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a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=rtQ0uXEcNbIqAMr9pJsA:9 a=QEXdDO2ut3YA:10 a=K9ePon4BgHcA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI0MDE1NiBTYWx0ZWRfX8QoMN9Pg+DWb sBew8Bt2KI10ExFkaLRJiuH4XH725i7E8bXR4+jhr+JGs+yRVGSg+cXoJ9rP3Ea+zP3Jj7tYSdg z2C6FN/xzZWVCakMl4lVrJVBRuOIRHa+12ts+Dr9LRhgLFk7FvVLUtROC/PavjwvURXhmPQcoze 4AsEPsPVucGdPEKEsIz7CtNfJCYdVgJv0LVTL2acvvjetA8gal2k8/O4Agp0ugzy2xXKDmXeyt/ Kheml4d7WRv1SPPFLns9IXENKyTC6Fk+0Uo9iiNhIIaNmfP/vkQ8sXORR2nb0Pw8NKdbnEdhQo8 d//lteQ5Yh3GrDQtMUjcJgz1iEBvTw4P/JbC47cxwFUmx7ZyRD8T3B69TSzXDUTPKT4XQuQzfIO nIvxfnAnSXu9x1qOfdMejJf4RpQS5w== On 11/24/2025 9:27 AM, Greg KH wrote: > On Mon, Nov 24, 2025 at 09:06:21AM -0800, jane.chu@oracle.com wrote: >> Hi, Greg, >> >> On 11/24/2025 8:17 AM, Greg KH wrote: >>> On Tue, Nov 11, 2025 at 01:26:06PM -0700, Jane Chu wrote: >>>> On an ARM64 A1 system, it's possible to have physical memory span >>>> up to the 64T boundary, like below >>>> >>>> $ lsmem -b -r -n -o range,size >>>> 0x0000000080000000-0x00000000bfffffff 1073741824 >>>> 0x0000080000000000-0x000008007fffffff 2147483648 >>>> 0x00000800c0000000-0x0000087fffffffff 546534588416 >>>> 0x0000400000000000-0x00004000bfffffff 3221225472 >>>> 0x0000400100000000-0x0000407fffffffff 545460846592 >>>> >>>> So it's time to extend /sys/kernel/mm/page_idle/bitmap to be able >>>> to account for >2G number of pages, by raising the kernfs file size >>>> limit. >>> >>> Wait, we are having sysfs files that are bigger than >2G? Which files >>> exactly? >> >> This file: /sys/kernel/mm/page_idle/bitmap >> that tracks idle pages, 1 bit per page. > > Why is that a sysfs file and not a debugfs file? The bitmap file was introduced by 33c3fc71c8cf "(mm: introduce idle page tracking)" for idle page tracking. See also https://docs.kernel.org/admin-guide/mm/idle_page_tracking.html > >> Because of the above memory span, so even though the system has < 64TiB >> memory, we still need to be able to seek beyond the 2GiB point in the >> /sys/kernel/mm/page_idle/bitmap file. > > What uses this file? It's not on my systems, what arch uses it? Our use case is for production, not for debug purpose. The file is on my dual-socket Intel Ice Lake system w/ Linux v6.12.x, the issue was originally reported on an ARM64 A1 system. thanks, -jane > > thanks, > > greg k-h