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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jan 2024 03:32:50.6654 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f116e1f9-95d5-4f1b-d98d-08dc1255fd1b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9D7.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6812 X-Rspamd-Queue-Id: 51AE94001B X-Rspam-User: X-Stat-Signature: p4x6fy63g9eafh6ese6gh9oa4dw49xqf X-Rspamd-Server: rspam03 X-HE-Tag: 1704943975-909843 X-HE-Meta: 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 /bwLfHVw ox+7rWfFo9+OArxmf0xevlmIHViS2xVCXC6zJrMXNmmr8WN+QkStu3KfqUCg9S5B4mHxM84/fkEXsudK0PtmwXR3wImnVJUcowCqq9jVtGePkBqqkcybBTFCevOrRpf9yF5C3RRKQ2nFRofEo4MSlgskJwsELUXXaVYTaq7bnq6mC52xXW2P2eWsU0F9EnzfCmFTB/9chmoLyCaRqPkxT4K2zEl1eMuI0aLtN8uZ3wXeejQcVuIyb+wCsxVba78Gnji+7stPzYuGsm2LXELOmzHTLRP7ROsjs5lsQneNi106mqVkKJiArntVNOJ3IviZL75l2R+861CGsE37OC755zwY3zKFhCS08+CbiS1GbXCn/K7LwBjCB6s0YCrb93VixTDvt 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: On 1/10/24 16:11, John Hubbard wrote: > On 1/10/24 3:21 PM, John Hubbard wrote: > ... >> 2) On an mTHP kernel with the latest patchsets (arm64, 64K page size), I >> *think* I cannot turn off mTHP. I'm still teasing apart how much of this >> is an instrumentation error, and how much is a measurement problem (with >> the test suite). And maybe I'm wrong entirely. But the "never" option >> doesn't seem to have an effect. Unless the latest version of the testsuite >> is doing something new, sigh. > > OK, it turns out that the test suite changed over to use hugetlbfs > on this version. So the performance remained high, with or without > THP settings. heh. Please disregard this part. :) > ...although, this does turn out to be informative with respect to thpmap. Because, look at this case: Container app does this: umount /dev/shm mount -t tmpfs tmpfs -o huge=always /dev/shm; findmnt /dev/shm ...and then monitoring it: # ./thpmaps --cgroup /sys/fs/cgroup --cont 128K --cont 512K --cont 1M \ --cont 2M --cont 512M --summary file-thp-aligned-524288kB: 105906176 kB (97%) file-thp-partial: 1415680 kB ( 1%) file-cont-aligned-128kB: 107321600 kB (99%) file-cont-aligned-512kB: 106886656 kB (98%) file-cont-aligned-1024kB: 106886144 kB (98%) file-cont-aligned-2048kB: 106883072 kB (98%) file-cont-aligned-524288kB: 105906176 kB (97%) So what I'm trying to say here is, it is still difficult to tell what's going on. In particular, hugetlbfs vs. [m]THP is not yet clear. thanks, -- John Hubbard NVIDIA