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X-Proofpoint-ORIG-GUID: vWnfrPLMkjbHY7Fw7txS0GsNEpHT-bAz X-Proofpoint-GUID: vWnfrPLMkjbHY7Fw7txS0GsNEpHT-bAz 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. 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. without fix: -------------- 2 Gb $ sudo dd if=/sys/kernel/mm/page_idle/bitmap of=/dev/null bs=8 skip=$((2*1024*1024*1024/8)) count=1 dd: /sys/kernel/mm/page_idle/bitmap: cannot skip: Invalid argument <-- 0+0 records in 0+0 records out 0 bytes copied, 0.00017564 s, 0.0 kB/s <-- with fix: ------------ 2 Gb $ sudo dd if=/sys/kernel/mm/page_idle/bitmap of=/dev/null bs=8 skip=$((2*1024*1024*1024/8)) count=1 dd: /sys/kernel/mm/page_idle/bitmap: cannot skip to specified offset <-- ignore 1+0 records in 1+0 records out 8 bytes copied, 0.000165122 s, 48.4 kB/s <-- thanks, -jane > >> Signed-off-by: Jane Chu >> --- >> fs/kernfs/mount.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c >> index 76eaf64b9d9e..3ac52e141766 100644 >> --- a/fs/kernfs/mount.c >> +++ b/fs/kernfs/mount.c >> @@ -298,6 +298,7 @@ static int kernfs_fill_super(struct super_block *sb, struct kernfs_fs_context *k >> if (info->root->flags & KERNFS_ROOT_SUPPORT_EXPORTOP) >> sb->s_export_op = &kernfs_export_ops; >> sb->s_time_gran = 1; >> + sb->s_maxbytes = MAX_LFS_FILESIZE; > > What is the default setting for s_maxbytes today? > > thanks, > > greg k-h