 +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=jJMjgcfJtQ3t79N9dIrfR4F9a0xZxCoodgcC2OCf4q0=; b=nFCGG0p47EqPO9MRyslrzcAmSA AtAvjm5mE8Aiqk1QdFEW4t7p1vC0gOQjvnkXvDCWXAW/x1vYRWemr0vvAujrRfy6/12A2oHMAISzN HM/23HX8LeUcF+MKqLLmj/N+dqTCJnN5kuQEgNp4AMt93LUZAIQq+eEyz4ZTJsshYQV55/eq7uM+c WfOycKerQmK8oDmdIGHePY9BJC3CIDy/37ZljOsHYaUhxQ1rF8bDVv9LOzlIuz3Eap/2jRZ2nMqJG AlkVuZWwjJJn30CXOy4XWpDIpTbC/Rwlnx6lSBZ+ZfjqUHPz7aoGNV+QlsOwCZ00Duil0Y4lAXMY7 Ez1Ytp/Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.1 #2 (Red Hat Linux)) id 1tzEcq-00000000OqJ-3yGH; Mon, 31 Mar 2025 12:52:24 +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 1tzEb9-00000000OXm-2JPf for linux-arm-kernel@bombadil.infradead.org; Mon, 31 Mar 2025 12:50:39 +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=jJMjgcfJtQ3t79N9dIrfR4F9a0xZxCoodgcC2OCf4q0=; b=KrkuiGg2HbSLddEbtLbUmmAZKx Cpzcad/9Dy346GSDiDjlBLzi6nGTxUia3aTtPqHIMq5z+nYrHriiONRnH8/xFFdR8y+dGHnHwtrbd LRez6T4E5ORpnB2CMcc9mBcg72UxZjrbmHKLNUjBnIXbLLSyJckdxS9xSx08MpwaEw5MsSyMWG1sn BNoBanNXEKzdADA7vtjM9aevxxjJEUImRUx4anLBwk2zhwyXbmocIRI95VHRdomlTwLM3GpQEUcal AygbUK+pwG4h36mvSXLs7Jjfxfzi8wlgIkU+r+cEyMLY8ayGeRUszzkUe2Gz4eZCeLCdpQoQDEXf8 2NDKoVlQ==; Received: from [172.31.31.145] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98.1 #2 (Red Hat Linux)) id 1tzEb4-00000006djP-0IVq; Mon, 31 Mar 2025 12:50:34 +0000 Message-ID: <9f33c0b4517eaf5f36c515b92bdcb6170a4a576a.camel@infradead.org> Subject: Re: [PATCH v4 2/4] memblock: update initialization of reserved pages From: David Woodhouse To: Mike Rapoport , Andrew Morton , "Sauerwein, David" Cc: 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: Mon, 31 Mar 2025 13:50:33 +0100 In-Reply-To: <20210511100550.28178-3-rppt@kernel.org> References: <20210511100550.28178-1-rppt@kernel.org> <20210511100550.28178-3-rppt@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ZsEW6//1U010MxvHt2BM" 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 --=-ZsEW6//1U010MxvHt2BM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2021-05-11 at 13:05 +0300, Mike Rapoport wrote: > From: Mike Rapoport >=20 > The struct pages representing a reserved memory region are initialized > using reserve_bootmem_range() function. This function is called for each > reserved region just before the memory is freed from memblock to the budd= y > page allocator. >=20 > The struct pages for MEMBLOCK_NOMAP regions are kept with the default > values set by the memory map initialization which makes it necessary to > have a special treatment for such pages in pfn_valid() and > pfn_valid_within(). >=20 > Split out initialization of the reserved pages to a function with a > meaningful name and treat the MEMBLOCK_NOMAP regions the same way as the > reserved regions and mark struct pages for the NOMAP regions as > PageReserved. >=20 > Signed-off-by: Mike Rapoport > Reviewed-by: David Hildenbrand > Reviewed-by: Anshuman Khandual > --- > =C2=A0include/linux/memblock.h |=C2=A0 4 +++- > =C2=A0mm/memblock.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 | 28 ++++++++++++++++++++++++++-- > =C2=A02 files changed, 29 insertions(+), 3 deletions(-) >=20 > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index 5984fff3f175..1b4c97c151ae 100644 > --- a/include/linux/memblock.h > +++ b/include/linux/memblock.h > @@ -30,7 +30,9 @@ extern unsigned long long max_possible_pfn; > =C2=A0 * @MEMBLOCK_NONE: no special request > =C2=A0 * @MEMBLOCK_HOTPLUG: hotpluggable region > =C2=A0 * @MEMBLOCK_MIRROR: mirrored region > - * @MEMBLOCK_NOMAP: don't add to kernel direct mapping > + * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as > + * reserved in the memory map; refer to memblock_mark_nomap() descriptio= n > + * for further details > =C2=A0 */ > =C2=A0enum memblock_flags { > =C2=A0 MEMBLOCK_NONE =3D 0x0, /* No special request */ > diff --git a/mm/memblock.c b/mm/memblock.c > index afaefa8fc6ab..3abf2c3fea7f 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -906,6 +906,11 @@ int __init_memblock memblock_mark_mirror(phys_addr_t= base, phys_addr_t size) > =C2=A0 * @base: the base phys addr of the region > =C2=A0 * @size: the size of the region > =C2=A0 * > + * The memory regions marked with %MEMBLOCK_NOMAP will not be added to t= he > + * direct mapping of the physical memory. These regions will still be > + * covered by the memory map. The struct page representing NOMAP memory > + * frames in the memory map will be PageReserved() > + * > =C2=A0 * Return: 0 on success, -errno on failure. > =C2=A0 */ > =C2=A0int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr= _t size) > @@ -2002,6 +2007,26 @@ static unsigned long __init __free_memory_core(phy= s_addr_t start, > =C2=A0 return end_pfn - start_pfn; > =C2=A0} > =C2=A0 > +static void __init memmap_init_reserved_pages(void) > +{ > + struct memblock_region *region; > + phys_addr_t start, end; > + u64 i; > + > + /* initialize struct pages for the reserved regions */ > + for_each_reserved_mem_range(i, &start, &end) > + reserve_bootmem_region(start, end); > + > + /* and also treat struct pages for the NOMAP regions as PageReserved */ > + for_each_mem_region(region) { > + if (memblock_is_nomap(region)) { > + start =3D region->base; > + end =3D start + region->size; > + reserve_bootmem_region(start, end); > + } > + } > +} > + In some cases, that whole call to reserve_bootmem_region() may be a no- op because pfn_valid() is not true for *any* address in that range. But reserve_bootmem_region() spends a long time iterating of them all, and eventually doing nothing: void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end, int nid) { unsigned long start_pfn =3D PFN_DOWN(start); unsigned long end_pfn =3D PFN_UP(end); for (; start_pfn < end_pfn; start_pfn++) { if (pfn_valid(start_pfn)) { struct page *page =3D pfn_to_page(start_pfn); init_reserved_page(start_pfn, nid); /* * no need for atomic set_bit because the struct * page is not visible yet so nobody should * access it yet. */ __SetPageReserved(page); } } } On platforms with large NOMAP regions (e.g. which are actually reserved 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 ends up taking a significant amount of time which is visible as guest steal time during the live update. Can reserve_bootmem_region() skip the loop *completely* if no PFN in the range from start to end is valid? Or tweak the loop itself to have an 'else' case which skips to the next valid PFN? Something like for(...) { if (pfn_valid(start_pfn)) { ... } else { start_pfn =3D next_valid_pfn(start_pfn); } } --=-ZsEW6//1U010MxvHt2BM Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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