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See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 98B9A180007 X-Stat-Signature: sh8d4cceu18deb9uupjebnzx8wngc98s X-HE-Tag: 1743425446-692014 X-HE-Meta: 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 cYg72GxN 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --=-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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