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See http://www.infradead.org/rpr.html X-Rspamd-Server: rspam01 X-Stat-Signature: zz8w93ucaj8f7zqz8wbbuuamdp9kfxtb X-Rspam-User: X-Rspamd-Queue-Id: A774A140017 X-HE-Tag: 1743434046-528481 X-HE-Meta: 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 XCHci8UM 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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: --=-df4752IuZVlHGwV5MoS6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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: > > > =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 PageReserve= d */ > > > + for_each_mem_region(region) { > > > + if (memblock_is_nomap(region)) { > > > + start =3D region->base; > > > + end =3D start + region->size; > > > + reserve_bootmem_region(start, end); > > > + } > > > + } > > > +} > > > + > >=20 > > 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. > >=20 > > But reserve_bootmem_region() spends a long time iterating of them all, > > and eventually doing nothing: > >=20 > > void __meminit reserve_bootmem_region(phys_addr_t start, > > =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=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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 phys_addr_t end, int nid) > > { > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unsigned long start_pfn =3D = PFN_DOWN(start); > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unsigned long end_pfn =3D PF= N_UP(end); > >=20 > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (; start_pfn < end_pfn; = start_pfn++) { > > =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=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=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 struc= t page *page =3D pfn_to_page(start_pfn); > >=20 > > =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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 init_= reserved_page(start_pfn, nid); > >=20 > > =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=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=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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= * no need for atomic set_bit because the struct > > =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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= * page is not visible yet so nobody should > > =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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= * access it yet. > > =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=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=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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 __Set= PageReserved(page); > > =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=C2=A0 } > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } > > } > >=20 > > 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. > >=20 > > 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 > >=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(start= _pfn); > > =C2=A0=C2=A0=C2=A0 } > > =C2=A0} >=20 > My understanding is that you have large reserved NOMAP ranges that don'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 and > then reserve_bootmem_region() won't even get called, but that would requi= re > firmware to pass that information somehow. I was thinking along these lines (not even build tested)... 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. 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) return pfn >=3D pfn_offset && (pfn - pfn_offset) < max_mapnr; } #define pfn_valid pfn_valid + +static inline unsigned long first_valid_pfn(unsigned long pfn) +{ + /* avoid include hell */ + extern unsigned long max_mapnr; + unsigned long pfn_offset =3D ARCH_PFN_OFFSET; + + if (pfn < pfn_offset) + return pfn_offset; + + if ((pfn - pfn_offset) < max_mapnr) + return pfn; + + return (unsigned long)(-1); +} + +#ifndef for_each_valid_pfn +#define for_each_valid_pfn(pfn, start_pfn, end_pfn) \ + /* Sanity check on the end condition */ \ + BUG_ON(end_pfn =3D=3D (unsigned long)-1); \ + for (pfn =3D first_valid_pfn(pfn); pfn < end_pfn; \ + pfn =3D first_valid_pfn(pfn + 1)) +#endif +#endif + +/* + * If the architecture provides its own pfn_valid(), it can either + * provide a matching for_each_valid_pfn() or use the fallback which + * just iterates over them *all*, calling pfn_valid() for each. + */ +#ifndef for_each_valid_pfn +#define for_each_valid_pfn(pfn, start_pfn, end_pfn) \ + for (pfn =3D start_pfn; pfn < end_pfn, pfn++) { \ + if (pfn_valid(pfn)) #endif =20 + #elif defined(CONFIG_SPARSEMEM_VMEMMAP) =20 /* memmap is virtually contiguous. */ --=-df4752IuZVlHGwV5MoS6 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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