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b=pd6Fx84Y6z8Cpgkgd7q8RCCK3aWSsBk8fMMjUYDOw2JqtG25U0kslC1mykBlkXFoLIuuU3NGLB+1YAjKA6wp4bpHtUihJWNWfmtFkZt24BMwJVUDhr0k297RfO7Lakk/+uiM09YbWVIiX7amUm1OzaoanZzN5vJ5qksu1yHohcE= Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; Received: from AM9PR08MB7120.eurprd08.prod.outlook.com (2603:10a6:20b:3dc::22) by DB9PR08MB8357.eurprd08.prod.outlook.com (2603:10a6:10:3db::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8901.20; Thu, 3 Jul 2025 14:44:39 +0000 Received: from AM9PR08MB7120.eurprd08.prod.outlook.com ([fe80::2933:29aa:2693:d12e]) by AM9PR08MB7120.eurprd08.prod.outlook.com ([fe80::2933:29aa:2693:d12e%3]) with mapi id 15.20.8901.021; Thu, 3 Jul 2025 14:44:39 +0000 Message-ID: <48b7cc42-e5b9-4103-85f2-7a33543329a9@arm.com> Date: Thu, 3 Jul 2025 20:14:33 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/7] selftests/mm: Add support to test 4PB VA on PPC64 To: Zi Yan , Aboorva Devarajan Cc: akpm@linux-foundation.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, shuah@kernel.org, pfalcato@suse.de, david@redhat.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, baohua@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, donettom@linux.ibm.com, ritesh.list@gmail.com References: <20250703060656.54345-1-aboorvad@linux.ibm.com> <20250703060656.54345-3-aboorvad@linux.ibm.com> <5FA05361-1FA8-4CAA-AF23-7BB0974DA78B@nvidia.com> Content-Language: en-US From: Dev Jain In-Reply-To: <5FA05361-1FA8-4CAA-AF23-7BB0974DA78B@nvidia.com> Content-Type: text/plain; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Jul 2025 14:45:11.9663 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 42826047-5a43-4354-2c14-08ddba40370a X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF00000191.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB6436 On 03/07/25 8:11 pm, Zi Yan wrote: > On 3 Jul 2025, at 2:06, Aboorva Devarajan wrote: > >> From: Donet Tom >> >> PowerPC64 supports a 4PB virtual address space, but this test was >> previously limited to 512TB. This patch extends the coverage up to >> the full 4PB VA range on PowerPC64. >> >> Memory from 0 to 128TB is allocated without an address hint, while >> allocations from 128TB to 4PB use a hint address. >> >> Signed-off-by: Donet Tom >> Signed-off-by: Aboorva Devarajan >> --- >> tools/testing/selftests/mm/virtual_address_range.c | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/tools/testing/selftests/mm/virtual_address_range.c b/tools/testing/selftests/mm/virtual_address_range.c >> index e24c36a39f22..619acf0b9239 100644 >> --- a/tools/testing/selftests/mm/virtual_address_range.c >> +++ b/tools/testing/selftests/mm/virtual_address_range.c >> @@ -50,6 +50,7 @@ >> #define NR_CHUNKS_256TB (NR_CHUNKS_128TB * 2UL) >> #define NR_CHUNKS_384TB (NR_CHUNKS_128TB * 3UL) >> #define NR_CHUNKS_3840TB (NR_CHUNKS_128TB * 30UL) >> +#define NR_CHUNKS_3968TB (NR_CHUNKS_128TB * 31UL) >> >> #define ADDR_MARK_128TB (1UL << 47) /* First address beyond 128TB */ >> #define ADDR_MARK_256TB (1UL << 48) /* First address beyond 256TB */ >> @@ -59,6 +60,11 @@ >> #define HIGH_ADDR_SHIFT 49 >> #define NR_CHUNKS_LOW NR_CHUNKS_256TB >> #define NR_CHUNKS_HIGH NR_CHUNKS_3840TB >> +#elif defined(__PPC64__) >> +#define HIGH_ADDR_MARK ADDR_MARK_128TB >> +#define HIGH_ADDR_SHIFT 48 >> +#define NR_CHUNKS_LOW NR_CHUNKS_128TB >> +#define NR_CHUNKS_HIGH NR_CHUNKS_3968TB >> #else >> #define HIGH_ADDR_MARK ADDR_MARK_128TB >> #define HIGH_ADDR_SHIFT 48 > Could you also update the comment above this code to say PowerPC64 also > supports 4PB virtual address space? > > From the comment, arm64 supports 4PB but its NR_CHUNKS_HIGH is only 3840TB, > whereas PowerPC64 here can get to 3968TB. I do not know why arm64’s > 4PB is smaller. ;) The border for high VA space is 128 TB for x86 and ppc, for arm64 it is 256 TB. > > Otherwise, the patch looks good to me. > > Reviewed-by: Zi Yan > > Best Regards, > Yan, Zi