• Martin Schwidefsky's avatar
    s390/fpu: allocate 'struct fpu' with the task_struct · 3f6813b9
    Martin Schwidefsky authored
    Analog to git commit 0c8c0f03
    "x86/fpu, sched: Dynamically allocate 'struct fpu'"
    move the struct fpu to the end of the struct thread_struct,
    set CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and add the
    setup_task_size() function to calculate the correct size
    fo the task struct.
    
    For the performance_defconfig this increases the size of
    struct task_struct from 7424 bytes to 7936 bytes (MACHINE_HAS_VX==1)
    or 7552 bytes (MACHINE_HAS_VX==0). The dynamic allocation of the
    struct fpu is removed. The slab cache uses an 8KB block for the
    task struct in all cases, there is enough room for the struct fpu.
    For MACHINE_HAS_VX==1 each task now needs 512 bytes less memory.
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    3f6813b9
setup.c 24.3 KB