On 4/29/21 3:32 PM, Song Bao Hua (Barry Song) wrote: > $ strace numactl --hardware 2>&1 | grep cpu > openat(AT_FDCWD, "/sys/devices/system/cpu", > O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 > openat(AT_FDCWD, "/sys/devices/system/node/node0/cpumap", O_RDONLY) = 3 > openat(AT_FDCWD, "/sys/devices/system/node/node1/cpumap", O_RDONLY) = 3 > openat(AT_FDCWD, "/sys/devices/system/node/node2/cpumap", O_RDONLY) = 3 > openat(AT_FDCWD, "/sys/devices/system/node/node3/cpumap", O_RDONLY) = 3 > > If we move to binary, it means we have to change those applications. I thought Greg was saying to using a sysfs binary attribute using something like like sysfs_create_bin_file(). Those don't have the PAGE_SIZE limitation. But, there's also nothing to keep us from spewing nice human-readable text via the "binary" file. We don't need to change the file format, just the internal kernel API that we produce the files with.
